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 heat wave in the UK occurs when daily maximum temperatures meet or exceed a regional threshold (usually 25–28°C) for three consecutive days. These hot spells typically arrive between June and August, bringing health warnings, travel disruption, and sometimes cultural references — from the classic Heat Wave song to the Pokémon ability of the same name.
What counts as a heat wave in the UK?
The Met Office sets county-level thresholds. In southern England the trigger is 28°C; in northern Scotland it can be as low as 25°C. A heat wave is declared only after three consecutive days at or above that level. The hottest UK heat wave on record was July 2022, when Coningsby, Lincolnshire reached 40.3°C. Climate change is making these events more frequent and intense.
How to stay safe during a heat wave today
If a heat wave is forecast, keep indoor spaces cool, drink plenty of water, and avoid direct sun between 11am and 3pm. Vulnerable people — older adults, young children, and those with long-term conditions — need extra care. The NHS advises checking on neighbours and never leaving anyone or pets in a parked car. For real-time alerts, check your local forecast on the UK weather hub.
When is a heat wave most likely in the UK?
July and August are peak months, though heat waves can begin in June and occasionally extend into September. The 10 day weather forecast helps you plan ahead.
How does a UK heat wave compare with a heat wave in India?
India’s heat waves are far more extreme, with temperatures often exceeding 45°C and higher humidity. UK heat waves, though milder, still pose serious risks because infrastructure and homes are not designed for prolonged heat.
What does ‘heat wave temperature’ mean in practice?
It means the daily maximum temperature is high enough to trigger a heat wave declaration. Check the Met Office’s regional thresholds — a heat wave in Scotland may start at 25°C, while southern England needs 28°C.