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Weather in Oulu for September 2025

Your guide to Oulu weather in September - trends and predictions

    Temperatures

  • So far, September 2025 in Oulu is slightly warmer than the historical average by 0.9 °C.

  • The forecast for the next days in Oulu predicts a temperature of 9.4 °C, which is cooler than the historical average.

  • In general, the average temperature in Oulu at the beginning of September is 18.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 8 °C by the end of September.

    • Rain 🌧️

  • Oulu experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 175.5 mm.

Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/7°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
82 %
Avg humidity

Oulu Weather September

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

Temperatures trend during September in Oulu

See the weather trend as well as the moving average line

September weather in Oulu day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Patchy rain possible
Patchy rain possible
 17° /11° 1.7 mm 4
2 Sept. Light rain shower
Light rain shower
 19° /11° 0.8 mm 5
3 Sept. Light rain shower
Light rain shower
 17° /12° 5.9 mm 4
4 Sept. Patchy rain possible
Patchy rain possible
 19° /11° 0.7 mm 5
5 Sept. Light rain shower
Light rain shower
 19° /12° 1 mm 5
6 Sept. Partly cloudy
Partly cloudy
 19° /12° 0.1 mm 5
7 Sept. Cloudy
Cloudy
 19° /12° 1.2 mm 5
8 Sept. Mist
Mist
 19° /11° 4.2 mm 5
9 Sept. Partly cloudy
Partly cloudy
 20° /12° 0.7 mm 5
10 Sept. Overcast
Overcast
 20° /13° 0.2 mm 4
11 Sept. Partly cloudy
Partly cloudy
 20° /13° 1.7 mm 5
12 Sept. Fog
Fog
 18° /12° 0.5 mm 5
13 Sept. Mist
Mist
 15° /10° 3.1 mm 3
14 Sept. Cloudy
Cloudy
 13° /7° 1.3 mm 3
15 Sept. Overcast
Overcast
 12° /6° 0 mm 3
16 Sept. Patchy rain possible
Patchy rain possible
 15° /11° 2.7 mm 0.2
17 Sept. Patchy rain possible
Patchy rain possible
 13° /10° 3.8 mm 0.2
18 Sept. Patchy rain possible
Patchy rain possible
 12° /10° 0.4 mm 0.1
19 Sept. Moderate rain
Moderate rain
 13° /7° 5.9 mm 0.5
20 Sept. Moderate rain
Moderate rain
 10° /8° 16.4 mm 2
21 Sept. Patchy rain possible
Patchy rain possible
 10° /8° 1.1 mm 2
22 Sept. Patchy rain possible
Patchy rain possible
 9° /7° 0.5 mm 2
23 Sept. Patchy rain possible
Patchy rain possible
 5° /4° 1.6 mm 1
24 Sept. Overcast
Overcast
 7° /4° 0.1 mm 1
25 Sept. Patchy rain possible
Patchy rain possible
 7° /4° 0.1 mm 2
26 Sept. Patchy rain possible
Patchy rain possible
 6° /3° 0 mm 1
27 Sept. Sunny
Sunny
 8° /2° 0 mm 2
28 Sept. Sunny
Sunny
 9° /3° 0 mm 3
29 Sept. Patchy rain possible
Patchy rain possible
 8° /4° 1.8 mm 2
30 Sept. Light rain shower
Light rain shower
 11° /7° 3.4 mm 3
Next
Important Notice
Our weather forecast for Oulu 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 Oulu forecast closer to your planned date for the most up-to-date weather information.
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Oulu in September - FAQ

What are the expected maximum and minimum temperatures in Oulu during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Oulu during September?
Significant rainfall exceeding 175.5 mm is expected in Oulu during September, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Oulu during September?
The average wind speed in Oulu during September is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Oulu

Explore the daily rainfall trends and prepare for Oulus September weather 💧

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Get accurate weather forecasts for Oulu, located at latitude 65.012 and longitude 25.468. Stay updated with localized weather information tailored for Oulu.

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