Weather & Climate in Ketchikan, AK

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Ketchikan experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 36°F in January while summers reach 59°F in July. Annual precipitation totals 149.5 inches (wetter than the 38-inch national average). The area receives 34.8 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 515 feet.

Temperature

36°F Jan (2°C) 59°F Jul (15°C)
Annual Average46.0°F
15% below US avg
January Average36°F (2°C)
July Average59°F (15°C)

Geography

Elevation515 ft (157 m)
Area4.9 sq mi (12.7 km²)
Population Density2,128/sq mi
Coordinates55.3571°N, 131.6746°W
TimezoneAmerica/Anchorage
CountyKetchikan Gateway Borough County
Nearest AirportKetchikan International (KTN)
1 miles away

Precipitation & Snow

Annual Rainfall 149.5"
293% above US avg
Snowfall 34.8"
Wettest Month (Oct) 18.37"
Driest Month (Jun) 7.02"

Air Quality

Natural Hazard Risk

Overall RiskVery Low
Risk Score1.7 / 100
Social Vulnerability28.1 / 100
Community Resilience68.6 / 100

Hazard Breakdown

Tornado Very Low
Earthquake Very Low
Wildfire Very Low
Flood Very Low
Hail No Rating
Strong Wind No Rating
Winter Weather Relatively Low
Lightning Very Low
Ice Storm Very Low
Drought No Rating
Cold Wave No Rating
Landslide Relatively Low
Coastal Flood Very Low
Tsunami Very Low
Volcano Very Low
Avalanche Relatively Moderate
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

17 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.3.

Apr 29, 2013 60 km ENE of Thoms Place, Alaska M4.3 116 km 13 km
Nov 8, 2009 29 km S of Hydaburg, Alaska M3.9 84 km 15 km
May 8, 2003 87 km W of Prince Rupert, Canada M3.5 127 km 17 km
Apr 6, 2010 34 km SW of Craig, Alaska M3.3 120 km 18 km
Nov 2, 1997 12 km SSE of Kasaan, Alaska M3.3 44 km 0 km
Nov 8, 2009 34 km SSE of Hydaburg, Alaska M3.2 80 km 10 km
Jan 18, 2008 17 km E of Hyder, Alaska M3.1 137 km 5 km
Apr 12, 2019 22 km WNW of Hyder, Alaska M3.0 108 km 8 km
Jan 18, 2008 11 km N of Hyder, Alaska M2.9 125 km 16 km
Jun 9, 2007 85 km SSW of Metlakatla, Alaska M2.8 106 km 14 km
May 7, 2004 48 km ENE of Wrangell, Alaska M2.8 142 km 6 km
May 12, 2016 20 km NW of Hyder, Alaska M2.8 119 km 4 km
Sep 11, 2015 5 km SE of Hyder, Alaska M2.8 123 km 11 km
Nov 9, 2009 25 km SSE of Hydaburg, Alaska M2.8 80 km 15 km
Apr 12, 1992 56 km SSE of Hydaburg, Alaska M2.7 82 km 10 km
Nov 8, 2009 29 km SSE of Hydaburg, Alaska M2.7 74 km 4 km
Nov 8, 2009 35 km SE of Hydaburg, Alaska M2.5 70 km 10 km
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.

Nearby Volcanoes

3 volcanoes within 200 km. Closest: Tlevak Strait-Suemez Is. (104 km).

Name Type Elevation Last Eruption Distance
Tlevak Strait-Suemez Is. Volcanic field 50 m (164 ft) Unknown 104 km
Iskut-Unuk River Cones Pyroclastic cone(s) 1,880 m (6,168 ft) 1800 153 km
Hoodoo Mountain Subglacial 1,850 m (6,070 ft) -7050 160 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 36°F (2°C) 16.2 in Coldest
February 36°F (2°C) 11.8 in
March 38°F (3°C) 11.0 in
April 44°F (6°C) 10.3 in
May 50°F (10°C) 8.7 in
June 55°F (13°C) 7.0 in Driest
July 59°F (15°C) 7.3 in
August 59°F (15°C) 11.3 in Warmest
September 54°F (12°C) 14.3 in
October 46°F (8°C) 18.4 in Wettest
November 40°F (4°C) 17.1 in
December 36°F (2°C) 16.3 in

Ketchikan has a seasonal temperature swing of 23°F / from 36°F in January to 59°F in August. Total annual precipitation is 149.5 inches, with October being the wettest month (18.4") and June the driest (7.0").

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