Oslo weather in August
Temperature, sea and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Good
Best time to visit: May – August
What is the weather like in Oslo in August?
In August, Oslo is mild: daytime highs average 20 °C, and nights cool down to about 13 °C. The sea averages 18.5 °C – bracing, so a wetsuit helps for longer swims. The sun shines for around 7 hours a day. Rain is frequent, with about 13 rainy days and 95 mm in total. All in all, August is a good month for a holiday in Oslo.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 79 | 75 | 64 |
| Day | 21° | 20° | 16° |
| Night | 14° | 13° | 10° |
| Sea | 18° | 19° | 16° |
| Sun | 8 h | 7 h | 6 h |
| Rain days | 12 | 13 | 10 |
More details for August
- Daylight
- 15 h 44 min05:30 – 21:14
- UV index
- 4 · moderateclear sky, noon (estimate)
- Muggy days
- 0 daysdew point 18 °C or more
- Wind
- 13 km/haverage daily peak
- Cloud cover
- 64 %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 %100 %
- Sunshineweight 20 %65 %
- Few rainy daysweight 30 %39 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Wetsuit for longer swims
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Oslo in August: quick answers
Is Oslo hot in August?
No. In August, Oslo is mild: daytime highs average 20 °C and nights drop to about 13 °C.
Can you swim in Oslo in August?
Only if you don't mind cold water: in August the sea averages just 18.5 °C. Comfortable swimming temperatures are not reached at any time of year.
Does it rain much in Oslo in August?
Rain is frequent, with about 13 rainy days and 95 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)