The temperatures in Oslo in May are quite cold with temperatures between 5°C and 15°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Oslo 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.
Please note that Oslo can expect a few days of snow in May.
Our weather forecast can give you a great sense of what weather to expect in Oslo in May 2025.
If you’re planning to visit Oslo in the near future, we highly recommend that you review the 14 day weather forecast for Oslo before you arrive.
Temperatures
15° / 5°
Rainy Days
7
Snowy Days
1
Dry Days
23
Rainfall
85
mm
Sun Hours
8.6
Hrs
