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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the BritainNow weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the latest Met Office outlook before making plans this week — while a heatwave hasn’t been officially declared, a prolonged warm spell is possible across southern England, with temperatures climbing into the high 20s Celsius by midweek.
Is a heatwave coming to the UK next week?
The UK weather hub shows a ridge of high pressure building from the Azores, bringing settled conditions. The Met Office’s three-month outlook suggests above-average temperatures for late spring, but a formal heatwave requires three consecutive days above a regional threshold — typically 25 °C in most parts, 28 °C in London. Current Heatwave London guidance indicates that while the capital may approach that threshold, a full heatwave declaration remains uncertain until the 7-day forecast firms up.
How accurate are long-range heatwave forecasts?
Both the BBC Weather and UK weather forecast heatwave Met Office models show a 60–70 % chance of a warm spell lasting into early next week. The 10 Day Weather Forecast UK page offers a day-by-day breakdown, but confidence drops beyond five days. For now, the weather heatwave buzz is driven by computer models, not official warnings — so treat 14‑day outlooks with caution.
What qualifies as a UK heatwave?
A heatwave is defined by the Met Office as a period of at least three consecutive days when daily maximum temperatures meet or exceed a local threshold. This varies by county — 25 °C in most of England, 28 °C in London.
Will the heatwave affect the whole country?
No. Northern England, Scotland and Northern Ireland are likely to stay cooler, with highs around 18–22 °C. The UK spring weather forecast points to a north‑south split, typical for May.
How can I stay safe during a heatwave?
Stay hydrated, keep rooms cool by closing curtains, avoid the sun between 11am and 3pm, and check on vulnerable neighbours. The NHS has detailed advice on heat exhaustion and heatstroke — see the NHS heatwave guidance.