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Monthly climate in Sultan, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Sultan features a oceanic climate (Cfb).Temperatures typically range between 1 °C (34 °F) and 17 °C (62 °F) through the year, but rarely can drop to -15 °C (6 °F) or can rise to as high as 40 °C (104 °F).The average annual precipitation amounts to about 2229 mm (87.7 inches) and receives 182 rainy days on the 1 mm (0.04 inches) threshold annually.Sultan enjoys an average of 2441 hours of sunshine throughout the year, and daylight varies from 8 hours 26 minutes to 15 hours 56 minutes per day.

Monthly average temperatures in Sultan, Washington, United States §

The warmest months in Sultan are June, July and August, with daily mean temperatures ranging from 14 to 17 °C (57 - 62 °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, Sultan experiences 19 days above 25 °C (77.0 °F) and 71 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sultan, 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 12°C
(54°F)		 13°C
(56°F)		 21°C
(71°F)		 26°C
(80°F)		 27°C
(81°F)		 40°C
(104°F)		 31°C
(88°F)		 34°C
(93°F)		 30°C
(87°F)		 24°C
(75°F)		 17°C
(63°F)		 12°C
(54°F)
Mean maximum 9°C
(49°F)		 10°C
(51°F)		 15°C
(59°F)		 21°C
(70°F)		 24°C
(76°F)		 28°C
(83°F)		 29°C
(85°F)		 31°C
(88°F)		 27°C
(81°F)		 19°C
(67°F)		 14°C
(57°F)		 9°C
(49°F)
Average high 5°C
(41°F)		 4°C
(40°F)		 8°C
(47°F)		 12°C
(53°F)		 16°C
(61°F)		 18°C
(65°F)		 21°C
(71°F)		 22°C
(72°F)		 19°C
(66°F)		 12°C
(54°F)		 8°C
(47°F)		 5°C
(40°F)
Daily mean 2°C
(36°F)		 1°C
(34°F)		 4°C
(39°F)		 7°C
(45°F)		 11°C
(52°F)		 14°C
(57°F)		 16°C
(62°F)		 17°C
(62°F)		 14°C
(57°F)		 8°C
(46°F)		 5°C
(41°F)		 2°C
(36°F)
Average low -0°C
(32°F)		 -2°C
(29°F)		 0°C
(33°F)		 3°C
(37°F)		 6°C
(44°F)		 9°C
(49°F)		 11°C
(52°F)		 11°C
(53°F)		 9°C
(49°F)		 4°C
(39°F)		 2°C
(36°F)		 -0°C
(32°F)
Mean minimum -8°C
(18°F)		 -12°C
(11°F)		 -6°C
(22°F)		 -4°C
(25°F)		 2°C
(35°F)		 4°C
(40°F)		 7°C
(46°F)		 6°C
(44°F)		 4°C
(39°F)		 -3°C
(28°F)		 -4°C
(25°F)		 -8°C
(17°F)
Minimum -14°C
(7°F)		 -15°C
(6°F)		 -8°C
(19°F)		 -8°C
(17°F)		 -0°C
(32°F)		 3°C
(39°F)		 6°C
(44°F)		 5°C
(41°F)		 3°C
(37°F)		 -5°C
(23°F)		 -5°C
(23°F)		 -13°C
(9°F)

Compare climate in Sultan with other places

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

Monthly average precipitation in Sultan, Washington, United States §

Sultan usually has the most precipitation in February, November and December, with an average of 20 rainy days and 301 mm (11.9 inches) of precipitation per month.The driest months in Sultan are June, July and August. On average, 57 mm (2.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sultan, 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) 261 (10.3) 303 (11.9) 202 (7.9) 182 (7.2) 112 (4.4) 102 (4.0) 40 (1.6) 30 (1.2) 136 (5.4) 261 (10.3) 301 (11.8) 300 (11.8)
Average precipitation days (≥ 1 mm) 16 21 19 17 14 13 8 6 13 16 19 20

Monthly sunshine hours in Sultan, Washington, United States §

The sunniest months in Sultan are June, July and August, when the sun shines an average of 10 hours 37 minutes a day.Least sunny months in Sultan: January, February and December receive an average of 2 hours 48 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sultan, 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 75 99 179 224 287 294 356 325 246 166 103 81
Mean daily daylight hours 8h 53m 10h 15m 11h 57m 13h 41m 15h 11m 15h 56m 15h 31m 14h 10m 12h 30m 10h 46m 9h 14m 8h 26m

Solar UV radiation in Sultan, Washington, United States §

Sultan experiences the highest level of ultraviolet (UV) radiation in May, July and August, 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 Sultan UV Index data.

Average daily maximum UV levels by month for Sultan, 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 6 7 9 9 9 9 7 5 3 2