Sydenham (County Antrim) weather
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Forecast days
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Today. Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Heavy rain changing to cloudy by early evening. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.Today. Maximum daytime temperature: 19 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Heavy rain changing to cloudy by early evening. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.
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Friday 17 May. Maximum daytime temperature: 18 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Sunny intervals changing to cloudy by lunchtime. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.Friday 17 May. Maximum daytime temperature: 18 degrees Celsius; Minimum nighttime temperature: 12 degrees Celsius. Sunny intervals changing to cloudy by lunchtime. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.
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Saturday 18 May. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Cloudy changing to sunny intervals in the afternoon. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.Saturday 18 May. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 9 degrees Celsius. Cloudy changing to sunny intervals in the afternoon. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.
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Sunday 19 May. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius. Sunny. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.Sunday 19 May. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius. Sunny. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.
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Monday 20 May. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 11 degrees Celsius. Sunny intervals changing to overcast by late morning. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.Monday 20 May. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 11 degrees Celsius. Sunny intervals changing to overcast by late morning. Sunrise: ; Sunset: . UV: High; Pollution: Low; Pollen: Low.
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Tuesday 21 May. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius. Sunny changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Moderate;Tuesday 21 May. Maximum daytime temperature: 16 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius. Sunny changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Moderate;
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Wednesday 22 May. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius. Sunny changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Moderate;Wednesday 22 May. Maximum daytime temperature: 15 degrees Celsius; Minimum nighttime temperature: 10 degrees Celsius. Sunny changing to cloudy by late morning. Sunrise: ; Sunset: . UV: Moderate;
Seven day forecast for Sydenham
| Time | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | 20:00 | 21:00 | 22:00 | 23:00 |
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| Weather symbols |
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Chance of precipitation
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10% | 50% | 70% | 10% | <5% | <5% | <5% | <5% | <5% |
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18°
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17°
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17°
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17°
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17°
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17°
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17°
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16°
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16°
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15° | 15° | 15° | 16° | 16° | 16° | 15° | 15° | 14° |
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NE
14
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NE
11
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NNE
10
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NNE
9
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N
10
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N
9
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NNW
10
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NNW
10
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N
12
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21 | 18 | 16 | 16 | 17 | 16 | 17 | 18 | 21 |
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G | G | G | G | G | G | G | G | G |
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Humidity
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70% | 73% | 75% | 75% | 75% | 75% | 76% | 78% | 81% |
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UV
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5 | 4 | 3 | 2 | 1 | 1 | 1 | - | - |
| Time | 00:00 | 01:00 | 02:00 | 03:00 | 04:00 | 05:00 | 06:00 | 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | 20:00 | 21:00 | 22:00 | 23:00 |
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| Weather symbols |
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Chance of precipitation
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<5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | 10% | <5% | 30% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% |
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14°
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13°
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13°
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12°
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12°
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12°
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12°
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12°
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13°
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13°
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14°
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14°
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15°
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16°
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16°
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16°
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17°
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17°
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17°
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17°
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17°
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16°
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15°
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15°
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12° | 11° | 10° | 10° | 10° | 10° | 10° | 10° | 11° | 11° | 12° | 13° | 13° | 14° | 15° | 15° | 16° | 17° | 16° | 16° | 16° | 16° | 15° | 14° |
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NNE
13
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NNE
13
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NNE
11
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NNE
11
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NNE
11
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NNE
11
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NNE
10
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NNE
10
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NNE
9
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NNE
10
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NNE
10
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NNE
9
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NNE
10
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NNE
9
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NE
8
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NE
8
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NE
7
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NNE
6
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NNE
7
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NNE
7
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NNE
7
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NE
4
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NNW
6
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NNW
6
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23 | 21 | 19 | 18 | 18 | 17 | 17 | 16 | 16 | 17 | 16 | 14 | 16 | 15 | 14 | 13 | 12 | 10 | 11 | 12 | 11 | 9 | 10 | 10 |
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G | VG | VG | G | G | G | G | G | G | G | G | G | G | G | G | G | G | VG | VG | VG | VG | G | G | G |
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Humidity
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83% | 85% | 88% | 88% | 90% | 90% | 90% | 88% | 85% | 83% | 83% | 81% | 79% | 75% | 73% | 72% | 71% | 71% | 70% | 71% | 73% | 78% | 80% | 82% |
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UV
