South Ostrobothnia (Lappajärvi)
September
Weather in South Ostrobothnia for September 2025
Your guide to South Ostrobothnia weather in September - trends and predictions
In general, the average temperature in South Ostrobothnia at the beginning of September is 21.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 11.6 °C by the end of September.
South Ostrobothnia in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 65 mm.
Temperatures
Rain 🌧️
12
Dry days
18
Rainy days
0
Snow days
16°/8°
Temperatures
15 km/h
Avg max wind
77 %
Avg humidity
South Ostrobothnia Weather September
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  17° | 2 19° | 3 19° | 4  23° | 5  25° | 6 25° | 7 22° |
| 8 23° | 9  23° | 10 20° | 11  19° | 12 16° | 13 16° | 14 12° |
| 15 15° | 16 17° | 17 15° | 18 17° | 19 21° | 20 15° | 21  11° |
| 22 11° | 23  11° | 24 16° | 25 16° | 26 12° | 27 11° | 28 9° |
| 29 8° | 30 9° |
You can click on date
Access South Ostrobothnia weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in South Ostrobothnia
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Patchy rain possible | 17° /11° | 4.4 mm | 4 | |
| 2 Sept. | Patchy rain possible | 19° /9° | 0.6 mm | 4 | |
| 3 Sept. | Patchy rain possible | 19° /10° | 0.4 mm | 4 | |
| 4 Sept. | Sunny | 23° /10° | 0 mm | 6 | |
| 5 Sept. | Overcast | 25° /14° | 0 mm | 6 | |
| 6 Sept. | Sunny | 25° /13° | 0 mm | 7 | |
| 7 Sept. | Sunny | 22° /11° | 0 mm | 6 | |
| 8 Sept. | Patchy rain possible | 23° /12° | 0.3 mm | 5 | |
| 9 Sept. | Partly cloudy | 23° /13° | 0 mm | 6 | |
| 10 Sept. | Overcast | 20° /15° | 1.2 mm | 5 | |
| 11 Sept. | Heavy rain at times | 19° /13° | 7 mm | 4 | |
| 12 Sept. | Heavy rain at times | 16° /12° | 3.4 mm | 4 | |
| 13 Sept. | Overcast | 16° /10° | 0 mm | 4 | |
| 14 Sept. | Patchy rain possible | 12° /9° | 2.8 mm | 3 | |
| 15 Sept. | Patchy rain possible | 15° /6° | 2.8 mm | 4 | |
| 16 Sept. | Sunny | 17° /4° | 0.4 mm | 5 | |
| 17 Sept. | Patchy rain possible | 15° /8° | 6.3 mm | 4 | |
| 18 Sept. | Partly cloudy | 17° /8° | 0 mm | 5 | |
| 19 Sept. | Sunny | 21° /9° | 0 mm | 6 | |
| 20 Sept. | Overcast | 15° /8° | 0 mm | 4 | |
| 21 Sept. | Cloudy | 11° /4° | 0 mm | 3 | |
| 22 Sept. | Overcast | 11° /3° | 1.1 mm | 3 | |
| 23 Sept. | Moderate or heavy rain shower | 11° /5° | 12.8 mm | 3 | |
| 24 Sept. | Moderate or heavy rain shower | 16° /8° | 2.4 mm | 4 | |
| 25 Sept. | Moderate rain at times | 16° /11° | 1.5 mm | 4 | |
| 26 Sept. | Patchy rain possible | 12° /6° | 0.9 mm | 3 | |
| 27 Sept. | Moderate or heavy rain shower | 11° /5° | 15.9 mm | 3 | |
| 28 Sept. | Patchy rain possible | 9° /2° | 0.8 mm | 2 | |
| 29 Sept. | Sunny | 8° /1° | 0 mm | 3 | |
| 30 Sept. | Partly cloudy | 9° /1° | 0 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for South 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 South Ostrobothnia forecast closer to your planned date for the most up-to-date weather information.
South Ostrobothnia in September - FAQ
What are the expected maximum and minimum temperatures in South Ostrobothnia during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in South Ostrobothnia during September?
Moderate rainfall is anticipated in South Ostrobothnia during September, with a total of 65 mm spread over approximately 18 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in South Ostrobothnia during September?
The average wind speed in South Ostrobothnia during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in South Ostrobothnia
Explore the daily rainfall trends and prepare for South Ostrobothnias September weather 💧
UV exposure in South Ostrobothnia during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Provinces in South Ostrobothnia
Select a province for an accurate weather forecast
Top locations in South Ostrobothnia
Select a location for an accurate weather forecast
More Locations Quick links
More South Ostrobothnia weather pages
You are here
Where is South Ostrobothnia?Get accurate weather forecasts for South Ostrobothnia, located at latitude 63.2 and longitude 23.633. Stay updated with localized weather information tailored for South Ostrobothnia.
Found a mistake?
We appreciate your attention to details. Tell us here.