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Weather & Climate in Koyuk, AK
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Koyuk has a cool climate with an average annual temperature of 23°F (-5°C). Winters average -4°F in January while summers reach 54°F in July. The area gets 200 sunny days per year. Air quality is rated Good with a median AQI of 21 / among the cleanest air in the country. The city sits at an elevation of 69 feet.
Temperature
-4°F Jan (-20°C)
54°F Jul (12°C)
| Annual Average | 23.2°F |
| 57% below US avg | |
| January Average | -4°F (-20°C) |
| July Average | 54°F (12°C) |
| Sunny Days | 200 days/yr |
Geography
| Elevation | 69 ft (21 m) |
| Area | 5.1 sq mi (13.2 km²) |
| Population Density | 60/sq mi |
| Coordinates | 64.9411°N, 161.1455°W |
| Timezone | America/Anchorage |
| County | Kusilvak Census Area County |
| Nearest Airport | Fairbanks International (FAI) 389 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 21.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 57.9 / 100 |
| Social Vulnerability | 100.0 / 100 |
| Community Resilience | 5.9 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | No Rating |
| Hail | Very Low |
| Strong Wind | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | No Rating |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
| Coastal Flood | No Rating |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
176 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.5.
| Jul 6, 2006 | 36 km NNE of Koyuk, Alaska | M4.5 | 36 km | 10 km |
| Dec 15, 1997 | 17 km E of Golovin, Alaska | M4.5 | 84 km | 25 km |
| May 17, 1999 | 15 km ENE of Kaltag, Alaska | M4.5 | 145 km | 10 km |
| Apr 30, 2001 | 22 km SW of White Mountain, Alaska | M4.4 | 130 km | 10 km |
| May 18, 1995 | 15 km N of Elim, Alaska | M4.3 | 59 km | 25 km |
| Jun 16, 2023 | 30 km SSW of White Mountain, Alaska | M4.3 | 132 km | 15 km |
| Jul 28, 2005 | 18 km SSW of White Mountain, Alaska | M4.3 | 125 km | 23 km |
| Apr 19, 2024 | 48 km SW of Buckland, Alaska | M4.2 | 84 km | 9 km |
| Jul 31, 1993 | 10 km SSW of Elim, Alaska | M4.0 | 74 km | -3 km |
| Aug 23, 1998 | 81 km SW of Deering, Alaska | M4.0 | 139 km | 21 km |
| Jul 21, 1998 | northern Alaska | M4.0 | 56 km | 10 km |
| Sep 18, 2024 | 19 km WSW of Unalakleet, Alaska | M4.0 | 125 km | 11 km |
| Jul 21, 2005 | 8 km SSW of White Mountain, Alaska | M3.9 | 117 km | 19 km |
| Jun 13, 2023 | 29 km WSW of Golovin, Alaska | M3.9 | 130 km | 22 km |
| Nov 21, 2000 | 26 km ENE of Kaltag, Alaska | M3.9 | 149 km | 10 km |
| May 25, 1996 | 9 km SE of Golovin, Alaska | M3.9 | 96 km | 10 km |
| Feb 6, 2001 | 31 km W of Kaltag, Alaska | M3.8 | 108 km | 22 km |
| May 25, 1996 | 8 km WNW of Golovin, Alaska | M3.8 | 107 km | 10 km |
| Jul 12, 2005 | 12 km SSW of White Mountain, Alaska | M3.8 | 118 km | 15 km |
| Jan 27, 2022 | 53 km S of Elim, Alaska | M3.7 | 106 km | 15 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Nearby Volcanoes
2 volcanoes within 200 km. Closest: Imuruk Lake (125 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Imuruk Lake | Shield(s) | 610 m (2,001 ft) | 300 | 125 km |
| St. Michael | Shield(s) | 715 m (2,346 ft) | Unknown | 172 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
16 wildfires (100+ acres) recorded within 100 km. Largest: NORTH RIVER (111,059 acres, 2019).
| Year | Name | Acres Burned | Distance |
| 2019 | NORTH RIVER | 111,059 | 51 km |
| 2015 | KOYUK | 23,101 | 35 km |
| 2013 | SHAKTOOLIK RIVER | 11,972 | 100 km |
| 1997 | PEACE RIVER | 7,959 | 35 km |
| 2015 | UNGALIK | 7,557 | 57 km |
| 2004 | CLIFF CREEK | 5,966 | 90 km |
| 2005 | BOX RIVER | 5,730 | 100 km |
| 2015 | SHAKTOOLIK | 4,937 | 71 km |
| 2004 | EAST FORK KOYUKUK | 3,573 | 47 km |
| 2010 | TIPOOKTULEARUK RIVER | 3,185 | 41 km |
| 2017 | RIVER NORTH | 3,108 | 89 km |
| 2019 | SALMON CREEK | 2,986 | 44 km |
| 2019 | KATEEL RIVER | 2,517 | 73 km |
| 2018 | FAIRHAVEN CREEK | 1,931 | 91 km |
| 1984 | 414057 | 1,689 | 73 km |
| 2019 | KUZITRIN RIVER 9 | 1,609 | 84 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | -4°F (-20°C) | 0.7 in | Coldest |
| February | 3°F (-16°C) | 0.6 in | |
| March | 7°F (-14°C) | 0.5 in | Driest |
| April | 20°F (-7°C) | 0.6 in | |
| May | 37°F (3°C) | 0.5 in | |
| June | 51°F (11°C) | 0.9 in | |
| July | 54°F (12°C) | 1.9 in | Warmest |
| August | 52°F (11°C) | 3.2 in | Wettest |
| September | 44°F (6°C) | 2.4 in | |
| October | 27°F (-3°C) | 1.1 in | |
| November | 13°F (-11°C) | 0.8 in | |
| December | 3°F (-16°C) | 0.8 in |
Koyuk has a seasonal temperature swing of 58°F / from -4°F in January to 54°F in July. Total annual precipitation is 14.0 inches, with August being the wettest month (3.2") and March the driest (0.5").