Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Story Native weather desk. Data from national met services via Open-Meteo.
During a heat wave in the UK, you should stay hydrated, keep out of the sun between 11am and 3pm, and check on vulnerable neighbours. A heat wave is a prolonged period of unusually hot weather, often defined by the Met Office when a location records three consecutive days with maximum temperatures meeting or exceeding a specific threshold.
What counts as a heat wave in the UK?
The Met Office declares a heat wave when a location reaches its local temperature threshold for three days in a row. These thresholds vary by region—for example, 28°C in London and 25°C in northern England. This definition helps authorities issue timely health warnings and heat-health alerts.
How should you prepare for a heat wave today?
Check your local forecast via our UK weather hub or 10 day weather forecast. Keep indoor spaces cool by closing curtains during the day and opening windows at night. Avoid strenuous activity, drink plenty of water, and never leave people or pets in parked cars. The RSPCA advises providing shade and fresh water for animals.
What about other uses of the term “heat wave”?
The phrase also appears in a heat wave song (e.g., the 1963 hit by Martha and the Vandellas) and in the heat wave Pokémon move, a Fire-type attack. Internationally, a heat wave India event can be deadly, with temperatures exceeding 45°C. The 2023 film Heat Wave is a thriller set during extreme weather. For UK-specific heat wave weather, focus on local forecasts rather than these cultural references.
What temperature is a heat wave in the UK?
It varies by region. In London the threshold is 28°C; in northern counties it can be 25°C. The Met Office updates these annually based on the 1991–2020 climate average. Check your local area via the UK weather hub.
How long does a typical heat wave last?
Most UK heat waves last three to five days, though some extend to a week or more. The 1976 heat wave ran 15 days. A heat wave today often breaks when a cold front moves in from the Atlantic.
Is “heat wave” used differently in other countries?
Yes. In India, a heat wave is declared when temperatures reach 40°C in plains or 30°C in hills. The heat wave India definition helps issue red alerts for vulnerable populations. Definitions vary globally but share the core idea of unusually high temps.