Southampton
September
Weather in Southampton for September 2025
Your guide to Southampton weather in September - trends and predictions
In general, the average temperature in Southampton at the beginning of September is 22.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.9 °C by the end of September.
The climate of Southampton in September is notably wet, with an average of 12 rainy days.
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18
Dry days
12
Rainy days
0
Snow days
21°/14°
Temperatures
22 km/h
Avg max wind
75 %
Avg humidity
Southampton in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  23° | 2 21° | 3  22° | 4 22° | 5 22° | 6 23° | 7 24° |
| 8  23° | 9 23° | 10 23° | 11  19° | 12 17° | 13  16° | 14 18° |
| 15 20° | 16 22° | 17 20° | 18 21° | 19 21° | 20 20° | 21 19° |
| 22 18° | 23 17° | 24 18° | 25 17° | 26  18° | 27 16° | 28 16° |
| 29  16° | 30 17° |
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Temperatures trend during September in Southampton
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 23° /15° | 8.4 mm | 6 | |
| 2 Sept. | Light rain shower | 21° /14° | 1.2 mm | 5 | |
| 3 Sept. | Sunny | 22° /13° | 0.4 mm | 6 | |
| 4 Sept. | Sunny | 22° /13° | 1.8 mm | 6 | |
| 5 Sept. | Sunny | 22° /13° | 7.6 mm | 6 | |
| 6 Sept. | Sunny | 23° /15° | 6 mm | 6 | |
| 7 Sept. | Sunny | 24° /16° | 0.5 mm | 6 | |
| 8 Sept. | Partly cloudy | 23° /16° | 10.8 mm | 6 | |
| 9 Sept. | Sunny | 23° /14° | 0.4 mm | 6 | |
| 10 Sept. | Partly cloudy | 23° /13° | 1.1 mm | 6 | |
| 11 Sept. | Mist | 19° /11° | 0.1 mm | 4 | |
| 12 Sept. | Mist | 17° /10° | 0.4 mm | 4 | |
| 13 Sept. | Overcast | 16° /9° | 0 mm | 5 | |
| 14 Sept. | Sunny | 18° /9° | 0 mm | 6 | |
| 15 Sept. | Sunny | 20° /11° | 0 mm | 6 | |
| 16 Sept. | Partly cloudy | 22° /13° | 0 mm | 6 | |
| 17 Sept. | Light rain shower | 20° /12° | 2 mm | 6 | |
| 18 Sept. | Light rain shower | 21° /12° | 2.9 mm | 5 | |
| 19 Sept. | Light rain shower | 21° /14° | 1.1 mm | 5 | |
| 20 Sept. | Light rain shower | 20° /13° | 8.7 mm | 5 | |
| 21 Sept. | Light rain shower | 19° /12° | 4.6 mm | 5 | |
| 22 Sept. | Light rain shower | 18° /12° | 1.1 mm | 4 | |
| 23 Sept. | Patchy rain possible | 17° /10° | 0.5 mm | 4 | |
| 24 Sept. | Overcast | 18° /13° | 0.8 mm | 4 | |
| 25 Sept. | Overcast | 17° /12° | 3.2 mm | 4 | |
| 26 Sept. | Thundery outbreaks possible | 18° /12° | 14.1 mm | 4 | |
| 27 Sept. | Patchy rain possible | 16° /10° | 2.5 mm | 4 | |
| 28 Sept. | Patchy rain possible | 16° /9° | 0.4 mm | 4 | |
| 29 Sept. | Cloudy | 16° /9° | 1.9 mm | 4 | |
| 30 Sept. | Cloudy | 17° /10° | 5.8 mm | 4 | |
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Important Notice
Our weather forecast for Southampton 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 Southampton forecast closer to your planned date for the most up-to-date weather information.
Southampton in September - FAQ
What are the expected maximum and minimum temperatures in Southampton during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Southampton during September?
In September, Southampton can expect light to moderate rainfall, totaling 43.7 mm across approximately 12 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Southampton during September?
The average wind speed in Southampton during September is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
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