Oslo
September
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.
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18
Dry days
12
Rainy days
0
Snow days
16°/9°
Temperatures
15 km/h
Avg max wind
84 %
Avg humidity
Oslo in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  20° | 2 16° | 3  14° | 4  20° | 5 24° | 6  20° | 7  21° |
| 8 21° | 9 18° | 10 18° | 11 16° | 12 15° | 13  14° | 14 14° |
| 15 15° | 16  14° | 17 14° | 18 16° | 19  16° | 20  16° | 21 17° |
| 22 16° | 23 15° | 24 12° | 25 13° | 26 12° | 27 12° | 28 12° |
| 29 12° | 30 13° |
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Temperatures trend during September in Oslo
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Cloudy | 20° /9° | 0 mm | 6 | |
| 2 Sept. | Cloudy | 16° /9° | 4.1 mm | 4 | |
| 3 Sept. | Patchy rain possible | 14° /9° | 2.3 mm | 4 | |
| 4 Sept. | Sunny | 20° /10° | 1 mm | 5 | |
| 5 Sept. | Sunny | 24° /12° | 0 mm | 6 | |
| 6 Sept. | Overcast | 20° /11° | 0 mm | 5 | |
| 7 Sept. | Mist | 21° /10° | 0.3 mm | 6 | |
| 8 Sept. | Fog | 21° /12° | 0 mm | 5 | |
| 9 Sept. | Mist | 18° /12° | 10.4 mm | 5 | |
| 10 Sept. | Mist | 18° /9° | 1.8 mm | 4 | |
| 11 Sept. | Light rain shower | 16° /8° | 0.8 mm | 4 | |
| 12 Sept. | Mist | 15° /6° | 1.4 mm | 4 | |
| 13 Sept. | Partly cloudy | 14° /4° | 0 mm | 4 | |
| 14 Sept. | Overcast | 14° /3° | 0 mm | 4 | |
| 15 Sept. | Fog | 15° /6° | 0 mm | 4 | |
| 16 Sept. | Moderate rain | 14° /9° | 9.8 mm | 3 | |
| 17 Sept. | Mist | 14° /5° | 0 mm | 4 | |
| 18 Sept. | Moderate rain | 16° /7° | 10.8 mm | 4 | |
| 19 Sept. | Moderate or heavy rain shower | 16° /7° | 4.7 mm | 4 | |
| 20 Sept. | Light drizzle | 16° /6° | 0.3 mm | 4 | |
| 21 Sept. | Light rain shower | 17° /11° | 3.6 mm | 4 | |
| 22 Sept. | Light rain shower | 16° /9° | 18.3 mm | 4 | |
| 23 Sept. | Fog | 15° /7° | 0.7 mm | 4 | |
| 24 Sept. | Partly cloudy | 12° /6° | 3.1 mm | 4 | |
| 25 Sept. | Light rain shower | 13° /9° | 8.7 mm | 3 | |
| 26 Sept. | Fog | 12° /6° | 0 mm | 3 | |
| 27 Sept. | Light rain shower | 12° /6° | 5.3 mm | 3 | |
| 28 Sept. | Light rain shower | 12° /5° | 0.8 mm | 3 | |
| 29 Sept. | Patchy rain possible | 12° /4° | 0.1 mm | 4 | |
| 30 Sept. | 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
September rainfall patterns in Oslo
Explore the daily rainfall trends and prepare for Oslos September weather 💧
UV exposure in Oslo during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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