Weather & Climate in Copalis Beach, WA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Copalis Beach experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 43°F in January while summers reach 60°F in July / relatively mild seasonal variation. Annual precipitation totals 68.8 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 20 / among the cleanest air in the country. 96% of days have good air quality. The city sits at an elevation of 12 feet.
Temperature
43°F Jan (6°C)
60°F Jul (16°C)
| Annual Average | 51.0°F |
| 6% below US avg | |
| January Average | 43°F (6°C) |
| July Average | 60°F (16°C) |
Geography
| Elevation | 12 ft (4 m) |
| Area | 1.5 sq mi (3.8 km²) |
| Population Density | 121/sq mi |
| Coordinates | 47.1246°N, 124.1665°W |
| Timezone | America/Los_Angeles |
| County | Grays Harbor County County |
| Nearest Airport | Olympia Regional (OLM) 60 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 20.0 |
| Rating | Good |
| Good Days % | 96.4% |
| Unhealthy Days | 0 |
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
278 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 | 109 km | 52 km |
| Jul 3, 1999 | 8 km N of Satsop, Washington | M5.8 | 54 km | 40 km |
| Jan 29, 1995 | 3 km WSW of Des Moines, Washington | M5.0 | 139 km | 15 km |
| Jun 10, 2001 | 18 km N of Satsop, Washington | M5.0 | 50 km | 40 km |
| Jun 23, 1997 | 2 km NE of Enetai, Washington | M4.9 | 131 km | 13 km |
| Apr 25, 2003 | 26 km W of Brinnon, Washington | M4.8 | 92 km | 51 km |
| Jan 30, 2009 | 6 km ESE of Lofall, Washington | M4.7 | 140 km | 62 km |
| Jul 22, 2001 | 4 km WSW of DuPont, Washington | M4.3 | 112 km | 52 km |
| Feb 23, 2017 | 11 km NE of Hoodsport, Washington | M4.1 | 94 km | 15 km |
| Jun 15, 1994 | 1 km WNW of Hoodsport, Washington | M4.0 | 82 km | 44 km |
| Jun 27, 1997 | 3 km SW of Bainbridge Island, Washington | M3.9 | 133 km | 1 km |
| Mar 6, 2025 | 14 km SW of Blyn, Washington | M3.9 | 118 km | 42 km |
| Jul 24, 2011 | 21 km W of Brinnon, Washington | M3.9 | 99 km | 41 km |
| Jun 12, 2021 | 3 km WSW of Skokomish, Washington | M3.8 | 76 km | 44 km |
| Sep 8, 2022 | 7 km WNW of Lofall, Washington | M3.7 | 133 km | 23 km |
| Nov 26, 1997 | 15 km WSW of Quilcene, Washington | M3.7 | 111 km | 46 km |
| May 30, 2003 | 4 km SSW of Gorst, Washington | M3.7 | 116 km | 25 km |
| Jun 16, 2002 | 2 km N of Belfair, Washington | M3.7 | 108 km | 16 km |
| Aug 19, 2025 | 17 km NNW of Sekiu, Washington | M3.7 | 144 km | 38 km |
| Jun 16, 2017 | 2 km NNW of Quilcene, Washington | M3.7 | 125 km | 55 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
9 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF1.
| Date | Rating | Distance | Path | Fatalities |
| Oct 10, 2020 | EF1 | 32 km | 0.5 mi | 0 |
| Oct 18, 2019 | EF1 | 94 km | 0.7 mi | 0 |
| May 27, 2004 | EF1 | 99 km | 0.2 mi | 0 |
| Mar 19, 2021 | EF0 | 91 km | 0.3 mi | 0 |
| Dec 23, 1997 | EF0 | 33 km | 0.3 mi | 0 |
| Aug 26, 1997 | EF0 | 54 km | 0.5 mi | 0 |
| Apr 6, 1994 | EF0 | 98 km | 0.5 mi | 0 |
| Jun 13, 1991 | EF0 | 99 km | 0.3 mi | 0 |
| Dec 1, 1990 | EF0 | 59 km | 0.2 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Tsunami History
4 tsunamis recorded within 500 km. Highest wave on record: 3.0 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1894 | PUYALLUP RIVER DELTA, TACOMA, WA | Meteorological | 3.0 m | 2 | 131 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | - | 109 km |
| 1949 | PUGET SOUND, WA | Meteorological | 2.4 m | - | 125 km |
| 1949 | PUGET SOUND, WA | Eruption + Earthquake | - | 8 | 117 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
2 volcanoes within 200 km. Closest: St. Helens (183 km).
| Name | Type | Elevation | Last Eruption | Distance |
| St. Helens | Stratovolcano | 2,549 m (8,363 ft) | 2008 | 183 km |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 185 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
6 wildfires (100+ acres) recorded within 100 km. Largest: DELABARRE (4,176 acres, 2023).
| Year | Name | Acres Burned | Distance |
| 2023 | DELABARRE | 4,176 | 90 km |
| 2018 | MAPLE | 3,547 | 92 km |
| 2015 | PARADISE | 2,818 | 70 km |
| 2016 | HAYES TWO | 2,679 | 96 km |
| 1985 | BEAVER | 1,107 | 77 km |
| 2006 | BEAR GULCH II | 1,037 | 78 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 43°F (6°C) | 10.9 in | |
| February | 44°F (6°C) | 6.7 in | |
| March | 46°F (8°C) | 7.7 in | |
| April | 49°F (9°C) | 5.4 in | |
| May | 53°F (12°C) | 3.0 in | |
| June | 57°F (14°C) | 2.0 in | |
| July | 60°F (16°C) | 0.9 in | Driest |
| August | 61°F (16°C) | 1.4 in | Warmest |
| September | 59°F (15°C) | 2.5 in | |
| October | 53°F (11°C) | 6.9 in | |
| November | 46°F (8°C) | 11.0 in | Wettest |
| December | 42°F (6°C) | 10.5 in | Coldest |
Copalis Beach has a seasonal temperature swing of 19°F / from 42°F in December to 61°F in August. Total annual precipitation is 68.8 inches, with November being the wettest month (11.0") and July the driest (0.9").