The 2026 London Marathon is set for Sunday, April 26, and the weather forecast looks favorable for runners and spectators alike. After months of training, participants can expect dry conditions with mild temperatures and minimal wind.
When is the 2026 London Marathon?
The race takes place on Sunday, April 26, with non-elite runners starting from approximately 9:30 AM.
Weather Forecast for the 2026 London Marathon
According to the Met Office, there is less than a five percent chance of precipitation, meaning rain is unlikely. At the 9 AM start, temperatures will be around 11°C, rising to a peak of 17°C in the afternoon. While 17°C is on the warmer side for marathon running, it remains manageable with proper hydration. Cloud cover is expected early (before 9 AM) and late (after 2 PM), but overall conditions will be mostly sunny. Winds will be light at about 7 mph, blowing east-to-west.
Will it be too hot?
Temperatures will start at 9°C as runners arrive and peak at 17°C between 2 PM and 5 PM. Runners should stay hydrated and pace themselves accordingly.
Will it rain?
No. Sunday is forecast to be dry, so no slippery surfaces or drenched crowds.
What is the best weather for running a marathon?
The ideal marathon weather varies per runner, but generally, dry conditions with little wind and temperatures between 7°C and 15°C are considered optimal. Sunday's forecast falls within this range, making it a good day for a personal best.
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