Weather in Marion County, Oregon for September 2026
Until now, September 2026 in Marion County is cooler than usual, with temperatures averaging 21.6 °F, this is 3.9 °F below the typical seasonal average.
Expect cooler weather in the next days in Marion County with the forecast suggesting a temperature of 24.6 °F, lower than the historical average.
In general, the average temperature in Marion County at the beginning of September is 26.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.7 °F by the end of September.
The climate of Marion County in September is notably wet, with an average of 12 rainy days, and a total of 54 mm of precipitation.
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Marion County Weather September
Temperatures trend during September in Marion County
September weather in Marion County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 28° /13° | 0.1 mm | 5 | |
| Sept. 2 |  Thundery outbreaks possible | 26° /12° | 25 mm | 5 | |
| Sept. 3 |  Mist | 26° /13° | 26.7 mm | 6 | |
| Sept. 4 | Mist | 27° /11° | 10.4 mm | 6 | |
| Sept. 5 | Mist | 29° /12° | 0.1 mm | 6 | |
| Sept. 6 |  Partly cloudy | 26° /12° | 1.5 mm | 6 | |
| Sept. 7 | Mist | 26° /12° | 0 mm | 6 | |
| Sept. 8 |  Sunny | 26° /11° | 5.2 mm | 6 | |
| Sept. 9 | Mist | 26° /12° | 1.1 mm | 6 | |
| Sept. 10 | Partly cloudy | 26° /12° | 0 mm | 6 | |
| Sept. 11 | Overcast | 21° /11° | 4.4 mm | 4 | |
| Sept. 12 | Mist | 23° /11° | 1.2 mm | 5 | |
| Sept. 13 | Mist | 23° /9° | 0.2 mm | 5 | |
| Sept. 14 |  Cloudy | 24° /10° | 0 mm | 6 | |
| Sept. 15 | Mist | 25° /9° | 0.1 mm | 5 | |
| Sept. 16 | Sunny | 29° /10° | 0 mm | 7 | |
| Sept. 17 | Sunny | 28° /12° | 0 mm | 4.6 | |
| Sept. 18 | Sunny | 25° /11° | 0 mm | 5.1 | |
| Sept. 19 | Partly cloudy | 25° /11° | 0 mm | 5 | |
| Sept. 20 | Sunny | 27° /11° | 0 mm | 5.2 | |
| Sept. 21 | Sunny | 23° /11° | 0 mm | 6 | |
| Sept. 22 | Sunny | 23° /8° | 0 mm | 6 | |
| Sept. 23 | Sunny | 28° /11° | 0 mm | 7 | |
| Sept. 24 | Sunny | 31° /14° | 0 mm | 8 | |
| Sept. 25 | Overcast | 30° /15° | 0 mm | 7 | |
| Sept. 26 | Overcast | 18° /11° | 1 mm | 4 | |
| Sept. 27 | Sunny | 18° /8° | 0 mm | 5 | |
| Sept. 28 | Sunny | 23° /6° | 0 mm | 6 | |
| Sept. 29 | Sunny | 24° /7° | 0 mm | 6 | |
| Sept. 30 | Overcast | 22° /8° | 0 mm | 6 | |
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Marion County in September - FAQ
What are the expected maximum and minimum temperatures in Marion County during September?
How much rainfall should be expected in Marion County during September?
What are the typical wind conditions in Marion County during September?
September rainfall patterns in Marion County
UV exposure in Marion County during September
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Where is Marion County?Get accurate weather forecasts for Marion County, located at latitude 44.943 and longitude -123.035. Stay updated with localized weather information tailored for Marion County.