Water Temperature of Lake Superior in Grand Marais, MN

Current Water Temperature

58.0°F

Measurement Time: Tuesday, October 7, 2025, 6:30 AM CDT

Temperature Locations

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Lake Superior

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

39.9°F
Clear
Conditions: Clear
Humidity: 70%
Feels Like: 35.8°F
Wind: NNW 5.8 mph
Wind Gusts: 12.2 mph
Pressure: 30.37 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Wed
H: 50°F
L: 39°F
Sunny
Thu
H: 54°F
L: 44°F
Overcast
Fri
H: 58°F
L: 48°F
Cloudy
Sat
H: 57°F
L: 47°F
Patchy rain nearby
Sun
H: 56°F
L: 48°F

Air Quality

AQI: 1 - Good
PM2.5: 1.78 μg/m3
PM10: 1.88 μg/m3
Carbon Monoxide: 129.68 μg/m3
Nitrogen Dioxide: 0.98 μg/m3
Sulphur Dioxide: 0.98 μg/m3
Ozone: 76 μg/m3

Astronomical

Sunrise: 7:11 AM
Sun Transit: 12:48 AM
Sunset: 6:26 PM
Daylight: 11 hrs 16 mins
Moonrise: 6:51 PM
Moon Transit: 1:42 AM
Moonset: 9:17 AM
Moon Phase: Full
Moon Illumination: 95.8%

Best Times for Fishing or Hunting

Major Periods

1:12 AM - 3:42 AM
1:37 PM - 4:07 PM

Minor Periods

6:21 PM - 7:51 PM
8:47 AM - 10:17 AM

Action Rating: 4 out of 5

Freeze Warning issued October 7 at 2:03PM CDT until October 8 at 10:00AM CDT by NWS Duluth MN

Effective: Tue October 7, 2025, 2:03 PM
Expires: Wed October 8, 2025, 2:15 AM

* WHAT...Sub-freezing temperatures as low as 23 expected. * WHERE...In Minnesota, Crow Wing, Aitkin, Pine, Koochiching, Cass, Itasca, Carlton, St. Louis, Cook and Lake Counties. In Wisconsin, Price, Ashland, Bayfield, Burnett, Douglas, Iron, Sawyer, and Washburn Counties. This includes the Tribal Lands of the Red Cliff Band, the St. Croix Band in Burnett County, the Bad River Reservation, the Grand Portage Reservation, the northwestern area of the Lac du Flambeau Band, the Fond du Lac Band, the Lac Courte Oreilles Reservation, the Mille Lacs Band, Big Sandy Lake, Hinckley, Lena Lake and, East Lake areas and the Bois Forte Band, Deer Creek, Nett Lake and, Lake Vermilion areas. Other locations including the Apostle Islands National Lakeshore, Madeline Island and Voyageurs National Park. The entire Boundary Waters is also included. * WHEN...From 10 PM this evening to 10 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Widespread below-freezing temperatures are expected to bring an end to the growing season, with many locations even forecast to see low temperatures dip into the 20s.

Take steps now to protect tender plants from the cold.


Freeze Warning issued October 7 at 9:17PM CDT until October 8 at 10:00AM CDT by NWS Duluth MN

Effective: Tue October 7, 2025, 9:17 PM
Expires: Wed October 8, 2025, 9:30 AM

* WHAT...Sub-freezing temperatures as low as 23 expected. * WHERE...In Minnesota, Crow Wing, Aitkin, Pine, Koochiching, Cass, Itasca, Carlton, St. Louis, Cook and Lake Counties. In Wisconsin, Price, Ashland, Bayfield, Burnett, Douglas, Iron, Sawyer, and Washburn Counties. This includes the Tribal Lands of the Grand Portage Reservation, the St. Croix Band in Burnett County, the Fond du Lac Band, the northwestern area of the Lac du Flambeau Band, the Red Cliff Band, the Bad River Reservation, the Lac Courte Oreilles Reservation, the Mille Lacs Band, Big Sandy Lake, Hinckley, Lena Lake and, East Lake areas and the Bois Forte Band, Nett Lake, Lake Vermilion and, Deer Creek areas. Other locations including Voyageurs National Park, the Apostle Islands National Lakeshore and Madeline Island. The entire Boundary Waters is also included. * WHEN...Until 10 AM CDT Wednesday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...Widespread below-freezing temperatures are expected to bring an end to the growing season, with many locations even forecast to see low temperatures dip into the 20s.

Take steps now to protect tender plants from the cold.