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- | - | - | - | - | - | 1 | 1 | 2 | 3 | 4 | 4 | 5 | 6 | 5 | 5 | 4 | 3 | 2 | 1 | 1 | 1 | - | - |
| Time | 00:00 | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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<5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% |
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14°
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14°
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13°
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13°
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15°
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17°
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17°
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15°
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11°
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13° | 13° | 12° | 11° | 13° | 15° | 15° | 12° | 9° |
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NW
6
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NNW
6
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NW
7
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NNW
7
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NNW
11
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NNW
12
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NNW
12
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NNW
12
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NW
10
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10 | 10 | 12 | 13 | 17 | 19 | 20 | 20 | 16 |
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G | G | M | G | G | VG | VG | VG | VG |
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Humidity
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84% | 83% | 89% | 88% | 78% | 70% | 67% | 73% | 80% |
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UV
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- | - | - | 1 | 3 | 6 | 4 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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<5% | <5% | <5% | <5% | <5% | <5% | <5% | <5% |
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10°
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10°
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11°
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14°
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15°
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16°
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15°
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13°
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8° | 8° | 9° | 12° | 14° | 14° | 14° | 12° |
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NNW
8
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NNW
8
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NNW
7
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N
9
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NNE
9
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NNE
9
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NNE
8
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NNE
6
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13 | 12 | 12 | 16 | 17 | 16 | 14 | 10 |
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VG | VG | VG | VG | VG | VG | VG | VG |
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Humidity
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83% | 85% | 84% | 76% | 71% | 69% | 72% | 82% |
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UV
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- | - | 1 | 4 | 6 | 4 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
|
<5% | <5% | <5% | 10% | <5% | <5% | <5% | <5% |
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11°
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11°
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12°
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14°
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15°
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16°
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15°
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13°
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10° | 10° | 11° | 12° | 14° | 15° | 14° | 12° |
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NNE
5
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NNE
5
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ENE
6
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E
8
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ESE
8
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SE
8
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SE
7
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SE
5
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9 | 9 | 11 | 14 | 16 | 15 | 13 | 8 |
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VG | VG | G | VG | VG | VG | VG | VG |
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Humidity
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86% | 88% | 88% | 80% | 74% | 71% | 72% | 84% |
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UV
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- | - | 1 | 3 | 6 | 4 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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<5% | 10% | 10% | 10% | 10% | 10% | 10% | 10% |
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12°
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11°
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12°
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14°
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15°
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15°
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14°
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12°
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11° | 10° | 11° | 13° | 14° | 14° | 13° | 11° |
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SE
5
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SE
5
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SE
5
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SSE
8
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SE
9
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SE
9
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SE
8
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S
6
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9 | 9 | 10 | 14 | 16 | 17 | 14 | 10 |
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VG | G | G | VG | VG | VG | VG | VG |
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Humidity
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88% | 91% | 88% | 78% | 73% | 71% | 72% | 82% |
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UV
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- | - | 1 | 3 | 5 | 4 | 1 | - |
| Time | 01:00 | 04:00 | 07:00 | 10:00 | 13:00 | 16:00 | 19:00 | 22:00 |
|---|---|---|---|---|---|---|---|---|
| Weather symbols |
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Chance of precipitation
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10% | 10% | 10% | 10% | 10% | 30% | 30% | 30% |
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11°
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11°
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11°
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12°
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13°
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13°
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13°
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12°
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10° | 9° | 9° | 10° | 11° | 11° | 11° | 10° |
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W
7
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NW
7
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NW
8
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NNE
9
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N
11
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W
11
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NNW
11
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WNW
10
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11 | 12 | 14 | 17 | 19 | 20 | 20 | 18 |
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VG | G | G | G | G | VG | VG | G |
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Humidity
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85% | 85% | 84% | 76% | 69% | 69% | 69% | 77% |
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UV
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- | - | 1 | 3 | 4 | 3 | 2 | - |
Our weather symbols tell you the weather conditions for any given hour in the day or night. This means that the symbol for 9am shows you what you will see from 9am to 10am.
Chance of precipitation represents how likely it is that rain (or other types of precipitation, such as sleet, snow, hail or drizzle) will fall from the sky at a certain time.
This number shows the air temperature for the time period. You can see the temperature in Celsius or Fahrenheit by using the dropdown menu.
