Water Temperature of Lake Superior in Grand Marais, MN
Current Water Temperature
Measurement Time: Tuesday, October 28, 2025, 6:10 AM CDT
Temperature Locations
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Station Name: Grand Marais
Data Source: USGS
Elevation Above Sea Level: 607 feet / 185 meters
Nearest Address:
2nd Street
Grand Marais, MN 55604
Cook County
GPS Coordinates: 47.7517, -90.3283
Nearby Water Temperatures
Grand Marais Harbor, Grand Marais, MN (0.6 mi)Poplar River, Lutsen, MN (19.4 mi)
Grand Portage River, Grand Portage, MN (33.3 mi)
Lake Superior, Lake Superior, MI (38.1 mi)
Baptism River, Illgen City, MN (49.7 mi)
Washington Creek, Windigo, MI (56.1 mi)
Kawishiwi River, Ely, MN (57.2 mi)
Dunka River, Babbitt, MN (71.4 mi)
Dunka River, Babbitt, MN (71.7 mi)
Partrige River, Babbitt, MN (74.9 mi)
Lake Superior, Two Harbors, MN (80.5 mi)
Chequamegon Bay, Ashland, WI (81.7 mi)
Saint Louis River, Hoyt Lakes, MN (81.9 mi)
Lake Superior, Calumet, MI (86.9 mi)
Presque Isle River, Tula, MI (87.2 mi)
Weather for Grand Marais, Minnesota
Current Weather

Humidity: 64%
Feels Like: 52.7°F
Wind: SE 5.4 mph
Wind Gusts: 6.2 mph
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 1.8
Five Day Weather Forecast

Wed
H: 51°F
L: 41°F

Thu
H: 43°F
L: 39°F

Fri
H: 45°F
L: 39°F

Sat
H: 43°F
L: 31°F

Sun
H: 47°F
L: 33°F
Air Quality
Nitrogen Dioxide: 1.68 μg/m3
Sulphur Dioxide: 0.88 μg/m3
Ozone: 72 μg/m3
Astronomical
Sun Transit: 12:45 AM
Sunset: 5:48 PM
Daylight: 10 hrs 6 mins
Moon Transit: 7:23 PM
Moonset: 11:59 PM
Moon Phase: First Quarter
Moon Illumination: 52.5%
Best Times for Fishing or Hunting
Major Periods
6:25 AM - 8:55 AM6:53 PM - 9:23 PM
Minor Periods
12:00 AM - 12:00 AM2:27 PM - 3:57 PM
Action Rating: 2 out of 5
Special Weather Statement issued October 29 at 6:43AM CDT by NWS Duluth MN
Effective: Wed October 29, 2025, 6:43 AM
Expires: Wed October 29, 2025, 10:00 AM
Patchy fog, locally dense in spots, with a visibility of 1/4 mile or less, has developed across portions of north-central Minnesota and northwest Wisconsin early this morning. Air temperatures were hovering around or a few degrees below freezing as well, therefore some icy spots are also possible. Motorists, including morning commuters, should allow for a little extra time to reach your destination, slow down, and use your low beam headlights if you encounter dense fog. The fog should burn off by 10 am.
Weather Forecast
Average Temperature: 45.5°F
Average Humidity: 80%
Wind: 5.8 mph
UV Index: 0.4
Air Quality
Nitrogen Dioxide: 2.12 μg/m3
Sulphur Dioxide: 1.17 μg/m3
Ozone: 70.88 μg/m3
Astronomical
Sun Transit: 12:45 AM
Sunset: 5:48 PM
Daylight: 10 hrs 6 mins
Moon Transit: 7:23 PM
Moonset: 11:59 PM
Moon Phase: First Quarter
Moon Illumination: 52.5%
Best Times for Fishing or Hunting
Major Periods
6:25 AM - 8:55 AM6:53 PM - 9:23 PM
Minor Periods
12:00 AM - 12:00 AM2:27 PM - 3:57 PM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 41°F
Average Humidity: 86%
Wind: 5.1 mph
UV Index: 0.4
Air Quality
Nitrogen Dioxide: 1.24 μg/m3
Sulphur Dioxide: 0.85 μg/m3
Ozone: 80.48 μg/m3
Astronomical
Sun Transit: 12:44 AM
Sunset: 5:46 PM
Daylight: 10 hrs 3 mins
Moon Transit: 8:11 PM
Moonset: 12:59 AM
Moon Phase: First Quarter
Moon Illumination: 63.7%
Best Times for Fishing or Hunting
Major Periods
7:14 AM - 9:44 AM7:41 PM - 10:11 PM
Minor Periods
2:49 PM - 4:19 PM12:00 AM - 12:00 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 40.7°F
Average Humidity: 81%
Wind: 9.6 mph
UV Index: 0.3
Air Quality
Nitrogen Dioxide: 1.22 μg/m3
Sulphur Dioxide: 1.1 μg/m3
Ozone: 79.92 μg/m3
Astronomical
Sun Transit: 12:44 AM
Sunset: 5:44 PM
Daylight: 10 hrs mins
Moon Transit: 8:58 PM
Moonset: 1:15 AM
Moon Phase: First Quarter
Moon Illumination: 74.1%
Best Times for Fishing or Hunting
Major Periods
8:02 AM - 10:32 AM8:28 PM - 10:58 PM
Minor Periods
3:07 PM - 4:37 PM12:45 AM - 2:15 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 37.4°F
Average Humidity: 66%
Wind: 8.9 mph
UV Index: 0.3
Air Quality
Nitrogen Dioxide: 1 μg/m3
Sulphur Dioxide: 0.77 μg/m3
Ozone: 65.08 μg/m3
Astronomical
Sun Transit: 12:44 AM
Sunset: 5:43 PM
Daylight: 9 hrs 57 mins
Moon Transit: 9:45 PM
Moonset: 2:34 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 83.4%
Best Times for Fishing or Hunting
Major Periods
8:49 AM - 11:19 AM9:15 PM - 11:45 PM
Minor Periods
3:24 PM - 4:54 PM2:04 AM - 3:34 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 40.3°F
Average Humidity: 79%
Wind: 20.4 mph
UV Index: 0
Air Quality
Nitrogen Dioxide: 2.03 μg/m3
Sulphur Dioxide: 1.18 μg/m3
Ozone: 68.15 μg/m3
Astronomical
Sun Transit: 12:44 AM
Sunset: 5:41 PM
Daylight: 9 hrs 53 mins
Moon Transit: 11:31 AM
Moonset: 3:53 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 90.9%
Best Times for Fishing or Hunting
Major Periods
11:01 AM - 1:31 PM11:01 AM - 1:31 PM
Minor Periods
3:41 PM - 5:11 PM3:23 AM - 4:53 AM
Action Rating: 2 out of 5
