The temperatures in Barmouth in September are quite cold with temperatures between 9°C and 15°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Barmouth 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 Barmouth in September 2025.
If you’re planning to visit Barmouth in the near future, we highly recommend that you review the 14 day weather forecast for Barmouth before you arrive.
Temperatures
15° / 9°
Rainy Days
7
Snowy Days
0
Dry Days
23
Rainfall
124
mm
Sun Hours
7.2
Hrs
