The temperatures in Swansea in September are usually low and can range between 12°C and 17°C.
You can expect about 3 to 8 days of rain in Swansea during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Swansea in September 2025.
If you’re planning to visit Swansea in the near future, we highly recommend that you review the 14 day weather forecast for Swansea before you arrive.
Temperatures
17° / 12°
Rainy Days
3
Snowy Days
0
Dry Days
27
Rainfall
55
mm
Sun Hours
8.6
Hrs
