Ostrobothnia (Vaasa)
September
Weather in Ostrobothnia for September 2026
Your guide to Ostrobothnia weather in September - trends and predictions
In general, the average temperature in Ostrobothnia at the beginning of September is 18.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.7 °C by the end of September.
The climate of Ostrobothnia in September is notably wet, with an average of 14 rainy days, and a total of 226.4 mm of precipitation.
Temperatures
Rain 🌧️
16
Dry days
14
Rainy days
0
Snow days
17°/9°
Temperatures
23 km/h
Avg max wind
80 %
Avg humidity
Ostrobothnia Weather September
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Temperatures trend during September in Ostrobothnia
See the weather trend as well as the moving average line
September weather in Ostrobothnia day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 17° /12° | 11.2 mm | 4 | |
| 2 Sept. | Light rain shower | 18° /11° | 4.2 mm | 4 | |
| 3 Sept. | Patchy rain possible | 17° /11° | 4.2 mm | 4 | |
| 4 Sept. |  Overcast | 19° /12° | 0 mm | 5 | |
| 5 Sept. |  Light rain | 19° /13° | 3.4 mm | 5 | |
| 6 Sept. |  Sunny | 19° /13° | 0 mm | 5 | |
| 7 Sept. |  Partly cloudy | 18° /12° | 0.8 mm | 5 | |
| 8 Sept. | Patchy rain possible | 19° /12° | 0.1 mm | 5 | |
| 9 Sept. | Sunny | 20° /13° | 1.8 mm | 5 | |
| 10 Sept. | Overcast | 19° /13° | 0.4 mm | 4 | |
| 11 Sept. | Patchy rain possible | 19° /12° | 0.1 mm | 5 | |
| 12 Sept. | Overcast | 17° /12° | 1.5 mm | 4 | |
| 13 Sept. | Patchy rain possible | 15° /10° | 0.1 mm | 3 | |
| 14 Sept. | Partly cloudy | 14° /9° | 0 mm | 4 | |
| 15 Sept. | Overcast | 13° /8° | 4.5 mm | 3 | |
| 16 Sept. | Light rain shower | 15° /9° | 5.9 mm | 4 | |
| 17 Sept. | Light rain | 14° /9° | 5.4 mm | 4 | |
| 18 Sept. | Overcast | 14° /9° | 0.1 mm | 4 | |
| 19 Sept. | Light rain | 15° /9° | 1.4 mm | 4 | |
| 20 Sept. | Light rain shower | 14° /9° | 2.5 mm | 3 | |
| 21 Sept. | Light drizzle | 14° /8° | 2.1 mm | 4 | |
| 22 Sept. | Light rain shower | 14° /10° | 4.4 mm | 4 | |
| 23 Sept. | Patchy rain possible | 14° /8° | 6.6 mm | 3 | |
| 24 Sept. | Partly cloudy | 13° /9° | 0.7 mm | 3 | |
| 25 Sept. | Light drizzle | 14° /10° | 1.4 mm | 4 | |
| 26 Sept. | Patchy rain possible | 13° /9° | 0.8 mm | 3 | |
| 27 Sept. | Light rain shower | 14° /8° | 11.1 mm | 3 | |
| 28 Sept. |  Mist | 12° /8° | 0.2 mm | 3 | |
| 29 Sept. | Patchy rain possible | 12° /8° | 0.5 mm | 3 | |
| 30 Sept. |  Thundery outbreaks possible | 11° /8° | 0.3 mm | 3 | |
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Important Notice
Our weather forecast for Ostrobothnia 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 Ostrobothnia forecast closer to your planned date for the most up-to-date weather information.
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Ostrobothnia in September - FAQ
What are the expected maximum and minimum temperatures in Ostrobothnia during September?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Ostrobothnia during September?
Significant rainfall exceeding 226.4 mm is expected in Ostrobothnia during September, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Ostrobothnia during September?
The average wind speed in Ostrobothnia during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Ostrobothnia
Explore the daily rainfall trends and prepare for Ostrobothnias September weather 💧
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