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Weather & Climate in Port Alsworth, AK
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Port Alsworth has a cool climate with an average annual temperature of 35°F (2°C). Winters average 14°F in January while summers reach 57°F in July. The area gets 269 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 23.6 inches (drier than the 38-inch national average). 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 724 feet.
Temperature
14°F Jan (-10°C)
57°F Jul (14°C)
| Annual Average | 34.8°F |
| 36% below US avg | |
| January Average | 14°F (-10°C) |
| July Average | 57°F (14°C) |
| Sunny Days | 269 days/yr |
Geography
| Elevation | 724 ft (221 m) |
| Area | 22.7 sq mi (58.8 km²) |
| Population Density | 8/sq mi |
| Coordinates | 60.1567°N, 154.3396°W |
| Timezone | America/Anchorage |
| County | Kenai Peninsula Borough County |
| Nearest Airport | Ted Stevens Anchorage International (ANC) 163 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 21.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 93.0 / 100 |
| Social Vulnerability | 47.1 / 100 |
| Community Resilience | 6.5 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | No Rating |
| Winter Weather | Relatively High |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Relatively Moderate |
| Coastal Flood | Very Low |
| Tsunami | Relatively Moderate |
| Volcano | Relatively Low |
| Avalanche | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
7,764 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M7.1.
| Jan 24, 2016 | 47 km ESE of Pedro Bay, Alaska | M7.1 | 82 km | 126 km |
| Jul 29, 2015 | 52 km ENE of Pedro Bay, Alaska | M6.4 | 70 km | 119 km |
| Jul 9, 1998 | 73 km WNW of Ninilchik, Alaska | M6.1 | 87 km | 131 km |
| Jan 24, 2009 | Southern Alaska | M5.9 | 115 km | 98 km |
| Nov 20, 1993 | 66 km ENE of Pedro Bay, Alaska | M5.9 | 74 km | 121 km |
| May 19, 2000 | 63 km WSW of Nanwalek, Alaska | M5.8 | 145 km | 75 km |
| May 10, 2014 | 23 km WNW of Happy Valley, Alaska | M5.8 | 124 km | 89 km |
| Feb 12, 1995 | 67 km SE of Pedro Bay, Alaska | M5.6 | 105 km | 110 km |
| Mar 2, 2017 | 48 km WNW of Nanwalek, Alaska | M5.6 | 114 km | 78 km |
| May 12, 1992 | 37 km ESE of Pedro Bay, Alaska | M5.5 | 71 km | 139 km |
| Aug 13, 1990 | 13 km NW of Happy Valley, Alaska | M5.5 | 135 km | 72 km |
| Jan 25, 2001 | 39 km WNW of Ninilchik, Alaska | M5.5 | 110 km | 83 km |
| May 19, 2005 | 54 km W of Happy Valley, Alaska | M5.4 | 93 km | 96 km |
| Oct 17, 1996 | 70 km WNW of Happy Valley, Alaska | M5.4 | 77 km | 117 km |
| Mar 19, 2023 | 19 km SSW of Anchor Point, Alaska | M5.4 | 149 km | 65 km |
| May 7, 2017 | 14 km N of Ninilchik, Alaska | M5.3 | 147 km | 67 km |
| Mar 9, 1990 | 44 km NW of Ninilchik, Alaska | M5.3 | 115 km | 85 km |
| Apr 18, 1999 | 17 km WNW of Clam Gulch, Alaska | M5.2 | 147 km | 55 km |
| Sep 10, 2002 | 67 km ENE of Pedro Bay, Alaska | M5.2 | 83 km | 117 km |
| Mar 10, 2013 | 31 km SSE of Pope-Vannoy Landing, Alaska | M5.2 | 94 km | 9 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 9.1 m (30 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1883 | COOK INLET, AK | Explosion | 9.1 m | 8 | 99 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
3 volcanoes within 200 km. Closest: Iliamna (71 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Iliamna | Stratovolcano | 3,053 m (10,016 ft) | 1876 | 71 km |
| Augustine | Lava dome(s) | 1,252 m (4,108 ft) | 2006 | 102 km |
| Spurr | Stratovolcano | 3,374 m (11,070 ft) | 1992 | 170 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
11 wildfires (100+ acres) recorded within 100 km. Largest: KOKTULI RIVER (296,656 acres, 2022).
| Year | Name | Acres Burned | Distance |
| 2022 | KOKTULI RIVER | 296,656 | 99 km |
| 2022 | UPPER TALARIK | 10,090 | 58 km |
| 2013 | NIKUBUMA LAKE | 9,084 | 64 km |
| 2022 | TELAQUANA RIVER | 8,081 | 96 km |
| 2019 | PETE ANDREWS CREEK | 5,989 | 65 km |
| 2003 | ILIAMNA | 5,295 | 52 km |
| 2013 | WHITEFISH LAKE | 4,414 | 98 km |
| 2005 | STONY | 3,211 | 97 km |
| 2013 | CURRANT CREEK | 1,986 | 27 km |
| 2015 | OLD VILLAGE | 1,986 | 90 km |
| 2016 | CHILIKADROTNA RIVER | 1,435 | 72 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 14°F (-10°C) | 1.3 in | Coldest |
| February | 15°F (-10°C) | 1.1 in | Driest |
| March | 20°F (-7°C) | 1.3 in | |
| April | 30°F (-1°C) | 1.1 in | |
| May | 41°F (5°C) | 1.3 in | |
| June | 50°F (10°C) | 2.0 in | |
| July | 57°F (14°C) | 2.4 in | Warmest |
| August | 52°F (11°C) | 3.6 in | Wettest |
| September | 45°F (7°C) | 3.4 in | |
| October | 32°F (-0°C) | 2.4 in | |
| November | 21°F (-6°C) | 1.8 in | |
| December | 14°F (-10°C) | 1.7 in |
Port Alsworth has a seasonal temperature swing of 42°F / from 14°F in January to 57°F in July. Total annual precipitation is 23.3 inches, with August being the wettest month (3.6") and February the driest (1.1").