A Flood Warning for a Glacial Lake Outburst Flood has been issued for Mendenhall Lake and Mendenhall River. Click here to go to our Monitoring page...

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Juneau, AK Local Forecast Office

Petersburg AK

Marine Point Forecast

[NOTICE]

Today
High: 74 °F
Light Wind
< 1ft
Tonight
Low: 56 °F
Light Wind
< 1ft
Friday
High: 75 °F
Light Wind
< 1ft
Friday Night
Low: 57 °F
Light Wind
< 1ft
Saturday
High: 76 °F
Light Wind
< 1ft
Saturday Night
Low: 57 °F
Light Wind
< 1ft
Sunday
High: 71 °F
Light Wind
< 1ft
Sunday Night
Low: 55 °F
Light Wind
< 1ft
Monday
High: 66 °F
Light Wind
< 1ft

High and low forecast temperature values represent air temperature.

Water temperature forecast is experimental.

Associated Zone Forecast which includes this point

Last Update: 6:24 am AKDT Aug 13, 2026
Forecast Valid: 9am AKDT Aug 13, 2026-6pm AKDT Aug 19, 2026

View Nearby Observations

Detailed Forecast

Synopsis: High pressure in the Gulf will linger through the end of the week into the weekend. Winds moderate to fresh for the outer coastal waters and N-S oriented channels will diminish into the weekend. Localized wind shifts due to sea breezes possible, but overall wind pattern is expected to be N to NW. Seas 5 to 7 feet in outer coastal waters will trend downward by the weekend.

A Marine Weather Statement is in effect for Stephens Passage due to trees and other debris in the waters due to the ongoing Mendenhall River flood.

Today

Variable winds 5 kt or less. Sunny. Seas 1 ft or less.

Tonight

Variable winds 5 kt or less. Mostly clear. Seas 1 ft or less.

Friday

Variable winds 5 kt or less. Mostly sunny. Seas 1 ft or less.

Friday Night

Variable winds 5 kt or less. Partly cloudy. Seas 1 ft or less.

Saturday

Variable winds 5 kt or less. Mostly sunny. Seas 1 ft or less.

Saturday Night

Variable winds 5 kt or less. Mostly clear. Seas 1 ft or less.

Sunday

Variable winds 5 kt or less. Mostly sunny. Seas 1 ft or less.

Sunday Night

Variable winds 5 kt or less. Mostly cloudy. Seas 1 ft or less.

Monday

Variable winds 5 kt or less. Mostly sunny. Seas 1 ft or less.

*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.