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Monthly climate in Steilacoom, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Steilacoom 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 -7 °C (20 °F) or can rise to as high as 35 °C (96 °F).The average annual precipitation amounts to about 1213 mm (47.8 inches) and receives 143 rainy days on the 1 mm (0.04 inches) threshold annually.Steilacoom enjoys an average of 2617 hours of sunshine throughout the year, and daylight varies from 8 hours 31 minutes to 15 hours 51 minutes per day.

Monthly average temperatures in Steilacoom, Washington, United States §

The warmest months in Steilacoom 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, Steilacoom experiences 27 days above 25 °C (77.0 °F) and 6 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Steilacoom, 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
(57°F)		 14°C
(58°F)		 20°C
(68°F)		 24°C
(76°F)		 28°C
(83°F)		 35°C
(96°F)		 33°C
(92°F)		 33°C
(91°F)		 30°C
(86°F)		 23°C
(74°F)		 17°C
(63°F)		 14°C
(57°F)
Mean maximum 13°C
(56°F)		 12°C
(54°F)		 17°C
(62°F)		 20°C
(68°F)		 24°C
(76°F)		 29°C
(84°F)		 30°C
(87°F)		 31°C
(88°F)		 27°C
(81°F)		 20°C
(67°F)		 16°C
(61°F)		 13°C
(55°F)
Average high 8°C
(47°F)		 8°C
(46°F)		 11°C
(52°F)		 14°C
(57°F)		 18°C
(64°F)		 21°C
(70°F)		 24°C
(75°F)		 24°C
(76°F)		 21°C
(70°F)		 15°C
(59°F)		 11°C
(52°F)		 8°C
(46°F)
Daily mean 6°C
(43°F)		 5°C
(42°F)		 8°C
(46°F)		 10°C
(50°F)		 14°C
(57°F)		 17°C
(62°F)		 19°C
(67°F)		 20°C
(68°F)		 17°C
(63°F)		 12°C
(53°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)		 15°C
(59°F)		 15°C
(60°F)		 14°C
(57°F)		 9°C
(48°F)		 6°C
(44°F)		 4°C
(40°F)
Mean minimum -1°C
(31°F)		 -3°C
(27°F)		 1°C
(34°F)		 3°C
(37°F)		 7°C
(44°F)		 9°C
(49°F)		 13°C
(55°F)		 13°C
(55°F)		 10°C
(50°F)		 4°C
(40°F)		 2°C
(35°F)		 -1°C
(30°F)
Minimum -5°C
(24°F)		 -7°C
(20°F)		 -0°C
(32°F)		 1°C
(35°F)		 6°C
(42°F)		 8°C
(47°F)		 12°C
(54°F)		 12°C
(53°F)		 8°C
(46°F)		 1°C
(33°F)		 1°C
(33°F)		 -6°C
(22°F)

Compare climate in Steilacoom with other places

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

Monthly average precipitation in Steilacoom, Washington, United States §

Steilacoom usually has the most precipitation in January, November and December, with an average of 17 rainy days and 173 mm (6.8 inches) of precipitation per month.The driest months in Steilacoom are June, July and August. On average, 22 mm (0.9 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Steilacoom, 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) 168 (6.6) 151 (6.0) 116 (4.6) 102 (4.0) 53 (2.1) 46 (1.8) 8 (0.3) 11 (0.5) 83 (3.3) 123 (4.9) 167 (6.6) 184 (7.2)
Average precipitation days (≥ 1 mm) 16 17 16 13 10 7 1 3 10 13 18 19

Monthly sunshine hours in Steilacoom, Washington, United States §

The sunniest months in Steilacoom are June, July and August, when the sun shines an average of 11 hours 10 minutes a day.Least sunny months in Steilacoom: 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 Steilacoom, 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 80 117 198 229 304 316 372 339 258 193 113 92
Mean daily daylight hours 8h 57m 10h 17m 11h 57m 13h 39m 15h 7m 15h 51m 15h 27m 14h 8m 12h 29m 10h 47m 9h 17m 8h 31m

Solar UV radiation in Steilacoom, Washington, United States §

Steilacoom 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 Steilacoom UV Index data.

Average daily maximum UV levels by month for Steilacoom, 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