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Weather in Greater London for September 2025

Your guide to Greater London weather in September - trends and predictions
  • In general, the average temperature in Greater London at the beginning of September is 23.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.4 °C by the end of September.

  • Greater London sees moderate rainfall in September, averaging 8 rainy days.

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Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/15°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
66 %
Avg humidity

Greater London in September average weather

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Temperatures trend during September in Greater London

See the weather trend as well as the moving average line

September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Overcast
Overcast
23° /15° 5.6 mm 5
2 Sept. Patchy rain possible
Patchy rain possible
23° /17° 0.3 mm 5
3 Sept. Overcast
Overcast
24° /15° 0.9 mm 5
4 Sept. Sunny
Sunny
22° /14° 4.9 mm 6
5 Sept. Partly cloudy
Partly cloudy
22° /15° 4.1 mm 6
6 Sept. Cloudy
Cloudy
26° /17° 2.3 mm 6
7 Sept. Sunny
Sunny
26° /17° 4.3 mm 7
8 Sept. Sunny
Sunny
24° /17° 10 mm 6
9 Sept. Sunny
Sunny
24° /17° 0 mm 6
10 Sept. Partly cloudy
Partly cloudy
25° /16° 1.6 mm 6
11 Sept. Cloudy
Cloudy
20° /13° 0.9 mm 5
12 Sept. Overcast
Overcast
17° /11° 0.3 mm 4
13 Sept. Overcast
Overcast
17° /11° 0 mm 4
14 Sept. Partly cloudy
Partly cloudy
20° /11° 0 mm 6
15 Sept. Sunny
Sunny
23° /12° 0 mm 7
16 Sept. Partly cloudy
Partly cloudy
23° /14° 0 mm 7
17 Sept. Light rain shower
Light rain shower
21° /14° 1 mm 6
18 Sept. Light rain shower
Light rain shower
22° /13° 5.1 mm 5
19 Sept. Light rain
Light rain
21° /14° 1 mm 5
20 Sept. Moderate rain
Moderate rain
20° /14° 13 mm 5
21 Sept. Light rain shower
Light rain shower
21° /13° 3.5 mm 5
22 Sept. Patchy light drizzle
Patchy light drizzle
19° /13° 8.8 mm 5
23 Sept. Partly cloudy
Partly cloudy
18° /11° 0.3 mm 5
24 Sept. Cloudy
Cloudy
18° /13° 1.1 mm 4
25 Sept. Overcast
Overcast
19° /13° 1.7 mm 5
26 Sept. Thundery outbreaks possible
Thundery outbreaks possible
19° /13° 6.9 mm 5
27 Sept. Patchy rain possible
Patchy rain possible
16° /11° 4.8 mm 4
28 Sept. Overcast
Overcast
17° /9° 0.1 mm 4
29 Sept. Patchy rain possible
Patchy rain possible
16° /11° 1 mm 4
30 Sept. Cloudy
Cloudy
17° /11° 9.8 mm 4
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Important Notice
Our weather forecast for Greater 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 Greater London forecast closer to your planned date for the most up-to-date weather information.

Greater London in September - FAQ

What are the expected maximum and minimum temperatures in Greater London during September?
During September, expect a variety of temperatures with highs around 22° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Greater London during September?
In September, Greater London can expect light to moderate rainfall, totaling 48.3 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Greater London during September?
The average wind speed in Greater London during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Greater London

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

UV exposure in Greater London during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Greater London?

Get accurate weather forecasts for Greater London, located at latitude 51.509 and longitude -0.126. Stay updated with localized weather information tailored for Greater London.

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