The temperatures in Cardiff in May are quite cold with temperatures between 8°C and 15°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Cardiff during the month of May. 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 May 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
15° / 8°
Rainy Days
5
Snowy Days
0
Dry Days
26
Rainfall
71
mm
Sun Hours
8.7
Hrs
