Petersburg, AK Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Petersburg, a community in Petersburg Borough County, Alaska.
Overnight
37°F
Heavy Rain
Rain. Cloudy, with a low around 37. Southeast wind 15 to 20 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Petersburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 37°F | Heavy Rain | 15 to 20 mph SE | 100% |
| Wednesday | 41°F | Heavy Rain | 10 to 15 mph SE | 80% |
| Wednesday Night | 38°F | Light Rain | 10 to 15 mph SE | 97% |
| Thursday | 41°F | Rain | 15 mph E | 100% |
| Thursday Night | 35°F | Rain | 20 mph SE | 100% |
| Friday | 40°F | Rain | 10 to 20 mph SE | 100% |
| Friday Night | 32°F | Light Rain | 10 to 15 mph SE | 100% |
| Saturday | 38°F | Rain And Snow | 5 to 10 mph E | 85% |
| Saturday Night | 31°F | Rain And Snow | 10 to 15 mph E | 100% |
| Sunday | 38°F | Rain And Snow | 10 to 15 mph SE | 100% |
| Sunday Night | 31°F | Rain And Snow | 10 to 15 mph SE | 78% |
| Monday | 39°F | Rain And Snow | 15 mph SE | 84% |
| Monday Night | 32°F | Light Rain | 15 to 20 mph SE | 100% |
| Tuesday | 40°F | Rain And Snow | 15 to 20 mph SE | 100% |
Forecast source: National Weather Service (api.weather.gov) for Petersburg (56.757, -132.875). Updated through the day.
Growing snapshot for Petersburg
Last spring frost
Apr 29
First fall frost
Oct 17
Growing season
169 days
More local growing data for Petersburg: nearby ZIP 99833 weather · frost dates · planting calendar · Alaska frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Petersburg 1, Ak (9.7 mi from Petersburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.