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Weather & Climate in Port Sanilac, MI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Port Sanilac experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 23°F in January while summers reach 69°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 35.4 inches. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 622 feet.
Temperature
23°F Jan (-5°C)
69°F Jul (21°C)
| Annual Average | 46.5°F |
| 14% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 622 ft (190 m) |
| Area | 0.8 sq mi (2.1 km²) |
| Population Density | 926/sq mi |
| Coordinates | 43.4277°N, 82.5447°W |
| Timezone | America/Detroit |
| County | Sanilac County County |
| Nearest Airport | St Clair County International (PHN) 36 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 70.3 / 100 |
| Social Vulnerability | 72.0 / 100 |
| Community Resilience | 68.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
4 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.0.
| Feb 23, 2011 | 18 km NE of Leamington, Canada | M3.0 | 142 km | 5 km |
| May 14, 2017 | 18 km ENE of Leamington, Canada | M2.6 | 144 km | 5 km |
| Mar 8, 2010 | 7 km ENE of Grosse Ile, Michigan | M2.5 | 147 km | 18 km |
| May 23, 2022 | 2 km NNW of Corunna, Canada | M2.5 | 59 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
129 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 16 fatalities, 344 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 8, 1964 | EF4 | 87 km | 3.3 mi | 11 |
| Jun 8, 1953 | EF4 | 60 km | 33.8 mi | 0 |
| May 21, 1953 | EF4 | 57 km | 10.0 mi | 2 |
| Jul 2, 1997 | EF3 | 99 km | 2.0 mi | 0 |
| Jul 2, 1997 | EF3 | 91 km | 1.7 mi | 1 |
| Jun 21, 1996 | EF3 | 98 km | 1.0 mi | 0 |
| Sep 2, 1984 | EF3 | 32 km | 15.6 mi | 0 |
| Mar 20, 1976 | EF3 | 88 km | 17.1 mi | 1 |
| Jul 14, 1974 | EF3 | 92 km | 1.0 mi | 0 |
| Jun 26, 2021 | EF2 | 76 km | 6.8 mi | 0 |
| Jun 22, 2015 | EF2 | 99 km | 11.3 mi | 0 |
| Mar 15, 2012 | EF2 | 79 km | 4.6 mi | 0 |
| Jun 21, 1996 | EF2 | 38 km | 0.2 mi | 0 |
| Aug 7, 1984 | EF2 | 84 km | 0.4 mi | 0 |
| May 19, 1983 | EF2 | 72 km | 1.8 mi | 0 |
| Jun 15, 1982 | EF2 | 58 km | 6.0 mi | 0 |
| May 21, 1975 | EF2 | 53 km | 0.1 mi | 0 |
| Sep 17, 1974 | EF2 | 99 km | 0.8 mi | 0 |
| Jul 4, 1974 | EF2 | 63 km | 5.7 mi | 0 |
| Jun 15, 1974 | EF2 | 93 km | 2.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 1.5 m (5 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1952 | LAKE HURON, MI | Avalanche | 1.5 m | - | 38 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 2.0 in | Coldest |
| February | 23°F (-5°C) | 1.7 in | Driest |
| March | 32°F (-0°C) | 2.2 in | |
| April | 43°F (6°C) | 2.6 in | |
| May | 54°F (12°C) | 2.7 in | |
| June | 64°F (18°C) | 3.1 in | |
| July | 69°F (21°C) | 2.7 in | Warmest |
| August | 68°F (20°C) | 3.2 in | |
| September | 62°F (16°C) | 3.7 in | Wettest |
| October | 50°F (10°C) | 2.8 in | |
| November | 39°F (4°C) | 2.9 in | |
| December | 28°F (-2°C) | 2.6 in |
Port Sanilac has a seasonal temperature swing of 46°F / from 23°F in January to 69°F in July. Total annual precipitation is 32.0 inches, with September being the wettest month (3.7") and February the driest (1.7").