Southwest Finland (Turku)
September
Weather in Southwest Finland for September 2025
Your guide to Southwest Finland weather in September - trends and predictions
In general, the average temperature in Southwest Finland at the beginning of September is 18.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.3 °C by the end of September.
With an average of 5 rainy days, Southwest Finland experiences minimal rainfall in September.
Temperatures
Rain 🌧️
25
Dry days
5
Rainy days
0
Snow days
18°/10°
Temperatures
21 km/h
Avg max wind
81 %
Avg humidity
Southwest Finland Weather September
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  16° | 2 15° | 3  18° | 4 20° | 5  21° | 6 19° | 7  19° |
| 8  21° | 9 20° | 10 19° | 11 19° | 12 17° | 13 18° | 14 14° |
| 15 16° | 16 17° | 17 16° | 18 15° | 19 17° | 20 17° | 21 17° |
| 22 15° | 23  16° | 24 15° | 25 15° | 26 15° | 27 16° | 28 13° |
| 29 13° | 30 13° |
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Temperatures trend during September in Southwest Finland
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 16° /12° | 16.3 mm | 4 | |
| 2 Sept. | Light rain shower | 15° /10° | 5.1 mm | 4 | |
| 3 Sept. | Cloudy | 18° /11° | 0.1 mm | 5 | |
| 4 Sept. | Cloudy | 20° /13° | 0 mm | 5 | |
| 5 Sept. | Overcast | 21° /13° | 0 mm | 5 | |
| 6 Sept. | Cloudy | 19° /11° | 0 mm | 5 | |
| 7 Sept. | Partly cloudy | 19° /11° | 0 mm | 6 | |
| 8 Sept. | Mist | 21° /14° | 0 mm | 6 | |
| 9 Sept. | Partly cloudy | 20° /15° | 0 mm | 6 | |
| 10 Sept. | Overcast | 19° /14° | 2.6 mm | 4 | |
| 11 Sept. | Mist | 19° /14° | 2.7 mm | 5 | |
| 12 Sept. | Overcast | 17° /13° | 1.4 mm | 4 | |
| 13 Sept. | Mist | 18° /11° | 0.1 mm | 4 | |
| 14 Sept. | Partly cloudy | 14° /9° | 17.8 mm | 4 | |
| 15 Sept. | Cloudy | 16° /7° | 0 mm | 5 | |
| 16 Sept. | Patchy rain possible | 17° /11° | 0.6 mm | 4 | |
| 17 Sept. | Light rain shower | 16° /9° | 0.6 mm | 4 | |
| 18 Sept. | Overcast | 15° /7° | 0 mm | 4 | |
| 19 Sept. | Light rain shower | 17° /10° | 3 mm | 5 | |
| 20 Sept. | Light rain shower | 17° /11° | 4.4 mm | 5 | |
| 21 Sept. | Cloudy | 17° /10° | 0 mm | 5 | |
| 22 Sept. | Partly cloudy | 15° /9° | 0.3 mm | 4 | |
| 23 Sept. | Light rain | 16° /10° | 11 mm | 4 | |
| 24 Sept. | Patchy rain possible | 15° /11° | 0.7 mm | 4 | |
| 25 Sept. | Cloudy | 15° /12° | 2.4 mm | 4 | |
| 26 Sept. | Partly cloudy | 15° /12° | 5.6 mm | 4 | |
| 27 Sept. | Light rain shower | 16° /12° | 12.3 mm | 4 | |
| 28 Sept. | Overcast | 13° /9° | 4.4 mm | 4 | |
| 29 Sept. | Mist | 13° /9° | 0.8 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.
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 18° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Southwest Finland during September?
Significant rainfall exceeding 189.5 mm is expected in Southwest Finland during September, occurring over more than 5 days. Preparing for wet conditions is recommended in your planning.
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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Where is Southwest Finland?Get accurate weather forecasts for Southwest Finland, located at latitude 60.451 and longitude 22.269. Stay updated with localized weather information tailored for Southwest Finland.
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