Click on a day for an hourly weather forecast
The weather in Selfoss in May is very cold with temperatures between 4°C and 9°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Selfoss. 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.
Please note that Selfoss can expect a few days of snow in May.
Our weather forecast can give you a great sense of what weather to expect in Selfoss in May 2025.
If you’re planning to visit Selfoss in the near future, we highly recommend that you review the 14 day weather forecast for Selfoss before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -2° | 15 | 3 | 15 | 293 mm | Awful | Selfoss in January |
| February | 2° / -2° | 12 | 3 | 14 | 265 mm | Awful | Selfoss in February |
| March | 3° / -1° | 14 | 4 | 15 | 257 mm | Awful | Selfoss in March |
| April | 6° / 2° | 14 | 8 | 8 | 204 mm | Awful | Selfoss in April |
| May | 9° / 4° | 10 | 19 | 2 | 138 mm | Awful | Selfoss in May |
| June | 12° / 7° | 8 | 22 | 0 | 105 mm | Bad | Selfoss in June |
| July | 14° / 8° | 9 | 22 | 0 | 137 mm | Ok | Selfoss in July |
| August | 14° / 8° | 9 | 22 | 0 | 156 mm | Ok | Selfoss in August |
| September | 10° / 6° | 13 | 16 | 0 | 227 mm | Bad | Selfoss in September |
| October | 7° / 3° | 11 | 18 | 2 | 199 mm | Awful | Selfoss in October |
| November | 3° / 0° | 13 | 9 | 8 | 206 mm | Awful | Selfoss in November |
| December | 1° / -2° | 12 | 6 | 14 | 233 mm | Awful | Selfoss in December |