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Weather & Climate in Mattawa, WA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mattawa enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 35°F in January while summers reach 79°F in July. The area gets 279 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 7.5 inches (drier 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 756 feet.
Temperature
35°F Jan (2°C)
79°F Jul (26°C)
| Annual Average | 56.0°F |
| 4% above US avg | |
| January Average | 35°F (2°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 279 days/yr |
Geography
| Elevation | 756 ft (230 m) |
| Area | 0.7 sq mi (1.9 km²) |
| Population Density | 3,553/sq mi |
| Coordinates | 46.7364°N, 119.9053°W |
| Timezone | America/Los_Angeles |
| County | Benton County County |
| Nearest Airport | Grant County International (MWH) 43 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 28.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 87.1 / 100 |
| Social Vulnerability | 30.3 / 100 |
| Community Resilience | 58.6 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Moderate |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
302 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.3.
| Jun 18, 1994 | 11 km SE of Skykomish, Washington | M4.3 | 143 km | -1 km |
| Nov 28, 1991 | 7 km S of Walla Walla East, Washington | M4.3 | 148 km | 9 km |
| Jun 27, 2013 | 25 km N of Leavenworth, Washington | M4.3 | 135 km | 8 km |
| Jun 17, 2010 | 30 km S of White Swan, Washington | M4.2 | 95 km | 3 km |
| Feb 18, 2015 | 15 km ENE of Cle Elum, Washington | M4.2 | 86 km | 4 km |
| Jul 14, 1992 | 6 km S of Walla Walla East, Washington | M4.1 | 148 km | 11 km |
| Aug 16, 2004 | 16 km ENE of Packwood, Washington | M4.0 | 120 km | -1 km |
| Oct 9, 1998 | 20 km S of White Swan, Washington | M4.0 | 85 km | 2 km |
| Aug 7, 1992 | 8 km WSW of Irrigon, Oregon | M3.9 | 100 km | 0 km |
| Apr 15, 1991 | 4 km SE of Pateros, Washington | M3.9 | 144 km | 11 km |
| Nov 18, 1997 | 20 km NW of Bickleton, Washington | M3.9 | 79 km | 15 km |
| Mar 29, 2010 | 10 km NE of Cliffdell, Washington | M3.8 | 85 km | 1 km |
| Jan 1, 1997 | 14 km NNE of Selah, Washington | M3.7 | 42 km | 18 km |
| Jul 4, 1997 | 8 km NNE of Waterville, Washington | M3.7 | 109 km | 7 km |
| May 18, 2008 | 11 km SSW of Benton City, Washington | M3.7 | 69 km | 20 km |
| Sep 4, 2011 | 14 km N of Richland, Washington | M3.7 | 61 km | 2 km |
| Apr 6, 2025 | 12 km E of Greenwater, Washington | M3.7 | 129 km | 9 km |
| Dec 24, 2000 | 8 km NNW of Entiat, Washington | M3.5 | 115 km | 7 km |
| Jun 29, 2005 | 0 km SE of Gleed, Washington | M3.5 | 55 km | 9 km |
| Oct 26, 1992 | 12 km N of Naches, Washington | M3.5 | 63 km | -1 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 |
| Apr 30, 1957 | EF2 | 48 km | 1.0 mi | 0 |
| Aug 10, 1985 | EF1 | 72 km | 1.0 mi | 0 |
| Apr 23, 1983 | EF1 | 73 km | 3.0 mi | 0 |
