Koyukuk, AK Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Koyukuk, a city in Yukon-Koyukuk Census Area County, Alaska.
This Afternoon
27°F
Mostly Sunny
Mostly sunny, with a high near 27. North wind around 10 mph.
7-day forecast for Koyukuk
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 27°F | Mostly Sunny | 10 mph N | 0% |
| Tonight | 19°F | Mostly Clear | 10 to 15 mph N | 0% |
| Wednesday | 27°F | Partly Sunny | 10 to 15 mph N | 8% |
| Wednesday Night | 20°F | Chance Light Snow | 5 to 10 mph N | 35% |
| Thursday | 27°F | Chance Light Snow | 5 to 10 mph N | 35% |
| Thursday Night | 18°F | Slight Chance Light Snow then Mostly Cloudy | 5 mph N | 20% |
| Friday | 27°F | Partly Sunny | 5 mph N | 9% |
| Friday Night | 19°F | Mostly Cloudy | 5 mph N | 9% |
| Saturday | 25°F | Mostly Cloudy | 5 mph N | 12% |
| Saturday Night | 18°F | Mostly Cloudy | 5 mph N | 12% |
| Sunday | 24°F | Cloudy | 5 to 10 mph N | 14% |
| Sunday Night | 16°F | Mostly Cloudy | 5 to 10 mph NE | 14% |
| Monday | 22°F | Partly Sunny | 5 to 10 mph N | 5% |
| Monday Night | 14°F | Mostly Cloudy | 10 mph N | 5% |
Forecast source: National Weather Service (api.weather.gov) for Koyukuk (64.902, -157.694). Updated through the day.
Growing snapshot for Koyukuk
Last spring frost
May 18
First fall frost
Sep 8
Growing season
111 days
More local growing data for Koyukuk: nearby ZIP 99754 weather · frost dates · planting calendar · Alaska frost dates
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Climate data from the nearest NOAA station, Galena, Ak (26.5 mi from Koyukuk). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.