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South Ostrobothnia (Lappajärvi)
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Weather in South Ostrobothnia for September 2025

Your guide to South Ostrobothnia weather in September - trends and predictions

    Snow Forecast ❄️

  • Snowfall in South Ostrobothnia during September is quite rare, with fewer than 2 snowy days on average.
    According to South Ostrobothnia snow forecast for September 2025, 1 snowy day is expected until the end of the month at Sunday, 28 September.

    • Temperatures

  • Until now, September 2025 in South Ostrobothnia has been nearly identical to the historical average, with a temperature of 20.4 °C (showing only a slight deviation of -0.1 °C).

  • An exceptional deviation from the historical average is forecasted for next days of September 2025 in South Ostrobothnia with the forecasted temperature being 9.7 °C, much lower than usual.

  • In general, the average temperature in South Ostrobothnia at the beginning of September is 21.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 6.4 °C by the end of September.

    • Rain 🌧️

  • The climate of South Ostrobothnia in September is notably wet, with an average of 12 rainy days, and a total of 65 mm of precipitation.

Average dry days
18
Dry days
Average rainy days
12
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/8°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
77 %
Avg humidity

South Ostrobothnia Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
19°
2
Patchy rain possible
20°
3
Patchy rain possible
18°
4
Sunny
23°
5
Overcast
24°
6
Sunny
25°
7
Sunny
23°
8
Patchy rain possible
22°
9
Partly cloudy
22°
10
Overcast
21°
11
Heavy rain at times
21°
12
Heavy rain at times
17°
13
Overcast
17°
14
Patchy rain possible
15°
15
Patchy rain possible
15°
16
Patchy rain possible
16°
17
Patchy rain possible
13°
18
Patchy rain possible
13°
19
Patchy rain possible
15°
20
Moderate rain
14°
21
Patchy rain possible
9°
22
Partly cloudy
13°
23
Moderate rain
7°
24
Patchy rain possible
8°
25
Cloudy
8°
26
Patchy rain possible
5°
27
Partly cloudy
6°
28
Patchy rain possible
3°
29
Mist
6°
30
Partly cloudy
9°

Temperatures trend during September in South Ostrobothnia

See the weather trend as well as the moving average line

September weather in South Ostrobothnia day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
1 Sept. Patchy rain possible
Patchy rain possible
 19° /10° 2.2 mm 0 cm
2 Sept. Patchy rain possible
Patchy rain possible
 20° /9° 0.3 mm 0 cm
3 Sept. Patchy rain possible
Patchy rain possible
 18° /11° 5.4 mm 0 cm
4 Sept. Sunny
Sunny
 23° /11° 0 mm 0 cm
5 Sept. Overcast
Overcast
 24° /13° 0.1 mm 0 cm
6 Sept. Sunny
Sunny
 25° /13° 0 mm 0 cm
7 Sept. Sunny
Sunny
 23° /12° 6.4 mm 0 cm
8 Sept. Patchy rain possible
Patchy rain possible
 22° /12° 1.3 mm 0 cm
9 Sept. Partly cloudy
Partly cloudy
 22° /13° 3.9 mm 0 cm
10 Sept. Overcast
Overcast
 21° /14° 0.6 mm 0 cm
11 Sept. Heavy rain at times
Heavy rain at times
 21° /12° 3.5 mm 0 cm
12 Sept. Heavy rain at times
Heavy rain at times
 17° /12° 3.2 mm 0 cm
13 Sept. Overcast
Overcast
 17° /10° 0.4 mm 0 cm
14 Sept. Patchy rain possible
Patchy rain possible
 15° /9° 1.6 mm 0 cm
15 Sept. Patchy rain possible
Patchy rain possible
 15° /6° 2.8 mm 0 cm
16 Sept. Patchy rain possible
Patchy rain possible
 16° /11° 2.8 mm 0 cm
17 Sept. Patchy rain possible
Patchy rain possible
 13° /9° 3.6 mm 0 cm
18 Sept. Patchy rain possible
Patchy rain possible
 13° /8° 1.5 mm 0 cm
19 Sept. Patchy rain possible
Patchy rain possible
 15° /5° 0.3 mm 0 cm
20 Sept. Moderate rain
Moderate rain
 14° /8° 7 mm 0 cm
21 Sept. Patchy rain possible
Patchy rain possible
 9° /6° 2.1 mm 0 cm
22 Sept. Partly cloudy
Partly cloudy
 13° /6° 0.1 mm 0 cm
23 Sept. Moderate rain
Moderate rain
 7° /6° 5.4 mm 0 cm
24 Sept. Patchy rain possible
Patchy rain possible
 8° /5° 0.2 mm 0 cm
25 Sept. Cloudy
Cloudy
 8° /1° 0 mm 0 cm
26 Sept. Patchy rain possible
Patchy rain possible
 5° /-1° 0 mm 0 cm
27 Sept. Partly cloudy
Partly cloudy
 6° /-1° 0 mm 0 cm
28 Sept. Patchy rain possible
Patchy rain possible
 3° /2° 2.2 mm 0.8 cm
29 Sept. Mist
Mist
 6° /3° 0.1 mm 0 cm
30 Sept. Partly cloudy
Partly cloudy
 9° /1° 0 mm 0 cm
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.
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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 12 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.

South Ostrobothnia snow forecast September 2025

Track daily snowfall levels and discover South Ostrobothnia’s snowy potential this September ❄️

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
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Järviseutu
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Lappajärvi
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Location coordinates 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.

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