| Jul 1, 1978 | EF1 | 83 km | 2.3 mi | 0 |
| May 1, 2024 | EF0 | 39 km | 0.4 mi | 0 |
| May 26, 2023 | EF0 | 59 km | 0.4 mi | 0 |
| Mar 31, 2020 | EF0 | 66 km | 0.1 mi | 0 |
| May 22, 2016 | EF0 | 82 km | 0.2 mi | 0 |
| Aug 13, 2014 | EF0 | 47 km | 0.3 mi | 0 |
| May 19, 2010 | EF0 | 76 km | 0.2 mi | 0 |
| Apr 7, 2008 | EF0 | 56 km | 0.1 mi | 0 |
| May 9, 2005 | EF0 | 46 km | 0.2 mi | 0 |
| Apr 23, 2005 | EF0 | 53 km | 0.1 mi | 0 |
| Apr 23, 2005 | EF0 | 59 km | 0.1 mi | 0 |
| Jun 7, 2004 | EF0 | 79 km | 0.5 mi | 0 |
| May 19, 2004 | EF0 | 82 km | 0.3 mi | 0 |
| May 11, 2003 | EF0 | 74 km | 0.1 mi | 0 |
| May 15, 2000 | EF0 | 41 km | 0.2 mi | 0 |
| May 9, 1999 | EF0 | 55 km | — | 0 |
| Aug 26, 1997 | EF0 | 74 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Nearby Volcanoes
6 volcanoes within 200 km. Closest: Adams (135 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Adams | Stratovolcano | 3,742 m (12,277 ft) | 950 | 135 km |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 142 km |
| Indian Heaven | Shield(s) | 1,806 m (5,925 ft) | -6250 | 172 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 178 km |
| St. Helens | Stratovolcano | 2,549 m (8,363 ft) | 2008 | 184 km |
| West Crater | Volcanic field | 1,329 m (4,360 ft) | -5750 | 192 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: RANGE 12 (167,604 acres, 2016).
| Year | Name | Acres Burned | Distance |
| 2016 | RANGE 12 | 167,604 | 27 km |
| 2000 | 24 COMMAND | 162,300 | 41 km |
| 1984 | HANFORD | 122,914 | 43 km |
| 2021 | SCHNEIDER SPRINGS | 114,743 | 92 km |
| 2000 | MULE DRY | 90,184 | 87 km |
| 2013 | COLOCKUM TARPS | 79,279 | 52 km |
| 2007 | WAUTOMA | 77,956 | 33 km |
| 2020 | EVANS CANYON | 76,288 | 57 km |
| 1996 | COLD CREEK | 72,859 | 13 km |
| 2018 | BOYLSTON | 66,292 | 20 km |
| 2012 | TABLE MOUNTAIN COMPLEX | 65,887 | 78 km |
| 2024 | BIG HORN | 51,023 | 98 km |
| 2009 | DRY CREEK COMPLEX | 49,843 | 30 km |
| 2024 | RETREAT | 44,681 | 79 km |
| 2019 | COLD CREEK | 43,756 | 35 km |
| 2003 | UMTANUM RIDGE | 34,351 | 13 km |
| 2017 | SILVER DOLLAR | 30,789 | 21 km |
| 2017 | SUTHERLAND CANYON | 29,492 | 64 km |
| 2022 | VANTAGE HIGHWAY | 29,299 | 34 km |
| 2007 | HORSE HEAVEN COMPLEX (SIX PRONG) | 28,225 | 98 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 35°F (2°C) | 0.9 in | |
| February | 37°F (3°C) | 0.7 in | |
| March | 45°F (7°C) | 0.6 in | |
| April | 52°F (11°C) | 0.5 in | |
| May | 60°F (16°C) | 0.5 in | |
| June | 67°F (20°C) | 0.4 in | |
| July | 79°F (26°C) | 0.2 in | Warmest, Driest |
| August | 73°F (23°C) | 0.4 in | |
| September | 64°F (18°C) | 0.4 in | |
| October | 52°F (11°C) | 0.4 in | |
| November | 41°F (5°C) | 1.0 in | |
| December | 32°F (0°C) | 1.2 in | Coldest, Wettest |
Mattawa has a seasonal temperature swing of 47°F / from 32°F in December to 79°F in July. Total annual precipitation is 7.1 inches, with December being the wettest month (1.2") and July the driest (0.2").