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.
Today
46°F
Rain Showers
Rain showers. Cloudy, with a high near 46. North wind around 5 mph. Chance of precipitation is 80%.
7-day forecast for Koyukuk
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 46°F | Rain Showers | 5 mph N | 80% |
| Tonight | 35°F | Rain Showers Likely | 5 to 10 mph NW | 67% |
| Sunday | 42°F | Mostly Cloudy | 5 to 10 mph NW | 2% |
| Sunday Night | 32°F | Mostly Cloudy | 5 to 10 mph NW | 1% |
| Monday | 42°F | Partly Sunny | 5 to 10 mph W | 2% |
| Monday Night | 32°F | Mostly Cloudy | 5 to 10 mph W | 6% |
| Tuesday | 46°F | Mostly Cloudy | 5 mph W | 2% |
| Tuesday Night | 33°F | Mostly Cloudy | 5 mph SW | 4% |
| Wednesday | 47°F | Mostly Cloudy | 5 mph S | 11% |
| Wednesday Night | 34°F | Slight Chance Rain And Snow Showers | 5 mph SE | 22% |
| Thursday | 48°F | Chance Rain And Snow Showers | 5 to 15 mph E | 51% |
| Thursday Night | 38°F | Rain Showers Likely | 10 to 15 mph E | 60% |
| Friday | 51°F | Rain Showers Likely | 10 mph E | 59% |
| Friday Night | 39°F | Chance Rain Showers | 5 to 10 mph E | 51% |
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
Nearby towns & communities
Alatna
Allakaket
Aniak
Anvik
Arctic Village
Beaver
Bettles
Birch Creek
Central
Chalkyitsik
Chuathbaluk
Circle
Coldfoot
Evansville
Four Mile Road
Galena
Grayling
Holy Cross
Hughes
Huslia
Kaltag
Lake Minchumina
Livengood
Manley Hot Springs
McGrath
Minto
Nenana
Nikolai
Nulato
Rampart
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 Sep 19, 2026.