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Weather in Oslo for September 2025

Your guide to Oslo weather in September - trends and predictions
  • In general, the average temperature in Oslo at the beginning of September is 19.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.3 °C by the end of September.

  • The climate of Oslo in September is notably wet, with an average of 12 rainy days.

  • Is September a good time to visit Oslo? check out the best time to travel to Oslo page.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
18
Dry days
Average rainy days
12
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/9°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
84 %
Avg humidity

Oslo in September average weather

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Temperatures trend during September in Oslo

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Cloudy
Cloudy
20° /9° 0 mm 6
2 Sept. Cloudy
Cloudy
16° /9° 4.1 mm 4
3 Sept. Patchy rain possible
Patchy rain possible
14° /9° 2.3 mm 4
4 Sept. Sunny
Sunny
20° /10° 1 mm 5
5 Sept. Sunny
Sunny
24° /12° 0 mm 6
6 Sept. Overcast
Overcast
20° /11° 0 mm 5
7 Sept. Mist
Mist
21° /10° 0.3 mm 6
8 Sept. Fog
Fog
21° /12° 0 mm 5
9 Sept. Mist
Mist
18° /12° 10.4 mm 5
10 Sept. Mist
Mist
18° /9° 1.8 mm 4
11 Sept. Light rain shower
Light rain shower
16° /8° 0.8 mm 4
12 Sept. Mist
Mist
15° /6° 1.4 mm 4
13 Sept. Partly cloudy
Partly cloudy
14° /4° 0 mm 4
14 Sept. Overcast
Overcast
14° /3° 0 mm 4
15 Sept. Fog
Fog
15° /6° 0 mm 4
16 Sept. Moderate rain
Moderate rain
14° /9° 9.8 mm 3
17 Sept. Mist
Mist
14° /5° 0 mm 4
18 Sept. Moderate rain
Moderate rain
16° /7° 10.8 mm 4
19 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
16° /7° 4.7 mm 4
20 Sept. Light drizzle
Light drizzle
16° /6° 0.3 mm 4
21 Sept. Light rain shower
Light rain shower
17° /11° 3.6 mm 4
22 Sept. Light rain shower
Light rain shower
16° /9° 18.3 mm 4
23 Sept. Fog
Fog
15° /7° 0.7 mm 4
24 Sept. Partly cloudy
Partly cloudy
12° /6° 3.1 mm 4
25 Sept. Light rain shower
Light rain shower
13° /9° 8.7 mm 3
26 Sept. Fog
Fog
12° /6° 0 mm 3
27 Sept. Light rain shower
Light rain shower
12° /6° 5.3 mm 3
28 Sept. Light rain shower
Light rain shower
12° /5° 0.8 mm 3
29 Sept. Patchy rain possible
Patchy rain possible
12° /4° 0.1 mm 4
30 Sept. Patchy rain possible
Patchy rain possible
13° /3° 0.2 mm 4
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Important Notice
Our weather forecast for Oslo 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 Oslo forecast closer to your planned date for the most up-to-date weather information.

Oslo in September - FAQ

What are the expected maximum and minimum temperatures in Oslo during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Oslo during September?
Significant rainfall exceeding 109.2 mm is expected in Oslo during September, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Oslo during September?
The average wind speed in Oslo during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Oslo in September?

As you prepare for your trip to Oslo in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Oslo, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Warm Clothing: Sweaters, hoodies, long pants
    • Rain Gear: Lightweight, waterproof clothing
  • Footwear
    • Waterproof Shoes
  • Accessories
    • Scarves: To protect you from the cold wind
    • Gloves/Mittens: Essential for cold weather
    • Warm Hats: Warm hats for insulation in cold weather
    • Umbrellas/Raincoats: For rainy days

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Location coordinates Where is Oslo?

Get accurate weather forecasts for Oslo, located at latitude 59.913 and longitude 10.746. Stay updated with localized weather information tailored for Oslo.

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