Click on a day for an hourly weather forecast
The temperatures in Wales 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 Wales 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 Wales in May 2025.
If you’re planning to visit Wales in the near future, we highly recommend that you review the 14 day weather forecast for Wales before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / 4° | 8 | 20 | 3 | 86 mm | Awful | Wales in January |
| February | 8° / 4° | 8 | 18 | 3 | 77 mm | Awful | Wales in February |
| March | 10° / 4° | 6 | 24 | 1 | 62 mm | Ok | Wales in March |
| April | 12° / 6° | 5 | 25 | 0 | 48 mm | Ok | Wales in April |
| May | 15° / 8° | 5 | 26 | 0 | 71 mm | Good | Wales in May |
| June | 18° / 11° | 5 | 25 | 0 | 72 mm | Good | Wales in June |
| July | 20° / 13° | 5 | 26 | 0 | 77 mm | Good | Wales in July |
| August | 19° / 13° | 6 | 25 | 0 | 85 mm | Good | Wales in August |
| September | 18° / 12° | 4 | 26 | 0 | 56 mm | Good | Wales in September |
| October | 14° / 10° | 7 | 24 | 0 | 99 mm | Ok | Wales in October |
| November | 11° / 7° | 8 | 22 | 0 | 101 mm | Bad | Wales in November |
| December | 9° / 5° | 9 | 21 | 2 | 105 mm | Awful | Wales in December |