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Monthly climate in Friday Harbor, Washington, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Friday Harbor features a warm-summer Mediterranean climate (Csb). Temperatures typically range between 6 °C (42 °F) and 15 °C (59 °F) through the year, but rarely can drop to -7 °C (20 °F) or can rise to as high as 20 °C (69 °F). The average annual precipitation amounts to about 1072 mm (42.2 inches) and receives 140 rainy days on the 1 mm (0.04 inches) threshold annually. Friday Harbor enjoys an average of 2827 hours of sunshine throughout the year, and daylight varies from 8 hours 21 minutes to 16 hours 2 minutes per day.

Monthly average temperatures in Friday Harbor, Washington, United States §

The warmest months in Friday Harbor are July, August and September, with daily mean temperatures ranging from 13 to 15 °C (57 - 59 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 7 °C (42 - 45 °F) throughout the day. On average each year, Friday Harbor experiences 0 days above 25 °C (77.0 °F) and 4 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Friday Harbor, 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 11°C
(52°F)		 11°C
(52°F)		 12°C
(55°F)		 14°C
(57°F)		 18°C
(64°F)		 20°C
(69°F)		 20°C
(68°F)		 20°C
(69°F)		 20°C
(68°F)		 15°C
(60°F)		 13°C
(56°F)		 12°C
(54°F)
Mean maximum 10°C
(51°F)		 10°C
(50°F)		 11°C
(51°F)		 12°C
(54°F)		 15°C
(60°F)		 17°C
(63°F)		 18°C
(65°F)		 19°C
(67°F)		 18°C
(65°F)		 14°C
(58°F)		 13°C
(55°F)		 11°C
(51°F)
Average high 8°C
(46°F)		 7°C
(44°F)		 8°C
(47°F)		 10°C
(50°F)		 12°C
(54°F)		 14°C
(57°F)		 15°C
(60°F)		 16°C
(61°F)		 14°C
(58°F)		 12°C
(53°F)		 10°C
(50°F)		 8°C
(46°F)
Daily mean 7°C
(44°F)		 6°C
(42°F)		 7°C
(45°F)		 9°C
(48°F)		 11°C
(52°F)		 13°C
(55°F)		 14°C
(58°F)		 15°C
(59°F)		 13°C
(57°F)		 11°C
(52°F)		 9°C
(48°F)		 7°C
(45°F)
Average low 6°C
(43°F)		 5°C
(41°F)		 6°C
(43°F)		 8°C
(47°F)		 10°C
(51°F)		 12°C
(54°F)		 13°C
(56°F)		 14°C
(57°F)		 13°C
(55°F)		 10°C
(51°F)		 8°C
(47°F)		 6°C
(43°F)
Mean minimum 1°C
(34°F)		 -0°C
(32°F)		 3°C
(38°F)		 5°C
(42°F)		 8°C
(47°F)		 10°C
(51°F)		 12°C
(54°F)		 13°C
(55°F)		 11°C
(52°F)		 7°C
(45°F)		 5°C
(42°F)		 2°C
(35°F)
Minimum -3°C
(27°F)		 -3°C
(27°F)		 2°C
(35°F)		 4°C
(39°F)		 6°C
(44°F)		 10°C
(49°F)		 11°C
(52°F)		 12°C
(55°F)		 11°C
(51°F)		 5°C
(41°F)		 4°C
(39°F)		 -7°C
(20°F)

Compare climate in Friday Harbor with other places

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

Monthly average precipitation in Friday Harbor, Washington, United States §

Friday Harbor usually has the most precipitation in January, November and December, with an average of 17 rainy days and 166 mm (6.5 inches) of precipitation per month. The driest months in Friday Harbor are June, July and August. On average, 21 mm (0.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Friday Harbor, 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) 143 (5.6) 126 (5.0) 84 (3.3) 65 (2.6) 39 (1.5) 32 (1.3) 16 (0.6) 15 (0.6) 68 (2.7) 128 (5.1) 194 (7.6) 161 (6.3)
Average precipitation days (≥ 1 mm) 16 17 14 13 7 6 3 3 9 15 19 18

Monthly sunshine hours in Friday Harbor, Washington, United States §

The sunniest months in Friday Harbor are June, July and August, when the sun shines an average of 11 hours 53 minutes a day. Least sunny months in Friday Harbor: January, November and December receive an average of 3 hours 27 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Friday Harbor, 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 87 150 216 246 338 352 390 350 264 199 130 100
Mean daily daylight hours 8h 48m 10h 12m 11h 57m 13h 44m 15h 15m 16h 2m 15h 36m 14h 13m 12h 30m 10h 44m 9h 10m 8h 21m

Solar UV radiation in Friday Harbor, Washington, United States §

Friday Harbor 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, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Friday Harbor UV Index data.

Average daily maximum UV levels by month for Friday Harbor, 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 2 1

Detailed Monthly Weather Insights for Friday Harbor, Washington, United States

Discover in-depth weather details for every month in Friday Harbor. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Friday Harbor's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.