Trondheim Weather in September
13.5°C high · 6.4°C low · 108 mm rain · 3.7h sun
Sep is a cool month in Trondheim — not peak season, but a good time to avoid crowds.
September at a glance
| Metric | Value |
|---|---|
| Average high | 13.5°C |
| Average low | 6.4°C |
| Rainfall | 108 mm |
| Sunshine | 3.7 hours/day |
| Daylight | 12.6 hours |
What to pack in September
Pack a jacket and layers, plus a raincoat and umbrella for Trondheim in September.
Trondheim weather by month
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Frequently asked questions
What is the weather in Trondheim in September?
Highs of 13.5°C and lows of 6.4°C, with about 108 mm of rain and 3.7 hours of sunshine per day.
Is September a good time to visit Trondheim?
Sep is a cool month in Trondheim — not peak season, but a good time to avoid crowds.
What to do in Trondheim · Best time to visit Trondheim
Climate data: Open-Meteo Historical (ERA5), 1991–2020. CC BY 4.0.