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

In September, Helsinki averages 16°C high / 10°C low with about 65 mm of rain; Mariehamn averages 16°C high / 9°C low with about 54 mm.

Helsinki vs Mariehamn in September

Helsinki is the better pick in September — 77 vs 73 on SeasonMap's comfort score. Helsinki is cool, a little rain, clean air, while Mariehamn is cool, a little rain, clean air.

Helsinki vs Mariehamn — September climate, side by side

	🇫🇮 Helsinki	Mariehamn
Comfort score	77/100 (B)	73/100 (B)
Feels-like high	15°C	14°C
Avg high / low	16° / 10°	16° / 9°
Rainfall	65 mm	54 mm
Rainy days	9	8
Humidity	82%	79%
Air quality (AQI)	37	38

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

Month by month

Helsinki vs Mariehamn in September — FAQ

Is September better in Helsinki or Mariehamn?: Helsinki is the better pick in September — 77 vs 73 on SeasonMap's comfort score. Helsinki is cool, a little rain, clean air, while Mariehamn is cool, a little rain, clean air.
What is the weather like in Helsinki vs Mariehamn in September?: In September, Helsinki averages 16°C high / 10°C low with about 65 mm of rain; Mariehamn averages 16°C high / 9°C low with about 54 mm.