Climate averages 1991–2020
Oslo weather
in May.
A mild, moderately wet month: the 4th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Oslo: daytime highs average 15.7°C and nights cool to about 6.4°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 77 mm of rain on roughly 11 days, which makes May a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 17 h 05 min on an average May day.
The nearest other city in this atlas is Lillestrøm (18 km away). In May its highs average 15.1°C, 0.6°C cooler than Oslo, with 74 mm of rain.
Among the 8 cities listed in Norway, Oslo ranks joint 1st of 8 for the warmest May highs and joint 5th of 8 for the driest May (rainfall, lowest first). The mean May high of those 8 cities is 13.9°C; Oslo is 1.7°C warmer than that mean.
From May to June, average highs rise by 3.7°C to 19.4°C, and monthly rainfall rises from 77 mm to 95 mm.
The annual picture
May in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Oslo climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.9°C-6.8°C | -6.8°C | 72 | 10.9 | 6.87 h |
| February | -0.4°C-6.4°C | -6.4°C | 52 | 8.6 | 9.19 h |
| March | 4.0°C-3.3°C | -3.3°C | 54 | 8.2 | 11.812 h |
| April | 9.8°C1.1°C | 1.1°C | 55 | 9.1 | 14.515 h |
| May, selected | 15.7°C6.4°C | 6.4°C | 77 | 11.4 | 17.117 h |
| June | 19.4°C10.9°C | 10.9°C | 95 | 12.3 | 18.719 h |
| July | 21.6°C13.9°C | 13.9°C | 100 | 12.6 | 18.018 h |
| August | 20.2°C13.2°C | 13.2°C | 112 | 14.2 | 15.616 h |
| September | 15.5°C9.5°C | 9.5°C | 89 | 10.8 | 12.913 h |
| October | 9.0°C4.6°C | 4.6°C | 94 | 11.7 | 10.210 h |
| November | 3.8°C0.3°C | 0.3°C | 92 | 12.0 | 7.68 h |
| December | -0.5°C-4.8°C | -4.8°C | 71 | 11.1 | 6.16 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Lillestrøm in MayNorway · 18 kmHigh 15.1°C · Low 5.8°C · 74 mm rain
- Drammen in MayNorway · 36 kmHigh 15.7°C · Low 6.3°C · 76 mm rain
- Fredrikstad in MayNorway · 78 kmHigh 14.7°C · Low 7.6°C · 61 mm rain
- Kristiansand in MayNorway · 252 kmHigh 14.1°C · Low 7.4°C · 77 mm rain
- Gothenburg in MaySweden · 255 kmHigh 15.5°C · Low 7.5°C · 72 mm rain
- Örebro in MaySweden · 261 kmHigh 15.7°C · Low 6.8°C · 53 mm rain
- Borås in MaySweden · 274 kmHigh 15.6°C · Low 6.9°C · 71 mm rain
- Stavanger in MayNorway · 302 kmHigh 11.5°C · Low 6.6°C · 93 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Oslo) is explained once on the Oslo year overview and on the Sources, method and limits page.