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Monthly climate in Oakville, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Oakville features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 4 °C (40 °F) and 18 °C (64 °F) through the year, but rarely can drop to -8 °C (17 °F) or can rise to as high as 42 °C (108 °F).The average annual precipitation amounts to about 1429 mm (56.3 inches) and receives 149 rainy days on the 1 mm (0.04 inches) threshold annually.Oakville enjoys an average of 2558 hours of sunshine throughout the year, and daylight varies from 8 hours 35 minutes to 15 hours 47 minutes per day.

Monthly average temperatures in Oakville, Washington, United States §

The warmest months in Oakville are July, August and September, with daily mean temperatures ranging from 15 to 18 °C (60 - 64 °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, Oakville experiences 31 days above 25 °C (77.0 °F) and 42 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Oakville, 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)		 13°C
(57°F)		 24°C
(76°F)		 28°C
(82°F)		 29°C
(85°F)		 42°C
(108°F)		 35°C
(95°F)		 36°C
(97°F)		 33°C
(91°F)		 24°C
(75°F)		 16°C
(62°F)		 13°C
(55°F)
Mean maximum 12°C
(54°F)		 12°C
(53°F)		 18°C
(65°F)		 23°C
(73°F)		 27°C
(80°F)		 31°C
(89°F)		 31°C
(89°F)		 34°C
(94°F)		 29°C
(85°F)		 20°C
(68°F)		 15°C
(60°F)		 12°C
(54°F)
Average high 8°C
(46°F)		 7°C
(46°F)		 11°C
(52°F)		 14°C
(57°F)		 18°C
(64°F)		 20°C
(69°F)		 23°C
(75°F)		 25°C
(76°F)		 21°C
(70°F)		 14°C
(58°F)		 10°C
(50°F)		 7°C
(45°F)
Daily mean 5°C
(41°F)		 4°C
(40°F)		 6°C
(44°F)		 9°C
(49°F)		 12°C
(55°F)		 15°C
(59°F)		 17°C
(63°F)		 18°C
(64°F)		 15°C
(60°F)		 10°C
(50°F)		 7°C
(45°F)		 4°C
(40°F)
Average low 2°C
(37°F)		 1°C
(34°F)		 3°C
(37°F)		 5°C
(41°F)		 8°C
(46°F)		 10°C
(50°F)		 11°C
(53°F)		 12°C
(54°F)		 11°C
(51°F)		 6°C
(43°F)		 4°C
(39°F)		 2°C
(36°F)
Mean minimum -4°C
(25°F)		 -5°C
(23°F)		 -3°C
(28°F)		 -1°C
(31°F)		 3°C
(37°F)		 5°C
(41°F)		 9°C
(48°F)		 8°C
(47°F)		 5°C
(41°F)		 -0°C
(32°F)		 -3°C
(28°F)		 -4°C
(24°F)
Minimum -8°C
(17°F)		 -8°C
(17°F)		 -3°C
(26°F)		 -3°C
(28°F)		 2°C
(36°F)		 4°C
(40°F)		 8°C
(46°F)		 7°C
(45°F)		 4°C
(39°F)		 -3°C
(27°F)		 -4°C
(25°F)		 -6°C
(21°F)

Compare climate in Oakville with other places

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

Monthly average precipitation in Oakville, Washington, United States §

Oakville usually has the most precipitation in January, November and December, with an average of 17 rainy days and 204 mm (8.0 inches) of precipitation per month.The driest months in Oakville are June, July and August. On average, 27 mm (1.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Oakville, 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) 205 (8.1) 171 (6.7) 142 (5.6) 122 (4.8) 75 (2.9) 57 (2.2) 11 (0.4) 13 (0.5) 90 (3.5) 137 (5.4) 198 (7.8) 210 (8.3)
Average precipitation days (≥ 1 mm) 16 19 17 15 11 8 3 2 10 12 17 19

Monthly sunshine hours in Oakville, Washington, United States §

The sunniest months in Oakville are June, July and August, when the sun shines an average of 10 hours 44 minutes a day.Least sunny months in Oakville: January, November and December receive an average of 3 hours 12 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Oakville, 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 81 120 200 223 287 310 352 324 251 193 119 94
Mean daily daylight hours 9h 0m 10h 19m 11h 57m 13h 38m 15h 4m 15h 47m 15h 23m 14h 6m 12h 29m 10h 49m 9h 20m 8h 35m

Solar UV radiation in Oakville, Washington, United States §

Oakville experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 9 - 9, 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 Oakville UV Index data.

Average daily maximum UV levels by month for Oakville, 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 9 9 8 7 5 3 2