Heatwave London
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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Leeds Wire weather desk. Data from national met services via Open-Meteo.
London is set for a prolonged heatwave starting this week, with temperatures expected to peak at 33°C by Friday. The Met Office has issued a level 3 heat-health alert, meaning you should take action to protect yourself and check on vulnerable neighbours.
How long will the London heatwave last?
The current heatwave uk is forecast to last from Wednesday through Sunday, with the hottest day expected on Friday. Nighttime temperatures will stay above 20°C in central London, offering little relief. A moderate Rainfall Warning has been issued for Monday as cooler, unsettled weather moves in from the Atlantic. Looking further ahead, early uk heatwave 2026 predictions suggest a similar pattern of brief but intense summer hot spells.
How to stay safe during a London heatwave 2025
Keep indoor spaces cool by closing curtains during the day and opening windows at night. Drink plenty of water, avoid alcohol, and check on elderly relatives. The NHS advises staying out of direct sun between 11am and 3pm. Never leave children or pets in parked cars. For a fuller breakdown, see our Weather Forecast Heatwave Uk guide. If you live in a top-floor flat, consider spending time in a shaded park or public building with air conditioning.
Is a heatwave london today expected to break records?
No. While 33°C is unusually high for June, it is unlikely to break the London record of 37.9°C. However, the combination of high humidity and warm nights makes this heatwave more dangerous than a dry one for vulnerable people.
When might the next uk heatwave 2026 arrive?
Long-range forecasts are unreliable this far ahead, but early uk heatwave 2026 predictions suggest a higher-than-average chance of warm spells in June and July. Visit our uk weather hub for updates as we get closer.
Will there be a heatwave uk next week after this one ends?
Current models show a return to near-average temperatures early next week, with cooler and fresher conditions arriving by Monday. No immediate sign of another heatwave uk next week, but the outlook remains changeable for late June.
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