Weather in West Sussex for September 2025
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Until now, September 2025 in West Sussex is cooler than usual, with temperatures averaging 19.2 °C, this is -2.7 °C below the typical seasonal average.
Expect cooler weather in the next days in West Sussex with the forecast suggesting a temperature of 18.1 °C, lower than the historical average.
In general, the average temperature in West Sussex at the beginning of September is 22.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.6 °C by the end of September.
West Sussex in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 101.7 mm.
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West Sussex Weather September
Temperatures trend during September in West Sussex
September weather in West Sussex day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 23° /14° | 5.5 mm | 5 | |
| 2 Sept. | Patchy rain possible | 21° /14° | 2.2 mm | 5 | |
| 3 Sept. | Light rain shower | 23° /13° | 3 mm | 5 | |
| 4 Sept. | Light rain shower | 22° /12° | 4.6 mm | 5 | |
| 5 Sept. |  Sunny | 22° /12° | 6.7 mm | 5 | |
| 6 Sept. |  Partly cloudy | 23° /14° | 2.4 mm | 6 | |
| 7 Sept. | Patchy rain possible | 25° /14° | 1.1 mm | 6 | |
| 8 Sept. | Partly cloudy | 22° /14° | 4 mm | 6 | |
| 9 Sept. | Sunny | 23° /13° | 0 mm | 5 | |
| 10 Sept. | Light rain shower | 22° /13° | 2.7 mm | 5 | |
| 11 Sept. | Partly cloudy | 19° /10° | 0.8 mm | 4 | |
| 12 Sept. |  Overcast | 17° /9° | 1.7 mm | 4 | |
| 13 Sept. | Overcast | 17° /9° | 2.8 mm | 4 | |
| 14 Sept. | Patchy rain possible | 17° /9° | 2 mm | 0.5 | |
| 15 Sept. | Patchy rain possible | 17° /13° | 1 mm | 1 | |
| 16 Sept. | Patchy rain possible | 17° /11° | 0.7 mm | 0.6 | |
| 17 Sept. | Patchy rain possible | 18° /11° | 0.9 mm | 0.1 | |
| 18 Sept. | Patchy rain possible | 18° /17° | 1 mm | 0.2 | |
| 19 Sept. | Sunny | 21° /12° | 0 mm | 5 | |
| 20 Sept. | Sunny | 24° /15° | 0 mm | 5 | |
| 21 Sept. | Partly cloudy | 19° /15° | 0 mm | 5 | |
| 22 Sept. | Patchy rain possible | 17° /12° | 0.3 mm | 3 | |
| 23 Sept. | Sunny | 19° /10° | 0 mm | 4 | |
| 24 Sept. | Partly cloudy | 18° /9° | 0 mm | 4 | |
| 25 Sept. | Partly cloudy | 19° /14° | 0.1 mm | 5 | |
| 26 Sept. | Partly cloudy | 17° /13° | 0 mm | 4 | |
| 27 Sept. |  Moderate rain | 13° /11° | 5.3 mm | 3 | |
| 28 Sept. | Patchy rain possible | 16° /8° | 0.1 mm | 4 | |
| 29 Sept. | Light rain shower | 16° /9° | 1.5 mm | 4 | |
| 30 Sept. | Partly cloudy | 17° /9° | 8.1 mm | 5 | |
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West Sussex in September - FAQ
September rainfall patterns in West Sussex
UV exposure in West Sussex during September
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Where is West Sussex?Get accurate weather forecasts for West Sussex, located at latitude 51.113 and longitude -0.183. Stay updated with localized weather information tailored for West Sussex.