Greater London
September
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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22
Dry days
8
Rainy days
0
Snow days
22°/15°
Temperatures
16 km/h
Avg max wind
66 %
Avg humidity
Greater London in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  23° | 2  23° | 3 24° | 4  22° | 5  22° | 6  26° | 7 26° |
| 8 24° | 9 24° | 10 25° | 11 20° | 12 17° | 13 17° | 14 20° |
| 15 23° | 16 23° | 17 21° | 18 22° | 19  21° | 20  20° | 21 21° |
| 22 19° | 23 18° | 24 18° | 25 19° | 26  19° | 27 16° | 28 17° |
| 29 16° | 30 17° |
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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 | 23° /15° | 5.6 mm | 5 | |
| 2 Sept. | Patchy rain possible | 23° /17° | 0.3 mm | 5 | |
| 3 Sept. | Overcast | 24° /15° | 0.9 mm | 5 | |
| 4 Sept. | Sunny | 22° /14° | 4.9 mm | 6 | |
| 5 Sept. | Partly cloudy | 22° /15° | 4.1 mm | 6 | |
| 6 Sept. | Cloudy | 26° /17° | 2.3 mm | 6 | |
| 7 Sept. | Sunny | 26° /17° | 4.3 mm | 7 | |
| 8 Sept. | Sunny | 24° /17° | 10 mm | 6 | |
| 9 Sept. | Sunny | 24° /17° | 0 mm | 6 | |
| 10 Sept. | Partly cloudy | 25° /16° | 1.6 mm | 6 | |
| 11 Sept. | Cloudy | 20° /13° | 0.9 mm | 5 | |
| 12 Sept. | Overcast | 17° /11° | 0.3 mm | 4 | |
| 13 Sept. | Overcast | 17° /11° | 0 mm | 4 | |
| 14 Sept. | Partly cloudy | 20° /11° | 0 mm | 6 | |
| 15 Sept. | Sunny | 23° /12° | 0 mm | 7 | |
| 16 Sept. | Partly cloudy | 23° /14° | 0 mm | 7 | |
| 17 Sept. | Light rain shower | 21° /14° | 1 mm | 6 | |
| 18 Sept. | Light rain shower | 22° /13° | 5.1 mm | 5 | |
| 19 Sept. | Light rain | 21° /14° | 1 mm | 5 | |
| 20 Sept. | Moderate rain | 20° /14° | 13 mm | 5 | |
| 21 Sept. | Light rain shower | 21° /13° | 3.5 mm | 5 | |
| 22 Sept. | Patchy light drizzle | 19° /13° | 8.8 mm | 5 | |
| 23 Sept. | Partly cloudy | 18° /11° | 0.3 mm | 5 | |
| 24 Sept. | Cloudy | 18° /13° | 1.1 mm | 4 | |
| 25 Sept. | Overcast | 19° /13° | 1.7 mm | 5 | |
| 26 Sept. | Thundery outbreaks possible | 19° /13° | 6.9 mm | 5 | |
| 27 Sept. | Patchy rain possible | 16° /11° | 4.8 mm | 4 | |
| 28 Sept. | Overcast | 17° /9° | 0.1 mm | 4 | |
| 29 Sept. | Patchy rain possible | 16° /11° | 1 mm | 4 | |
| 30 Sept. | 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.
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