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Anchorage, AK Local Forecast Office

20NM SSE Shumagin Islands AK

Marine Point Forecast

[NOTICE]

Today
High: 47 °F
SSE 25kt
7-8ft

Small Craft Advisory
Tonight
Low: 43 °F
SSE 15kt
7-8ft

Small Craft Advisory
Thursday
High: 45 °F
SSE 15kt
5-7ft
Thursday Night
Low: 42 °F
ENE 15kt
3-4ft
Friday
High: 44 °F
NE 15kt⇓
3ft
Friday Night
Low: 33 °F
NNW 20kt
2-3ft
Saturday
High: 39 °F
⇑NW 40kt
5-6ft
Saturday Night
Low: 22 °F
NW 35kt⇓
4-6ft
Sunday
High: 28 °F
NW 20kt
2-4ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 4:26 am AKST Dec 3, 2025
Forecast Valid: 9am AKST Dec 3, 2025-6pm AKST Dec 9, 2025

View Nearby Observations

Detailed Forecast

...SMALL CRAFT ADVISORY THROUGH THURSDAY...

Synopsis: A 980 mb low 80 nm S of Unalaska rotates to 100 nm S of Cold Bay at 1001 mb by Thu morning, then reverses course to 50 nm S of Unalaska and dissipates by Fri morning. The front of a Kamchatka low moves over Shemya Friday morning.

Today

SSE wind 20 to 25 kt. Showers. Seas 7 to 8 ft.

Tonight

SSE wind around 15 kt, with gusts as high as 25 kt. Showers likely. Seas 7 to 8 ft.

Thursday

SSE wind 10 to 15 kt becoming E in the afternoon. Winds could gust as high as 20 kt. Showers likely, mainly after 3pm. Seas 5 to 7 ft.

Thursday Night

ENE wind around 15 kt, with gusts as high as 30 kt. Showers likely, mainly before 9pm. Seas 3 to 4 ft.

Friday

NE wind 10 to 15 kt becoming NNW 5 to 10 kt in the afternoon. A chance of showers. Seas around 3 ft.

Friday Night

NNW wind 10 to 20 kt. A chance of rain showers, mixing with snow after midnight, then gradually ending. Seas 2 to 3 ft.

Saturday

NW wind 25 to 30 kt increasing to 35 to 40 kt in the morning. A chance of rain and snow between 9am and 3pm, then a chance of snow after 3pm. Seas 5 to 6 ft.

Saturday Night

NW wind 30 to 35 kt decreasing to 20 to 25 kt after midnight. A chance of snow. Seas 4 to 6 ft.

Sunday

NW wind 15 to 20 kt. A chance of snow. Seas 2 to 4 ft.

*Notices:

This forecast is for a single location. For safety concerns, mariners should be aware of the weather over a larger area. Forecast information for a larger area can be found within the zone forecast and the NDFD graphics.
The forecast conditions at a particular point may not exceed the criteria of a Small Craft Advisory, Gale, Storm etc. These watches/warnings/advisories are issued for the entire zone in which the point resides and mariners should act accordingly.