September · Norway
Best time to visit Oslo in September Weather, crowds & prices
Weather in Oslo in September
Average temperature 12°C, 114 mm of rain, about 3 days with 6+ hours of sunshine and 89% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
5.5/10
Ranked #6 of 12 months
- Avg temp
- 12°C
- Rainfall
- 114 mm
- Humidity
- 89%
- Days with 6h+ sun
- 3
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Oslo scores 5.5/10 for sightseeing and cultural travel - an above-average month (#6 of 12). Expect around 12°C, 114 mm of rain, and roughly 3 days with 6+ hours of sunshine this month.
Fjord trails, sculpture parks, and modern waterfront culture peak May through September.
September in Oslo — workable with trade-offs
Expect 12°C (53°F) in September. A good month for city streets, viewpoints and long meals; leave swimming for another season.
114 mm of rain signals a properly wet month, with only about 3 days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 5.5/10 on the same scale — 6th of 12 months, versus 8.3/10 for the best month here.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a proper rain shell rather than an umbrella.
Expect mid-season pricing, and crowds are moderate.
If your dates are flexible, May is materially better in Oslo — 2.8 points higher on the same scale.
Frequently asked
- What is the weather like in Oslo in September?
- In September, Oslo averages 12°C, 114 mm of rain, and about 3 days with 6+ hours of sunshine. Its climate-comfort score is 5.5/10.
- Is September a good time to visit Oslo?
- September earns a 5.5/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Oslo in September?
- Expect about 114 mm of rain in September. Average humidity is 89% and there are about 3 days with 6+ hours of sunshine.
Curated in Oslo
Tickets & experiences
Things to do in Oslo
Oslo, Norway. Live activities and tours from GetYourGuide, matched to this destination.