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Weather & Climate in Lewiston, UT
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Lewiston experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 22°F in January while summers reach 70°F in July. The area gets 316 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 16.9 inches (drier than the 38-inch national average). The area receives 49.0 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 4,508 feet.
Temperature
22°F Jan (-6°C)
70°F Jul (21°C)
| Annual Average | 45.9°F |
| 15% below US avg | |
| January Average | 22°F (-6°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 316 days/yr |
Geography
| Elevation | 4,508 ft (1,374 m) |
| Area | 0.1 sq mi (0.2 km²) |
| Population Density | 86/sq mi |
| Coordinates | 41.9685°N, 111.8858°W |
| Timezone | America/Denver |
| County | Cache County County |
| Nearest Airport | Brigham City Regional (BMC) 30 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 66.5 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 76.5 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
1,322 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.8.
| Feb 3, 1994 | 4 km SSE of Auburn, Wyoming | M5.8 | 116 km | 8 km |
| Mar 18, 2020 | 5 km NNE of Magna, Utah | M5.7 | 136 km | 12 km |
| Apr 21, 2001 | 29 km WSW of Freedom, Idaho | M5.3 | 114 km | 1 km |
| Sep 2, 2017 | 12 km E of Soda Springs, Idaho | M5.3 | 84 km | 10 km |
| Sep 10, 2017 | 9 km NNW of Georgetown, Idaho | M5.0 | 77 km | 10 km |
| Apr 15, 2010 | 9 km NE of Randolph, Utah | M4.9 | 72 km | 10 km |
| Feb 11, 1994 | 3 km SSE of Auburn, Wyoming | M4.8 | 115 km | 5 km |
| Sep 10, 2017 | 12 km ESE of Soda Springs, Idaho | M4.7 | 79 km | 5 km |
| Sep 11, 2017 | 9 km NW of Georgetown, Idaho | M4.7 | 74 km | 8 km |
| Sep 3, 2017 | 15 km ESE of Soda Springs, Idaho | M4.7 | 81 km | 10 km |
| Feb 4, 1994 | 4 km WNW of Fairview, Wyoming | M4.7 | 109 km | 5 km |
| Sep 3, 2017 | 10 km E of Soda Springs, Idaho | M4.7 | 82 km | 8 km |
| Nov 4, 1992 | 67 km ENE of Montello, Nevada | M4.7 | 140 km | 9 km |
| Sep 6, 2017 | 11 km NNW of Georgetown, Idaho | M4.6 | 76 km | 10 km |
| Mar 18, 2020 | 6 km NNE of Magna, Utah | M4.6 | 135 km | 9 km |
| Mar 18, 2020 | 5 km NE of Magna, Utah | M4.6 | 136 km | 11 km |
| Feb 7, 1994 | 4 km SW of Fairview, Wyoming | M4.5 | 105 km | 5 km |
| Sep 4, 2017 | 13 km ESE of Soda Springs, Idaho | M4.5 | 81 km | 6 km |
| Feb 3, 1994 | 13 km WSW of Auburn, Wyoming | M4.4 | 104 km | 5 km |
| Feb 10, 1994 | 3 km WSW of Auburn, Wyoming | M4.4 | 114 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
39 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 16 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 14, 1968 | EF2 | 82 km | 1.5 mi | 0 |
| Sep 22, 2016 | EF1 | 90 km | 2.9 mi | 0 |
| Aug 20, 1998 | EF1 | 90 km | 0.1 mi | 0 |
| May 29, 1996 | EF1 | 75 km | 1.3 mi | 0 |
| Jun 11, 1993 | EF1 | 86 km | 10.0 mi | 0 |
| Sep 23, 1992 | EF1 | 100 km | 2.0 mi | 0 |
| Sep 17, 1989 | EF1 | 6 km | 0.2 mi | 0 |
| May 29, 1987 | EF1 | 3 km | 0.2 mi | 0 |
| May 21, 1986 | EF1 | 52 km | 0.5 mi | 0 |
| May 21, 1986 | EF1 | 40 km | 5.0 mi | 0 |
| Aug 18, 1983 | EF1 | 86 km | 2.5 mi | 0 |
| Jun 30, 1982 | EF1 | 15 km | 1.2 mi | 0 |
| May 6, 1981 | EF1 | 15 km | 0.5 mi | 0 |
| Jun 23, 1965 | EF1 | 80 km | 0.6 mi | 0 |
| May 25, 1954 | EF1 | 50 km | 0.5 mi | 0 |
| Jun 23, 2023 | EF0 | 76 km | 0.2 mi | 0 |
| May 28, 2018 | EF0 | 69 km | 0.1 mi | 0 |
| Jul 31, 2016 | EF0 | 84 km | 1.7 mi | 0 |
| Jul 7, 2013 | EF0 | 55 km | 1.0 mi | 0 |
| May 3, 2009 | EF0 | 64 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 3.6 m (12 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1909 | UTAH | Earthquake | 3.6 m | — | 70 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
2 volcanoes within 200 km. Closest: Wapi Lava Field (149 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Wapi Lava Field | Shield | 1,604 m (5,262 ft) | -300 | 149 km |
| Hell's Half Acre | Shield | 1,631 m (5,351 ft) | -3250 | 176 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: STONE 2 (50,677 acres, 2006).
| Year | Name | Acres Burned | Distance |
| 2006 | STONE 2 | 50,677 | 75 km |
| 2001 | UNNAMED | 38,647 | 72 km |
| 1994 | ELEVATOR | 31,854 | 40 km |
| 2013 | STATE | 31,011 | 38 km |
| 2016 | BROAD MOUTH | 21,009 | 36 km |
| 1996 | GOLDEN SPIKE | 16,186 | 72 km |
| 2007 | CLEVELAND | 16,172 | 39 km |
| 1999 | BRIDGER BA | 15,227 | 86 km |
| 2018 | GORING | 14,538 | 41 km |
| 2018 | NORTH EDEN | 14,398 | 68 km |
| 2007 | RED CANYON RX BURN-H | 13,464 | 97 km |
| 2007 | COW CANYON | 13,447 | 84 km |
| 2017 | WILDCAT | 13,100 | 98 km |
| 1992 | MEADOW DIVIDE | 12,968 | 81 km |
| 2000 | TAYLOR | 12,633 | 58 km |
| 1988 | METCALF | 11,946 | 56 km |
| 2000 | MOONSHINE | 11,489 | 96 km |
| 1994 | DRY CANYON 2 | 10,927 | 61 km |
| 2005 | FORT HALL COMPLEX | 10,720 | 100 km |
| 2007 | MITCHELL | 10,466 | 81 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-6°C) | 1.4 in | Coldest |
| February | 27°F (-3°C) | 1.3 in | |
| March | 38°F (3°C) | 1.6 in | |
| April | 46°F (8°C) | 1.7 in | |
| May | 55°F (13°C) | 2.2 in | Wettest |
| June | 64°F (18°C) | 1.2 in | |
| July | 70°F (21°C) | 0.9 in | Warmest |
| August | 70°F (21°C) | 0.9 in | Driest |
| September | 60°F (15°C) | 1.3 in | |
| October | 48°F (9°C) | 1.7 in | |
| November | 35°F (2°C) | 1.3 in | |
| December | 24°F (-4°C) | 1.3 in |
Lewiston has a seasonal temperature swing of 48°F / from 22°F in January to 70°F in July. Total annual precipitation is 16.8 inches, with May being the wettest month (2.2") and August the driest (0.9").