Unalaska weather by month & the best time to visit
United States · seaside town · oceanic / maritime climate
Unalaska is short on reliable sunshine. Its best month is August (Score 22/100) — for stronger sun, try one of the nearby alternatives.
When is the best time to visit Unalaska?
Unalaska never gets truly sunny weather: August is as good as it gets at 22/100, and January is the low point (0/100). If sunshine is the point of the trip, the nearby alternatives do better.
How sunny is Unalaska?
Unalaska isn't a sunny place by world standards: about 1,055 hours of sunshine a year. August (22/100) is noticeably better than January (0). It ranks #574 of 580 destinations in United States for annual sunshine, below the national median of 2,279 hours. The year's 1,313 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | 2° / 36°F | 0° / 32°F | 120 mm | 0 | 4° / 39°F |
| February | 0 | 3° / 37°F | 1° / 34°F | 108 mm | 1 | 3° / 37°F |
| March | 0 | 2° / 36°F | 0° / 32°F | 80 mm | 1 | 3° / 37°F |
| April | 0 | 4° / 39°F | 2° / 36°F | 81 mm | 2 | 3° / 37°F |
| May | 0 | 6° / 43°F | 4° / 39°F | 100 mm | 3 | 4° / 39°F |
| June | 6 | 9° / 48°F | 7° / 45°F | 93 mm | 4 | 6° / 43°F |
| July | 17 | 11° / 52°F | 9° / 48°F | 93 mm | 4 | 9° / 48°F |
| August | 22 | 12° / 54°F | 10° / 50°F | 94 mm | 4 | 9° / 48°F |
| September | 10 | 10° / 50°F | 8° / 46°F | 117 mm | 2 | 8° / 46°F |
| October | 0 | 7° / 45°F | 6° / 43°F | 140 mm | 1 | 7° / 45°F |
| November | 0 | 5° / 41°F | 3° / 37°F | 119 mm | 0 | 6° / 43°F |
| December | 0 | 3° / 37°F | 1° / 34°F | 168 mm | 0 | 5° / 41°F |
Sea temperature in Unalaska by month
The sea off Unalaska is warmest in July at around 9°C / 48°F, and coolest in February at 3°C / 37°F. It never reaches comfortable swimming temperatures (21°C+). Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Unalaska: questions and answers
What kind of destination is Unalaska?
Unalaska is a seaside town in United States with a oceanic / maritime climate — the sea reaches 9°C at its warmest.
How many hours of sunshine does Unalaska get a year?
Unalaska gets about 1,055 hours of sunshine a year, at its best around August.
When is the best time to visit Unalaska?
Unalaska is short on reliable sunshine — its best month is only August at 22/100. For a sunnier trip, see the nearest strong-sun alternatives listed on the page.
What is the least sunny month in Unalaska?
January is the least sunny month in Unalaska, scoring 0/100 with about 120 mm of rain.
What is the sea temperature in Unalaska?
The sea in Unalaska ranges from about 3°C (February) to 9°C (July). Month-by-month sea temperatures are on this page.
How strong is the sun in Unalaska?
The typical midday UV index in Unalaska peaks around 4 (moderate) in June, 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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