What is the weather like in Helsinki vs Trondheim in September?

In September, Helsinki averages 16°C high / 10°C low with about 65 mm of rain; Trondheim averages 16°C high / 8°C low with about 96 mm.

Helsinki vs Trondheim in September

Helsinki and Trondheim are nearly tied in September — 77 vs 75 on SeasonMap's comfort score. Helsinki is cool, a little rain, clean air; Trondheim is cool, rainy, clean air.

Helsinki vs Trondheim — September climate, side by side

	🇫🇮 Helsinki	🇳🇴 Trondheim
Comfort score	77/100 (B)	75/100 (B)
Feels-like high	15°C	15°C
Avg high / low	16° / 10°	16° / 8°
Rainfall	65 mm	96 mm
Rainy days	9	12
Humidity	82%	83%
Air quality (AQI)	37	27

Monthly climate normals (ERA5 reanalysis). Comfort scores are SeasonMap estimates.

Month by month

Helsinki vs Trondheim in September — FAQ

Is September better in Helsinki or Trondheim?: Helsinki and Trondheim are nearly tied in September — 77 vs 75 on SeasonMap's comfort score. Helsinki is cool, a little rain, clean air; Trondheim is cool, rainy, clean air.
What is the weather like in Helsinki vs Trondheim in September?: In September, Helsinki averages 16°C high / 10°C low with about 65 mm of rain; Trondheim averages 16°C high / 8°C low with about 96 mm.