Hottest (avg)
#4 / 12
London in September
September weather, climate averages, and packing tips.
Avg High
Avg Low
Rain
Daylight 13h
What to expect
As autumn continues, September brings, where temperatures are dropping quickly. Thermometers typically reach 19°C / 66°F, with evenings cooling to 11°C / 52°F.
Skies are often overcast, and you should be prepared for regular rainfall (approx. 12 wet days).
September in context
How it compares to the rest of the year in London.
Wettest (avg)
#9 / 12
Daylight Hours
#6 / 12
Windiest (avg)
#9 / 12
Highest UV
#6 / 12
Most Humid
#7 / 12
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight
- 12.6 hours
- UV index (max)
- 5
- Typical sun hours
- 05:36 – 18:14
Rain & Snow
- Total
-
- Rainy days
- 12
- Cloud cover
- 66%
- Snowfall
-
Humidity & Wind
- Humidity (avg)
- 78%
- Wind (avg)
-
- Wind (max gusts)
-
Frequently asked questions
Is September a good time to visit London?
Typical September days in London reach highs of 19°C (66°F) with nights around 11°C (52°F). It usually feels mild by day and cool after dark. Overall, September sits in the middle of the London climate range.
What are temperatures like in September?
In September, you can usually expect highs of 19°C (66°F) and lows near 11°C (52°F). That means mild days and cool nights, so pack layers you can add or remove.
How much does it rain in September?
Rainfall in September averages 50 mm (2.0 in) across roughly 12 days. Overall it is a quite rainy time of year, so a light rain jacket and waterproof shoes are very handy.
How many hours of daylight are there in September?
You can expect about 13 hours of daylight in September. Sunrise is typically around 05:36 and sunset near 18:14. Daylight is fairly typical, with enough time for sightseeing.
Does the weather change during September?
September usually begins milder and cools down as the month goes on, so late-September can feel more like the next month.
How strong is the sun in September?
UV levels are moderate (around 5); sunscreen and sunglasses are still a good idea.
Is it windy in September?
In September, average wind speeds are around 13 km/h (8 mph), with gusts on the windiest days reaching about 57 km/h (35 mph). On the ground, it is it can feel quite windy at times, particularly when weather systems move through.