Kupreanof, AK Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Kupreanof, a city in Petersburg Borough County, Alaska.
Today
56°F
Rain Showers
Rain showers and patchy fog. Cloudy, with a high near 56. Southeast wind 10 to 15 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
7-day forecast for Kupreanof
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 56°F | Rain Showers | 10 to 15 mph SE | 100% |
| Tonight | 50°F | Rain Showers | 10 to 15 mph SE | 100% |
| Sunday | 56°F | Showers And Thunderstorms | 10 mph SE | 100% |
| Sunday Night | 44°F | Showers And Thunderstorms | 5 to 10 mph SE | 100% |
| Monday | 53°F | Rain Showers | 5 mph SE | 100% |
| Monday Night | 41°F | Rain Showers | 5 to 10 mph SE | 100% |
| Tuesday | 52°F | Rain Showers | 10 mph SE | 100% |
| Tuesday Night | 40°F | Rain Showers | 5 to 10 mph SE | 100% |
| Wednesday | 51°F | Rain Showers | 5 to 10 mph SE | 92% |
| Wednesday Night | 40°F | Rain Showers | 5 to 10 mph SE | 77% |
| Thursday | 54°F | Chance Rain Showers | 5 mph SE | 30% |
| Thursday Night | 40°F | Slight Chance Rain Showers | 0 to 5 mph SE | 24% |
| Friday | 55°F | Chance Rain Showers | 0 to 5 mph SE | 33% |
| Friday Night | 41°F | Chance Rain Showers | 5 mph SE | 51% |
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 Sep 19, 2026.