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Weather & Climate in Hermiston, OR
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hermiston experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 36°F in January while summers reach 76°F in July. The area gets 293 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 8.6 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 32. The city sits at an elevation of 483 feet.
Temperature
36°F Jan (2°C)
76°F Jul (24°C)
| Annual Average | 53.9°F |
| 0% below US avg | |
| January Average | 36°F (2°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 483 ft (147 m) |
| Area | 7.8 sq mi (20.2 km²) |
| Population Density | 2,294/sq mi |
| Coordinates | 45.8329°N, 119.2852°W |
| Timezone | America/Los_Angeles |
| County | Morrow County County |
| Nearest Airport | Eastern Oregon Regional At Pendleton (PDT) 25 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 32.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 26.4 / 100 |
| Social Vulnerability | 26.6 / 100 |
| Community Resilience | 2.8 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively Moderate |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
191 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.3.
| Nov 28, 1991 | 7 km S of Walla Walla East, Washington | M4.3 | 77 km | 9 km |
| Jun 17, 2010 | 30 km S of White Swan, Washington | M4.2 | 117 km | 3 km |
| Jan 30, 2000 | 6 km SE of Condon, Oregon | M4.1 | 96 km | -1 km |
| Jul 14, 1992 | 6 km S of Walla Walla East, Washington | M4.1 | 78 km | 11 km |
| Oct 9, 1998 | 20 km S of White Swan, Washington | M4.0 | 117 km | 2 km |
| Aug 7, 1992 | 8 km WSW of Irrigon, Oregon | M3.9 | 24 km | 0 km |
| Nov 18, 1997 | 20 km NW of Bickleton, Washington | M3.9 | 98 km | 15 km |
| Mar 22, 1997 | 10 km ESE of Condon, Oregon | M3.9 | 93 km | 0 km |
| Jan 1, 1997 | 14 km NNE of Selah, Washington | M3.7 | 138 km | 18 km |
| May 18, 2008 | 11 km SSW of Benton City, Washington | M3.7 | 43 km | 20 km |
| Sep 4, 2011 | 14 km N of Richland, Washington | M3.7 | 64 km | 2 km |
| Feb 1, 2000 | 7 km SE of Condon, Oregon | M3.6 | 96 km | -1 km |
| Jan 23, 2015 | 3 km N of Cayuse, Oregon | M3.5 | 59 km | 20 km |
| Jun 29, 2005 | 0 km SE of Gleed, Washington | M3.5 | 137 km | 9 km |
| Aug 31, 1999 | Washington-Oregon border region | M3.5 | 95 km | 3 km |
| Oct 12, 2017 | 25 km NW of Bickleton, Washington | M3.4 | 103 km | 13 km |
| Oct 15, 2011 | 13 km N of Richland, Washington | M3.4 | 64 km | 1 km |
| Jan 30, 2000 | 8 km SE of Condon, Oregon | M3.4 | 96 km | -1 km |
| Nov 6, 1997 | 22 km SE of Desert Aire, Washington | M3.4 | 84 km | 22 km |
| Jun 17, 2004 | 11 km SSE of Washtucna, Washington | M3.4 | 123 km | 17 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 |
| Jun 26, 1958 | EF2 | 38 km | 0.3 mi | 0 |
| May 6, 2022 | EF1 | 78 km | 2.9 mi | 0 |
| May 6, 2009 | EF1 | 61 km | 1.6 mi | 0 |
| May 19, 2006 | EF1 | 31 km | 0.1 mi | 0 |
| Apr 23, 1983 | EF1 | 81 km | 3.0 mi | 0 |
| Mar 5, 2024 | EF0 | 67 km | 0.2 mi | 0 |
| Jun 27, 2023 | EF0 | 80 km | 0.1 mi | 0 |
| Mar 31, 2020 | EF0 | 55 km | 0.1 mi | 0 |
| May 22, 2016 | EF0 | 42 km | 0.2 mi | 0 |
| Aug 13, 2014 | EF0 | 67 km | 0.3 mi | 0 |
| Apr 14, 2011 | EF0 | 57 km | 0.2 mi | 0 |
| Apr 23, 2005 | EF0 | 98 km | 0.1 mi | 0 |
| Apr 23, 2005 | EF0 | 93 km | 0.1 mi | 0 |
| Jun 7, 2004 | EF0 | 42 km | 0.5 mi | 0 |
| May 23, 2004 | EF0 | 9 km | 0.1 mi | 0 |
| Jul 13, 2002 | EF0 | 38 km | 0.2 mi | 0 |
| Jul 9, 1995 | EF0 | 3 km | 0.1 mi | 0 |
| May 1, 1991 | EF0 | 51 km | 0.1 mi | 0 |
| Aug 24, 1987 | EF0 | 79 km | 0.2 mi | 0 |
| May 22, 1964 | EF0 | 54 km | 10.7 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Nearby Volcanoes
3 volcanoes within 200 km. Closest: Adams (175 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Adams | Stratovolcano | 3,742 m (12,277 ft) | 950 | 175 km |
| Hood | Stratovolcano | 3,426 m (11,240 ft) | 1866 | 194 km |
| Indian Heaven | Shield(s) | 1,806 m (5,925 ft) | -6250 | 197 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: BATTLE MOUNTAIN COMPLEX (184,979 acres, 2024).
| Year | Name | Acres Burned | Distance |
| 2024 | BATTLE MOUNTAIN COMPLEX | 184,979 | 92 km |
| 2016 | RANGE 12 | 167,604 | 86 km |
| 2000 | 24 COMMAND | 162,300 | 71 km |
| 1984 | HANFORD | 122,914 | 70 km |
| 2000 | MULE DRY | 90,184 | 66 km |
| 2007 | WAUTOMA | 77,956 | 79 km |
| 2023 | NEWELL ROAD | 61,833 | 82 km |
| 2007 | MONUMENT COMPLEX (RED HILL FIRE) | 54,572 | 98 km |
| 2024 | BIG HORN | 51,023 | 63 km |
| 2009 | DRY CREEK COMPLEX | 49,843 | 88 km |
| 2008 | COAL PLANT | 45,801 | 37 km |
| 2019 | COLD CREEK | 43,756 | 77 km |
| 2015 | HIGHWAY 8 | 35,296 | 70 km |
| 2016 | 0353 RN SCOTT CANYON | 32,051 | 89 km |
| 2017 | SILVER DOLLAR | 30,789 | 90 km |
| 2007 | HORSE HEAVEN COMPLEX (SIX PRONG) | 28,225 | 66 km |
| 2000 | UNNAMED | 27,815 | 40 km |
| 2015 | UNNAMED | 27,736 | 42 km |
| 2018 | L RD SW | 22,101 | 99 km |
| 1996 | UNNAMED | 21,130 | 41 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 36°F (2°C) | 1.3 in | |
| February | 39°F (4°C) | 1.0 in | |
| March | 46°F (8°C) | 1.0 in | |
| April | 52°F (11°C) | 0.9 in | |
| May | 60°F (15°C) | 0.9 in | |
| June | 67°F (19°C) | 0.6 in | |
| July | 76°F (24°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) | 0.8 in | |
| November | 42°F (6°C) | 1.3 in | Wettest |
| December | 34°F (1°C) | 1.2 in | Coldest |
Hermiston has a seasonal temperature swing of 41°F / from 34°F in December to 76°F in July. Total annual precipitation is 9.9 inches, with November being the wettest month (1.3") and July the driest (0.2").