September · Finland
Best time to visit Helsinki in September Weather, crowds & prices
Weather in Helsinki in September
Average temperature 14°C, 76 mm of rain, about 25 days with 6+ hours of sunshine and 81% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.1/10
Ranked #5 of 12 months
- Avg temp
- 14°C
- Rainfall
- 76 mm
- Humidity
- 81%
- Days with 6h+ sun
- 25
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Helsinki scores 8.1/10 for sightseeing and cultural travel - an above-average month (#5 of 12). Expect around 14°C, 76 mm of rain, and roughly 25 days with 6+ hours of sunshine this month.
Helsinki spreads across a Baltic archipelago, with a design-led center, ferry-linked islands, and a strong sauna habit.
September in Helsinki — reliably good (5th best month)
Temperatures hover around 14°C (56°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 76 mm of rain this month — a flexible day or two helps — with about 25 days with 6+ hours of sunshine and 12.9 hours of daylight to work around it.
That is 8.1/10 on the same scale — 5th of 12 months, versus 9.6/10 for the best month here.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Budget for mid-season pricing, and crowds are moderate.
If your dates are flexible, June is materially better in Helsinki — 1.5 points higher on the same scale.
Frequently asked
- What is the weather like in Helsinki in September?
- In September, Helsinki averages 14°C, 76 mm of rain, and about 25 days with 6+ hours of sunshine. Its climate-comfort score is 8.1/10.
- Is September a good time to visit Helsinki?
- September earns a 8.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Helsinki in September?
- Expect about 76 mm of rain in September. Average humidity is 81% and there are about 25 days with 6+ hours of sunshine.
Curated in Helsinki
Tickets & experiences
Things to do in Helsinki
Helsinki, Finland. Live activities and tours from GetYourGuide, matched to this destination.