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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the Current UK weather desk. Data from national met services via Open-Meteo.
London heat waves typically occur when a persistent high-pressure system draws hot continental air across southeast England, pushing temperatures above 30°C for at least three consecutive days. The 2022 record of 40.3°C at Heathrow shows how extreme these events can become.
When do London heat waves usually happen?
Most London heat waves strike between June and August, though the July 2022 event that broke the UK all-time record arrived unusually early. Climate data from the Met Office shows that the capital now averages around four heat wave days per year, up from one in the 1960s. If you’re planning a summer trip, the last two weeks of July and the first week of August are statistically the hottest, but also the busiest with school holidays.
How to stay cool during a London heat wave
If a uk heatwave hits London, pack light cotton clothing, a reusable water bottle and sun cream. Many tube lines lack air conditioning, so plan journeys during cooler morning or evening hours. Parks with shade – Hyde Park, Regent’s Park, Hampstead Heath – offer relief, as do the many free museums with air conditioning. Check the 10 Day Weather Forecast UK before setting out, and avoid strenuous activity between 11am and 4pm.
Is a London heat wave dangerous?
Yes, particularly for older adults, young children and those with underlying health conditions. Heat exhaustion and heatstroke require immediate attention. The NHS advises staying indoors during peak heat, keeping hydrated and checking on vulnerable neighbours.
Will there be a heat in london today?
The most reliable way to know is to check the UK weather hub for live warnings. The Met Office issues yellow, amber and red heat-health alerts. If an amber or red warning is in place for London, a heat wave is either ongoing or imminent.
How long did the heatwave uk 2023 last?
Summer 2023 did not reach the extreme of 2022, but London saw a notable heat wave from 6–12 September, with temperatures peaking at 33°C. It was shorter and less intense than the record-breaking July 2022 event, which lasted nine days.