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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the MarketUK weather desk. Data from national met services via Open-Meteo.
Temperatures in London are forecast to reach 32–35°C on Thursday and Friday, with a 70% chance of the capital breaching the official heatwave threshold of three consecutive days above 28°C. This means a brief, intense hot spell rather than a prolonged heatwave.
What are the exact temperature and humidity forecasts for London?
Thursday peaks at 33°C in central London, with humidity dropping to 35% by midday. Friday is marginally hotter at 34–35°C, but a fresher Atlantic front arrives Saturday, dropping highs to 22°C. The 10 day weather forecast UK shows no further heatwave conditions next week.
How long will the heatwave London last?
The Met Office heatwave definition requires three consecutive days above the regional threshold (28°C in London). Current model runs show Thursday, Friday and Saturday all reaching 29°C or higher, meaning the official uk heatwave 2025 criteria will likely be met by Saturday morning. Conditions then break down rapidly.
Frequently Asked Questions
Is this a heatwave London today or just a warm day?
Today is the first of three hot days. A heatwave london today is confirmed if the 28°C threshold is reached, but the official classification requires the full three-day sequence.
Will there be a uk heatwave 2026 predictions issued?
Long-range models for summer 2026 are not reliable until spring 2026. The Met Office only issues seasonal outlooks from April onwards. Check the weather forecast heatwave UK page for updates.
Could a heatwave uk next week happen after this one?
No. The jet stream shifts south by Sunday, bringing cooler, unsettled conditions across the UK. No heatwave signals appear in the 8–14 day outlook for London or the South East.