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.
With an average of 4 rainy days, London experiences minimal rainfall in September, ensuring that most days remain pleasantly dry.
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26
Dry days
4
Rainy days
0
Snow days
25°/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 25° 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?
In September, London can expect light to moderate rainfall, totaling 28.4 mm across approximately 4 days. Occasional showers are possible, and planning ahead for them could be helpful.
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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