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.
Temperatures
8° / 5°
Rainy Days
11
Snowy Days
1
Dry Days
19
Rainfall
125
mm
Sun Hours
6.7
Hrs
