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Monthly climate in West Side Highway, Washington, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification West Side Highway features a warm-summer Mediterranean climate (Csb).Temperatures typically range between 4 °C (40 °F) and 19 °C (66 °F) through the year, but rarely can drop to -9 °C (16 °F) or can rise to as high as 44 °C (112 °F).The average annual precipitation amounts to about 1390 mm (54.7 inches) and receives 152 rainy days on the 1 mm (0.04 inches) threshold annually.West Side Highway enjoys an average of 2496 hours of sunshine throughout the year, and daylight varies from 8 hours 40 minutes to 15 hours 42 minutes per day.

Monthly average temperatures in West Side Highway, Washington, United States §

The warmest months in West Side Highway are July, August and September, with daily mean temperatures ranging from 16 to 19 °C (61 - 66 °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, West Side Highway experiences 41 days above 25 °C (77.0 °F) and 41 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in West Side Highway, 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 15°C
(59°F)		 15°C
(60°F)		 24°C
(75°F)		 29°C
(85°F)		 30°C
(86°F)		 44°C
(112°F)		 36°C
(96°F)		 38°C
(100°F)		 34°C
(93°F)		 24°C
(76°F)		 17°C
(63°F)		 14°C
(57°F)
Mean maximum 13°C
(55°F)		 13°C
(55°F)		 19°C
(66°F)		 24°C
(76°F)		 28°C
(82°F)		 33°C
(91°F)		 32°C
(90°F)		 35°C
(96°F)		 31°C
(88°F)		 21°C
(70°F)		 16°C
(62°F)		 13°C
(55°F)
Average high 8°C
(47°F)		 8°C
(46°F)		 12°C
(53°F)		 15°C
(59°F)		 19°C
(66°F)		 21°C
(71°F)		 25°C
(77°F)		 26°C
(79°F)		 22°C
(72°F)		 15°C
(60°F)		 11°C
(51°F)		 7°C
(46°F)
Daily mean 5°C
(41°F)		 4°C
(40°F)		 7°C
(45°F)		 10°C
(50°F)		 13°C
(56°F)		 16°C
(61°F)		 18°C
(65°F)		 19°C
(66°F)		 16°C
(61°F)		 10°C
(51°F)		 7°C
(45°F)		 4°C
(40°F)
Average low 2°C
(37°F)		 1°C
(34°F)		 3°C
(38°F)		 5°C
(42°F)		 8°C
(47°F)		 11°C
(51°F)		 12°C
(54°F)		 13°C
(55°F)		 11°C
(52°F)		 6°C
(43°F)		 4°C
(39°F)		 2°C
(36°F)
Mean minimum -5°C
(24°F)		 -5°C
(23°F)		 -2°C
(29°F)		 0°C
(33°F)		 3°C
(38°F)		 6°C
(44°F)		 9°C
(49°F)		 8°C
(48°F)		 6°C
(43°F)		 -1°C
(31°F)		 -3°C
(27°F)		 -5°C
(24°F)
Minimum -9°C
(16°F)		 -8°C
(17°F)		 -3°C
(26°F)		 -1°C
(30°F)		 3°C
(37°F)		 5°C
(42°F)		 8°C
(46°F)		 8°C
(46°F)		 5°C
(42°F)		 -4°C
(25°F)		 -4°C
(25°F)		 -7°C
(19°F)

Compare climate in West Side Highway with other places

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

Monthly average precipitation in West Side Highway, Washington, United States §

West Side Highway usually has the most precipitation in January, November and December, with an average of 18 rainy days and 190 mm (7.5 inches) of precipitation per month.The driest months in West Side Highway 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 West Side Highway, 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) 190 (7.5) 175 (6.9) 150 (5.9) 125 (4.9) 74 (2.9) 59 (2.3) 10 (0.4) 10 (0.4) 84 (3.3) 132 (5.2) 179 (7.0) 202 (8.0)
Average precipitation days (≥ 1 mm) 17 19 18 16 11 8 2 2 9 13 18 19

Monthly sunshine hours in West Side Highway, Washington, United States §

The sunniest months in West Side Highway are June, July and August, when the sun shines an average of 10 hours 31 minutes a day.Least sunny months in West Side Highway: January, February and December receive an average of 3 hours 11 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in West Side Highway, 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 80 116 190 215 275 303 346 318 247 189 119 93
Mean daily daylight hours 9h 4m 10h 21m 11h 57m 13h 35m 14h 59m 15h 42m 15h 18m 14h 3m 12h 28m 10h 50m 9h 24m 8h 40m

Solar UV radiation in West Side Highway, Washington, United States §

West Side Highway experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 9 - 10, 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 West Side Highway UV Index data.

Average daily maximum UV levels by month for West Side Highway, 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 10 9 8 7 5 3 2