Oregon (Portland)
September
Weather in Oregon for September 2026
Your guide to Oregon weather in September - trends and predictions
Until now, September 2026 in Oregon is cooler than usual, with temperatures averaging 20.9 °F, this is 4.1 °F below the typical seasonal average.
The forecast for the next days in Oregon predicts temperatures to be around 24 °F, close to the historical average.
In general, the average temperature in Oregon at the beginning of September is 26.3 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 23.4 °F by the end of September.
With an average of 5 rainy days, Oregon experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
25
Dry days
5
Rainy days
0
Snow days
24°/13°
Temperatures
10 km/h
Avg max wind
63 %
Avg humidity
Oregon Weather September
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What’s the Weather Like in Oregon This September?
Discover the average temperatures and weather trends across Oregon’s cities this September.
Temperatures trend during September in Oregon
See the weather trend as well as the moving average line
September weather in Oregon day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 27° /14° | 0.1 mm | 5 | |
| Sept. 2 |  Cloudy | 26° /14° | 13.1 mm | 6 | |
| Sept. 3 |  Patchy rain possible | 25° /15° | 3.6 mm | 5 | |
| Sept. 4 | Overcast | 25° /13° | 6.4 mm | 5 | |
| Sept. 5 |  Sunny | 30° /14° | 0 mm | 7 | |
| Sept. 6 |  Partly cloudy | 26° /15° | 10.1 mm | 6 | |
| Sept. 7 | Overcast | 25° /14° | 0.1 mm | 5 | |
| Sept. 8 | Sunny | 27° /14° | 3.9 mm | 6 | |
| Sept. 9 | Cloudy | 27° /13° | 7.6 mm | 6 | |
| Sept. 10 | Overcast | 25° /13° | 0 mm | 6 | |
| Sept. 11 | Overcast | 20° /12° | 2.8 mm | 4 | |
| Sept. 12 | Overcast | 21° /12° | 1.2 mm | 4 | |
| Sept. 13 | Overcast | 22° /11° | 0.4 mm | 5 | |
| Sept. 14 | Sunny | 24° /11° | 1.2 mm | 6 | |
| Sept. 15 | Sunny | 25° /11° | 0.2 mm | 5 | |
| Sept. 16 | Sunny | 29° /13° | 0 mm | 7 | |
| Sept. 17 | Sunny | 28° /14° | 0 mm | 4.5 | |
| Sept. 18 | Sunny | 25° /13° | 0 mm | 4.9 | |
| Sept. 19 | Partly cloudy | 26° /12° | 0 mm | 4.9 | |
| Sept. 20 | Sunny | 27° /12° | 0 mm | 4.9 | |
| Sept. 21 | Sunny | 21° /12° | 0 mm | 4.9 | |
| Sept. 22 | Sunny | 23° /10° | 0 mm | 6 | |
| Sept. 23 | Sunny | 28° /12° | 0 mm | 7 | |
| Sept. 24 | Sunny | 31° /16° | 0 mm | 8 | |
| Sept. 25 | Overcast | 29° /18° | 0 mm | 7 | |
| Sept. 26 | Patchy rain possible | 18° /11° | 0.5 mm | 4 | |
| Sept. 27 | Overcast | 18° /10° | 0 mm | 5 | |
| Sept. 28 | Sunny | 22° /7° | 0 mm | 6 | |
| Sept. 29 | Sunny | 23° /8° | 0 mm | 6 | |
| Sept. 30 | Overcast | 23° /10° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Oregon 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 Oregon forecast closer to your planned date for the most up-to-date weather information.
Change Month
Oregon in September - FAQ
What are the expected maximum and minimum temperatures in Oregon during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Oregon during September?
Moderate rainfall is anticipated in Oregon during September, with a total of 61.9 mm spread over approximately 5 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Oregon during September?
The average wind speed in Oregon during September is 10 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Oregon
Explore the daily rainfall trends and prepare for Oregons September weather 💧
Typically, Oregon has 5 rainy days in September with a total of 61.9 mm of rainfall.
UV exposure in Oregon during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Oregon?Get accurate weather forecasts for Oregon, located at latitude 45.523 and longitude -122.676. Stay updated with localized weather information tailored for Oregon.
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