Marion County (Salem)
September
Weather in Marion County, Oregon for September 2026
Your guide to Marion County weather in September - trends and predictions
In general, the average temperature in Marion County at the beginning of September is 29 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.4 °F by the end of September.
Marion County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 38.9 mm.
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Temperatures
Rain 🌧️
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21
Dry days
9
Rainy days
0
Snow days
24°/10°
Temperatures
13 km/h
Avg max wind
67 %
Avg humidity
Marion County Weather September
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Temperatures trend during September in Marion County
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September weather in Marion County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Fog | 29° /14° | 0.1 mm | 7 | |
| Sept. 2 |  Thundery outbreaks possible | 29° /12° | 0.7 mm | 6 | |
| Sept. 3 | Mist | 30° /13° | 0.1 mm | 7 | |
| Sept. 4 | Mist | 30° /12° | 0.3 mm | 7 | |
| Sept. 5 | Mist | 31° /13° | 0 mm | 7 | |
| Sept. 6 |  Partly cloudy | 28° /13° | 0 mm | 7 | |
| Sept. 7 | Mist | 26° /13° | 0 mm | 6 | |
| Sept. 8 |  Sunny | 25° /12° | 6.9 mm | 6 | |
| Sept. 9 | Mist | 26° /12° | 1.4 mm | 6 | |
| Sept. 10 | Partly cloudy | 25° /12° | 0 mm | 6 | |
| Sept. 11 |  Overcast | 20° /12° | 5.9 mm | 4 | |
| Sept. 12 | Mist | 24° /11° | 0.1 mm | 5 | |
| Sept. 13 | Mist | 24° /10° | 0 mm | 6 | |
| Sept. 14 | Mist | 25° /10° | 0 mm | 6 | |
| Sept. 15 | Mist | 27° /9° | 0 mm | 6 | |
| Sept. 16 | Partly cloudy | 30° /10° | 0 mm | 7 | |
| Sept. 17 | Overcast | 23° /11° | 4.9 mm | 5 | |
| Sept. 18 | Overcast | 23° /11° | 1 mm | 5 | |
| Sept. 19 | Mist | 24° /9° | 0 mm | 6 | |
| Sept. 20 |  Light rain shower | 23° /9° | 0.1 mm | 5 | |
| Sept. 21 | Partly cloudy | 23° /8° | 3.8 mm | 6 | |
| Sept. 22 | Sunny | 24° /8° | 0 mm | 6 | |
| Sept. 23 | Patchy rain possible | 26° /10° | 0.1 mm | 6 | |
| Sept. 24 |  Light drizzle | 27° /12° | 1.3 mm | 6 | |
| Sept. 25 |  Moderate or heavy rain with thunder | 19° /11° | 2.9 mm | 5 | |
| Sept. 26 | Mist | 22° /9° | 2.4 mm | 5 | |
| Sept. 27 | Light rain shower | 22° /10° | 5.3 mm | 5 | |
| Sept. 28 | Patchy light rain | 21° /9° | 0.7 mm | 5 | |
| Sept. 29 | Patchy rain possible | 18° /10° | 11.2 mm | 4 | |
| Sept. 30 | Sunny | 21° /6° | 4.8 mm | 5 | |
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Important Notice
Our weather forecast for Marion County 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 Marion County forecast closer to your planned date for the most up-to-date weather information.
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Marion County in September - FAQ
What are the expected maximum and minimum temperatures in Marion County during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Marion County during September?
In September, Marion County can expect light to moderate rainfall, totaling 38.9 mm across approximately 9 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Marion County during September?
The average wind speed in Marion County during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Marion County
Explore the daily rainfall trends and prepare for Marion Countys September weather 💧
UV exposure in Marion County during September
Stay informed about UV levels for safe outdoor activities throughout the month of 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.
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