United States · Gulf of Alaska
Anchorage
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Climate · monthly averages
Sea temperature by month
30-year averages (1996–2025). Min/Max are typical daily lows and highs, not record extremes.
32°F
36°F
39°F
43°F
46°F
50°F
54°F
57°F
61°F
64°F
January
34.0°F(30°F–37°F)
February
33.4°F(30°F–36°F)
March
32.7°F(29°F–35°F)
April
33.6°F(30°F–37°F)
May
39.2°F(33°F–45°F)
June
48.3°F(41°F–56°F)
July
55.2°F(51°F–60°F)
August
56.7°F(53°F–60°F)
September
53.7°F(52°F–56°F)
October
45.8°F(44°F–48°F)
November
38.5°F(36°F–40°F)
December
34.9°F(31°F–38°F)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MinMin °F | 3030.1 | 3029.8 | 2929.1 | 3030.2 | 3332.9 | 4141.5 | 5151.4 | 5353.0 | 5252.1 | 4443.9 | 3636.4 | 3131.3 |
| AvgAvg °F | 3434.0 | 3333.4 | 3332.7 | 3433.6 | 3939.2 | 4848.3 | 5555.2 | 5756.7 | 5453.7 | 4645.8 | 3838.5 | 3534.9 |
| MaxMax °F | 3736.9 | 3636.0 | 3535.4 | 3736.9 | 4545.4 | 5655.6 | 6059.8 | 6060.2 | 5655.6 | 4847.8 | 4040.3 | 3837.8 |
Warmest in August (56.7°F). Coldest in March (32.7°F). Rarely comfortable for swimming.
About Anchorage
Anchorage sits on Cook Inlet's eastern arm, with the 4,000-metre peaks of the Chugach Mountains rising directly behind the city and the Turnagain Arm carrying one of the world's largest tidal bores — a six-to-ten-foot wall of water that local surfers ride twice daily. The Tony Knowles Coastal Trail traces eighteen kilometres of shoreline past Earthquake Park and Point Woronzof, with beluga whales surfacing offshore. Swimming is not the point here, as the water peaks at only 10–12 °C in August, with Ted Stevens airport fifteen minutes from downtown.