September · Finland
Best time to visit Turku in September Weather, crowds & prices
Weather in Turku in September
Average temperature 13°C, 58 mm of rain, about 2 days with 6+ hours of sunshine and 84% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
6.9/10
Ranked #5 of 12 months
- Avg temp
- 13°C
- Rainfall
- 58 mm
- Humidity
- 84%
- Days with 6h+ sun
- 2
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Turku scores 6.9/10 for sightseeing and cultural travel - an above-average month (#5 of 12). Expect around 13°C, 58 mm of rain, and roughly 2 days with 6+ hours of sunshine this month.
Turku, Finland's oldest city, lines the Aura river with a medieval castle, a cathedral and ferries to the archipelago.
September in Turku — middling scores, decent value
Temperatures hover around 13°C (55°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 58 mm of rain this month — a flexible day or two helps — with about 2 days with 6+ hours of sunshine and 12.5 hours of daylight to work around it.
That is 6.9/10 on the same scale — 5th of 12 months, versus 9.4/10 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 Turku — 2.5 points higher on the same scale.
Frequently asked
- What is the weather like in Turku in September?
- In September, Turku averages 13°C, 58 mm of rain, and about 2 days with 6+ hours of sunshine. Its climate-comfort score is 6.9/10.
- Is September a good time to visit Turku?
- September earns a 6.9/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Turku in September?
- Expect about 58 mm of rain in September. Average humidity is 84% and there are about 2 days with 6+ hours of sunshine.
Curated in Turku
Tickets & experiences
Things to do in Turku
Turku, Finland. Live activities and tours from GetYourGuide, matched to this destination.