Wednesday, October 8, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 44.1°F
Average Humidity: 62%
Chance of Rain: 0%
Wind: 8.7 mph
UV Index: 0.7

Air Quality

AQI: 1 - Good
PM2.5: 1.6 μg/m3
PM10: 1.69 μg/m3
Carbon Monoxide: 129.4 μg/m3
Nitrogen Dioxide: 1 μg/m3
Sulphur Dioxide: 0.88 μg/m3
Ozone: 77.24 μg/m3

Astronomical

Sunrise: 7:11 AM
Sun Transit: 12:48 AM
Sunset: 6:26 PM
Daylight: 11 hrs 16 mins
Moonrise: 6:51 PM
Moon Transit: 1:42 AM
Moonset: 9:17 AM
Moon Phase: Full
Moon Illumination: 95.8%

Best Times for Fishing or Hunting

Major Periods

1:12 AM - 3:42 AM
1:37 PM - 4:07 PM

Minor Periods

6:21 PM - 7:51 PM
8:47 AM - 10:17 AM

Action Rating: 4 out of 5

Thursday, October 9, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 50.5°F
Average Humidity: 74%
Chance of Rain: 0%
Wind: 10.7 mph
UV Index: 0.7

Air Quality

AQI: 1 - Good
PM2.5: 2.43 μg/m3
PM10: 2.52 μg/m3
Carbon Monoxide: 138.76 μg/m3
Nitrogen Dioxide: 1.4 μg/m3
Sulphur Dioxide: 1.17 μg/m3
Ozone: 84.44 μg/m3

Astronomical

Sunrise: 7:12 AM
Sun Transit: 12:48 AM
Sunset: 6:24 PM
Daylight: 11 hrs 12 mins
Moonrise: 7:22 PM
Moon Transit: 2:39 AM
Moonset: 10:48 AM
Moon Phase: Waning Gibbous
Moon Illumination: 90.1%

Best Times for Fishing or Hunting

Major Periods

2:09 AM - 4:39 AM
2:36 PM - 5:06 PM

Minor Periods

6:52 PM - 8:22 PM
10:18 AM - 11:48 AM

Action Rating: 3 out of 5

Friday, October 10, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 52.8°F
Average Humidity: 80%
Chance of Rain: 0%
Wind: 19 mph
UV Index: 0.6

Air Quality

AQI: 1 - Good
PM2.5: 4.26 μg/m3
PM10: 4.41 μg/m3
Carbon Monoxide: 152.64 μg/m3
Nitrogen Dioxide: 1.63 μg/m3
Sulphur Dioxide: 1.03 μg/m3
Ozone: 79.2 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:48 AM
Sunset: 6:22 PM
Daylight: 11 hrs 9 mins
Moonrise: 8:04 PM
Moon Transit: 3:40 AM
Moonset: 12:15 AM
Moon Phase: Waning Gibbous
Moon Illumination: 82.3%

Best Times for Fishing or Hunting

Major Periods

3:10 AM - 5:40 AM
3:38 PM - 6:08 PM

Minor Periods

7:34 PM - 9:04 PM
11:45 AM - 1:15 PM

Action Rating: 3 out of 5

Saturday, October 11, 2025

Weather Forecast

Conditions: Cloudy
Average Temperature: 51.5°F
Average Humidity: 84%
Chance of Rain: 0%
Wind: 13.6 mph
UV Index: 0.5

Air Quality

AQI: 1 - Good
PM2.5: 1.22 μg/m3
PM10: 1.23 μg/m3
Carbon Monoxide: 136.28 μg/m3
Nitrogen Dioxide: 1.28 μg/m3
Sulphur Dioxide: 0.91 μg/m3
Ozone: 67.08 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:47 AM
Sunset: 6:20 PM
Daylight: 11 hrs 5 mins
Moonrise: 8:59 PM
Moon Transit: 4:43 AM
Moonset: 1:31 PM
Moon Phase: Waning Gibbous
Moon Illumination: 72.9%

Best Times for Fishing or Hunting

Major Periods

4:13 AM - 6:43 AM
4:42 PM - 7:12 PM

Minor Periods

8:29 PM - 9:59 PM
1:01 PM - 2:31 PM

Action Rating: 2 out of 5

Sunday, October 12, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 52.4°F
Average Humidity: 89%
Chance of Rain: 57%
Wind: 13.6 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 1.66 μg/m3
PM10: 1.68 μg/m3
Carbon Monoxide: 156.83 μg/m3
Nitrogen Dioxide: 1.35 μg/m3
Sulphur Dioxide: 0.8 μg/m3
Ozone: 80.23 μg/m3

Astronomical

Sunrise: 7:16 AM
Sun Transit: 12:47 AM
Sunset: 6:18 PM
Daylight: 11 hrs 2 mins
Moonrise: 10:08 PM
Moon Transit: 5:47 AM
Moonset: 2:32 PM
Moon Phase: Waning Gibbous
Moon Illumination: 62.3%

Best Times for Fishing or Hunting

Major Periods

5:17 AM - 7:47 AM
5:45 PM - 8:15 PM

Minor Periods

9:38 PM - 11:08 PM
2:02 PM - 3:32 PM

Action Rating: 2 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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