Monthly climate guide
Turku weather in September
September in Turku is typically mild, with average daytime highs around 16°C (61°F) and night-time lows near 9°C (48°F). The month usually brings about 65 mm of rain (some rain) and is often cloudy. Daytime highs are 5°C cooler than August and 7°C warmer than October.
What stands out in September
- Turku is usually about 2°C warmer than Tampere, 140 km away, in September.
- Seasonally, September counts as early autumn in Turku.
- Temperatures are falling — expect highs around 7°C lower by October.
Avg high
16°C
61°F
Avg low
9°C
48°F
Rainfall
65 mm
some rain
Humidity
85%
relative
Sky
66%
cloud · often cloudy
Turku weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | -3°C / 27°F | -7°C / 20°F | 57 mm | 97% | 84% |
| February | -1°C / 29°F | -7°C / 20°F | 51 mm | 97% | 80% |
| March | 2°C / 36°F | -4°C / 24°F | 43 mm | 90% | 69% |
| April | 8°C / 47°F | 0°C / 31°F | 40 mm | 82% | 68% |
| May | 15°C / 59°F | 5°C / 41°F | 47 mm | 77% | 60% |
| June | 19°C / 66°F | 10°C / 49°F | 64 mm | 77% | 63% |
| July | 22°C / 71°F | 13°C / 55°F | 62 mm | 76% | 64% |
| August | 21°C / 69°F | 12°C / 54°F | 60 mm | 78% | 62% |
| September | 16°C / 61°F | 9°C / 48°F | 65 mm | 85% | 66% |
| October | 9°C / 48°F | 3°C / 38°F | 76 mm | 91% | 77% |
| November | 4°C / 40°F | 1°C / 34°F | 69 mm | 95% | 86% |
| December | 1°C / 34°F | -2°C / 28°F | 79 mm | 96% | 86% |
What to pack for September
- A warm sweater or fleece for layering
- A mid-weight jacket
- A small travel umbrella, just in case
Is September a good time to visit Turku?
Compare the months in the chart above to find your ideal window.
Best time to visit Turku →Other Finland cities in September
Cite or embed this data
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Turku weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/finland/turku/september
<a href="https://weathercompare.eu/weather/finland/turku/september">Turku weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/finland/turku" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Turku weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/finland/turku/september">Turku weather in September</a> – WeatherCompare</p>
Turku in September: quick answers
Is September a good time to visit Turku?
September is a reasonable time for Turku: highs around 16°C and about 65 mm of rain, though not one of the three best months.
How warm is Turku in September?
Average highs are about 16°C (61°F) and average lows about 9°C (48°F), based on 10 years of daily data.
Does it rain a lot in Turku in September?
Turku typically gets around 65 mm of rain in September — some rain.
Figures are long-term averages for the area around Turku (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.