London is bracing for a late-summer warm spell, with forecasters predicting a remarkable 10-day stretch of dry, sunny and increasingly warm weather from Sunday, September 20 through Tuesday, September 29.
The weather forecast at a glance
According to BBC Weather and the Met Office, the capital will see daily highs of 22C or more across this period, peaking in the mid-20s by midweek as high pressure builds over southern England.
Upcoming London weather (BBC Weather, as of September 16–17)
- Thu Sep 17: 21C – Light rain showers, gentle breeze
- Fri Sep 18: 20C – Sunny intervals, gentle breeze
- Sat Sep 19: 21C – Light rain showers, gentle breeze
- Sun Sep 20: 22C – Sunny, gentle breeze
- Mon Sep 21: 22C – Sunny, light winds
- Tue Sep 22: 23C – Sunny intervals, light winds
- Wed Sep 23: 24C – Sunny, light winds
- Thu Sep 24: 24C – Sunny, gentle breeze
- Fri Sep 25: 24C – Sunny, gentle breeze
- Sat Sep 26: 24C – Sunny, gentle breeze
- Sun Sep 27: 22C – Sunny, gentle breeze
- Mon Sep 28: 22C – Sunny, gentle breeze
- Tue Sep 29: 22C – Sunny, gentle breeze
How unusual is this?
Temperatures of 22C+ for 10 consecutive days in late September are well above average for London, where mid-September highs typically sit in the high teens to low 20s.
Forecasters describe the setup as a “final spell of warm sunshine in 2026” for the capital, with the Met Office noting that while changeable conditions may return in early October, temperatures are still likely to remain above normal overall.
