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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the DailyCity weather desk. Data from national met services via Open-Meteo.
London is experiencing a heatwave from today, with temperatures set to reach 32°C in central areas, peaking on Thursday before a thundery breakdown arrives from the west by Friday evening.
How hot will it get and when will it break?
For London and the Home Counties, the hottest day is expected on Thursday, with the mercury climbing to 32–34°C in the City and suburbs like Richmond and Croydon. This meets the Met Office definition of a heatwave for the region – three consecutive days above 28°C. A cold front then pushes in from the Atlantic on Friday, bringing a 60% chance of heavy, thundery downpours across the capital and a sharp drop to around 22°C by Saturday.
What health warnings should Londoners follow?
The UK Health Security Agency has issued a yellow heat-health alert for London from midday Wednesday until Friday. The main risks are dehydration and heat exhaustion for those under 65 and serious complications for older or vulnerable people. Keep homes cool by closing curtains on sun-facing windows during the day, avoid strenuous outdoor activity between 11am and 3pm, and check on elderly neighbours.
Is this a heatwave uk 2025 event?
Yes, this is the first named heatwave uk event of summer 2025 for London and the South East. The Met Office confirmed the heatwave criteria are likely to be met from Wednesday to Friday.
Will the heatwave london today affect transport?
Yes. TfL issues speed restrictions on the Tube and Overground when rails exceed 40°C, causing delays. Also avoid parking on grass verges to prevent fire risk.
Are there heatwave london 2026 predictions yet?
Very early. Long-range models suggest a 20–30% chance of a hotter-than-average summer in the capital next year, but accurate predictions only emerge closer to the season.
Sources
For the full outlook across the rest of Britain, check the UK weather hub and the dedicated Weather Forecast Heatwave Uk page. If you are travelling, the 10 Day Weather Forecast UK covers the capital and northern regions.