Turku Weather in September
Turku in September sees moderate temperatures, with highs around 17°C (63°F) and overnight lows of 8°C (46°F). Rainfall is fairly high at around 64 mm (2.5 in) on average, so pack waterproofs just in case.
Rainfall in Turku in September
Historically, approximately 18 days this month are expected to have rain, averaging 64 mm (2.5 in). Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.
Temperature in Turku in September
In September, Turku sees moderate temperatures, with highs of 17°C (63°F). Nights drop to around 8°C (46°F). This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. With lows around 8°C (46°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Turku in September
The area enjoys a moderate level of sunlight, with around 154 hours. It's a good balance between sunny and cloudy days.If your ideal day consists of dry skies and pleasant temperatures, June, July and August typically offer the best circumstances for Turku.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Finland, check out our Turku's climate page.
Turku Temperature in September
Min Temperature
8°C (46°F)
Max Temperature
17°C (63°F)
Chance of Rain
61%
Precipitation
64 mm (2.5 in)
Rainy days
18 days
Sunshine
154 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Turku typically drop from around 17°C (63°F) at the start of September to approximately 12°C (54°F) by the end. Nights are cold, with lows typically ranging from 5°C (41°F) to 10°C (50°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Turku in September
Browse day-by-day weather records for Turku spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Turku historical weather extremes in September
Based on weather observations in Turku between 1976 and 2025, these are the recorded extremes during September.
- The warmest day in September was on September 5, 2024, with a maximum of 27°C (81°F).
- Turku experienced its chilliest September day on September 28, 1976, reaching only 5°C (41°F).
- The lowest overnight temperature recorded in September was -6°C (21°F) (September 30, 1976).
- The wettest day in September Turku was on September 21, 2010 with 39 mm (1.5 in) of precipitation.
Best Places in Finland in September
Find out more about the weather in Finland and which places have the best travel conditions in this month. See all of Finland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Turku in September
For Turku in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Turku in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Finland, check out our Turku's climate page.
See the full Turku climate overview or explore weather in Finland.
