Friday Harbor weather by month & the best time to visit
United States · seaside town · oceanic / maritime climate
The best time to visit Friday Harbor is July — its sunniest month (Sunshine Score 87/100), with August close behind. Friday Harbor averages about 2,003 hours of sunshine a year. Daytime highs around 21°C / 70°F and roughly 18 mm of rain in July.
When is the best time to visit Friday Harbor?
For sunshine, the best time to visit Friday Harbor is July, then August. The dullest month is January (0/100, 147 mm of rain). The full month-by-month picture is in the table below.
How sunny is Friday Harbor?
Friday Harbor gets a moderate 2,003 hours of sunshine a year. 87 Sunshine Score points separate July (87) from January (0), so the month you pick matters. It ranks #410 of 580 destinations in United States for annual sunshine, below the national median of 2,279 hours. Rain has a clear season: the wettest stretch, around December, carries about 44% of the annual 991 mm.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | 7° / 45°F | 4° / 39°F | 147 mm | 0 | 9° / 48°F |
| February | 0 | 8° / 46°F | 4° / 39°F | 84 mm | 1 | 8° / 46°F |
| March | 6 | 9° / 48°F | 5° / 41°F | 106 mm | 2 | 9° / 48°F |
| April | 26 | 12° / 54°F | 7° / 45°F | 70 mm | 4 | 10° / 50°F |
| May | 47 | 15° / 59°F | 9° / 48°F | 52 mm | 5 | 11° / 52°F |
| June | 70 | 18° / 64°F | 11° / 52°F | 37 mm | 6 | 13° / 55°F |
| July | 87 | 21° / 70°F | 13° / 55°F | 18 mm | 7 | 16° / 61°F |
| August | 85 | 21° / 70°F | 14° / 57°F | 27 mm | 6 | 16° / 61°F |
| September | 68 | 18° / 64°F | 12° / 54°F | 50 mm | 4 | 16° / 61°F |
| October | 29 | 13° / 55°F | 9° / 48°F | 109 mm | 2 | 12° / 54°F |
| November | 5 | 9° / 48°F | 6° / 43°F | 154 mm | 1 | 10° / 50°F |
| December | 0 | 7° / 45°F | 4° / 39°F | 137 mm | 0 | 9° / 48°F |
Sea temperature in Friday Harbor by month
The sea off Friday Harbor is warmest in July at around 16°C / 61°F, and coolest in February at 8°C / 46°F. It never reaches comfortable swimming temperatures (21°C+). Month-by-month sea-surface temperatures are in the Sea column of the table above.
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Friday Harbor: questions and answers
What kind of destination is Friday Harbor?
Friday Harbor is a seaside town in United States with a oceanic / maritime climate — the sea reaches 16°C at its warmest.
How many hours of sunshine does Friday Harbor get a year?
Friday Harbor gets about 2,003 hours of sunshine a year, at its best around July.
When is the best time to visit Friday Harbor?
The sunniest time to visit Friday Harbor is July, when the Sunshine Score peaks at 87/100 (with August close behind). Expect daytime highs around 21°C / 70°F.
What is the least sunny month in Friday Harbor?
January is the least sunny month in Friday Harbor, scoring 0/100 with about 147 mm of rain.
What is the sea temperature in Friday Harbor?
The sea in Friday Harbor ranges from about 8°C (February) to 16°C (July). Month-by-month sea temperatures are on this page.
How strong is the sun in Friday Harbor?
The typical midday UV index in Friday Harbor peaks around 7 (high) in July, easing to about 0 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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