The temperatures in Carmarthen in August are usually low and can range between 13°C and 18°C.
You can expect about 3 to 8 days of rain in Carmarthen during the month of August. 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 Carmarthen in August 2025.
If you’re planning to visit Carmarthen in the near future, we highly recommend that you review the 14 day weather forecast for Carmarthen before you arrive.
Temperatures
18° / 13°
Rainy Days
7
Snowy Days
0
Dry Days
24
Rainfall
102
mm
Sun Hours
8.2
Hrs
