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

In September, Helsinki averages 16°C high / 10°C low with about 65 mm of rain; London averages 21°C high / 12°C low with about 56 mm.

Helsinki vs London in September

London is the better pick in September — 84 vs 77 on SeasonMap's comfort score. London is nice, a little rain, clean air, while Helsinki is cool, a little rain, clean air.

Helsinki vs London — September climate, side by side

	Helsinki	London
Comfort score	77/100 (B)	84/100 (A)
Feels-like high	15°C	19°C
Avg high / low	16° / 10°	21° / 12°
Rainfall	65 mm	56 mm
Rainy days	9	11
Humidity	82%	78%
Air quality (AQI)	37	46

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

Helsinki vs London in September — FAQ

Is September better in Helsinki or London?: London is the better pick in September — 84 vs 77 on SeasonMap's comfort score. London is nice, a little rain, clean air, while Helsinki is cool, a little rain, clean air.
What is the weather like in Helsinki vs London in September?: In September, Helsinki averages 16°C high / 10°C low with about 65 mm of rain; London averages 21°C high / 12°C low with about 56 mm.