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Monthly climate in Rainier, Oregon, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Rainier features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 4 °C (40 °F) and 19 °C (66 °F) through the year, but rarely can drop to -9 °C (16 °F) or can rise to as high as 44 °C (112 °F).The average annual precipitation amounts to about 1324 mm (52.1 inches) and receives 149 rainy days on the 1 mm (0.04 inches) threshold annually.Rainier enjoys an average of 2604 hours of sunshine throughout the year, and daylight varies from 8 hours 40 minutes to 15 hours 41 minutes per day.

Monthly average temperatures in Rainier, Oregon, United States §

The warmest months in Rainier are July, August and September, with daily mean temperatures ranging from 16 to 19 °C (62 - 66 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 5 °C (40 - 41 °F) throughout the day. On average each year, Rainier experiences 43 days above 25 °C (77.0 °F) and 37 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Rainier, 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 14°C
(57°F)		 16°C
(61°F)		 23°C
(73°F)		 30°C
(86°F)		 30°C
(87°F)		 44°C
(112°F)		 36°C
(97°F)		 38°C
(101°F)		 34°C
(93°F)		 24°C
(76°F)		 17°C
(64°F)		 14°C
(57°F)
Mean maximum 12°C
(55°F)		 13°C
(56°F)		 18°C
(65°F)		 24°C
(76°F)		 28°C
(83°F)		 33°C
(91°F)		 33°C
(91°F)		 36°C
(97°F)		 31°C
(88°F)		 21°C
(71°F)		 16°C
(62°F)		 13°C
(55°F)
Average high 8°C
(47°F)		 8°C
(47°F)		 12°C
(53°F)		 15°C
(59°F)		 19°C
(66°F)		 22°C
(71°F)		 25°C
(77°F)		 26°C
(79°F)		 22°C
(72°F)		 15°C
(60°F)		 11°C
(51°F)		 7°C
(45°F)
Daily mean 5°C
(41°F)		 4°C
(40°F)		 7°C
(45°F)		 10°C
(50°F)		 13°C
(56°F)		 16°C
(61°F)		 18°C
(65°F)		 19°C
(66°F)		 16°C
(62°F)		 11°C
(51°F)		 7°C
(45°F)		 5°C
(40°F)
Average low 2°C
(37°F)		 1°C
(35°F)		 3°C
(38°F)		 5°C
(42°F)		 8°C
(47°F)		 11°C
(52°F)		 12°C
(54°F)		 13°C
(56°F)		 11°C
(53°F)		 6°C
(43°F)		 4°C
(40°F)		 2°C
(36°F)
Mean minimum -4°C
(25°F)		 -5°C
(23°F)		 -2°C
(29°F)		 -0°C
(32°F)		 3°C
(38°F)		 6°C
(43°F)		 9°C
(49°F)		 9°C
(48°F)		 6°C
(44°F)		 -1°C
(31°F)		 -2°C
(28°F)		 -4°C
(26°F)
Minimum -9°C
(16°F)		 -8°C
(18°F)		 -3°C
(26°F)		 -2°C
(29°F)		 2°C
(36°F)		 5°C
(42°F)		 8°C
(47°F)		 8°C
(47°F)		 5°C
(42°F)		 -2°C
(29°F)		 -4°C
(26°F)		 -5°C
(24°F)

Compare climate in Rainier with other places

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

Monthly average precipitation in Rainier, Oregon, United States §

Rainier usually has the most precipitation in January, November and December, with an average of 17 rainy days and 183 mm (7.2 inches) of precipitation per month.The driest months in Rainier are June, July and August. On average, 26 mm (1.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Rainier, 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) 183 (7.2) 166 (6.5) 145 (5.7) 119 (4.7) 71 (2.8) 59 (2.3) 9 (0.4) 9 (0.4) 79 (3.1) 117 (4.6) 172 (6.8) 192 (7.6)
Average precipitation days (≥ 1 mm) 17 19 17 16 11 8 2 2 9 12 17 19

Monthly sunshine hours in Rainier, Oregon, United States §

The sunniest months in Rainier are June, July and August, when the sun shines an average of 10 hours 51 minutes a day.Least sunny months in Rainier: January, February and December receive an average of 3 hours 26 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Rainier, 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 85 122 195 223 280 312 359 326 261 202 128 105
Mean daily daylight hours 9h 5m 10h 21m 11h 57m 13h 35m 14h 59m 15h 41m 15h 17m 14h 2m 12h 28m 10h 51m 9h 25m 8h 40m

Solar UV radiation in Rainier, Oregon, United States §

Rainier experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High 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 3. For more detailed information, check out our hourly Rainier UV Index data.

Average daily maximum UV levels by month for Rainier, 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 3 5 6 9 10 10 8 7 5 3 2