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Monthly climate in Sunnyside, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Sunnyside features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 1 °C (34 °F) and 27 °C (80 °F) through the year, but rarely can drop to -26 °C (-15 °F) or can rise to as high as 47 °C (116 °F).The average annual precipitation amounts to about 264 mm (10.4 inches) and receives 61 rainy days on the 1 mm (0.04 inches) threshold annually.Sunnyside enjoys an average of 3147 hours of sunshine throughout the year, and daylight varies from 8 hours 39 minutes to 15 hours 43 minutes per day.

Monthly average temperatures in Sunnyside, Washington, United States §

The warmest months in Sunnyside are June, July and August, with daily mean temperatures ranging from 23 to 27 °C (73 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 1 to 2 °C (34 - 36 °F) throughout the day. On average each year, Sunnyside experiences 105 days above 25 °C (77.0 °F) and 76 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sunnyside, Washington, 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
(58°F)		 20°C
(68°F)		 22°C
(72°F)		 32°C
(90°F)		 36°C
(97°F)		 47°C
(116°F)		 44°C
(111°F)		 42°C
(108°F)		 40°C
(104°F)		 32°C
(90°F)		 21°C
(71°F)		 20°C
(68°F)
Mean maximum 12°C
(54°F)		 15°C
(60°F)		 20°C
(69°F)		 27°C
(80°F)		 33°C
(92°F)		 37°C
(98°F)		 41°C
(106°F)		 41°C
(106°F)		 36°C
(98°F)		 26°C
(80°F)		 19°C
(67°F)		 15°C
(60°F)
Average high 5°C
(41°F)		 7°C
(45°F)		 13°C
(56°F)		 18°C
(65°F)		 25°C
(77°F)		 29°C
(85°F)		 35°C
(94°F)		 34°C
(93°F)		 27°C
(81°F)		 18°C
(64°F)		 10°C
(50°F)		 5°C
(41°F)
Daily mean 1°C
(34°F)		 2°C
(36°F)		 7°C
(45°F)		 12°C
(54°F)		 18°C
(65°F)		 23°C
(73°F)		 27°C
(80°F)		 26°C
(79°F)		 20°C
(68°F)		 12°C
(53°F)		 5°C
(42°F)		 1°C
(35°F)
Average low -2°C
(28°F)		 -2°C
(29°F)		 2°C
(36°F)		 6°C
(43°F)		 11°C
(52°F)		 15°C
(59°F)		 17°C
(64°F)		 17°C
(63°F)		 12°C
(54°F)		 5°C
(42°F)		 1°C
(34°F)		 -2°C
(29°F)
Mean minimum -10°C
(14°F)		 -10°C
(13°F)		 -5°C
(23°F)		 -1°C
(31°F)		 5°C
(40°F)		 9°C
(49°F)		 12°C
(54°F)		 10°C
(51°F)		 5°C
(42°F)		 -3°C
(26°F)		 -6°C
(22°F)		 -8°C
(18°F)
Minimum -26°C
(-15°F)		 -14°C
(8°F)		 -17°C
(2°F)		 -4°C
(24°F)		 3°C
(38°F)		 8°C
(47°F)		 11°C
(53°F)		 9°C
(48°F)		 4°C
(40°F)		 -9°C
(15°F)		 -7°C
(19°F)		 -10°C
(15°F)

Compare climate in Sunnyside with other places

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

Monthly average precipitation in Sunnyside, Washington, United States §

Sunnyside usually has the most precipitation in January, February and December, with an average of 9 rainy days and 40 mm (1.6 inches) of precipitation per month.The driest months in Sunnyside 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 Sunnyside, Washington, 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) 43 (1.7) 43 (1.7) 25 (1.0) 24 (1.0) 16 (0.6) 7 (0.3) 1 (0.0) 5 (0.2) 9 (0.4) 26 (1.0) 31 (1.2) 35 (1.4)
Average precipitation days (≥ 1 mm) 10 9 7 5 4 2 0 1 3 5 7 8

Monthly sunshine hours in Sunnyside, Washington, United States §

The sunniest months in Sunnyside are June, July and August, when the sun shines an average of 12 hours 32 minutes a day.Least sunny months in Sunnyside: January, February and December receive an average of 4 hours 21 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sunnyside, Washington, 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 97 164 240 293 355 378 412 362 290 246 169 134
Mean daily daylight hours 9h 3m 10h 21m 11h 57m 13h 36m 15h 0m 15h 43m 15h 19m 14h 3m 12h 28m 10h 50m 9h 23m 8h 39m

Solar UV radiation in Sunnyside, Washington, United States §

Sunnyside experiences the highest level of ultraviolet (UV) radiation in June, 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, 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 Sunnyside UV Index data.

Average daily maximum UV levels by month for Sunnyside, Washington, 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 9 7 5 3 2