Petersburg, AK Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Petersburg, a community in Petersburg Borough County, Alaska.
Today
53°F
Rain Showers
Rain showers and patchy fog. Cloudy, with a high near 53. Southeast wind around 15 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Petersburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 53°F | Rain Showers | 15 mph SE | 100% |
| Tonight | 48°F | Rain Showers | 15 to 20 mph SE | 100% |
| Sunday | 52°F | Showers And Thunderstorms | 10 to 15 mph SE | 100% |
| Sunday Night | 42°F | Showers And Thunderstorms | 10 mph SE | 100% |
| Monday | 50°F | Rain Showers | 5 to 10 mph SE | 100% |
| Monday Night | 39°F | Rain Showers | 5 to 15 mph SE | 100% |
| Tuesday | 50°F | Rain Showers | 10 to 15 mph SE | 100% |
| Tuesday Night | 38°F | Rain Showers | 10 mph SE | 100% |
| Wednesday | 49°F | Rain Showers | 10 mph SE | 96% |
| Wednesday Night | 38°F | Rain Showers | 10 mph SE | 78% |
| Thursday | 51°F | Chance Rain Showers | 5 to 10 mph SE | 31% |
| Thursday Night | 37°F | Chance Rain Showers | 5 mph SE | 25% |
| Friday | 52°F | Chance Rain Showers | 5 mph SE | 33% |
| Friday Night | 39°F | Chance Rain Showers | 5 mph E | 51% |
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 Sep 19, 2026.