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Monthly climate in Cosmopolis, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Cosmopolis features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 5 °C (42 °F) and 17 °C (63 °F) through the year, but rarely can drop to -7 °C (21 °F) or can rise to as high as 40 °C (104 °F).The average annual precipitation amounts to about 1622 mm (63.9 inches) and receives 148 rainy days on the 1 mm (0.04 inches) threshold annually.Cosmopolis enjoys an average of 2707 hours of sunshine throughout the year, and daylight varies from 8 hours 33 minutes to 15 hours 48 minutes per day.

Monthly average temperatures in Cosmopolis, Washington, United States §

The warmest months in Cosmopolis are July, August and September, with daily mean temperatures ranging from 15 to 17 °C (60 - 63 °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, Cosmopolis experiences 16 days above 25 °C (77.0 °F) and 16 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Cosmopolis, 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)		 15°C
(59°F)		 25°C
(77°F)		 27°C
(81°F)		 29°C
(85°F)		 40°C
(104°F)		 32°C
(89°F)		 34°C
(93°F)		 31°C
(89°F)		 22°C
(72°F)		 16°C
(62°F)		 14°C
(57°F)
Mean maximum 12°C
(55°F)		 12°C
(55°F)		 17°C
(64°F)		 22°C
(72°F)		 26°C
(79°F)		 30°C
(86°F)		 28°C
(83°F)		 33°C
(91°F)		 28°C
(83°F)		 20°C
(68°F)		 16°C
(60°F)		 13°C
(55°F)
Average high 9°C
(48°F)		 8°C
(47°F)		 11°C
(52°F)		 14°C
(57°F)		 17°C
(62°F)		 19°C
(67°F)		 21°C
(71°F)		 22°C
(73°F)		 20°C
(68°F)		 15°C
(59°F)		 11°C
(52°F)		 8°C
(47°F)
Daily mean 6°C
(43°F)		 5°C
(42°F)		 7°C
(45°F)		 10°C
(50°F)		 13°C
(55°F)		 15°C
(59°F)		 16°C
(62°F)		 17°C
(63°F)		 15°C
(60°F)		 11°C
(52°F)		 8°C
(47°F)		 6°C
(43°F)
Average low 4°C
(39°F)		 3°C
(37°F)		 4°C
(40°F)		 6°C
(43°F)		 9°C
(48°F)		 11°C
(52°F)		 12°C
(54°F)		 13°C
(55°F)		 12°C
(53°F)		 8°C
(46°F)		 6°C
(43°F)		 4°C
(39°F)
Mean minimum -2°C
(29°F)		 -3°C
(27°F)		 -1°C
(30°F)		 1°C
(35°F)		 5°C
(41°F)		 7°C
(45°F)		 10°C
(49°F)		 9°C
(49°F)		 6°C
(44°F)		 2°C
(35°F)		 0°C
(33°F)		 -2°C
(28°F)
Minimum -7°C
(21°F)		 -5°C
(24°F)		 -2°C
(29°F)		 -0°C
(32°F)		 4°C
(40°F)		 6°C
(44°F)		 9°C
(48°F)		 9°C
(48°F)		 5°C
(41°F)		 -0°C
(32°F)		 -2°C
(29°F)		 -4°C
(25°F)

Compare climate in Cosmopolis with other places

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

Monthly average precipitation in Cosmopolis, Washington, United States §

Cosmopolis usually has the most precipitation in January, November and December, with an average of 18 rainy days and 251 mm (9.9 inches) of precipitation per month.The driest months in Cosmopolis are June, July and August. On average, 26 mm (1.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Cosmopolis, 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) 255 (10.0) 174 (6.8) 150 (5.9) 132 (5.2) 64 (2.5) 54 (2.1) 12 (0.5) 13 (0.5) 101 (4.0) 170 (6.7) 261 (10.3) 236 (9.3)
Average precipitation days (≥ 1 mm) 18 17 16 15 9 7 3 2 10 14 18 19

Monthly sunshine hours in Cosmopolis, Washington, United States §

The sunniest months in Cosmopolis are June, July and August, when the sun shines an average of 11 hours 9 minutes a day.Least sunny months in Cosmopolis: January, November and December receive an average of 3 hours 26 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Cosmopolis, 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 85 136 216 238 306 328 364 334 263 203 127 102
Mean daily daylight hours 8h 59m 10h 18m 11h 57m 13h 38m 15h 5m 15h 48m 15h 24m 14h 6m 12h 29m 10h 48m 9h 19m 8h 33m

Solar UV radiation in Cosmopolis, Washington, United States §

Cosmopolis 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 Cosmopolis UV Index data.

Average daily maximum UV levels by month for Cosmopolis, 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