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Weather & Climate in Alsea, OR

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

Alsea experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 41°F in January while summers reach 62°F in July. The area gets 251 sunny days per year, above the national average. Annual precipitation totals 91.9 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 32. The city sits at an elevation of 297 feet.

Temperature

41°F Jan (5°C) 62°F Jul (17°C)
Annual Average50.4°F
7% below US avg
January Average41°F (5°C)
July Average62°F (17°C)
Sunny Days251 days/yr

Geography

Elevation297 ft (91 m)
Area0.2 sq mi (0.4 km²)
Population Density806/sq mi
Coordinates44.3818°N, 123.5958°W
TimezoneAmerica/Los_Angeles
CountyBenton County County
Nearest AirportMahlon Sweet Field (EUG)
26 miles away

Precipitation & Snow

Annual Rainfall 91.9"
142% above US avg
Snowfall 0.8"
Wettest Month (Dec) 15.79"
Driest Month (Jul) 0.91"

Air Quality

AQI Median32.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively Moderate
Risk Score84.4 / 100
Social Vulnerability18.5 / 100
Community Resilience97.0 / 100

Hazard Breakdown

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

Earthquake History

104 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.6.

Mar 25, 1993 4 km E of Scotts Mills, Oregon M5.6 107 km 20 km
Jul 12, 2004 30 km W of Yachats, Oregon M4.9 71 km 29 km
Aug 19, 2004 19 km W of Newport, Oregon M4.7 64 km 27 km
Jul 4, 2015 16 km ENE of Springfield, Oregon M4.1 69 km 8 km
Apr 15, 2017 43 km WNW of Yachats, Oregon M3.9 82 km 38 km
Feb 8, 1995 9 km ESE of Hubbard, Oregon M3.8 110 km 24 km
Mar 20, 2012 29 km WNW of Yachats, Oregon M3.7 68 km 33 km
Jun 8, 1993 5 km ESE of Scotts Mills, Oregon M3.7 107 km 19 km
Jul 3, 1992 57 km W of Waldport, Oregon M3.6 95 km 21 km
Feb 24, 1999 8 km WSW of Molalla, Oregon M3.6 110 km 34 km
May 19, 2019 3 km ESE of Rose Lodge, Oregon M3.6 71 km 44 km
Sep 8, 2012 8 km N of Scotts Mills, Oregon M3.5 109 km 24 km
Aug 2, 1996 4 km S of Scotts Mills, Oregon M3.5 101 km 29 km
Nov 25, 1999 5 km NNE of Mount Angel, Oregon M3.4 104 km 28 km
Apr 7, 2014 6 km NW of Sherwood, Oregon M3.3 125 km 19 km
Mar 4, 2006 16 km ENE of Siletz, Oregon M3.3 42 km 43 km
Jul 13, 2004 32 km W of Yachats, Oregon M3.3 73 km 29 km
Mar 25, 1993 5 km ESE of Scotts Mills, Oregon M3.2 107 km 13 km
Jul 12, 2007 1 km N of Barlow, Oregon M3.2 120 km 23 km
Mar 20, 2012 27 km WNW of Yachats, Oregon M3.2 67 km 29 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

34 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 3 injuries.

Date Rating Distance Path Fatalities
Dec 14, 2010 EF2 76 km 5.0 mi 0
Sep 1, 2017 EF1 75 km 0.7 mi 0
Jun 13, 2013 EF1 98 km 0.3 mi 0
Jun 21, 2003 EF1 62 km 0.3 mi 0
Nov 24, 1989 EF1 59 km 0.3 mi 0
Mar 8, 1960 EF1 71 km 1.0 mi 0
Dec 6, 1951 EF1 37 km 0.3 mi 0
Oct 31, 2024 EF0 45 km 0.2 mi 0
Jun 18, 2023 EF0 43 km 0.3 mi 0
Oct 29, 2018 EF0 64 km 0.1 mi 0
Apr 14, 2015 EF0 61 km 0.1 mi 0
Nov 6, 2009 EF0 77 km 0.1 mi 0
Jun 4, 2009 EF0 34 km 1.5 mi 0
Sep 28, 2007 EF0 59 km 1.0 mi 0
Dec 16, 2006 EF0 91 km 1.5 mi 0
Dec 2, 1999 EF0 69 km 2.3 mi 0
Oct 3, 1998 EF0 93 km 0.1 mi 0
Sep 18, 1997 EF0 94 km 0.5 mi 0
Sep 18, 1997 EF0 82 km 0.5 mi 0
Sep 17, 1997 EF0 79 km 0.5 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Tsunami History

1 tsunami recorded within 500 km.

Year Location Cause Max Wave Deaths Distance
1700 CASCADIA SUBDUCTION ZONE Earthquake — 2 131 km
Source: NOAA/NCEI Historical Tsunami Database.

Nearby Volcanoes

8 volcanoes within 200 km. Closest: Sand Mountain Field (132 km).

Name Type Elevation Last Eruption Distance
Sand Mountain Field Pyroclastic cone(s) 1,664 m (5,459 ft) -950 132 km
Belknap Shield(s) 2,095 m (6,873 ft) 480 140 km
Jefferson Stratovolcano 3,199 m (10,495 ft) 950 146 km
Three Sisters Complex 3,159 m (10,364 ft) 440 148 km
Bachelor Stratovolcano 2,763 m (9,065 ft) -5800 159 km
Davis Lake Volcanic field 2,163 m (7,096 ft) -2790 168 km
Cinnamon Butte Pyroclastic cone(s) 1,956 m (6,417 ft) Unknown 174 km
Hood Stratovolcano 3,426 m (11,240 ft) 1866 186 km
Source: Smithsonian Institution Global Volcanism Program (GVP).

Wildfire History

9 wildfires (100+ acres) recorded within 100 km. Largest: HOLIDAY FARM (174,390 acres, 2020).

Year Name Acres Burned Distance
2020 HOLIDAY FARM 174,390 91 km
2023 BEDROCK 31,692 97 km
2017 JONES 10,260 96 km
1987 ROCKHOUSE 5,011 59 km
2003 CLARK 4,905 94 km
2020 ECHO MTN COMPLEX 2,161 75 km
1999 AUSTA 1,525 42 km
1987 87552212 1,166 49 km
1987 87791147 1,048 84 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 41°F (5°C) 14.3 in
February 42°F (6°C) 11.4 in
March 44°F (7°C) 10.4 in
April 47°F (8°C) 6.3 in
May 51°F (11°C) 4.0 in
June 56°F (14°C) 2.5 in
July 62°F (17°C) 0.9 in Warmest, Driest
August 62°F (17°C) 1.4 in
September 59°F (15°C) 3.0 in
October 52°F (11°C) 6.3 in
November 44°F (7°C) 14.0 in
December 40°F (4°C) 15.8 in Coldest, Wettest

Alsea has a seasonal temperature swing of 22°F / from 40°F in December to 62°F in July. Total annual precipitation is 90.2 inches, with December being the wettest month (15.8") and July the driest (0.9").

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