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Weather & Climate in Montesano, WA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Montesano experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 39°F in January while summers reach 62°F in July. The area gets 226 sunny days per year, above the national average. Annual precipitation totals 133.9 inches (wetter than the 38-inch national average). 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 431 feet.
Temperature
39°F Jan (4°C)
62°F Jul (17°C)
| Annual Average | 49.6°F |
| 8% below US avg | |
| January Average | 39°F (4°C) |
| July Average | 62°F (17°C) |
| Sunny Days | 226 days/yr |
Geography
| Elevation | 431 ft (131 m) |
| Area | 4.1 sq mi (10.5 km²) |
| Population Density | 381/sq mi |
| Coordinates | 47.0147°N, 123.5857°W |
| Timezone | America/Los_Angeles |
| County | Grays Harbor County County |
| Nearest Airport | Olympia Regional (OLM) 32 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 28.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.0 / 100 |
| Social Vulnerability | 67.2 / 100 |
| Community Resilience | 62.0 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively High |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Relatively Moderate |
| Coastal Flood | Very High |
| Tsunami | Very High |
| Volcano | No Rating |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
1,214 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.8.
| Feb 28, 2001 | 7 km SSE of Longbranch, Washington | M6.8 | 67 km | 52 km |
| Jul 3, 1999 | 8 km N of Satsop, Washington | M5.8 | 11 km | 40 km |
| Jun 10, 2001 | 18 km N of Satsop, Washington | M5.0 | 18 km | 40 km |
| Jan 29, 1995 | 3 km WSW of Des Moines, Washington | M5.0 | 101 km | 15 km |
| Jun 23, 1997 | 2 km NE of Enetai, Washington | M4.9 | 100 km | 13 km |
| Apr 25, 2003 | 26 km W of Brinnon, Washington | M4.8 | 77 km | 51 km |
| Jan 30, 2009 | 6 km ESE of Lofall, Washington | M4.7 | 114 km | 62 km |
| Jul 22, 2001 | 4 km WSW of DuPont, Washington | M4.3 | 69 km | 52 km |
| Feb 14, 2011 | 31 km S of Morton, Washington | M4.3 | 133 km | 4 km |
| May 20, 1995 | 15 km NNE of Ashford, Washington | M4.1 | 126 km | 12 km |
| Feb 23, 2017 | 11 km NE of Hoodsport, Washington | M4.1 | 66 km | 15 km |
| Jun 15, 1994 | 1 km WNW of Hoodsport, Washington | M4.0 | 54 km | 44 km |
| Jul 1, 2009 | 4 km SE of Coupeville, Washington | M4.0 | 149 km | 58 km |
| Jun 25, 2004 | 17 km W of Packwood, Washington | M3.9 | 136 km | -1 km |
| Oct 1, 2004 | 37 km NNE of Amboy, Washington | M3.9 | 140 km | -1 km |
| Jun 27, 1997 | 3 km SW of Bainbridge Island, Washington | M3.9 | 102 km | 1 km |
| Sep 10, 1994 | 2 km SE of Enumclaw, Washington | M3.9 | 124 km | 17 km |
| Mar 6, 2025 | 14 km SW of Blyn, Washington | M3.9 | 107 km | 42 km |
| Jan 3, 2018 | 37 km SSE of Morton, Washington | M3.9 | 144 km | 10 km |
| Sep 12, 2015 | 3 km NE of North Bend, Washington | M3.9 | 149 km | 19 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
23 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.
| Date | Rating | Distance | Path | Fatalities |
| Dec 18, 2018 | EF2 | 90 km | 1.4 mi | 0 |
| Nov 10, 1965 | EF2 | 63 km | 1.5 mi | 0 |
| Oct 10, 2020 | EF1 | 48 km | 0.5 mi | 0 |
| Oct 18, 2019 | EF1 | 56 km | 0.7 mi | 0 |
| Jan 18, 2015 | EF1 | 83 km | 4.1 mi | 0 |
| Sep 30, 2013 | EF1 | 93 km | 1.0 mi | 0 |
| May 27, 2004 | EF1 | 54 km | 0.2 mi | 0 |
| May 31, 1997 | EF1 | 89 km | 0.5 mi | 0 |
| Jun 12, 1978 | EF1 | 93 km | 1.5 mi | 0 |
| Mar 19, 2021 | EF0 | 84 km | 0.3 mi | 0 |
| May 27, 2011 | EF0 | 72 km | 0.1 mi | 0 |
| Oct 25, 2010 | EF0 | 88 km | 0.0 mi | 0 |
| Jan 28, 2006 | EF0 | 65 km | 0.5 mi | 0 |
| Oct 15, 2003 | EF0 | 75 km | 0.1 mi | 0 |
| Dec 23, 1997 | EF0 | 43 km | 0.3 mi | 0 |
| Aug 26, 1997 | EF0 | 8 km | 0.5 mi | 0 |
| Jun 23, 1996 | EF0 | 88 km | 0.4 mi | 0 |
| Apr 6, 1994 | EF0 | 53 km | 0.5 mi | 0 |
| Feb 13, 1994 | EF0 | 97 km | 0.1 mi | 0 |
| Jun 13, 1991 | EF0 | 89 km | 0.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
6 tsunamis recorded within 500 km. Highest wave on record: 250.0 m (820 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1980 | WASHINGTON | Explosion | 250.0 m | 61 | 141 km |
| 1894 | PUYALLUP RIVER DELTA, TACOMA, WA | Meteorological | 3.0 m | 2 | 91 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | — | 110 km |
| 1949 | PUGET SOUND, WA | Meteorological | 2.4 m | — | 86 km |
| 1949 | PUGET SOUND, WA | Eruption + Earthquake | — | 8 | 75 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 148 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Rainier (140 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 140 km |
| St. Helens | Stratovolcano | 2,549 m (8,363 ft) | 2008 | 141 km |
| West Crater | Volcanic field | 1,329 m (4,360 ft) | -5750 | 171 km |
| Indian Heaven | Shield(s) | 1,806 m (5,925 ft) | -6250 | 181 km |
| Adams | Stratovolcano | 3,742 m (12,277 ft) | 950 | 184 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
7 wildfires (100+ acres) recorded within 100 km. Largest: DELABARRE (4,176 acres, 2023).
| Year | Name | Acres Burned | Distance |
| 2023 | DELABARRE | 4,176 | 85 km |
| 2018 | MAPLE | 3,547 | 71 km |
| 2015 | PARADISE | 2,818 | 78 km |
| 2016 | HAYES TWO | 2,679 | 89 km |
| 2011 | BIG HUMP | 1,400 | 84 km |
| 1985 | BEAVER | 1,107 | 61 km |
| 2006 | BEAR GULCH II | 1,037 | 59 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 39°F (4°C) | 13.2 in | Coldest |
| February | 42°F (6°C) | 10.4 in | |
| March | 44°F (7°C) | 9.5 in | |
| April | 48°F (9°C) | 6.1 in | |
| May | 53°F (12°C) | 3.8 in | |
| June | 57°F (14°C) | 2.6 in | |
| July | 62°F (17°C) | 1.6 in | Warmest, Driest |
| August | 62°F (16°C) | 1.9 in | |
| September | 58°F (15°C) | 3.7 in | |
| October | 51°F (11°C) | 7.6 in | |
| November | 44°F (7°C) | 12.5 in | |
| December | 40°F (4°C) | 13.9 in | Wettest |
Montesano has a seasonal temperature swing of 23°F / from 39°F in January to 62°F in July. Total annual precipitation is 86.9 inches, with December being the wettest month (13.9") and July the driest (1.6").