Southwest Finland (Turku)
September
Weather in Southwest Finland for September 2026
Your guide to Southwest Finland weather in September - trends and predictions
Until now, September 2026 in Southwest Finland is slightly cooler than the historical average by 1.5 °C.
Expect cooler weather in the next days in Southwest Finland with the forecast suggesting a temperature of 14.6 °C, lower than the historical average.
In general, the average temperature in Southwest Finland at the beginning of September is 18.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15 °C by the end of September.
Southwest Finland in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 84.9 mm.
Temperatures
Rain 🌧️
11
Dry days
19
Rainy days
0
Snow days
17°/11°
Temperatures
20 km/h
Avg max wind
80 %
Avg humidity
Southwest Finland Weather September
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What’s the Weather Like in Southwest Finland This September?
Discover the average temperatures and weather trends across Southwest Finland’s cities this September.
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 | 18° /11° | 8.6 mm | 4 | |
| 2 Sept. | Light rain shower | 17° /10° | 2.6 mm | 3 | |
| 3 Sept. |  Cloudy | 17° /12° | 1.2 mm | 4 | |
| 4 Sept. |  Sunny | 20° /12° | 0 mm | 4 | |
| 5 Sept. |  Overcast | 20° /12° | 0.1 mm | 4 | |
| 6 Sept. | Sunny | 20° /11° | 0.2 mm | 5 | |
| 7 Sept. | Sunny | 19° /11° | 1 mm | 4 | |
| 8 Sept. |  Mist | 20° /14° | 1.7 mm | 4 | |
| 9 Sept. |  Partly cloudy | 20° /14° | 6.2 mm | 4 | |
| 10 Sept. | Overcast | 19° /13° | 3.4 mm | 4 | |
| 11 Sept. | Patchy rain possible | 19° /12° | 1.5 mm | 4 | |
| 12 Sept. | Overcast | 17° /12° | 3.4 mm | 3 | |
| 13 Sept. | Mist | 17° /10° | 1.2 mm | 3 | |
| 14 Sept. | Partly cloudy | 16° /9° | 9.5 mm | 3 | |
| 15 Sept. | Cloudy | 16° /8° | 4.4 mm | 3 | |
| 16 Sept. | Patchy rain possible | 16° /12° | 6.5 mm | 3 | |
| 17 Sept. | Light rain shower | 16° /10° | 3.9 mm | 3 | |
| 18 Sept. | Overcast | 15° /9° | 2.5 mm | 3 | |
| 19 Sept. | Patchy rain possible | 16° /10° | 3 mm | 3 | |
| 20 Sept. | Patchy rain possible | 16° /11° | 4.4 mm | 3 | |
| 21 Sept. | Cloudy | 17° /10° | 3 mm | 4 | |
| 22 Sept. | Patchy rain possible | 14° /9° | 0.3 mm | 3 | |
| 23 Sept. | Patchy rain possible | 14° /8° | 5.7 mm | 3 | |
| 24 Sept. | Partly cloudy | 14° /8° | 0.7 mm | 4 | |
| 25 Sept. | Patchy rain possible | 15° /10° | 1.1 mm | 1.5 | |
| 26 Sept. | Patchy rain possible | 14° /9° | 1.6 mm | 1.3 | |
| 27 Sept. | Patchy rain possible | 15° /11° | 1.8 mm | 1.6 | |
| 28 Sept. | Overcast | 15° /9° | 0.2 mm | 5 | |
| 29 Sept. | Mist | 16° /11° | 0 mm | 4 | |
| 30 Sept. | Mist | 16° /11° | 0 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 84.9 mm spread over approximately 19 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 20 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 💧
Typically, Southwest Finland has 19 rainy days in September with a total of 84.9 mm of rainfall.
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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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