Weather in Southampton for September 2025
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Until now, September 2025 in Southampton has been significantly cooler than historical averages by -2 °C, with average temperature of 18.7 °C.
Expect cooler weather in the next days in Southampton with the forecast suggesting a temperature of 18.1 °C, lower than the historical average.
In general, the average temperature in Southampton at the beginning of September is 21.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.9 °C by the end of September.
Southampton in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 88.3 mm.
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Southampton Weather September
Temperatures trend during September in Southampton
September weather in Southampton day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 22° /14° | 6.8 mm | 5 | |
| 2 Sept. | Light rain shower | 21° /13° | 3.4 mm | 5 | |
| 3 Sept. | Light rain shower | 21° /14° | 2.7 mm | 5 | |
| 4 Sept. |  Sunny | 21° /13° | 3.2 mm | 5 | |
| 5 Sept. | Sunny | 22° /12° | 5.1 mm | 5 | |
| 6 Sept. | Sunny | 22° /14° | 4 mm | 5 | |
| 7 Sept. | Sunny | 23° /15° | 1 mm | 6 | |
| 8 Sept. |  Partly cloudy | 22° /14° | 7.2 mm | 5 | |
| 9 Sept. | Sunny | 22° /13° | 0.3 mm | 5 | |
| 10 Sept. | Light rain shower | 21° /13° | 2.1 mm | 5 | |
| 11 Sept. |  Mist | 19° /11° | 1.3 mm | 4 | |
| 12 Sept. | Light rain shower | 17° /10° | 2 mm | 4 | |
| 13 Sept. |  Overcast | 16° /9° | 2.7 mm | 4 | |
| 14 Sept. | Sunny | 18° /9° | 0.8 mm | 5 | |
| 15 Sept. | Patchy rain possible | 17° /14° | 1.2 mm | 0.9 | |
| 16 Sept. | Patchy rain possible | 18° /12° | 0.5 mm | 0.7 | |
| 17 Sept. | Patchy rain possible | 18° /13° | 3.1 mm | 0.4 | |
| 18 Sept. | Patchy rain possible | 21° /16° | 0.1 mm | 0.8 | |
| 19 Sept. | Sunny | 22° /15° | 0 mm | 0.8 | |
| 20 Sept. | Patchy rain possible | 19° /16° | 0.5 mm | 4 | |
| 21 Sept. | Patchy rain possible | 18° /14° | 3.2 mm | 4 | |
| 22 Sept. | Patchy rain possible | 18° /12° | 0.3 mm | 3 | |
| 23 Sept. | Patchy rain possible | 17° /13° | 3.2 mm | 3 | |
| 24 Sept. | Patchy rain possible | 17° /14° | 0.9 mm | 4 | |
| 25 Sept. |  Moderate rain | 16° /12° | 7.2 mm | 3 | |
| 26 Sept. | Sunny | 18° /10° | 0 mm | 4 | |
| 27 Sept. | Patchy rain possible | 18° /16° | 1.1 mm | 4 | |
| 28 Sept. | Patchy rain possible | 16° /13° | 0.3 mm | 3 | |
| 29 Sept. |  Cloudy | 16° /9° | 1.9 mm | 4 | |
| 30 Sept. | Cloudy | 17° /10° | 5.8 mm | 4 | |
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Southampton in September - FAQ
September rainfall patterns in Southampton
UV exposure in Southampton during September
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