Umatilla County (Pendleton)
December
Weather in Umatilla County, Oregon for December 2026
Your guide to Umatilla County weather in December - trends and predictions
The climate of Umatilla County in December is notably wet, with an average of 12 rainy days, and a total of 137.4 mm of precipitation.
Is December a good time to visit Umatilla County? check out the best time to travel to Umatilla County page.
✨ Is December a good time to visit Umatilla County? – Ask the AI Weatherman
Rain 🌧️
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19
Dry days
12
Rainy days
0
Snow days
7°/2°
Temperatures
19 km/h
Avg max wind
81 %
Avg humidity
Umatilla County Weather December
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Temperatures trend during December in Umatilla County
See the weather trend as well as the moving average line
December weather in Umatilla County day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 |  Cloudy | 2° /-3° | 0 mm | 0 cm | |
| Dec. 2 |  Patchy rain possible | 2° /1° | 1.7 mm | 0 cm | |
| Dec. 3 |  Overcast | 3° /1° | 0 mm | 0 cm | |
| Dec. 4 |  Moderate rain | 4° /0° | 15.2 mm | 0 cm | |
| Dec. 5 |  Light rain | 7° /1° | 3.3 mm | 0 cm | |
| Dec. 6 | Overcast | 5° /2° | 0 mm | 0 cm | |
| Dec. 7 |  Moderate or heavy rain shower | 8° /2° | 9.1 mm | 0 cm | |
| Dec. 8 | Patchy rain possible | 10° /5° | 0.4 mm | 0 cm | |
| Dec. 9 | Moderate rain | 9° /4° | 13.4 mm | 0 cm | |
| Dec. 10 | Overcast | 8° /5° | 0 mm | 0 cm | |
| Dec. 11 | Cloudy | 10° /5° | 0 mm | 0 cm | |
| Dec. 12 |  Light freezing rain | 7° /3° | 1.5 mm | 0 cm | |
| Dec. 13 | Patchy rain possible | 11° /2° | 2.3 mm | 0 cm | |
| Dec. 14 | Moderate or heavy rain shower | 11° /3° | 5.1 mm | 0 cm | |
| Dec. 15 | Patchy rain possible | 11° /4° | 0.1 mm | 0 cm | |
| Dec. 16 | Moderate or heavy rain shower | 8° /4° | 5.2 mm | 0 cm | |
| Dec. 17 | Moderate or heavy rain shower | 11° /3° | 9.8 mm | 0 cm | |
| Dec. 18 | Moderate rain | 12° /3° | 10.6 mm | 0 cm | |
| Dec. 19 |  Light snow | 9° /1° | 4.8 mm | 2 cm | |
| Dec. 20 | Overcast | 7° /1° | 0 mm | 0 cm | |
| Dec. 21 | Light rain | 7° /1° | 4.1 mm | 0 cm | |
| Dec. 22 | Light rain | 9° /2° | 3.3 mm | 0 cm | |
| Dec. 23 | Patchy rain possible | 9° /3° | 2.2 mm | 0 cm | |
| Dec. 24 | Moderate or heavy rain shower | 11° /3° | 9.5 mm | 0 cm | |
| Dec. 25 | Light rain | 9° /1° | 4.7 mm | 0 cm | |
| Dec. 26 | Moderate rain | 9° /4° | 17.8 mm | 0 cm | |
| Dec. 27 | Moderate or heavy rain shower | 5° /2° | 7.3 mm | 0 cm | |
| Dec. 28 | Light rain | 5° /2° | 2.5 mm | 0 cm | |
| Dec. 29 | Light rain | 7° /2° | 3.4 mm | 0 cm | |
| Dec. 30 | Patchy rain possible | 6° /0° | 0.1 mm | 0 cm | |
| Dec. 31 |  Partly cloudy | 4° /-1° | 0 mm | 0 cm | |
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Important Notice
Our weather forecast for Umatilla County in December 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 December - FAQ
What are the expected maximum and minimum temperatures in Umatilla County during December?
Prepare for cooler days with highs just around 7° and colder nights, dipping below 2°.
How much rainfall should be expected in Umatilla County during December?
Significant rainfall exceeding 137.4 mm is expected in Umatilla County during December, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Umatilla County in December 2026?
Umatilla County typically sees 2 cm of snowfall during December.
What are the typical wind conditions in Umatilla County during December?
The average wind speed in Umatilla County during December is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
Umatilla County snow forecast December 2026
Track daily snowfall levels and discover Umatilla County’s snowy potential this December ❄️
December rainfall patterns in Umatilla County
Explore the daily rainfall trends and prepare for Umatilla Countys December weather 💧
Typically, Umatilla County has 12 rainy days in December with a total of 137.4 mm of rainfall.
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