Feels like temperature considers other factors, such as wind speed and humidity. This gives you a better idea of how the temperature will actually feel at the time.
Wind gust shows the highest wind speed that you should encounter at that time, as winds peak and lull.
Strong winds are shown in bold for speeds of 29 mph or more.
The arrow shows the direction the wind is blowing. The letters show the direction the wind is blowing from (on a standard 16-point compass).
The number represents the average wind speed expected at that time.
The arrow shows the direction of the wind (up is north). If the arrow points from land to sea, the wind will be blowing out to sea (‘offshore’). The number is the average wind speed.
Beware of offshore winds if you are using inflatables, paddle boards or kayaks. These winds can blow you out to sea. Read more about how wind will affect you at the beach.
Visibility measures the distance at which an object can be clearly seen.
| VP (Very Poor) | Less than 1 km |
| P (Poor) | 1.1 km to 4 km |
| M (Moderate) | 4.1 km to 10 km |
| G (Good) | 10.1 km to 20 km |
| VG (Very Good) | 20.1 km to 40 km |
| E (Excellent) | Greater than 40 km |
Humidity is the amount of water vapor in the air. If there is a lot of water vapour, the humidity will be high. The higher the percentage of humidity, the wetter it will feel outside.
UV exposure index and the protection required to help keep you safe:
No risk of UV - It’s safe to stay outside. Low - You can safely stay outside. Consider sunscreen in direct sunlight. Moderate - Take care during midday hours and do not spend too much time in the sun unprotected. Sunscreen advised. High - Seek shade during midday hours, cover up and wear sunscreen. Very high - Spend time in the shade between 11am and 3pm. Shirt, sunscreen and hat are essential. Extreme - Avoid being outside during midday hours. Shirt, sunscreen and hat essential.
This is the average height of the waves, 1-2 miles out to sea. The height of the waves can vary. The individual waves out to sea or at the beach can be higher than this number. If you are close to the water, keep an eye on the waves to stop you or your belongings being swept away.
Read more about calculating the expected height of the waves at the beach.
This is the average number of seconds between one wave and the next, 1-2 miles out to sea. A long wave period (more than 10 seconds) means the waves at the beach may be more powerful. Lifeguards can give you advice on waves if you’re planning to go into the water.
Read more about the period of waves.
The arrow shows the average direction of the waves 1-2 miles out to sea. It indicates how sheltered the beach will be from these waves. If the arrow points towards land, most of the waves’ power will reach the beach. If the arrow is parallel to or pointing away from land, the wave height is likely to be lower on the beach than it is offshore.
Lifeguards can give you advice on waves if you’re planning to go into the water.
Forecast row information
UK video forecast
Northern Ireland weather forecast
Headline:
Bright and warm with a few afternoon showers.
Today:
Any fog and low cloud burning off this morning. Then sunny intervals with a few showers breaking out this afternoon, these mainly across southern counties. Warm. Maximum temperature 21 °C.
Tonight:
Any showers dying out this evening. Then the rest of the night will be dry with variable amounts of cloud. Low cloud and fog developing in the early hours. Minimum temperature 10 °C.
Friday:
Mainly dry and rather cloudy, some brightness possible in the north. Chance of an afternoon shower across the south. Mist may affect the coastal north later. Maximum temperature 18 °C.
Outlook for Saturday to Monday:
A mainly dry few days with some bright or sunny intervals. Overnight mist and low cloud. Warm in the east.
Updated:
UK long range weather forecast
There is a lot of uncertainty in this period, even at the start when the UK will be in-between low pressure over the near continent trying to keep things unsettled and potentially thundery; high pressure to the west or southwest which would settle things down; and finally low pressure to the north or northwest which may being a more climatological split in conditions between the south and north. Overall though, one way or another, it looks like remaining fairly unsettled across much of the UK, with further rain, showers or even thunderstorms in places, though there will be some sunshine between times, the best of this possibly in southwestern parts. Both rainfall amounts and temperatures are likely to be a little above average, but some large spatial differences are likely.
Updated:
There is nothing to suggest that conditions will be massively different to climatology at the end of the current month and though the first half of June. That said, both temperatures and rainfall are more-likely to be a little above average overall, with a fairly mixed bag seemingly most probable, with further rain or showers (possibly heavy/thundery at times) but also some spells of increasingly warm sunshine when it's not raining.
Updated:
