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Monthly climate in Umatilla, Oregon, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Umatilla features a cold semi-arid climate (BSk).Temperatures typically range between 2 °C (36 °F) and 27 °C (81 °F) through the year, but rarely can drop to -17 °C (2 °F) or can rise to as high as 48 °C (118 °F).The average annual precipitation amounts to about 265 mm (10.4 inches) and receives 61 rainy days on the 1 mm (0.04 inches) threshold annually.Umatilla enjoys an average of 3215 hours of sunshine throughout the year, and daylight varies from 8 hours 42 minutes to 15 hours 39 minutes per day.

Monthly average temperatures in Umatilla, Oregon, United States §

The warmest months in Umatilla are June, July and August, with daily mean temperatures ranging from 23 to 27 °C (73 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 3 °C (36 - 37 °F) throughout the day. On average each year, Umatilla experiences 107 days above 25 °C (77.0 °F) and 66 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Umatilla, Oregon, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 17°C
(63°F)		 19°C
(67°F)		 23°C
(73°F)		 32°C
(90°F)		 37°C
(98°F)		 48°C
(118°F)		 44°C
(112°F)		 43°C
(109°F)		 39°C
(102°F)		 32°C
(90°F)		 24°C
(75°F)		 20°C
(68°F)
Mean maximum 13°C
(56°F)		 16°C
(61°F)		 21°C
(70°F)		 27°C
(81°F)		 34°C
(94°F)		 37°C
(99°F)		 42°C
(107°F)		 41°C
(107°F)		 36°C
(98°F)		 26°C
(80°F)		 21°C
(70°F)		 17°C
(62°F)
Average high 6°C
(42°F)		 8°C
(46°F)		 14°C
(57°F)		 19°C
(66°F)		 25°C
(78°F)		 30°C
(86°F)		 35°C
(95°F)		 34°C
(94°F)		 27°C
(82°F)		 18°C
(65°F)		 10°C
(51°F)		 6°C
(42°F)
Daily mean 2°C
(36°F)		 3°C
(37°F)		 8°C
(46°F)		 13°C
(55°F)		 18°C
(65°F)		 23°C
(73°F)		 27°C
(81°F)		 26°C
(79°F)		 20°C
(69°F)		 12°C
(54°F)		 6°C
(43°F)		 2°C
(37°F)
Average low -1°C
(31°F)		 -1°C
(30°F)		 3°C
(37°F)		 6°C
(43°F)		 11°C
(52°F)		 15°C
(59°F)		 18°C
(64°F)		 18°C
(64°F)		 13°C
(55°F)		 7°C
(44°F)		 2°C
(36°F)		 -0°C
(31°F)
Mean minimum -8°C
(18°F)		 -9°C
(16°F)		 -4°C
(25°F)		 0°C
(33°F)		 4°C
(40°F)		 9°C
(48°F)		 13°C
(55°F)		 11°C
(52°F)		 7°C
(44°F)		 -0°C
(31°F)		 -4°C
(25°F)		 -7°C
(20°F)
Minimum -17°C
(2°F)		 -12°C
(10°F)		 -14°C
(7°F)		 -2°C
(29°F)		 2°C
(35°F)		 8°C
(47°F)		 12°C
(54°F)		 9°C
(49°F)		 5°C
(42°F)		 -6°C
(21°F)		 -7°C
(20°F)		 -9°C
(16°F)

Compare climate in Umatilla with other places

Compare temperature, precipitation, sunshine, UV index in Umatilla, Oregon, United States with other places around the world.

Monthly average precipitation in Umatilla, Oregon, United States §

Umatilla usually has the most precipitation in January, February and November, with an average of 9 rainy days and 38 mm (1.5 inches) of precipitation per month.The driest months in Umatilla are June, July and August. On average, 4 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Umatilla, Oregon, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 35 (1.4) 46 (1.8) 30 (1.2) 24 (0.9) 15 (0.6) 8 (0.3) 0 (0.0) 4 (0.1) 9 (0.4) 26 (1.0) 34 (1.3) 33 (1.3)
Average precipitation days (≥ 1 mm) 9 11 7 5 3 2 0 0 2 6 8 8

Monthly sunshine hours in Umatilla, Oregon, United States §

The sunniest months in Umatilla are June, July and August, when the sun shines an average of 12 hours 30 minutes a day.Least sunny months in Umatilla: January, February and December receive an average of 4 hours 48 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Umatilla, Oregon, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 117 166 250 294 354 376 414 360 296 249 181 154
Mean daily daylight hours 9h 6m 10h 22m 11h 57m 13h 35m 14h 58m 15h 39m 15h 16m 14h 2m 12h 28m 10h 51m 9h 26m 8h 42m

Solar UV radiation in Umatilla, Oregon, United States §

Umatilla experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Umatilla UV Index data.

Average daily maximum UV levels by month for Umatilla, Oregon, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 4 5 6 9 9 10 9 7 5 3 2