Oslo weather in September
September in Oslo: cool, rainy, with clean air — a great time to visit.
#6 of 12 months in Oslo · #400 of 604 destinations to visit in September · comfort 73/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Oslo climate normals — September
| Daytime high | 16°C / 61°F | 🙂 cool |
|---|---|---|
| Nighttime low | 10°C / 51°F | |
| Feels like (high) | 15°C / 59°F | |
| Rainfall | 102 mm / 4 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 10°C / 51°F | |
| Sunshine | 6.7 h/day | |
| Daylight | 12.8 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Oslo in September — FAQ
- Is September a good time to visit Oslo?
- September in Oslo: cool, rainy, with clean air — a great time to visit. It ranks #6 of 12 months for Oslo on SeasonMap's comfort score (73/100).
- What is the weather like in Oslo in September?
- In September, Oslo averages a daily high of 16.2°C and a low of 10.3°C, with about 101.5 mm of rain over roughly 11.4 rainy days.
- What is the air quality in Oslo in September?
- Oslo has a mean US Air Quality Index of about 38 in September.