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Monthly climate in Union, Oregon, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Union features a warm-summer Mediterranean climate (Csb). Temperatures typically range between -3 °C (27 °F) and 20 °C (68 °F) through the year, but rarely can drop to -28 °C (-19 °F) or can rise to as high as 37 °C (99 °F). The average annual precipitation amounts to about 794 mm (31.3 inches) and receives 131 rainy days on the 1 mm (0.04 inches) threshold annually. Union enjoys an average of 3043 hours of sunshine throughout the year, and daylight varies from 8 hours 46 minutes to 15 hours 34 minutes per day.

Monthly average temperatures in Union, Oregon, United States §

The warmest months in Union are June, July and August, with daily mean temperatures ranging from 14 to 20 °C (58 - 68 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to -2 °C (27 - 28 °F) throughout the day. On average each year, Union experiences 51 days above 25 °C (77.0 °F) and 153 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Union, 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 6°C
(43°F)		 13°C
(56°F)		 17°C
(64°F)		 24°C
(75°F)		 28°C
(83°F)		 37°C
(99°F)		 35°C
(96°F)		 37°C
(99°F)		 34°C
(93°F)		 25°C
(78°F)		 16°C
(62°F)		 12°C
(53°F)
Mean maximum 4°C
(40°F)		 9°C
(48°F)		 14°C
(57°F)		 20°C
(69°F)		 25°C
(77°F)		 28°C
(82°F)		 34°C
(93°F)		 34°C
(94°F)		 32°C
(89°F)		 20°C
(69°F)		 13°C
(56°F)		 7°C
(44°F)
Average high -0°C
(32°F)		 1°C
(34°F)		 7°C
(44°F)		 11°C
(52°F)		 16°C
(61°F)		 21°C
(70°F)		 28°C
(82°F)		 27°C
(81°F)		 21°C
(71°F)		 12°C
(54°F)		 5°C
(42°F)		 1°C
(33°F)
Daily mean -3°C
(27°F)		 -3°C
(27°F)		 2°C
(36°F)		 5°C
(42°F)		 10°C
(49°F)		 14°C
(58°F)		 20°C
(68°F)		 19°C
(67°F)		 14°C
(57°F)		 6°C
(44°F)		 2°C
(35°F)		 -2°C
(28°F)
Average low -6°C
(22°F)		 -7°C
(20°F)		 -3°C
(27°F)		 -1°C
(31°F)		 3°C
(38°F)		 7°C
(45°F)		 11°C
(52°F)		 11°C
(52°F)		 6°C
(44°F)		 1°C
(34°F)		 -2°C
(29°F)		 -5°C
(23°F)
Mean minimum -18°C
(0°F)		 -22°C
(-7°F)		 -10°C
(14°F)		 -7°C
(20°F)		 -4°C
(26°F)		 0°C
(33°F)		 5°C
(41°F)		 3°C
(39°F)		 -1°C
(31°F)		 -7°C
(19°F)		 -9°C
(16°F)		 -17°C
(2°F)
Minimum -25°C
(-13°F)		 -28°C
(-19°F)		 -13°C
(9°F)		 -12°C
(10°F)		 -5°C
(24°F)		 -1°C
(30°F)		 3°C
(37°F)		 1°C
(34°F)		 -2°C
(29°F)		 -13°C
(9°F)		 -13°C
(8°F)		 -24°C
(-11°F)

Compare climate in Union with other places

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

Monthly average precipitation in Union, Oregon, United States §

Union usually has the most precipitation in February, March and December, with an average of 17 rainy days and 105 mm (4.1 inches) of precipitation per month. The driest months in Union are July, August and September. On average, 17 mm (0.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Union, 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) 86 (3.4) 132 (5.2) 89 (3.5) 83 (3.3) 75 (2.9) 41 (1.6) 2 (0.1) 16 (0.6) 33 (1.3) 67 (2.6) 76 (3.0) 94 (3.7)
Average precipitation days (≥ 1 mm) 14 19 16 14 12 8 0 3 5 11 13 16

Monthly sunshine hours in Union, Oregon, United States §

The sunniest months in Union are June, July and August, when the sun shines an average of 12 hours 9 minutes a day. Least sunny months in Union: January, February and December receive an average of 4 hours 17 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Union, 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 108 144 237 275 320 356 407 354 295 231 173 137
Mean daily daylight hours 9h 10m 10h 24m 11h 57m 13h 33m 14h 54m 15h 34m 15h 12m 13h 59m 12h 27m 10h 53m 9h 29m 8h 46m

Solar UV radiation in Union, Oregon, United States §

Union experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Union UV Index data.

Average daily maximum UV levels by month for Union, 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) 3 4 7 8 10 10 11 9 8 5 4 2

Detailed Monthly Weather Insights for Union, Oregon, United States

Discover in-depth weather details for every month in Union. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Union's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.