Kupreanof, AK Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Kupreanof, a city in Petersburg Borough County, Alaska.
Today
49°F
Rain
Rain. Cloudy, with a high near 49. East wind 5 to 10 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Kupreanof
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 49°F | Rain | 5 to 10 mph E | 100% |
| Tonight | 43°F | Rain | 5 mph SE | 100% |
| Thursday | 47°F | Heavy Rain | 10 to 20 mph SE | 100% |
| Thursday Night | 40°F | Rain | 15 mph SE | 100% |
| Friday | 47°F | Rain | 10 to 15 mph SE | 100% |
| Friday Night | 37°F | Light Rain | 5 to 10 mph SE | 100% |
| Saturday | 45°F | Light Rain | 5 mph E | 85% |
| Saturday Night | 36°F | Light Rain | 5 to 10 mph E | 100% |
| Sunday | 46°F | Light Rain | 10 mph SE | 100% |
| Sunday Night | 36°F | Light Rain | 10 mph SE | 77% |
| Monday | 46°F | Light Rain | 10 to 15 mph SE | 82% |
| Monday Night | 38°F | Light Rain | 10 to 15 mph SE | 100% |
| Tuesday | 47°F | Light Rain | 10 to 15 mph SE | 100% |
| Tuesday Night | 39°F | Light Rain | 5 to 10 mph SE | 100% |
Forecast source: National Weather Service (api.weather.gov) for Kupreanof (56.821, -132.972). Updated through the day.
Growing snapshot for Kupreanof
Last spring frost
Apr 29
First fall frost
Oct 17
Growing season
169 days
More local growing data for Kupreanof: 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 Kupreanof). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.