Umatilla County (Pendleton)
August
Weather in Umatilla County, Oregon for August 2026
Your guide to Umatilla County weather in August - trends and predictions
In general, the average temperature in Umatilla County at the beginning of August is 26.7 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 35.1 °F by the end of August.
Precipitation in Umatilla County during August is a rare event, with an average of fewer than 2 rainy days.
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Temperatures
Rain 🌧️
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30
Dry days
1
Rainy days
0
Snow days
31°/17°
Temperatures
19 km/h
Avg max wind
41 %
Avg humidity
Umatilla County Weather August
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Temperatures trend during August in Umatilla County
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August weather in Umatilla County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Heavy rain at times | 22° /17° | 19.1 mm | 5 | |
| Aug. 2 |  Sunny | 33° /16° | 0 mm | 8 | |
| Aug. 3 |  Partly cloudy | 30° /17° | 0 mm | 8 | |
| Aug. 4 |  Overcast | 26° /14° | 0 mm | 6 | |
| Aug. 5 | Overcast | 28° /12° | 0 mm | 6 | |
| Aug. 6 | Overcast | 23° /16° | 0 mm | 5 | |
| Aug. 7 | Partly cloudy | 25° /16° | 0 mm | 7 | |
| Aug. 8 | Sunny | 29° /11° | 0 mm | 7 | |
| Aug. 9 |  Cloudy | 31° /16° | 0 mm | 7 | |
| Aug. 10 | Sunny | 34° /17° | 0 mm | 8 | |
| Aug. 11 | Sunny | 38° /20° | 0 mm | 9 | |
| Aug. 12 | Sunny | 38° /21° | 0 mm | 9 | |
| Aug. 13 | Sunny | 34° /21° | 0 mm | 8 | |
| Aug. 14 | Sunny | 28° /16° | 0 mm | 7 | |
| Aug. 15 | Partly cloudy | 29° /16° | 0 mm | 7 | |
| Aug. 16 | Overcast | 22° /18° | 0 mm | 5 | |
| Aug. 17 | Partly cloudy | 28° /16° | 0 mm | 7 | |
| Aug. 18 | Sunny | 29° /16° | 0 mm | 7 | |
| Aug. 19 | Sunny | 30° /15° | 0 mm | 8 | |
| Aug. 20 | Sunny | 29° /15° | 0 mm | 7 | |
| Aug. 21 | Sunny | 31° /16° | 0 mm | 8 | |
| Aug. 22 | Sunny | 34° /16° | 0 mm | 8 | |
| Aug. 23 | Cloudy | 37° /18° | 0 mm | 8 | |
| Aug. 24 | Sunny | 38° /22° | 0 mm | 9 | |
| Aug. 25 | Partly cloudy | 38° /22° | 0 mm | 9 | |
| Aug. 26 | Overcast | 35° /20° | 0 mm | 8 | |
| Aug. 27 | Overcast | 31° /22° | 0 mm | 7 | |
| Aug. 28 | Sunny | 34° /18° | 0 mm | 8 | |
| Aug. 29 | Sunny | 35° /19° | 0 mm | 9 | |
| Aug. 30 | Sunny | 36° /18° | 0 mm | 9 | |
| Aug. 31 | Sunny | 37° /20° | 0 mm | 9 | |
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Important Notice
Our weather forecast for Umatilla County in August 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.
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Umatilla County in August - FAQ
What are the expected maximum and minimum temperatures in Umatilla County during August?
Expect warm days with temperatures around 31°, cooling to mild conditions of 17° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in Umatilla County during August?
Expect minimal rainfall in Umatilla County during August, with a total of 19.1 mm over approximately 1 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Umatilla County during August?
The average wind speed in Umatilla County during August is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in Umatilla County
Explore the daily rainfall trends and prepare for Umatilla Countys August weather 💧
UV exposure in Umatilla County during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
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