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 23 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.3 °C by the end of September.
London experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 78.7 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
9
Dry days
21
Rainy days
0
Snow days
20°/13°
Temperatures
16 km/h
Avg max wind
67 %
Avg humidity
London in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  22° | 2  22° | 3  23° | 4 22° | 5 22° | 6  25° | 7 25° |
| 8 24° | 9 23° | 10  23° | 11 20° | 12 21° | 13 18° | 14 21° |
| 15 21° | 16 21° | 17 20° | 18  21° | 19  20° | 20 20° | 21 21° |
| 22 20° | 23 19° | 24 19° | 25 19° | 26 19° | 27 16° | 28 16° |
| 29 16° | 30 16° |
You can click on date
Access London weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in London
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Overcast | 22° /14° | 4.6 mm | 5 | |
| 2 Sept. | Patchy rain possible | 22° /15° | 1.6 mm | 5 | |
| 3 Sept. | Partly cloudy | 23° /14° | 0.7 mm | 5 | |
| 4 Sept. | Overcast | 22° /13° | 2.5 mm | 5 | |
| 5 Sept. | Patchy rain possible | 22° /15° | 2.7 mm | 5 | |
| 6 Sept. | Sunny | 25° /16° | 2.8 mm | 6 | |
| 7 Sept. | Sunny | 25° /16° | 3.4 mm | 6 | |
| 8 Sept. | Partly cloudy | 24° /16° | 6.1 mm | 6 | |
| 9 Sept. | Patchy rain possible | 23° /16° | 2.1 mm | 5 | |
| 10 Sept. | Moderate or heavy rain shower | 23° /15° | 1.5 mm | 6 | |
| 11 Sept. | Patchy rain possible | 20° /13° | 0.6 mm | 5 | |
| 12 Sept. | Partly cloudy | 21° /12° | 0.6 mm | 5 | |
| 13 Sept. | Patchy rain possible | 18° /12° | 2.8 mm | 4 | |
| 14 Sept. | Moderate or heavy rain shower | 21° /12° | 4.4 mm | 5 | |
| 15 Sept. | Patchy rain possible | 21° /12° | 0 mm | 5 | |
| 16 Sept. | Patchy rain possible | 21° /13° | 0.1 mm | 6 | |
| 17 Sept. | Patchy rain possible | 20° /12° | 0.5 mm | 5 | |
| 18 Sept. | Cloudy | 21° /12° | 2.6 mm | 5 | |
| 19 Sept. | Heavy rain at times | 20° /13° | 1.6 mm | 5 | |
| 20 Sept. | Patchy rain possible | 20° /12° | 6.6 mm | 5 | |
| 21 Sept. | Sunny | 21° /12° | 1.8 mm | 5 | |
| 22 Sept. | Sunny | 20° /12° | 4.6 mm | 5 | |
| 23 Sept. | Overcast | 19° /12° | 1.1 mm | 5 | |
| 24 Sept. | Patchy rain possible | 19° /12° | 0.7 mm | 5 | |
| 25 Sept. | Overcast | 19° /12° | 0.9 mm | 5 | |
| 26 Sept. | Patchy rain possible | 19° /12° | 4.4 mm | 5 | |
| 27 Sept. | Moderate or heavy rain shower | 16° /11° | 4.4 mm | 4 | |
| 28 Sept. | Cloudy | 16° /9° | 3.6 mm | 4 | |
| 29 Sept. | Patchy rain possible | 16° /10° | 0.6 mm | 4 | |
| 30 Sept. | Moderate rain at times | 16° /9° | 9 mm | 4 | |
| 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.
London in September - FAQ
What are the expected maximum and minimum temperatures in London during September?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 13°. 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 78.7 mm spread over approximately 21 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 16 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 ☀️
Quick links
You are here
Where is London?Get accurate weather forecasts for London, located at latitude 51.509 and longitude -0.126. Stay updated with localized weather information tailored for London.
Related locations
Select a location for accurate weather forecast
More Locations Found a mistake?
We appreciate your attention to details. Tell us here.