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Monthly climate in Belfair, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Belfair features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 5 °C (42 °F) and 20 °C (68 °F) through the year, but rarely can drop to -4 °C (24 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 1336 mm (52.6 inches) and receives 168 rainy days on the 1 mm (0.04 inches) threshold annually.Belfair enjoys an average of 2578 hours of sunshine throughout the year, and daylight varies from 8 hours 28 minutes to 15 hours 54 minutes per day.

Monthly average temperatures in Belfair, Washington, United States §

The warmest months in Belfair are July, August and September, with daily mean temperatures ranging from 17 to 20 °C (63 - 68 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 6 °C (42 - 43 °F) throughout the day. On average each year, Belfair experiences 21 days above 25 °C (77.0 °F) and 5 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Belfair, 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 13°C
(55°F)		 13°C
(56°F)		 19°C
(66°F)		 24°C
(76°F)		 27°C
(80°F)		 37°C
(99°F)		 30°C
(86°F)		 32°C
(90°F)		 30°C
(87°F)		 23°C
(74°F)		 17°C
(63°F)		 13°C
(56°F)
Mean maximum 12°C
(53°F)		 12°C
(53°F)		 15°C
(59°F)		 19°C
(66°F)		 23°C
(74°F)		 28°C
(83°F)		 29°C
(84°F)		 30°C
(87°F)		 27°C
(80°F)		 19°C
(67°F)		 15°C
(60°F)		 12°C
(54°F)
Average high 8°C
(46°F)		 7°C
(46°F)		 10°C
(51°F)		 13°C
(56°F)		 17°C
(63°F)		 20°C
(68°F)		 23°C
(74°F)		 24°C
(75°F)		 20°C
(69°F)		 15°C
(58°F)		 11°C
(51°F)		 8°C
(46°F)
Daily mean 6°C
(43°F)		 5°C
(42°F)		 7°C
(45°F)		 10°C
(50°F)		 13°C
(56°F)		 16°C
(62°F)		 19°C
(67°F)		 20°C
(68°F)		 17°C
(63°F)		 12°C
(54°F)		 9°C
(48°F)		 6°C
(43°F)
Average low 4°C
(40°F)		 3°C
(38°F)		 5°C
(41°F)		 7°C
(45°F)		 10°C
(51°F)		 13°C
(56°F)		 16°C
(61°F)		 16°C
(62°F)		 14°C
(57°F)		 10°C
(49°F)		 7°C
(45°F)		 5°C
(40°F)
Mean minimum 1°C
(33°F)		 -1°C
(30°F)		 1°C
(34°F)		 3°C
(38°F)		 7°C
(45°F)		 10°C
(49°F)		 13°C
(56°F)		 13°C
(56°F)		 10°C
(50°F)		 5°C
(42°F)		 3°C
(38°F)		 -0°C
(32°F)
Minimum -2°C
(29°F)		 -3°C
(27°F)		 -1°C
(31°F)		 1°C
(34°F)		 6°C
(42°F)		 8°C
(46°F)		 13°C
(55°F)		 12°C
(54°F)		 8°C
(47°F)		 3°C
(37°F)		 2°C
(36°F)		 -4°C
(24°F)

Compare climate in Belfair with other places

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

Monthly average precipitation in Belfair, Washington, United States §

Belfair usually has the most precipitation in January, November and December, with an average of 18 rainy days and 185 mm (7.3 inches) of precipitation per month.The driest months in Belfair are June, July and August. On average, 38 mm (1.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Belfair, 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) 179 (7.0) 146 (5.7) 119 (4.7) 102 (4.0) 67 (2.6) 64 (2.5) 26 (1.0) 24 (0.9) 90 (3.6) 145 (5.7) 181 (7.1) 194 (7.6)
Average precipitation days (≥ 1 mm) 16 20 17 14 12 10 7 6 13 15 18 20

Monthly sunshine hours in Belfair, Washington, United States §

The sunniest months in Belfair are June, July and August, when the sun shines an average of 10 hours 50 minutes a day.Least sunny months in Belfair: January, November and December receive an average of 3 hours 6 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Belfair, 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 78 128 200 226 297 310 359 325 250 192 114 92
Mean daily daylight hours 8h 55m 10h 16m 11h 57m 13h 40m 15h 9m 15h 54m 15h 29m 14h 9m 12h 29m 10h 47m 9h 15m 8h 28m

Solar UV radiation in Belfair, Washington, United States §

Belfair experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 8 - 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 Belfair UV Index data.

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