Click on a day for an hourly weather forecast
The temperatures in Keflavik in May are quite cold with temperatures between 5°C and 8°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Keflavik. 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 Keflavik can expect a few days of snow in May.
Our weather forecast can give you a great sense of what weather to expect in Keflavik in May 2025.
If you’re planning to visit Keflavik in the near future, we highly recommend that you review the 14 day weather forecast for Keflavik before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / 1° | 14 | 6 | 11 | 203 mm | Awful | Keflavik in January |
| February | 4° / 1° | 12 | 7 | 9 | 178 mm | Awful | Keflavik in February |
| March | 4° / 2° | 13 | 7 | 11 | 183 mm | Awful | Keflavik in March |
| April | 5° / 3° | 13 | 12 | 6 | 146 mm | Awful | Keflavik in April |
| May | 8° / 5° | 11 | 19 | 1 | 125 mm | Bad | Keflavik in May |
| June | 10° / 8° | 7 | 23 | 0 | 88 mm | Bad | Keflavik in June |
| July | 12° / 10° | 7 | 24 | 0 | 102 mm | Bad | Keflavik in July |
| August | 12° / 10° | 7 | 24 | 0 | 124 mm | Bad | Keflavik in August |
| September | 10° / 8° | 13 | 17 | 0 | 204 mm | Bad | Keflavik in September |
| October | 8° / 5° | 12 | 17 | 1 | 184 mm | Bad | Keflavik in October |
| November | 6° / 3° | 13 | 11 | 6 | 160 mm | Awful | Keflavik in November |
| December | 4° / 2° | 11 | 11 | 9 | 156 mm | Awful | Keflavik in December |