Climate averages 1991–2020
Oslo weather
in August.
A mild, wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Oslo: daytime highs average 20.2°C and nights cool to about 13.2°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 112 mm of rain on roughly 14 days, which makes August a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 15 h 38 min on an average August day.
The nearest other city in this atlas is Lillestrøm (18 km away). In August its highs average 19.6°C, 0.6°C cooler than Oslo, with 104 mm of rain.
Among the 8 cities listed in Norway, Oslo ranks 2nd of 8 for the warmest August highs and 5th of 8 for the driest August (rainfall, lowest first). The mean August high of those 8 cities is 18.8°C; Oslo is 1.3°C warmer than that mean.
From August to September, average highs fall by 4.6°C to 15.5°C, and monthly rainfall falls from 112 mm to 89 mm.
The annual picture
August 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 | 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, selected | 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
August in nearby cities
- Lillestrøm in AugustNorway · 18 kmHigh 19.6°C · Low 12.3°C · 104 mm rain
- Drammen in AugustNorway · 36 kmHigh 20.3°C · Low 13.3°C · 104 mm rain
- Fredrikstad in AugustNorway · 78 kmHigh 19.7°C · Low 14.1°C · 86 mm rain
- Kristiansand in AugustNorway · 252 kmHigh 19.1°C · Low 13.3°C · 124 mm rain
- Gothenburg in AugustSweden · 255 kmHigh 20.0°C · Low 13.8°C · 118 mm rain
- Örebro in AugustSweden · 261 kmHigh 20.3°C · Low 13.3°C · 74 mm rain
- Borås in AugustSweden · 274 kmHigh 19.6°C · Low 12.9°C · 106 mm rain
- Stavanger in AugustNorway · 302 kmHigh 16.9°C · Low 12.8°C · 169 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.