Oslo weather in May
Temperature, sea and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Good
Best time to visit: May – August
What is the weather like in Oslo in May?
In May, Oslo is cool: daytime highs average 15 °C, and nights cool down to about 6 °C. The sea averages 10.9 °C – swimming is only for the hardy. The sun shines for around 9 hours a day. Rain is frequent, with about 11 rainy days and 72 mm in total. All in all, May is a good month for a holiday in Oslo.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 17 h 3 min04:42 – 21:45
- UV index
- 5 · moderateclear sky, noon (estimate)
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 14 km/haverage daily peak
- Cloud cover
- 59 %on average
- Hot days
- 0 days30 °C or more
- Snow days
- 0 days1 cm or more of fresh snow
- Time zone
- UTC+2Europe/Oslo
How the score comes together
- Temperatureweight 50 %74 %
- Sunshineweight 20 %95 %
- Few rainy daysweight 30 %51 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in May
- Sunscreen
- Sunglasses & sun hat
- A jumper for the evenings
- Rain jacket or umbrella
Oslo in May: quick answers
Is Oslo hot in May?
No. In May, Oslo is cool: daytime highs average 15 °C and nights drop to about 6 °C.
Can you swim in Oslo in May?
Only if you don't mind cold water: in May the sea averages just 10.9 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Oslo in May?
Rain is frequent, with about 11 rainy days and 72 mm in total.
Oslo month by month
The whole year in OsloAll destinations: Norway
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)