See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
16°
Mostly Clear
Feels Like: 17°
Min: 14°
Max: 20°
The next few hours will be overcast, with tomorrow reaching 22°C and dropping to 15°C. The coming days will be mostly cloudy
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:52
Sunrise
18:54
Sunset
Moon
Waxing Gibbous
16:50
Moonrise
00:08
Moonset
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View stargazing scoreWeather in London tomorrow, September 21, 2026
Expect a muted, overcast feel in London on September 21, 2026 as cloud persists. Brighter breaks, if they arrive, should stay brief. Expect a grey start, with morning cloud around 100% by 00:00. Outdoor plans early on should not rely on bright skies.
The temperature range runs from about 10°C up to 22°C. Moisture in the air spans 38%-82%, with the highest values around 07:00. Expect gentle winds, highest near 16:00 at 1.7 km/h.
Through the afternoon cloud remains the main feature, with cover near 60% around 18:00. Bright spells should stay limited even as the day wears on. Horizontal visibility sits around 38.0 km, briefly nearer 27.2 km. Expect sunrise at 06:53, sunset at 18:51, and 11 hours 57 minutes of sunlight today overall.
The practical takeaway for London on September 21, 2026 is a cloudy day that stays usable, just not particularly bright, around 22°C.
Frequently asked questions about weather in London
How warm does it get in London?
The warmest month in London is July, with average high temperatures of 22°C. The average temperature during this period is around 18°C.
How cold does it get in London?
The coldest month in London is January, with average low temperatures of 2°C. The average temperature during this period is around 5°C.
What is the wettest time of year in London?
The wettest month in London is October, with an average of 74mm of precipitation.
What is the driest time of year in London?
The driest month in London is April, with an average of 43mm of precipitation.
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