Weather in Norway for September 2025

In September, Norway experiences a transition from late summer to early autumn, bringing about noticeable changes in the weather. At the beginning of the month, southern parts of Norway, including Oslo, typically enjoy mild temperatures with occasional rainfall.

The average temperature in Oslo at the start of September is around 14°, making it a pleasant time to explore the city and its surrounding natural beauty.

However, as the month progresses, temperatures begin to drop gradually, and by the end of September, the average temperature in Oslo decreases to around 10°. The weather becomes cooler, and there is an increased chance of rain, particularly towards the latter part of the month.

In northern Norway, cities like Tromsø experience a more significant drop in temperatures throughout September. At the beginning of the month, the average temperature in Tromsø hovers around 10°, but by the end of September, it decreases to approximately 6°.

Additionally, as September progresses, the days become noticeably shorter, with fewer hours of daylight, marking the approach of the autumn equinox.

Overall, September in Norway showcases the transition from the lingering warmth of summer to the cooler and darker days of early autumn, making it a unique time to experience the changing seasons in this beautiful Scandinavian country.

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