Europe London Marathon weather forecast spells good news for runners as three give predictions for April 21 The forecasters generally agree though some predict a gloomier day than others My London – WeatherRead More About Author See author's posts Post navigation Previous Watching This…Next How Deep Was Death Valley’s Temporary Lake? Related Stories London warning of ‘extreme’ wildfire risk this weekend as 31C heatwave continues All Regions Europe London warning of ‘extreme’ wildfire risk this weekend as 31C heatwave continues July 10, 2026 Exact dates BBC Weather experts are forecasting 3 days of London thunderstorms after heatwave All Regions Europe Exact dates BBC Weather experts are forecasting 3 days of London thunderstorms after heatwave July 10, 2026 UK heatwave to last longer than expected as Met Office reveals when London will cool down slightly All Regions Europe UK heatwave to last longer than expected as Met Office reveals when London will cool down slightly July 9, 2026