Umatilla (OR) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Umatilla.
Climate overview of Umatilla
Temperatures in Umatilla, Oregon, United States of America, vary greatly throughout the year. July is the hottest month at 32°C (90°F), while December is the coldest at 5°C (41°F).
Rain/snowfall is extremely rare, with only 216 mm (8.5 in) falling across the entire year.
Umatilla Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Umatilla - and find the best time to visit.
Monthly Temperature in Umatilla
The climate in Umatilla is known for significant temperature differences throughout the year, making the weather dynamic. Average maximum daytime temperatures range from a very warm 32°C (90°F) in July, the warmest time of the year, to a chilly 5°C (41°F) during cooler months like December.
At night, you can expect temperatures ranging from 16°C (61°F) in July to around -3°C (27°F) during December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Umatilla
Umatilla is known for its low rain/snowfall, with yearly precipitation amounts around 216 mm (8.5 in). Significant seasonal changes in precipitation occur throughout the year. In the wettest month, December it receives moderate snow/rainfall, averaging 35 mm (1.4 in) of precipitation, recorded across 15 snowy/rainy days. In contrast, the driest month July brings less rainfall, with 2.9 mm (0.1 in) over 2 rainy days. For more details, please visit our Umatilla Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Umatilla
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: April, May, June, September and October
- Warmest weather: July and August
- Fewest rainy days: July, August and September
- Seasonal pattern: Very little rainfall year-round, with very warm summers and cold winters
- Coldest conditions: December, with freezing nights around -3°C (27°F).
Frequently asked questions about the climate in Umatilla
What is the best time to visit Umatilla?
April, May, June, September and October typically offer the most optimal weather in Umatilla. In contrast, December tends to have less optimal conditions. Umatilla has very little rainfall year-round, with very warm summers and cold winters.
What temperatures can I expect in Umatilla?
Daytime highs range from 5°C (41°F) in December to 32°C (90°F) in July. Nighttime lows range from -3°C (27°F) to 16°C (61°F). Temperatures vary considerably through the year.
How much rain does Umatilla get?
Annual rainfall is around 216 mm (8.5 in). December is the wettest month with 35 mm (1.4 in), while July is the driest with 2.9 mm (0.1 in). In the coldest months, precipitation may fall as snow/rain.
Umatilla 3-Day Forecast
Umatilla on the map
Umatilla is highlighted - select any city to see its climate.
Popular this month
Where to go in August - average daytime high across popular destinations.
Kissimmee
33°C (91°F) Orlando33°C (91°F) Miami Beach32°C (90°F) Destin32°C (90°F) New York City
29°C (84°F) Big Bear Lake
27°C (81°F) Los Angeles
24°C (75°F) San Francisco22°C (72°F) 
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.