Umatilla County (Pendleton)
May
Weather in Umatilla County, Oregon for May 2026
Your guide to Umatilla County weather in May - trends and predictions
In general, the average temperature in Umatilla County at the beginning of May is 21.1 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 25.3 °F by the end of May.
The climate of Umatilla County in May is notably wet, with an average of 11 rainy days, and a total of 27.1 mm of precipitation.
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Temperatures
Rain 🌧️
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20
Dry days
11
Rainy days
0
Snow days
21°/9°
Temperatures
22 km/h
Avg max wind
62 %
Avg humidity
Umatilla County Weather May
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Temperatures trend during May in Umatilla County
See the weather trend as well as the moving average line
May weather in Umatilla County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Sunny | 24° /5° | 0 mm | 6 | |
| May 2 | Sunny | 27° /8° | 0 mm | 7 | |
| May 3 |  Patchy rain possible | 15° /10° | 0.6 mm | 4 | |
| May 4 |  Partly cloudy | 15° /4° | 0 mm | 5 | |
| May 5 | Sunny | 20° /5° | 0 mm | 6 | |
| May 6 | Sunny | 22° /7° | 0 mm | 6 | |
| May 7 | Sunny | 25° /8° | 0 mm | 7 | |
| May 8 | Partly cloudy | 19° /8° | 0.2 mm | 5 | |
| May 9 |  Overcast | 24° /9° | 0 mm | 5 | |
| May 10 | Overcast | 25° /13° | 0 mm | 6 | |
| May 11 |  Moderate or heavy rain shower | 17° /10° | 5.9 mm | 4 | |
| May 12 | Patchy rain possible | 15° /6° | 0.4 mm | 4 | |
| May 13 | Patchy rain possible | 16° /7° | 0.4 mm | 4 | |
| May 14 | Overcast | 17° /7° | 0.1 mm | 4 | |
| May 15 |  Cloudy | 17° /5° | 0.1 mm | 4 | |
| May 16 | Overcast | 17° /8° | 0.9 mm | 4 | |
| May 17 | Moderate or heavy rain shower | 18° /9° | 12.8 mm | 4 | |
| May 18 | Patchy rain possible | 14° /7° | 0.5 mm | 3 | |
| May 19 | Moderate rain at times | 17° /4° | 1.2 mm | 4 | |
| May 20 | Patchy rain possible | 16° /7° | 0.6 mm | 4 | |
| May 21 | Partly cloudy | 17° /6° | 0 mm | 5 | |
| May 22 | Overcast | 18° /10° | 0.7 mm | 4 | |
| May 23 | Partly cloudy | 21° /9° | 0 mm | 6 | |
| May 24 | Cloudy | 25° /10° | 0 mm | 6 | |
| May 25 | Sunny | 28° /12° | 0 mm | 7 | |
| May 26 | Cloudy | 20° /11° | 2.7 mm | 5 | |
| May 27 | Partly cloudy | 24° /6° | 0 mm | 6 | |
| May 28 | Overcast | 29° /13° | 0 mm | 6 | |
| May 29 | Cloudy | 22° /14° | 0 mm | 5 | |
| May 30 | Partly cloudy | 25° /9° | 0 mm | 7 | |
| May 31 | Partly cloudy | 29° /15° | 0 mm | 7 | |
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Important Notice
Our weather forecast for Umatilla County in May 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 May - FAQ
What are the expected maximum and minimum temperatures in Umatilla County during May?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Umatilla County during May?
In May, Umatilla County can expect light to moderate rainfall, totaling 27.1 mm across approximately 11 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Umatilla County during May?
The average wind speed in Umatilla County during May is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Umatilla County
Explore the daily rainfall trends and prepare for Umatilla Countys May weather 💧
UV exposure in Umatilla County during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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Where is Umatilla County?Get accurate weather forecasts for Umatilla County, located at latitude 45.672 and longitude -118.789. Stay updated with localized weather information tailored for Umatilla County.
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