Helsinki Weather in September
13.6°C high · 7.7°C low · 65 mm rain · 3.9h sun
Sep is a cool month in Helsinki — not peak season, but a good time to avoid crowds.
September at a glance
| Metric | Value |
|---|---|
| Average high | 13.6°C |
| Average low | 7.7°C |
| Rainfall | 65 mm |
| Sunshine | 3.9 hours/day |
| Daylight | 12.5 hours |
What to pack in September
Pack a jacket and layers for Helsinki in September.
Helsinki weather by month
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Frequently asked questions
What is the weather in Helsinki in September?
Highs of 13.6°C and lows of 7.7°C, with about 65 mm of rain and 3.9 hours of sunshine per day.
Is September a good time to visit Helsinki?
Sep is a cool month in Helsinki — not peak season, but a good time to avoid crowds.
What to do in Helsinki · Best time to visit Helsinki
Climate data: Open-Meteo Historical (ERA5), 1991–2020. CC BY 4.0.