West Sussex
September
Weather in West Sussex for September 2025
Your guide to West Sussex weather in September - trends and predictions
In general, the average temperature in West Sussex at the beginning of September is 20.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.7 °C by the end of September.
The climate of West Sussex in September is notably wet, with an average of 12 rainy days.
- New! Chat with our AI weatherman - it’s amazing and free.
18
Dry days
12
Rainy days
0
Snow days
19°/16°
Temperatures
27 km/h
Avg max wind
77 %
Avg humidity
West Sussex in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  21° | 2  19° | 3  20° | 4 20° | 5 20° | 6  20° | 7 22° |
| 8  19° | 9 21° | 10 21° | 11 17° | 12 17° | 13 17° | 14 17° |
| 15 19° | 16 21° | 17 19° | 18 20° | 19 20° | 20 19° | 21 18° |
| 22  17° | 23 16° | 24 18° | 25 17° | 26  17° | 27 16° | 28 16° |
| 29 16° | 30 17° |
You can click on date
Access West Sussex weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in West Sussex
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. | Moderate rain | 21° /16° | 11 mm | 5 | |
| 2 Sept. | Patchy rain possible | 19° /16° | 0.6 mm | 5 | |
| 3 Sept. | Sunny | 20° /15° | 1.1 mm | 5 | |
| 4 Sept. | Sunny | 20° /15° | 2.5 mm | 5 | |
| 5 Sept. | Sunny | 20° /15° | 13.9 mm | 5 | |
| 6 Sept. | Overcast | 20° /17° | 6.1 mm | 5 | |
| 7 Sept. | Sunny | 22° /17° | 0.4 mm | 6 | |
| 8 Sept. | Partly cloudy | 19° /17° | 3.8 mm | 5 | |
| 9 Sept. | Sunny | 21° /16° | 0.1 mm | 5 | |
| 10 Sept. | Partly cloudy | 21° /15° | 1.8 mm | 5 | |
| 11 Sept. | Sunny | 17° /13° | 0 mm | 5 | |
| 12 Sept. | Overcast | 17° /12° | 0.8 mm | 4 | |
| 13 Sept. | Overcast | 17° /11° | 0 mm | 5 | |
| 14 Sept. | Partly cloudy | 17° /13° | 0 mm | 5 | |
| 15 Sept. | Sunny | 19° /14° | 0 mm | 6 | |
| 16 Sept. | Sunny | 21° /15° | 0 mm | 6 | |
| 17 Sept. | Light rain shower | 19° /14° | 0.9 mm | 5 | |
| 18 Sept. | Light rain shower | 20° /15° | 9.8 mm | 5 | |
| 19 Sept. | Light rain shower | 20° /15° | 1.7 mm | 5 | |
| 20 Sept. | Light rain shower | 19° /15° | 16.8 mm | 5 | |
| 21 Sept. | Light rain shower | 18° /14° | 5.7 mm | 4 | |
| 22 Sept. | Patchy light drizzle | 17° /14° | 1.9 mm | 4 | |
| 23 Sept. | Patchy rain possible | 16° /12° | 0.6 mm | 4 | |
| 24 Sept. | Overcast | 18° /14° | 1.4 mm | 4 | |
| 25 Sept. | Overcast | 17° /15° | 5.9 mm | 4 | |
| 26 Sept. | Thundery outbreaks possible | 17° /14° | 10.1 mm | 4 | |
| 27 Sept. | Patchy rain possible | 16° /12° | 6.4 mm | 4 | |
| 28 Sept. | Patchy rain possible | 16° /11° | 0.2 mm | 4 | |
| 29 Sept. | Light rain shower | 16° /12° | 1.8 mm | 4 | |
| 30 Sept. | Partly cloudy | 17° /12° | 6 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for West Sussex 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 West Sussex forecast closer to your planned date for the most up-to-date weather information.
West Sussex in September - FAQ
What are the expected maximum and minimum temperatures in West Sussex during September?
During September, expect a variety of temperatures with highs around 19° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in West Sussex during September?
Moderate rainfall is anticipated in West Sussex during September, with a total of 86.4 mm spread over approximately 12 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in West Sussex during September?
The average wind speed in West Sussex during September is 27 km/h, suggesting breezy to windy conditions, depending on your activities.
Top locations in West Sussex
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is West Sussex?Get accurate weather forecasts for West Sussex, located at latitude 50.818 and longitude -0.375. Stay updated with localized weather information tailored for West Sussex.
Found a mistake?
We appreciate your attention to details. Tell us here.