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Weather & Climate in Grand Marais, MI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Grand Marais has a cool climate with an average annual temperature of 43°F (6°C). Winters average 19°F in January while summers reach 65°F in July. The area gets 253 sunny days per year, above the national average. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 601 feet.
Temperature
19°F Jan (-7°C)
65°F Jul (18°C)
| Annual Average | 42.6°F |
| 21% below US avg | |
| January Average | 19°F (-7°C) |
| July Average | 65°F (18°C) |
| Sunny Days | 253 days/yr |
Geography
| Elevation | 601 ft (183 m) |
| Area | 3.2 sq mi (8.4 km²) |
| Population Density | 135/sq mi |
| Coordinates | 46.6757°N, 85.9664°W |
| Timezone | America/Detroit |
| County | Luce County County |
| Nearest Airport | Marquette/Sawyer Regional (MQT) 73 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 2.6 / 100 |
| Social Vulnerability | 79.8 / 100 |
| Community Resilience | 52.2 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | No Rating |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tornado History
17 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 2 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jul 14, 1984 | EF2 | 64 km | 27.0 mi | 0 |
| May 6, 1964 | EF2 | 87 km | 0.1 mi | 0 |
| Oct 5, 1997 | EF1 | 98 km | 0.1 mi | 0 |
| Aug 16, 1988 | EF1 | 77 km | 0.6 mi | 0 |
| Jul 9, 1987 | EF1 | 55 km | 2.7 mi | 0 |
| Aug 16, 1978 | EF1 | 69 km | 0.5 mi | 0 |
| Aug 22, 1977 | EF1 | 52 km | 1.5 mi | 0 |
| Jul 8, 2016 | EF0 | 58 km | 0.3 mi | 0 |
| May 23, 2011 | EF0 | 50 km | 2.4 mi | 0 |
| Jul 28, 2005 | EF0 | 59 km | 0.1 mi | 0 |
| Aug 14, 1996 | EF0 | 90 km | 0.1 mi | 0 |
| Jul 19, 1992 | EF0 | 48 km | 0.1 mi | 0 |
| Jul 11, 1987 | EF0 | 77 km | 2.0 mi | 0 |
| May 1, 1983 | EF0 | 53 km | 0.1 mi | 0 |
| Jul 11, 1975 | EF0 | 74 km | 0.1 mi | 0 |
| Jun 29, 1958 | EF0 | 68 km | 0.5 mi | 0 |
| Jul 6, 1953 | EF0 | 58 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
17 wildfires (100+ acres) recorded within 100 km. Largest: DUCK LAKE (21,484 acres, 2012).
| Year | Name | Acres Burned | Distance |
| 2012 | DUCK LAKE | 21,484 | 43 km |
| 2007 | SLEEPER LAKE | 17,623 | 39 km |
| 1987 | EIGHT MILE | 3,475 | 70 km |
| 2009 | SEDGE MEADOW | 2,680 | 51 km |
| 2004 | 2004 MARSH CREEK | 1,977 | 57 km |
| 2011 | 8/4-8/6 M-2 NORTH | 1,918 | 47 km |
| 1995 | OGEMAW10 | 1,212 | 49 km |
| 2007 | EAST SEDGE MARSH BURNING-1 | 1,117 | 43 km |
| 1987 | SCHOOLCRAFT7 | 943 | 27 km |
| 1994 | H POOL | 914 | 46 km |
| 2008 | UNNAMED | 831 | 44 km |
| 1999 | MACKINAC3 | 741 | 85 km |
| 2019 | RIFLE RANGE | 729 | 93 km |
| 2008 | C 3 | 658 | 45 km |
| 2006 | MARSH LANDS 2006 RX | 635 | 44 km |
| 1984 | UNNAMED | 575 | 62 km |
| 2009 | MARSH CREEK SOUTH WEDGE | 510 | 57 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 19°F (-7°C) | 2.4 in | Coldest |
| February | 20°F (-7°C) | 1.5 in | Driest |
| March | 27°F (-3°C) | 1.7 in | |
| April | 37°F (3°C) | 1.7 in | |
| May | 46°F (8°C) | 2.6 in | |
| June | 54°F (12°C) | 3.0 in | |
| July | 65°F (18°C) | 2.7 in | Warmest |
| August | 64°F (18°C) | 3.2 in | |
| September | 57°F (14°C) | 3.8 in | Wettest |
| October | 47°F (8°C) | 3.3 in | |
| November | 36°F (2°C) | 2.8 in | |
| December | 26°F (-3°C) | 2.6 in |
Grand Marais has a seasonal temperature swing of 46°F / from 19°F in January to 65°F in July. Total annual precipitation is 31.1 inches, with September being the wettest month (3.8") and February the driest (1.5").