At the OSLO BLINDERN weather station, which we use for Oslo, the warmest month is July (average high 22.7 °C) and the coldest January and February (average low −4.7 °C), averaged over 1991–2020. The wettest month is August (103 mm of rain). Norway's quietest month for visitors in 2025 was January.
Oslo weather by month
Averages for 1991–2020 at the OSLO BLINDERN weather station, copied from our Norway page, next to each month's share of Norway's tourist nights (Eurostat, 2025). These are long-term averages, not a forecast.
| Month | Average high | Average low | Rain | Rainy days | Daylight on the 15th | Share of 2025 |
|---|---|---|---|---|---|---|
| January | 0.1 °C | −4.7 °C | 58 mm | 10.0 days | 6 h 45 min | 4.9% |
| February | 1.1 °C | −4.7 °C | 46 mm | 8.0 days | 9 h 15 min | 5.7% |
| March | 5.3 °C | −2.1 °C | 41 mm | 7.0 days | 11 h 45 min | 6.3% |
| April | 11.0 °C | 2.1 °C | 48 mm | 8.0 days | 14 h 35 min | 5.9% |
| May | 16.7 °C | 6.8 °C | 60 mm | 9.0 days | 17 h 10 min | 8.2% |
| June | 20.4 °C | 10.8 °C | 80 mm | 10.0 days | 18 h 50 min | 11.9% |
| July | 22.7 °C | 13.4 °C | 87 mm | 11.0 days | 18 h | 18.2% |
| August | 21.3 °C | 12.5 °C | 103 mm | 11.0 days | 15 h 40 min | 13.6% |
| September | 16.4 °C | 8.6 °C | 82 mm | 9.0 days | 12 h 55 min | 8.4% |
| October | 9.6 °C | 3.8 °C | 93 mm | 11.0 days | 10 h 10 min | 6.5% |
| November | 4.4 °C | 0.0 °C | 85 mm | 11.0 days | 7 h 35 min | 5.5% |
| December | 0.9 °C | −3.7 °C | 54 mm | 10.0 days | 5 h 55 min | 4.9% |
Golden hour
Evening golden hour is our calculation for the 15th of each month of 2026: the time the sun takes to go from 6° above to 4° below the horizon (there is no official definition).
The quietest and busiest months
In 2025, January was Norway's quietest month (4.9% of the year's tourist nights): average high 0.1 °C, average low −4.7 °C, 58 mm of rain. July was the busiest (18.2%): average high 22.7 °C, average low 13.4 °C, 87 mm of rain. The figures do not show that the weather makes a month busier or quieter, so we do not say it does.
What these figures are
One weather station stands for Oslo; places nearby can differ, especially by height or distance from the sea. For the full picture of Norway, including regions and holidays, see our Norway page; for other places, the visual guides and golden hour by place.
Key takeaways
- Warmest month: July (average high 22.7 °C); coldest: January and February (average low −4.7 °C).
- Wettest month: August (103 mm); driest: March (41 mm).
- In 2025, January was Norway's quietest month for visitors and July the busiest.
Sources
Weather normals and daylight copied from our country or prefecture page; tourism shares from the same page. See how we research.
- Weather: WMO Member Nations (2023). WMO Climatological Standard Normals for 1991-2020 (NCEI Accession 0253808), station OSLO_BLINDERN (station ID 00001492), mean daily maximum and minimum temperature, precipitation and number of days with at least 1 mm of precipitation, normals computed from at least 24 years. NOAA National Centers for Environmental Information. Dataset. doi:10.25921/800j-vn07. Accessed 22 September 2026. Released by NOAA under CC0.
- Daylight: our calculation of the time from sunrise to sunset on the 15th of each month of 2026 at the weather station's location, by the method of the NOAA Solar Calculator (NOAA Global Monitoring Laboratory, “Solar Calculation Details”, based on Jean Meeus, Astronomical Algorithms, allowing 0.833° for refraction and the size of the sun). Read it. Checked 22 September 2026. NOAA notes that calculated times can differ from what is observed.
- Source: Eurostat, Nights spent at tourist accommodation establishments – monthly data, doi:10.2908/TOUR_OCC_NIM, accessed 25 September 2026. Dataset last updated by Eurostat on 22 September 2026. Extract: number of nights, NACE codes I55.1–I55.3, all guests and split by guests resident in the country and abroad, January–December 2025.
Modified data: the arrangement, the golden-hour and sea columns and the quietest/busiest comparison are ours, from the cited figures.