Swansea
September
Weather in Swansea for September 2026
Your guide to Swansea weather in September - trends and predictions
Until now, September 2026 in Swansea is slightly cooler than the historical average by 0.9 °C.
The forecast for the next days in Swansea predicts temperatures to be around 18 °C, close to the historical average.
In general, the average temperature in Swansea at the beginning of September is 18.6 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 17 °C by the end of September.
Swansea experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 144.8 mm.
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Temperatures
Rain 🌧️
More
0
Dry days
30
Rainy days
0
Snow days
17°/13°
Temperatures
28 km/h
Avg max wind
80 %
Avg humidity
Swansea Weather September
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Temperatures trend during September in Swansea
See the weather trend as well as the moving average line
September weather in Swansea day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 18° /14° | 4.7 mm | 3 | |
| 2 Sept. | Light rain shower | 18° /14° | 2.8 mm | 4 | |
| 3 Sept. |  Partly cloudy | 18° /15° | 6.2 mm | 4 | |
| 4 Sept. | Patchy rain possible | 18° /14° | 2.6 mm | 4 | |
| 5 Sept. |  Sunny | 18° /13° | 4.9 mm | 4 | |
| 6 Sept. |  Overcast | 20° /15° | 2 mm | 4 | |
| 7 Sept. | Light rain shower | 20° /15° | 4.2 mm | 4 | |
| 8 Sept. | Partly cloudy | 18° /14° | 8.2 mm | 4 | |
| 9 Sept. | Patchy rain possible | 17° /13° | 1.1 mm | 3 | |
| 10 Sept. | Light rain shower | 18° /13° | 4 mm | 4 | |
| 11 Sept. | Light rain shower | 16° /12° | 3.9 mm | 4 | |
| 12 Sept. | Patchy rain possible | 18° /10° | 2.6 mm | 2.1 | |
| 13 Sept. | Light rain shower | 19° /15° | 9.9 mm | 2.9 | |
| 14 Sept. |  Fog | 19° /15° | 1.4 mm | 3.5 | |
| 15 Sept. | Mist | 18° /11° | 1.6 mm | 5 | |
| 16 Sept. | Patchy rain possible | 14° /10° | 0.7 mm | 3 | |
| 17 Sept. | Patchy rain possible | 15° /10° | 1.8 mm | 3 | |
| 18 Sept. | Overcast | 17° /10° | 0 mm | 4 | |
| 19 Sept. | Patchy rain possible | 18° /11° | 0.3 mm | 4 | |
| 20 Sept. | Patchy rain possible | 16° /8° | 0.2 mm | 5 | |
| 21 Sept. | Sunny | 16° /7° | 0 mm | 5 | |
| 22 Sept. | Overcast | 16° /8° | 0 mm | 4 | |
| 23 Sept. | Fog | 17° /14° | 1 mm | 4 | |
| 24 Sept. | Sunny | 22° /14° | 0 mm | 6 | |
| 25 Sept. | Sunny | 22° /13° | 0.2 mm | 6 | |
| 26 Sept. |  Moderate or heavy rain with thunder | 15° /10° | 10.1 mm | 3 | |
| 27 Sept. | Light rain shower | 15° /11° | 5.1 mm | 3 | |
| 28 Sept. | Light rain shower | 15° /11° | 3 mm | 4 | |
| 29 Sept. | Partly cloudy | 14° /10° | 6 mm | 4 | |
| 30 Sept. | Patchy rain possible | 16° /11° | 2.4 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.
Change Month
Swansea in September - FAQ
What are the expected maximum and minimum temperatures in Swansea during September?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 13°. 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 144.8 mm is expected in Swansea during September, occurring over more than 30 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 28 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Swansea
Explore the daily rainfall trends and prepare for Swanseas September weather 💧
Typically, Swansea has 30 rainy days in September with a total of 144.8 mm of rainfall.
UV exposure in Swansea during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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