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Weather in Petersburg, AK · National Weather Service + NOAA

Petersburg stays cool in summer

Petersburg has chilly, snowy winters and cool summers, with plenty of rain. A typical July afternoon reaches 62°, a January night drops to 27°, and about 86 inches of snow falls in a normal winter. In November, a normal day reaches 39° and a normal night drops to 32°.

Winter 36°/28°Spring 48°/35°Summer 61°/50°Fall 47°/39°
Right now
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Sunrise 11:10 am · sunset 7:59 pm

Getting the latest forecast from the National Weather Service…

What stands out about Petersburg’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
Cool summersJuly afternoons average 62°, cooler than 100% of U.S. towns.Milder winters than most of AlaskaJanuary nights average 27°, milder than 191 of 213 Alaska towns.A wet climate110 inches of rain and melted snow a year, more than 100% of U.S. towns.A long growing season169 frost-free days, from Apr 29 to Oct 17.
A normal year

Where today sits in Petersburg’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
36° / 28°
24 days with an inch or more of snow
Spring
48° / 35°
Last frost around Apr 29
Summer
61° / 50°
90° days are rare
Fall now
47° / 39°
First frost around Oct 17
Pastthe usual first frost (Oct 17). Last frost next spring: Apr 29
Best months to be outside
No month sits in the comfortable 62–84° range. Summer is the mild season here.
How much snow does Petersburg get?About 86 inches a winter.When is it wettest?September, with 14.4 inches.What is each month like?Highs, lows, rain and snow for all 12.

Weather talk

Road reports, first frosts and storm memories from neighbors in Petersburg.

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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020. Temperatures and rainfall come from the nearest weather station. Snow, frost dates and day counts: the NOAA station at Petersburg 1, AK (4 mi). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.