London is set to host the 2026 TCS London Marathon on Sunday with around 59,000 runners expected to start from Blackheath under dry and pleasant spring weather. The Met Office predicts warm temperatures reaching up to 19C in the capital, providing near-ideal conditions ahead of anticipated rain and thunderstorms arriving on Monday across southern England and the Midlands.
Sunshine Boost For Runners
The marathon day will be mostly dry and bright, with a cool start and mild temperatures rising through the morning. Runners are advised to prepare for a cool wait on the start line at Greenwich Park and Blackheath, with highs forecast between 17C and 19C. The Met Office highlights light winds and low rain risk, creating favourable running conditions on the largely shadeless city course.
Uv And Pollen Warnings
Despite comfortable temperatures, runners should be aware of high UV levels and a significant oak pollen count across southern England, particularly in London. Allergy sufferers are advised to take precautions such as antihistamines and keep windows shut overnight to minimise symptoms.
Notable Competitors Set To Appear
The race features a strong field, including Sir Mo Farah’s return to the event alongside rugby star Ellie Kildunne. Celebrity runners like Jack O’Connell, James Norton, and Harry Judd add to the appeal. Marcel Hug aims to equal David Weir’s record in the men’s wheelchair race, while Catherine Debrunner seeks to challenge the women’s wheelchair times.
Race Day Timeline
- Elite wheelchair start: 8:50am
- Elite women start: 9:05am
- Elite men and mass start from: 9:35am
- The wave starts to conclude around 11:30am
The route travels from Greenwich Park through key landmarks such as Tower Bridge, Canary Wharf, and ends on The Mall.
Weekend Weather Contrast
While Sunday offers refreshing spring weather ideal for competitors and spectators, a sharp shift is expected on Monday when heavy rain and potential thunderstorms will affect central southern England and the Midlands, ending the weekend’s dry spell.
