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Weather in London for September 2025

Your guide to London weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in London is cooler than usual, with temperatures averaging 21.4 °C, this is -3.2 °C below the typical seasonal average.

  • The forecast for the next days in London predicts temperatures to be around 25 °C, close to the historical average.

  • In general, the average temperature in London at the beginning of September is 24.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.4 °C by the end of September.

    • Rain 🌧️

  • London experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 51.8 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/12°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
72 %
Avg humidity

London Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Partly cloudy
24°
2
Fog
23°
3
Mist
28°
4
Partly cloudy
27°
5
Mist
28°
6
Fog
24°
7
Light rain shower
19°
8
Overcast
21°
9
Overcast
25°
10
Overcast
25°
11
Overcast
26°
12
Moderate or heavy rain shower
25°
13
Overcast
24°
14
Cloudy
29°
15
Partly cloudy
26°
16
Partly cloudy
26°
17
Partly cloudy
31°
18
Sunny
33°
19
Sunny
25°
20
Sunny
25°
21
Sunny
29°
22
Patchy rain possible
20°
23
Patchy rain possible
24°
24
Patchy rain possible
26°
25
Patchy rain possible
21°
26
Sunny
16°
27
Sunny
17°
28
Light rain shower
18°
29
Patchy rain possible
22°
30
Mist
23°

Temperatures trend during September in London

See the weather trend as well as the moving average line

September weather in London day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Partly cloudy
Partly cloudy
 24° /10° 0 mm 6
2 Sept. Fog
Fog
 23° /10° 0 mm 5
3 Sept. Mist
Mist
 28° /11° 0 mm 6
4 Sept. Partly cloudy
Partly cloudy
 27° /13° 8.7 mm 7
5 Sept. Mist
Mist
 28° /13° 0 mm 7
6 Sept. Fog
Fog
 24° /13° 6.1 mm 5
7 Sept. Light rain shower
Light rain shower
 19° /10° 3 mm 4
8 Sept. Overcast
Overcast
 21° /9° 0 mm 5
9 Sept. Overcast
Overcast
 25° /10° 0 mm 5
10 Sept. Overcast
Overcast
 25° /11° 0 mm 6
11 Sept. Overcast
Overcast
 26° /12° 0.1 mm 6
12 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 25° /11° 5.2 mm 6
13 Sept. Overcast
Overcast
 24° /12° 0 mm 6
14 Sept. Cloudy
Cloudy
 29° /10° 0 mm 1.4
15 Sept. Partly cloudy
Partly cloudy
 26° /12° 0 mm 1.4
16 Sept. Partly cloudy
Partly cloudy
 26° /11° 0 mm 1.4
17 Sept. Partly cloudy
Partly cloudy
 31° /10° 0 mm 1.4
18 Sept. Sunny
Sunny
 33° /15° 0 mm 0
19 Sept. Sunny
Sunny
 25° /10° 0 mm 5
20 Sept. Sunny
Sunny
 25° /7° 0 mm 4
21 Sept. Sunny
Sunny
 29° /9° 0 mm 5
22 Sept. Patchy rain possible
Patchy rain possible
 20° /16° 1.2 mm 4
23 Sept. Patchy rain possible
Patchy rain possible
 24° /17° 2.2 mm 4
24 Sept. Patchy rain possible
Patchy rain possible
 26° /16° 2.5 mm 4
25 Sept. Patchy rain possible
Patchy rain possible
 21° /12° 1.3 mm 4
26 Sept. Sunny
Sunny
 16° /6° 0 mm 4
27 Sept. Sunny
Sunny
 17° /5° 0 mm 3
28 Sept. Light rain shower
Light rain shower
 18° /13° 1.5 mm 4
29 Sept. Patchy rain possible
Patchy rain possible
 22° /13° 0 mm 5
30 Sept. Mist
Mist
 23° /14° 0 mm 6
Next
Important Notice
Our weather forecast for London in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the London forecast closer to your planned date for the most up-to-date weather information.
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London in September - FAQ

What are the expected maximum and minimum temperatures in London during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in London during September?
Moderate rainfall is anticipated in London during September, with a total of 51.8 mm spread over approximately 7 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in London during September?
The average wind speed in London during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in London

Explore the daily rainfall trends and prepare for Londons September weather 💧

UV exposure in London during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Get accurate weather forecasts for London, located at latitude 42.983 and longitude -81.233. Stay updated with localized weather information tailored for London.

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