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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the BritainNow weather desk. Data from national met services via Open-Meteo.
London is not currently in a heatwave, but temperatures are forecast to climb to 28–30°C by mid-week, which would meet the Met Office heatwave threshold for the capital. Any prolonged hot spell would likely last three to four days before cooler Atlantic air arrives.
When will the next heatwave hit London?
The most likely window for a London heatwave 2025 is late July to mid-August, when high pressure often settles over southern England. Long-range models suggest a brief hot spell could arrive around the third week of July, though nothing on the scale of the record-breaking 2022 event. For the latest timing, check the heatwave forecast regularly.
What does a heatwave mean for London?
In the capital, a heatwave uk means the Met Office’s Amber or Red warning criteria are met for three consecutive days. The London heatwave 2025 threshold is 28°C. During such events, the Tube can become uncomfortably hot, public health alerts are issued, and the NHS sees a rise in heat-related calls. Keep an eye on the UK weather hub for any warnings.
Is a heatwave expected in London next week?
No widespread heatwave is forecast for London next week. Temperatures may reach 26–28°C mid-week, but that is below the three-day threshold and will not trigger an official heatwave uk declaration.
How hot will it be in London today?
For heatwave london today, the mercury is expected to peak around 24–26°C in central areas, with hazy sunshine. This is a typical summer day, not a heatwave. Check the 10-day forecast for updates.
Will 2026 see a major London heatwave?
Heatwave london 2026 predictions are too far out for reliable detail. Climate trends suggest hotter summers are becoming more common, but specific events cannot be forecast more than two weeks ahead.