Oslo
September
Weather in Oslo for September 2025
Your guide to Oslo weather in September - trends and predictions
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Until now, September 2025 in Oslo is slightly cooler than the historical average by -0.8 °C.
Expect cooler weather in the next days in Oslo with the forecast suggesting a temperature of 13.3 °C, lower than the historical average.
In general, the average temperature in Oslo at the beginning of September is 18.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12.1 °C by the end of September.
Oslo experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 93 mm.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
9
Dry days
21
Rainy days
0
Snow days
15°/7°
Temperatures
11 km/h
Avg max wind
79 %
Avg humidity
Oslo Weather September
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Temperatures trend during September in Oslo
See the weather trend as well as the moving average line
September weather in Oslo day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 20° /9° | 1.5 mm | 5 | |
| 2 Sept. | Sunny | 17° /9° | 2.4 mm | 4 | |
| 3 Sept. |  Patchy rain possible | 15° /9° | 2.1 mm | 4 | |
| 4 Sept. | Light rain shower | 17° /9° | 4.3 mm | 4 | |
| 5 Sept. |  Cloudy | 19° /10° | 0.4 mm | 5 | |
| 6 Sept. | Sunny | 20° /9° | 0.3 mm | 5 | |
| 7 Sept. |  Partly cloudy | 21° /9° | 0.1 mm | 5 | |
| 8 Sept. | Patchy rain possible | 20° /10° | 0.1 mm | 5 | |
| 9 Sept. | Light rain shower | 18° /10° | 4.6 mm | 4 | |
| 10 Sept. | Light rain shower | 17° /10° | 2.6 mm | 4 | |
| 11 Sept. | Patchy rain possible | 16° /9° | 3.5 mm | 4 | |
| 12 Sept. | Light rain shower | 15° /8° | 7.3 mm | 3 | |
| 13 Sept. |  Overcast | 14° /6° | 6.1 mm | 3 | |
| 14 Sept. | Cloudy | 13° /5° | 4.3 mm | 3 | |
| 15 Sept. | Patchy rain possible | 14° /5° | 0.2 mm | 4 | |
| 16 Sept. |  Moderate rain | 14° /10° | 9.7 mm | 0.2 | |
| 17 Sept. | Sunny | 19° /8° | 0 mm | 0.6 | |
| 18 Sept. | Partly cloudy | 17° /8° | 0 mm | 0.5 | |
| 19 Sept. | Patchy rain possible | 18° /11° | 0.8 mm | 0.4 | |
| 20 Sept. | Sunny | 14° /8° | 0 mm | 4 | |
| 21 Sept. | Patchy rain possible | 9° /6° | 2.4 mm | 2 | |
| 22 Sept. | Patchy rain possible | 11° /4° | 2.2 mm | 2 | |
| 23 Sept. | Partly cloudy | 11° /2° | 0 mm | 3 | |
| 24 Sept. | Patchy rain possible | 13° /4° | 0.4 mm | 2 | |
| 25 Sept. | Patchy rain possible | 12° /4° | 0.2 mm | 2 | |
| 26 Sept. | Partly cloudy | 12° /2° | 0 mm | 3 | |
| 27 Sept. | Partly cloudy | 11° /5° | 0 mm | 3 | |
| 28 Sept. | Patchy rain possible | 14° /3° | 0.1 mm | 2 | |
| 29 Sept. | Patchy rain possible | 11° /10° | 1.6 mm | 3 | |
| 30 Sept. | Patchy rain possible | 12° /4° | 6.2 mm | 3 | |
| Next | |||||
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.
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Oslo in September - FAQ
What are the expected maximum and minimum temperatures in Oslo during September?
During September, expect a variety of temperatures with highs around 15° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in Oslo during September?
Moderate rainfall is anticipated in Oslo during September, with a total of 93 mm spread over approximately 21 days. Considering plans for rainy days is advisable.
Will it snow in Oslo in September 2025?
Oslo typically sees 0.0075 cm of snowfall during September.
What are the typical wind conditions in Oslo during September?
The average wind speed in Oslo during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
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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