Click on a day for an hourly weather forecast
The temperatures in Donegal in May are quite cold with temperatures between 6°C and 13°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Donegal. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Donegal in May 2025.
If you’re planning to visit Donegal in the near future, we highly recommend that you review the 14 day weather forecast for Donegal before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 6° / 2° | 13 | 13 | 5 | 173 mm | Awful | Donegal in January |
| February | 7° / 2° | 12 | 10 | 7 | 169 mm | Awful | Donegal in February |
| March | 9° / 3° | 12 | 15 | 4 | 129 mm | Awful | Donegal in March |
| April | 11° / 4° | 7 | 21 | 2 | 94 mm | Awful | Donegal in April |
| May | 13° / 6° | 9 | 22 | 0 | 130 mm | Bad | Donegal in May |
| June | 16° / 9° | 10 | 20 | 0 | 146 mm | Ok | Donegal in June |
| July | 17° / 11° | 11 | 20 | 0 | 164 mm | Ok | Donegal in July |
| August | 16° / 10° | 11 | 20 | 0 | 166 mm | Ok | Donegal in August |
| September | 15° / 9° | 10 | 20 | 0 | 136 mm | Ok | Donegal in September |
| October | 12° / 7° | 11 | 20 | 0 | 158 mm | Bad | Donegal in October |
| November | 8° / 4° | 12 | 17 | 1 | 181 mm | Bad | Donegal in November |
| December | 6° / 3° | 14 | 13 | 3 | 178 mm | Awful | Donegal in December |