Swansea
September
Weather in Swansea for September 2025
Your guide to Swansea weather in September - trends and predictions
In general, the average temperature in Swansea at the beginning of September is 19.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15 °C by the end of September.
Swansea experiences an exceptionally high level of rainfall in September, with more than 20 rainy days on average.
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9
Dry days
21
Rainy days
0
Snow days
18°/14°
Temperatures
27 km/h
Avg max wind
82 %
Avg humidity
Swansea in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  19° | 2  18° | 3 18° | 4  18° | 5 20° | 6 21° | 7 21° |
| 8 19° | 9 19° | 10  18° | 11 16° | 12  15° | 13 15° | 14  16° |
| 15 17° | 16 18° | 17 18° | 18 18° | 19 19° | 20 18° | 21 17° |
| 22 16° | 23 15° | 24 16° | 25 15° | 26  15° | 27 15° | 28 14° |
| 29 14° | 30 16° |
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Temperatures trend during September in Swansea
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 | 19° /14° | 1.9 mm | 4 | |
| 2 Sept. | Partly cloudy | 18° /13° | 1.4 mm | 5 | |
| 3 Sept. | Partly cloudy | 18° /14° | 1.2 mm | 5 | |
| 4 Sept. | Sunny | 18° /14° | 0.1 mm | 5 | |
| 5 Sept. | Sunny | 20° /14° | 9.9 mm | 5 | |
| 6 Sept. | Partly cloudy | 21° /16° | 4 mm | 5 | |
| 7 Sept. | Light rain shower | 21° /15° | 3.2 mm | 5 | |
| 8 Sept. | Partly cloudy | 19° /16° | 3 mm | 5 | |
| 9 Sept. | Patchy rain possible | 19° /14° | 0.4 mm | 4 | |
| 10 Sept. | Thundery outbreaks possible | 18° /13° | 1.9 mm | 5 | |
| 11 Sept. | Light rain shower | 16° /12° | 1.6 mm | 4 | |
| 12 Sept. | Cloudy | 15° /10° | 0.6 mm | 4 | |
| 13 Sept. | Partly cloudy | 15° /10° | 0 mm | 4 | |
| 14 Sept. | Overcast | 16° /12° | 0 mm | 4 | |
| 15 Sept. | Cloudy | 17° /13° | 0.3 mm | 4 | |
| 16 Sept. | Light rain shower | 18° /13° | 0.6 mm | 5 | |
| 17 Sept. | Light rain shower | 18° /14° | 8.5 mm | 5 | |
| 18 Sept. | Light rain shower | 18° /13° | 3.2 mm | 5 | |
| 19 Sept. | Light rain shower | 19° /14° | 6.8 mm | 5 | |
| 20 Sept. | Light rain shower | 18° /13° | 12.3 mm | 4 | |
| 21 Sept. | Light rain shower | 17° /12° | 10.1 mm | 4 | |
| 22 Sept. | Light rain shower | 16° /12° | 7.1 mm | 4 | |
| 23 Sept. | Cloudy | 15° /11° | 2.8 mm | 4 | |
| 24 Sept. | Light rain shower | 16° /13° | 6.3 mm | 4 | |
| 25 Sept. | Patchy rain possible | 15° /12° | 7.6 mm | 4 | |
| 26 Sept. | Moderate or heavy rain with thunder | 15° /11° | 15.1 mm | 4 | |
| 27 Sept. | Light rain shower | 15° /11° | 6.1 mm | 4 | |
| 28 Sept. | Light rain shower | 14° /11° | 4.4 mm | 4 | |
| 29 Sept. | Partly cloudy | 14° /11° | 9 mm | 4 | |
| 30 Sept. | Patchy rain possible | 16° /11° | 3.6 mm | 4 | |
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Important Notice
Our weather forecast for Swansea 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 Swansea forecast closer to your planned date for the most up-to-date weather information.
Swansea in September - FAQ
What are the expected maximum and minimum temperatures in Swansea during September?
Enjoy moderate daytime temperatures of up to 18° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Swansea during September?
Significant rainfall exceeding 122.7 mm is expected in Swansea during September, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Swansea during September?
The average wind speed in Swansea during September is 27 km/h, suggesting breezy to windy conditions, depending on your activities.
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