Umatilla County (Pendleton)
September
Weather in Umatilla County, Oregon for September 2027
Your guide to Umatilla County weather in September - trends and predictions
Umatilla County experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 70.9 mm.
Is September a good time to visit Umatilla County? check out the best time to travel to Umatilla County page.
✨ Is September a good time to visit Umatilla County? – Ask the AI Weatherman
Rain 🌧️
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24
Dry days
6
Rainy days
0
Snow days
25°/13°
Temperatures
18 km/h
Avg max wind
45 %
Avg humidity
Umatilla County Weather September
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Temperatures trend during September in Umatilla County
See the weather trend as well as the moving average line
September weather in Umatilla County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 32° /15° | 0 mm | 5 | |
| Sept. 2 |  Patchy rain possible | 32° /16° | 2.1 mm | 5 | |
| Sept. 3 |  Heavy rain | 28° /18° | 38.7 mm | 5 | |
| Sept. 4 |  Partly cloudy | 30° /15° | 0.9 mm | 6.8 | |
| Sept. 5 | Partly cloudy | 29° /16° | 0 mm | 6.7 | |
| Sept. 6 |  Light rain | 25° /14° | 9.8 mm | 5 | |
| Sept. 7 | Sunny | 27° /15° | 0.4 mm | 6 | |
| Sept. 8 |  Overcast | 27° /13° | 0 mm | 6.4 | |
| Sept. 9 |  Thundery outbreaks possible | 24° /13° | 1.4 mm | 6 | |
| Sept. 10 | Thundery outbreaks possible | 28° /13° | 0 mm | 5 | |
| Sept. 11 | Thundery outbreaks possible | 25° /14° | 4 mm | 5 | |
| Sept. 12 | Light rain | 25° /11° | 3.5 mm | 4 | |
| Sept. 13 | Light rain | 23° /13° | 3.4 mm | 5 | |
| Sept. 14 | Patchy light rain | 19° /12° | 0.7 mm | 5 | |
| Sept. 15 | Sunny | 22° /10° | 0.1 mm | 4 | |
| Sept. 16 | Sunny | 25° /12° | 0.2 mm | 5.7 | |
| Sept. 17 | Patchy rain possible | 25° /13° | 2.2 mm | 5 | |
| Sept. 18 | Sunny | 26° /15° | 0 mm | 5.5 | |
| Sept. 19 | Partly cloudy | 27° /15° | 0 mm | 5.4 | |
| Sept. 20 | Sunny | 29° /15° | 0 mm | 5.3 | |
| Sept. 21 | Overcast | 24° /15° | 0 mm | 5 | |
| Sept. 22 | Sunny | 21° /13° | 0 mm | 4 | |
| Sept. 23 | Sunny | 25° /12° | 0 mm | 5 | |
| Sept. 24 | Sunny | 28° /12° | 0 mm | 4.9 | |
| Sept. 25 | Light rain | 24° /13° | 3.4 mm | 4.8 | |
| Sept. 26 | Sunny | 20° /9° | 0 mm | 4 | |
| Sept. 27 | Sunny | 21° /9° | 0 mm | 4 | |
| Sept. 28 | Partly cloudy | 24° /12° | 0 mm | 4.6 | |
| Sept. 29 | Overcast | 22° /13° | 0 mm | 4.5 | |
| Sept. 30 | Overcast | 22° /13° | 0 mm | 4.4 | |
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Important Notice
Our weather forecast for Umatilla 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 Umatilla County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Umatilla County in September - FAQ
What are the expected maximum and minimum temperatures in Umatilla County during September?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Umatilla County during September?
Moderate rainfall is anticipated in Umatilla County during September, with a total of 70.9 mm spread over approximately 6 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Umatilla County during September?
The average wind speed in Umatilla County during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Umatilla County
Explore the daily rainfall trends and prepare for Umatilla Countys September weather 💧
Typically, Umatilla County has 6 rainy days in September with a total of 70.9 mm of rainfall.
UV exposure in Umatilla County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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