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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the UK Bullet weather desk. Data from national met services via Open-Meteo.
A London heat wave means temperatures of 28°C or higher for at least three consecutive days, so check the forecast and plan to stay cool, hydrated and out of the sun between 11am and 3pm.
What is classed as a heat wave in London?
The Met Office defines a heat wave in London as three or more days when the daily maximum temperature reaches or exceeds 28°C. This threshold is higher than most of the UK because the capital’s urban heat island effect traps warmth overnight, making conditions feel more intense.
How should I prepare for a heat wave in London?
Keep indoor spaces cool by closing curtains during the day and opening windows at night. Drink plenty of water, avoid strenuous activity in the afternoon, and check on elderly neighbours or those with health conditions. The NHS advises staying in shaded or air-conditioned places when possible.
For the latest conditions, see our UK weather hub or the 10 day weather forecast UK page. If you are travelling, check Birmingham Weather and Bristol Weather for regional updates.
Is the London heat wave part of a wider UK heatwave?
Yes, a London heat wave often coincides with a broader uk heatwave affecting southern and central England. The Met Office may issue amber or red heat-health alerts when temperatures pose a risk to health. The heatwave uk 2023 saw several days above 30°C across multiple regions.
What is the heat in London today?
Check the Met Office or BBC Weather for the latest hourly readings. For a general idea, heat in london today typically peaks between 1pm and 4pm, so plan outdoor activities for early morning or evening.
How long does a London heat wave last?
Most London heat waves last 3–7 days, though some can extend to two weeks. The london heat wave 2023 in September lasted five days, with temperatures reaching 33°C in parts of the city.
Should I use public transport during a heat wave?
Yes, but expect delays as rails can buckle and overhead wires sag. Carry water, avoid travelling between 12pm and 3pm if possible, and check TfL for service updates before you set off.