Oregon (Portland)
September
Weather in Oregon for September 2025
Your guide to Oregon weather in September - trends and predictions
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Until now, September 2025 in Oregon is slightly cooler than the historical average by -1.2 °F.
The forecast for the next days in Oregon predicts a temperature of 21.3 °F, which is cooler than the historical average.
In general, the average temperature in Oregon at the beginning of September is 28.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.6 °F by the end of September.
Oregon experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 37 mm.
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Temperatures
Rain 🌧️
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22
Dry days
8
Rainy days
0
Snow days
24°/13°
Temperatures
11 km/h
Avg max wind
62 %
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 |  Fog | 28° /15° | 0.1 mm | 6 | |
| Sept. 2 |  Cloudy | 28° /15° | 0.1 mm | 7 | |
| Sept. 3 |  Patchy rain possible | 27° /16° | 0.8 mm | 6 | |
| Sept. 4 |  Overcast | 28° /13° | 0.7 mm | 6 | |
| Sept. 5 | Overcast | 32° /16° | 0 mm | 8 | |
| Sept. 6 |  Partly cloudy | 29° /16° | 0 mm | 7 | |
| Sept. 7 | Overcast | 25° /15° | 0 mm | 6 | |
| Sept. 8 | Overcast | 26° /15° | 5.2 mm | 6 | |
| Sept. 9 | Cloudy | 26° /13° | 10.2 mm | 6 | |
| Sept. 10 |  Sunny | 25° /14° | 0 mm | 6 | |
| Sept. 11 | Overcast | 20° /13° | 3.7 mm | 4 | |
| Sept. 12 | Cloudy | 21° /12° | 0.2 mm | 5 | |
| Sept. 13 | Overcast | 24° /11° | 0 mm | 6 | |
| Sept. 14 | Sunny | 25° /12° | 1.4 mm | 6 | |
| Sept. 15 | Sunny | 26° /10° | 0 mm | 1.4 | |
| Sept. 16 | Sunny | 34° /17° | 0 mm | 1.4 | |
| Sept. 17 | Sunny | 25° /16° | 0 mm | 1.4 | |
| Sept. 18 | Sunny | 28° /13° | 0 mm | 1.2 | |
| Sept. 19 | Partly cloudy | 24° /15° | 0.1 mm | 0 | |
| Sept. 20 | Sunny | 24° /15° | 0 mm | 5 | |
| Sept. 21 | Patchy rain possible | 18° /14° | 0.2 mm | 4 | |
| Sept. 22 | Patchy rain possible | 25° /16° | 0.2 mm | 4 | |
| Sept. 23 | Patchy rain possible | 18° /14° | 1.1 mm | 4 | |
| Sept. 24 | Patchy rain possible | 15° /11° | 1.6 mm | 3 | |
| Sept. 25 | Patchy rain possible | 12° /11° | 3.7 mm | 3 | |
| Sept. 26 | Patchy rain possible | 16° /10° | 4.6 mm | 3 | |
| Sept. 27 | Patchy rain possible | 16° /8° | 0.1 mm | 3 | |
| Sept. 28 | Partly cloudy | 17° /9° | 0 mm | 4 | |
| Sept. 29 | Overcast | 19° /9° | 0 mm | 4 | |
| Sept. 30 | Partly cloudy | 21° /8° | 0 mm | 6 | |
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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.
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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?
In September, Oregon can expect light to moderate rainfall, totaling 37 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Oregon during September?
The average wind speed in Oregon during September is 11 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 💧
UV exposure in Oregon during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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