Anchorage sea temperature today: 13°C – beach water temperature, Anchorage, United States
United States · Gulf of Alaska
Anchorage
Sea
13.3°C55.9°F
Air
UV
Get a wetsuit
⁦13–18°C⁩

Last updated ·

Today, September 13, the sea temperature at Anchorage is 13.3 °C (56 °F). That is 1.3 °C warmer than the usual 12 °C in September. Rarely comfortable for swimming.

Climate · monthly averages

Sea temperature by month

5-year averages (2021–2025). Min/Max are typical daily lows and highs, not record extremes.

Warmest in August (14.6°C). Coldest in March (1.6°C). Rarely comfortable for swimming.

5-year averages (2021–2025). Min/Max are typical daily lows and highs, not record extremes.
MonthSea · MinSea · AvgSea · MaxAir · MinAir · AvgAir · Max
January1.8°C2.3°C2.7°C-6.1°C-5.8°C-4.5°C
February1.2°C1.8°C2.2°C-7.7°C-6.6°C-4.5°C
March1.3°C1.6°C1.8°C-6.3°C-4.4°C-1.3°C
April1.2°C1.8°C2.6°C-1.9°C0.5°C3.5°C
May5.3°C6.3°C7.3°C3.6°C5.6°C8.2°C
June10.1°C11.5°C13.3°C9.4°C11.4°C14.1°C
July13.2°C14.2°C15.0°C11.3°C13.0°C15.4°C
August13.8°C14.6°C15.2°C10.3°C12.2°C14.6°C
September11.8°C12.0°C12.5°C6.0°C7.6°C10.1°C
October6.9°C7.5°C8.4°C0.5°C1.7°C3.8°C
November2.4°C2.9°C3.3°C-6.8°C-6.3°C-4.9°C
December1.3°C2.0°C2.8°C-8.8°C-8.6°C-7.7°C

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 °C50–54 °F in August, with Ted Stevens airport fifteen minutes from downtown.

Frequently asked questions

Today, September 13, the sea at Anchorage is 13.3 °C (56 °F)56 °F (13.3 °C) – cold, most people reach for a wetsuit. The usual September average is 12 °C54 °F.

No single number works for everyone, so the scale on this page is only a guide to how the water feels: below 13 °C55 °F icy, 13–18 °C55–64 °F cold, 18–23 °C64–73 °F refreshing, 23–28 °C73–82 °F pleasantly warm and above 28 °C82 °F like a bath. Right now the sea at Anchorage is 13.3 °C56 °F.

In May the sea at Anchorage (Gulf of Alaska, United States) averages 6.3 °C43 °F – cold-water swimmers only. It keeps warming until August, when it peaks at 14.6 °C58 °F.

In October the sea at Anchorage (Gulf of Alaska, United States) still averages 7.5 °C46 °F – cold-water swimmers only. It peaks in August at 14.6 °C58 °F and cools slowly from there.