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Weather in London for September 2026

Your guide to London weather in September - trends and predictions

    Temperatures

  • So far, September 2026 in London is slightly warmer than the historical average by 0.9 °C.

  • Expect cooler weather in the next days in London with the forecast suggesting a temperature of 21.1 °C, lower than the historical average.

  • In general, the average temperature in London at the beginning of September is 25.3 °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 10 rainy days and a total precipitation of 78.6 mm.

    • More

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

Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/12°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
73 %
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
26°
2
Fog
25°
3
Mist
28°
4
Partly cloudy
27°
5
Sunny
27°
6
Fog
24°
7
Light rain shower
20°
8
Overcast
22°
9
Overcast
25°
10
Overcast
24°
11
Overcast
26°
12
Sunny
26°
13
Sunny
24°
14
Sunny
19°
15
Overcast
23°
16
Partly cloudy
25°
17
Sunny
19°
18
Light rain shower
31°
19
Light rain shower
20°
20
Sunny
17°
21
Sunny
18°
22
Sunny
19°
23
Sunny
22°
24
Sunny
14°
25
Sunny
18°
26
Fog
23°
27
Overcast
22°
28
Light rain shower
20°
29
Patchy rain possible
23°
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
 26° /13° 0.2 mm 6
2 Sept. Fog
Fog
 25° /13° 17.2 mm 5
3 Sept. Mist
Mist
 28° /13° 23.1 mm 5
4 Sept. Partly cloudy
Partly cloudy
 27° /14° 6.5 mm 6
5 Sept. Sunny
Sunny
 27° /13° 0 mm 7
6 Sept. Fog
Fog
 24° /13° 4.5 mm 6
7 Sept. Light rain shower
Light rain shower
 20° /10° 2.3 mm 5
8 Sept. Overcast
Overcast
 22° /10° 0 mm 4
9 Sept. Overcast
Overcast
 25° /12° 2.7 mm 4
10 Sept. Overcast
Overcast
 24° /12° 0.1 mm 6
11 Sept. Overcast
Overcast
 26° /11° 0.1 mm 6
12 Sept. Sunny
Sunny
 26° /13° 0.6 mm 6.3
13 Sept. Sunny
Sunny
 24° /12° 0 mm 5.8
14 Sept. Sunny
Sunny
 19° /10° 0 mm 5
15 Sept. Overcast
Overcast
 23° /13° 3.8 mm 5
16 Sept. Partly cloudy
Partly cloudy
 25° /19° 0.1 mm 6
17 Sept. Sunny
Sunny
 19° /13° 3.7 mm 4
18 Sept. Light rain shower
Light rain shower
 31° /13° 12.4 mm 7
19 Sept. Light rain shower
Light rain shower
 20° /10° 19 mm 4
20 Sept. Sunny
Sunny
 17° /10° 0 mm 5
21 Sept. Sunny
Sunny
 18° /9° 0 mm 5
22 Sept. Sunny
Sunny
 19° /11° 0 mm 5
23 Sept. Sunny
Sunny
 22° /15° 0 mm 6
24 Sept. Sunny
Sunny
 14° /8° 0.1 mm 4
25 Sept. Sunny
Sunny
 18° /7° 2.2 mm 5
26 Sept. Fog
Fog
 23° /12° 0 mm 5
27 Sept. Overcast
Overcast
 22° /11° 0 mm 5
28 Sept. Light rain shower
Light rain shower
 20° /13° 1 mm 4
29 Sept. Patchy rain possible
Patchy rain possible
 23° /12° 0 mm 5
30 Sept. Mist
Mist
 23° /12° 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 78.6 mm spread over approximately 10 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 💧
Typically, London has 10 rainy days in September with a total of 78.6 mm of rainfall.

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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