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Weather & Climate in Sedro-Woolley, WA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sedro-Woolley experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 38°F in January while summers reach 64°F in July. The area gets 233 sunny days per year, above the national average. Annual precipitation totals 49.9 inches (wetter than the 38-inch national average). The area receives 10.8 inches of snow annually. Air quality is rated Good with a median AQI of 28 / among the cleanest air in the country. The city sits at an elevation of 59 feet.
Temperature
38°F Jan (3°C)
64°F Jul (18°C)
| Annual Average | 50.3°F |
| 7% below US avg | |
| January Average | 38°F (3°C) |
| July Average | 64°F (18°C) |
| Sunny Days | 233 days/yr |
Geography
| Elevation | 59 ft (18 m) |
| Area | 1.7 sq mi (4.3 km²) |
| Population Density | 2,904/sq mi |
| Coordinates | 48.5114°N, 122.2321°W |
| Timezone | America/Los_Angeles |
| County | Island County County |
| Nearest Airport | Skagit Regional (MVW) 9 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 28.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 78.0 / 100 |
| Social Vulnerability | 36.8 / 100 |
| Community Resilience | 80.4 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Relatively High |
| Coastal Flood | Relatively Moderate |
| Tsunami | Very Low |
| Volcano | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
615 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.4.
| May 3, 1996 | 8 km NNE of Lake Marcel-Stillwater, Washington | M5.4 | 88 km | 4 km |
| Apr 14, 1990 | 4 km ENE of Deming, Washington | M5.0 | 38 km | 12 km |
| Jan 29, 1995 | 3 km WSW of Des Moines, Washington | M5.0 | 125 km | 15 km |
| Jun 23, 1997 | 2 km NE of Enetai, Washington | M4.9 | 105 km | 13 km |
| Apr 25, 2003 | 26 km W of Brinnon, Washington | M4.8 | 120 km | 51 km |
| Jan 30, 2009 | 6 km ESE of Lofall, Washington | M4.7 | 85 km | 62 km |
| Jul 12, 2019 | 2 km S of Roosevelt, Washington | M4.6 | 73 km | 29 km |
| Mar 3, 2025 | 2025 Orcas Island, Washington | M4.5 | 44 km | 16 km |
| Jun 24, 1997 | 19 km SSW of Gibsons, Canada | M4.4 | 130 km | 3 km |
| Jun 18, 1994 | 11 km SE of Skykomish, Washington | M4.3 | 122 km | -1 km |
| Feb 19, 1991 | 31 km E of Squamish, Canada | M4.3 | 137 km | 5 km |
| Apr 2, 1990 | 2 km ENE of Deming, Washington | M4.3 | 36 km | 0 km |
| Jun 27, 2013 | 25 km N of Leavenworth, Washington | M4.3 | 138 km | 8 km |
| Sep 21, 2002 | 9 km SW of Friday Harbor, Washington | M4.1 | 66 km | 23 km |
| Feb 23, 2017 | 11 km NE of Hoodsport, Washington | M4.1 | 129 km | 15 km |
| Jun 15, 1994 | 1 km WNW of Hoodsport, Washington | M4.0 | 141 km | 44 km |
| Apr 14, 1990 | 2 km ESE of Deming, Washington | M4.0 | 35 km | 3 km |
| Apr 3, 1990 | 3 km ENE of Deming, Washington | M4.0 | 36 km | 1 km |
| Sep 26, 2024 | 12 km E of Saanichton, Canada | M4.0 | 75 km | 52 km |
| Dec 27, 2012 | 12 km E of North Saanich, Canada | M4.0 | 77 km | 54 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
8 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.
| Date | Rating | Distance | Path | Fatalities |
| May 13, 1986 | EF2 | 35 km | 0.3 mi | 0 |
| Nov 24, 1970 | EF2 | 46 km | 0.3 mi | 0 |
| May 18, 2005 | EF1 | 35 km | 0.2 mi | 0 |
| Oct 26, 1971 | EF1 | 65 km | 3.0 mi | 0 |
| Jun 16, 2006 | EF0 | 80 km | 0.5 mi | 0 |
| Jun 5, 2004 | EF0 | 31 km | 0.1 mi | 0 |
| Apr 27, 2004 | EF0 | 54 km | 2.7 mi | 0 |
| Aug 24, 1997 | EF0 | 67 km | 0.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
5 tsunamis recorded within 500 km. Highest wave on record: 38.0 m (125 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2007 | CHEHALIS LAKE, CHILLIWACK | Meteorological | 38.0 m | — | 108 km |
| 1894 | PUYALLUP RIVER DELTA, TACOMA, WA | Meteorological | 3.0 m | 2 | 137 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | — | 110 km |
| 1949 | PUGET SOUND, WA | Meteorological | 2.4 m | — | 137 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 51 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
6 volcanoes within 200 km. Closest: Baker (43 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 43 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 94 km |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 159 km |
| Garibaldi Lake | Volcanic field | 2,316 m (7,598 ft) | Unknown | 168 km |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 188 km |
| Cayley Volcanic Field | Volcanic field | 2,375 m (7,792 ft) | Unknown | 194 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
16 wildfires (100+ acres) recorded within 100 km. Largest: SOURDOUGH (7,517 acres, 2023).
| Year | Name | Acres Burned | Distance |
| 2023 | SOURDOUGH | 7,517 | 83 km |
| 2015 | GOODELL | 6,624 | 76 km |
| 2022 | SUIATTLE RIVER | 4,400 | 68 km |
| 2022 | COPPER LAKE | 3,825 | 77 km |
| 2022 | BRUSH CREEK 2 | 3,186 | 75 km |
| 2003 | MINERAL PARK | 3,010 | 83 km |
| 2022 | SILESIA | 2,737 | 71 km |
| 2022 | MCALLISTER CREEK | 2,581 | 85 km |
| 2022 | BOULDER LAKE | 2,347 | 66 km |
| 2020 | DOWNEY CREEK | 2,324 | 82 km |
| 2022 | LITTLE CHILL | 2,242 | 77 km |
| 2023 | DOME PEAK | 1,873 | 94 km |
| 2003 | BIGBEAVER | 1,807 | 87 km |
| 2001 | REX CREEK COMPLEX (GLORY MOUNTAIN) | 1,331 | 94 km |
| 1990 | WHITE RIVER | 1,319 | 100 km |
| 1998 | UNNAMED | 1,174 | 58 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 38°F (3°C) | 6.6 in | |
| February | 40°F (5°C) | 4.8 in | |
| March | 43°F (6°C) | 4.8 in | |
| April | 47°F (8°C) | 4.1 in | |
| May | 53°F (12°C) | 3.3 in | |
| June | 57°F (14°C) | 2.8 in | |
| July | 64°F (18°C) | 1.8 in | Warmest |
| August | 62°F (17°C) | 1.8 in | Driest |
| September | 58°F (14°C) | 2.8 in | |
| October | 50°F (10°C) | 4.7 in | |
| November | 42°F (6°C) | 7.6 in | Wettest |
| December | 38°F (3°C) | 6.9 in | Coldest |
Sedro-Woolley has a seasonal temperature swing of 26°F / from 38°F in December to 64°F in July. Total annual precipitation is 51.9 inches, with November being the wettest month (7.6") and August the driest (1.8").