With this year’s London Marathon set to take place on Sunday, April 27, the weather for the event is looking like it will favour spectators over runners.
Whether you’ll be participating in the marathon or supporting loved ones from the sidelines, here’s what you can expect from the day’s weather.
As the day begins, runners will be greeted with a fresh and cool morning. Temperatures are anticipated to be around 10°C to 11°C, ideal for those early morning preparations and warm-ups. This cooler start should provide a comfortable beginning for the runners.
Making weekend plans that involve being outside?
— Met Office (@metoffice) April 25, 2025
Find out if the weather will play ball in the latest forecast 👇 pic.twitter.com/ROz6B2WoBB
As the marathon progresses, the weather is expected to remain mostly fine and dry. While there will be some cloud cover, sunny spells are likely to break through, gradually increasing the temperatures. By midday, temperatures are expected to reach between 18°C and 19°C and will continue to creep up into the afternoon.
In the afternoon, temperatures are forecasted to peak at around 22°C to 23°C. This warmer weather will be enjoyable for spectators, but runners should be prepared for the heat. It is advisable to stay hydrated and consider applying sunscreen to protect against the sun.
Alex Deakin, Met Office presenter and meteorologist, said: “The 2025 London Marathon definitely looks better for the spectators because it is going to be getting quite warm by Sunday afternoon.
“First thing Sunday morning as you're waiting for the start It'll be quite fresh quite cool by the time the start gets underway. Temperatures probably 10°C or 11°C.
“Most of the day will be fine weatherwise, there'll be some cloud but there will also be some sunny spells coming through and those sunny spells are likely to lift the temperatures through the morning So that by around midday we'll be looking at temperatures in the high teens 18°C or 19°C
“The winds are going to be fairly light but those temperatures will continue to tick up as we go through the afternoon probably peaking around the middle of the afternoon at 22°C maybe even 23°C.”
READ MORE: Manchester Marathon 2025: What to expect from the weather
Marathon records
The London Marathon has experienced a wide range of weather conditions over the years. The highest recorded temperature was 24.2°C in 2018, while the lowest was -1.9°C in 1991. Additionally, the marathon has seen significant rainfall, with 22.6mm recorded in 1983, and wind gusts reaching up to 35mph in 1986. This year, however, appears to be leaning towards warmer and drier conditions.
Whether you are running or cheering, this year’s London Marathon looks set to be one of the warmer marathons on record, so prepare accordingly.
Keep up to date with weather warnings, and you can find the latest forecast on our website, on YouTube, by following us on X and Facebook, as well as on our mobile app which is available for iPhone from the App store and for Android from the Google Play store.