Overview and confirmed timeline
This article is dated 10 August 2026. London has entered its fifth heatwave of the summer. Forecasters say the heatwave began on 9 August and will continue until 15 August. The information below sets out the confirmed timeline and the temperature outlook for the coming days.
Temperature outlook for the week
Forecasters predict that the hottest day of the spell will be Thursday 13 August. The Met Office predicts 34C for that day; some forecasters say temperatures could reach 36C. Those figures are the confirmed peak predictions provided for the period covered by the heatwave.
Amber heat-health alert in force
An amber heat-health alert is in force until 9pm on Friday 14 August. That alert status applies to part of the period of the heatwave and is a confirmed official measure in place while high temperatures are expected. The alert end time is 9pm on 14 August, while the heatwave overall is forecast to continue until 15 August.
Practical context for London readers
What is confirmed: the heatwave began on 9 August, will continue through 15 August, the warmest day is predicted on 13 August, the Met Office predicts 34C for that day and some forecasters suggest it could reach 36C, and an amber heat-health alert is in force until 9pm on 14 August. For London residents, those fixed dates and the range of predicted peak temperatures provide a clear timeframe for when the city is expected to experience sustained unseasonably high temperatures. Readers may find it helpful to note the specific dates given here and to follow official channels for any updates during the period covered by the alert and the forecast. This report uses only confirmed facts issued for this episode of hot weather and does not speculate about causes, local impacts, or conditions outside the stated dates and temperature predictions.
For Further information on this update, readers can consult the linked source document.
