London
September
Weather in London for September 2025
Your guide to London weather in September - trends and predictions
In general, the average temperature in London at the beginning of September is 26.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.7 °C by the end of September.
London experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 51.8 mm.
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Temperatures
Rain 🌧️
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23
Dry days
7
Rainy days
0
Snow days
24°/12°
Temperatures
20 km/h
Avg max wind
72 %
Avg humidity
London in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  24° | 2  23° | 3 29° | 4 31° | 5 31° | 6 27° | 7  21° |
| 8  21° | 9 25° | 10 26° | 11 28° | 12  25° | 13 23° | 14 25° |
| 15 27° | 16 28° | 17  24° | 18 23° | 19 22° | 20 24° | 21 24° |
| 22 24° | 23 23° | 24 22° | 25 23° | 26 23° | 27 21° | 28 18° |
| 29 22° | 30 23° |
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Temperatures trend during September in 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. | Partly cloudy | 24° /11° | 0.1 mm | 6 | |
| 2 Sept. | Fog | 23° /10° | 0 mm | 6 | |
| 3 Sept. | Mist | 29° /12° | 0 mm | 7 | |
| 4 Sept. | Partly cloudy | 31° /14° | 0 mm | 8 | |
| 5 Sept. | Mist | 31° /16° | 0 mm | 8 | |
| 6 Sept. | Fog | 27° /16° | 9.1 mm | 6 | |
| 7 Sept. | Light rain shower | 21° /11° | 4.5 mm | 5 | |
| 8 Sept. | Overcast | 21° /9° | 0 mm | 5 | |
| 9 Sept. | Overcast | 25° /11° | 0 mm | 6 | |
| 10 Sept. | Overcast | 26° /11° | 0 mm | 6 | |
| 11 Sept. | Overcast | 28° /12° | 0.1 mm | 7 | |
| 12 Sept. | Moderate or heavy rain shower | 25° /13° | 7.8 mm | 6 | |
| 13 Sept. | Overcast | 23° /12° | 0 mm | 6 | |
| 14 Sept. | Mist | 25° /11° | 0 mm | 7 | |
| 15 Sept. | Partly cloudy | 27° /11° | 0 mm | 7 | |
| 16 Sept. | Mist | 28° /10° | 0 mm | 7 | |
| 17 Sept. | Patchy light drizzle | 24° /12° | 0.4 mm | 5 | |
| 18 Sept. | Fog | 23° /10° | 0 mm | 5 | |
| 19 Sept. | Fog | 22° /10° | 0 mm | 5 | |
| 20 Sept. | Overcast | 24° /10° | 0 mm | 5 | |
| 21 Sept. | Fog | 24° /14° | 4.6 mm | 6 | |
| 22 Sept. | Partly cloudy | 24° /14° | 0 mm | 6 | |
| 23 Sept. | Mist | 23° /13° | 18.3 mm | 5 | |
| 24 Sept. | Overcast | 22° /13° | 0 mm | 5 | |
| 25 Sept. | Partly cloudy | 23° /13° | 5.3 mm | 6 | |
| 26 Sept. | Overcast | 23° /12° | 0 mm | 5 | |
| 27 Sept. | Overcast | 21° /9° | 0 mm | 5 | |
| 28 Sept. | Light rain shower | 18° /13° | 1.5 mm | 4 | |
| 29 Sept. | Patchy rain possible | 22° /13° | 0 mm | 5 | |
| 30 Sept. | Mist | 23° /14° | 0 mm | 6 | |
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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.
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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