Weather in Southampton for September 2026
Until now, September 2026 in Southampton has been nearly identical to the historical average, with a temperature of 21.2 °C (showing only a slight deviation of 0.5 °C).
The forecast for the next days in Southampton predicts temperatures to be around 21 °C, close to the historical average.
In general, the average temperature in Southampton at the beginning of September is 22 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.9 °C by the end of September.
Southampton experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 77.7 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° /13° | 5.1 mm | 5 | |
| 2 Sept. | Light rain shower | 21° /13° | 2.6 mm | 4 | |
| 3 Sept. | Light rain shower | 22° /14° | 2.2 mm | 4 | |
| 4 Sept. |  Sunny | 21° /12° | 2.5 mm | 4 | |
| 5 Sept. | Sunny | 22° /12° | 3.8 mm | 5 | |
| 6 Sept. |  Overcast | 23° /14° | 3 mm | 5 | |
| 7 Sept. | Sunny | 23° /15° | 0.8 mm | 5 | |
| 8 Sept. |  Partly cloudy | 21° /13° | 9.5 mm | 5 | |
| 9 Sept. | Sunny | 21° /12° | 0.2 mm | 5 | |
| 10 Sept. | Light rain shower | 21° /12° | 1.6 mm | 4 | |
| 11 Sept. |  Mist | 19° /11° | 1.3 mm | 4 | |
| 12 Sept. | Sunny | 23° /11° | 0 mm | 4.4 | |
| 13 Sept. | Overcast | 24° /16° | 3.9 mm | 4.1 | |
| 14 Sept. | Overcast | 25° /13° | 0 mm | 3.5 | |
| 15 Sept. | Mist | 24° /12° | 1.3 mm | 5 | |
| 16 Sept. | Sunny | 18° /11° | 0.3 mm | 5 | |
| 17 Sept. | Overcast | 18° /9° | 0 mm | 4 | |
| 18 Sept. | Overcast | 19° /11° | 0.1 mm | 4 | |
| 19 Sept. | Overcast | 17° /13° | 14.9 mm | 5 | |
| 20 Sept. | Sunny | 18° /10° | 2.3 mm | 5 | |
| 21 Sept. | Patchy rain possible | 18° /12° | 3.1 mm | 5 | |
| 22 Sept. | Overcast | 18° /11° | 0 mm | 4 | |
| 23 Sept. | Mist | 23° /14° | 0 mm | 6 | |
| 24 Sept. | Overcast | 23° /14° | 0 mm | 5 | |
| 25 Sept. | Overcast | 24° /15° | 0 mm | 5 | |
| 26 Sept. |  Thundery outbreaks possible | 17° /10° | 9.4 mm | 4 | |
| 27 Sept. | Patchy rain possible | 16° /10° | 1.9 mm | 4 | |
| 28 Sept. | Patchy rain possible | 17° /10° | 0.4 mm | 4 | |
| 29 Sept. |  Cloudy | 17° /9° | 1.3 mm | 4 | |
| 30 Sept. | Cloudy | 18° /9° | 3.8 mm | 4 | |
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Southampton in September - FAQ
What are the expected maximum and minimum temperatures in Southampton during September?
How much rainfall should be expected in Southampton during September?
What are the typical wind conditions in Southampton during September?
September rainfall patterns in Southampton
UV exposure in Southampton during September
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