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.

Overnight

50°F

Rain Showers

Rain showers. Cloudy, with a low around 50. South wind around 5 mph. Chance of precipitation is 80%.

7-day forecast for Koyukuk

When	Temp	Forecast	Wind	Precip
Overnight	50°F	Rain Showers	5 mph S	82%
Tuesday	63°F	Showers And Thunderstorms Likely	5 to 15 mph SE	82%
Tuesday Night	50°F	Showers And Thunderstorms Likely	10 to 15 mph S	74%
Wednesday	62°F	Rain Showers Likely	10 mph S	74%
Wednesday Night	50°F	Rain Showers Likely	5 to 10 mph SE	67%
Thursday	63°F	Rain Showers	5 to 10 mph SE	78%
Thursday Night	48°F	Rain Showers	5 to 10 mph S	78%
Friday	64°F	Chance Rain Showers	5 mph W	54%
Friday Night	49°F	Chance Rain Showers	5 mph SW	48%
Saturday	63°F	Chance Rain Showers	5 mph SW	43%
Saturday Night	50°F	Chance Rain Showers	5 mph SW	43%
Sunday	64°F	Chance Rain Showers	5 mph SW	32%
Sunday Night	51°F	Chance Rain Showers	5 mph W	32%
Monday	68°F	Chance Rain Showers	5 mph W	31%

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

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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 Aug 4, 2026.