Southwest Finland (Turku)
September
Weather in Southwest Finland for September 2025
Your guide to Southwest Finland weather in September - trends and predictions
Wind Warning for Marine Areas - See hour by hour.
So far, September 2025 in Southwest Finland is slightly warmer than the historical average by 0.8 °C.
The forecast for the next days in Southwest Finland predicts a temperature of 14 °C, which is cooler than the historical average.
In general, the average temperature in Southwest Finland at the beginning of September is 19 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.1 °C by the end of September.
The climate of Southwest Finland in September is notably wet, with an average of 14 rainy days, and a total of 94.8 mm of precipitation.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
16
Dry days
14
Rainy days
0
Snow days
17°/11°
Temperatures
21 km/h
Avg max wind
80 %
Avg humidity
Southwest Finland Weather September
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Temperatures trend during September in Southwest Finland
See the weather trend as well as the moving average line
September weather in Southwest Finland day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 17° /11° | 10.9 mm | 4 | |
| 2 Sept. | Light rain shower | 17° /11° | 3.4 mm | 4 | |
| 3 Sept. |  Cloudy | 18° /12° | 0.9 mm | 4 | |
| 4 Sept. | Cloudy | 20° /13° | 0 mm | 5 | |
| 5 Sept. |  Overcast | 21° /13° | 0 mm | 5 | |
| 6 Sept. | Cloudy | 20° /12° | 0.2 mm | 5 | |
| 7 Sept. |  Partly cloudy | 20° /12° | 1.2 mm | 5 | |
| 8 Sept. |  Mist | 22° /14° | 0 mm | 6 | |
| 9 Sept. | Partly cloudy | 21° /15° | 0 mm | 5 | |
| 10 Sept. | Overcast | 20° /14° | 1.7 mm | 4 | |
| 11 Sept. | Mist | 20° /14° | 1.9 mm | 5 | |
| 12 Sept. | Overcast | 17° /13° | 3.9 mm | 4 | |
| 13 Sept. | Mist | 18° /11° | 0.6 mm | 4 | |
| 14 Sept. | Partly cloudy | 15° /10° | 12.6 mm | 4 | |
| 15 Sept. | Cloudy | 16° /8° | 5.9 mm | 4 | |
| 16 Sept. |  Moderate rain | 16° /13° | 11.6 mm | 0.6 | |
| 17 Sept. | Moderate rain | 15° /12° | 7.4 mm | 0.5 | |
| 18 Sept. | Patchy rain possible | 15° /12° | 1.9 mm | 0.5 | |
| 19 Sept. | Patchy rain possible | 15° /12° | 1.6 mm | 0.5 | |
| 20 Sept. | Patchy rain possible | 17° /12° | 0.5 mm | 0.6 | |
| 21 Sept. | Patchy rain possible | 14° /12° | 0.5 mm | 3 | |
| 22 Sept. | Patchy rain possible | 15° /10° | 1.3 mm | 3 | |
| 23 Sept. | Patchy rain possible | 10° /6° | 0.4 mm | 2 | |
| 24 Sept. |  Sunny | 13° /5° | 0 mm | 3 | |
| 25 Sept. | Sunny | 12° /4° | 0 mm | 3 | |
| 26 Sept. | Sunny | 13° /4° | 0 mm | 3 | |
| 27 Sept. | Sunny | 14° /6° | 0 mm | 3 | |
| 28 Sept. | Sunny | 14° /9° | 0 mm | 4 | |
| 29 Sept. | Sunny | 13° /11° | 0 mm | 4 | |
| 30 Sept. | Light rain shower | 13° /7° | 2.5 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for Southwest Finland in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Southwest Finland forecast closer to your planned date for the most up-to-date weather information.
Change Month
Southwest Finland in September - FAQ
What are the expected maximum and minimum temperatures in Southwest Finland during September?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Southwest Finland during September?
Moderate rainfall is anticipated in Southwest Finland during September, with a total of 94.8 mm spread over approximately 14 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Southwest Finland during September?
The average wind speed in Southwest Finland during September is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Southwest Finland
Explore the daily rainfall trends and prepare for Southwest Finlands September weather 💧
UV exposure in Southwest Finland during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Provinces in Southwest Finland
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