After a sizzling June that smashed records across England, you’re probably wondering (or dreading): when will the next heatwave arrive? The summer of 2025 has already seen some serious heat, with temperatures soaring to 34.7°C in central London – the hottest day in Britain so far this year. But the heat isn’t done yet.
When is the next heatwave in London?
London is gearing up for another warm spell in July, with forecasters from the BBC predicting a heatwave from Wednesday, July 9 to Wednesday, July 16. During this period, temperatures are expected to range between 28°C and 31°C, accompanied by mostly sunny skies and gentle to light breezes.
The week kicks off on July 9 with a high of 28°C and a low of 15°C, featuring sunny weather and a gentle breeze. The following days maintain similar conditions, with highs steadily climbing: 28°C on July 10, 29°C on July 11, and reaching a peak of 31°C on Sunday, July 13. The warmth continues through the week, with temperatures hovering around 29°C to 30°C, paired with sunny intervals and light winds.
This upcoming heatwave follows a record-breaking June, as it was officially England’s warmest June ever, and the UK’s second warmest since records began in 1884. The hottest day so far came on a Tuesday in early July, when London’s St James’s Park hit 34.7°C. Other parts of southeast England, including Essex and Kent, also exceeded 33°C.
London heatwave dates and temperatures
- Wednesday 9 July: High 28°C, Low 15°C, sunny with a gentle breeze
- Thursday 10 July: High 28°C, Low 16°C, sunny intervals, light winds
- Friday 11 July: High 29°C, Low 17°C, sunny intervals, light winds
- Saturday 12 July: High 30°C, Low 18°C, sunny, light winds
- Sunday 13 July: High 31°C, Low 17°C, sunny, light winds
- Monday 14 July: High 30°C, Low 17°C, sunny, light winds
- Tuesday 15 July: High 29°C, Low 17°C, sunny, light winds
- Wednesday 16 July: High 29°C, Low 17°C, sunny intervals, light winds
With amber heat health alerts still in place for London and much of southern England, it’s important to stay hydrated, avoid strenuous activity during the hottest parts of the day, and look out for vulnerable people.