The weather forecast for the London Marathon 2026, the pollen levels and what it is the best weather for running?

The London Marathon is back for another year, and over 59,000 people are expected on the start line this weekend.

First came the news that next year’s event could be a two-day behemoth, with an estimated 100,000 runners set to take on the course across Saturday 25 and Sunday 25 April 2027.