The temperatures in Cardiff in August are usually low and can range between 55°F and 66°F.
You can expect about 3 to 8 days of rain in Cardiff 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 Cardiff in August 2025.
If you’re planning to visit Cardiff in the near future, we highly recommend that you review the 14 day weather forecast for Cardiff before you arrive.
Temperatures
66° / 55°
Rainy Days
6
Snowy Days
0
Dry Days
25
Rainfall
3.35
in
Sun Hours
8.7
Hrs
