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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the UrbanMixr weather desk. Data from national met services via Open-Meteo.
London’s heat waves typically occur between June and August, with temperatures often exceeding 30°C. The most severe recent event was July 2022, when the mercury hit 40.3°C – the highest ever recorded in the capital. For current conditions, check our 10-day forecast.
When do London heat waves usually happen?
Most London heat waves arrive in July and August, though June can also see sustained hot spells. A UK heatwave is officially declared when a location records three or more consecutive days with maximum temperatures meeting or exceeding a regional threshold (28°C for London). The Met Office issues amber or red warnings when prolonged high temperatures pose a health risk. Visitors should plan for possible tube delays, as London Underground carriages can become uncomfortably warm without air conditioning.
What should travellers pack and expect during a heat wave?
Lightweight, breathable clothing, sunscreen, and a reusable water bottle are essential. Many hotels and attractions provide cooling stations, but public parks and shaded squares offer free relief. If you are visiting during a heatwave alert, consider adjusting your sightseeing schedule to early morning or late evening. The Bristol Weather page shows similar patterns across southern England, though London’s urban heat island effect tends to keep night-time temperatures higher.
Does the London Underground have air conditioning?
Only a few deep-level tube lines (e.g. the Victoria and Central lines) have partial air conditioning. Most trains rely on ventilation fans, so carriages can reach 35°C during a heat in london today. Carry water and choose above-ground routes where possible.
Was the heatwave uk 2023 as severe as 2022?
No – the london heat wave 2023 peaked at 33°C in September, not reaching the extremes of July 2022. However, 2023 saw an early June heatwave that disrupted travel. The Met Office recorded eight heatwave days in London that year.
Should I cancel my trip because of a heat wave?
Generally no. London’s infrastructure copes well with short hot spells, and many venues stay cool indoors. If a red warning is in place, reconsider outdoor events. Check our UK weather hub for live alerts before you travel.