Water Temperature of Lake Superior in Grand Marais, MN

Current Water Temperature

40.0°F

Measurement Time: Monday, June 8, 2026, 5:00 AM CDT

Temperature Locations

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Lake Superior

Station Name: Grand Marais
Data Source: USGS

Elevation Above Sea Level: 607 feet

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

55.9°F
Patchy rain nearby
Patchy rain nearby
53°F
63.3°F
87%
SW 11.6 mph
24.3 mph
63.3°F
55.7°F
0 in
0%
6 mi
1012 mbar
2.4

Five Day Weather Forecast

Partly Cloudy
Fri
H: 63°F
L: 55°F
Sunny
Sat
H: 70°F
L: 59°F
Sunny
Sun
H: 69°F
L: 57°F
Patchy rain nearby
Mon
H: 67°F
L: 54°F
Sunny
Tue
H: 68°F
L: 56°F

Air Quality

AQI: 1 - Good
PM2.5: 4.7 μg/m3
PM10: 4.9 μg/m3
Carbon Monoxide: 147 μg/m3
Nitrogen Dioxide: 1.2 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 115 μg/m3

Astronomical

Sunrise: 5:28 AM
Sun Transit: 1:07 PM
Sunset: 8:47 PM
Daylight: 15 hrs 18 mins
Moonrise: 5:42 PM
Moon Transit: 9:31 PM
Moonset: 12:41 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

8:33 AM - 11:03 AM
9:01 PM - 11:31 PM

Minor Periods

5:12 PM - 6:42 PM
12:11 AM - 1:41 AM

Action Rating: 3 out of 5

Small Craft Advisory issued July 24 at 12:04AM CDT until July 25 at 10:00AM CDT by NWS Duluth MN

Effective: Fri July 24, 2026, 12:04 AM
Expires: Fri July 24, 2026, 12:15 PM

* WHAT...Southwest winds 5 to 15 kt with gusts up to 30 kt and waves 2 to 5 ft expected. * WHERE...Grand Portage to Grand Marais MN. * WHEN...From 3 PM Friday to 10 AM CDT Saturday. * IMPACTS...Conditions will be hazardous to small craft.

Anyone operating a smaller vessel should avoid navigating in hazardous conditions.


Small Craft Advisory issued July 24 at 10:55AM CDT until July 25 at 10:00AM CDT by NWS Duluth MN

Effective: Fri July 24, 2026, 10:55 AM
Expires: Sat July 25, 2026, 6:00 AM

* WHAT...Southwest winds 10 to 20 kt with gusts up to 25 kt and waves 1 to 4 ft expected. * WHERE...Grand Portage to Grand Marais MN. * WHEN...From 3 PM this afternoon to 10 AM CDT Saturday. * IMPACTS...Conditions will be hazardous to small craft.

Anyone operating a smaller vessel should avoid navigating in hazardous conditions.


Small Craft Advisory issued July 24 at 12:04AM CDT until July 25 at 4:00AM CDT by NWS Duluth MN

Effective: Fri July 24, 2026, 12:04 AM
Expires: Fri July 24, 2026, 12:15 PM

* WHAT...Southwest winds 5 to 15 kt with gusts up to 30 kt and waves 1 to 3 ft expected. * WHERE...Grand Marais to Taconite Harbor MN and Taconite Harbor to Silver Bay Harbor MN. * WHEN...From 3 PM Friday to 4 AM CDT Saturday. * IMPACTS...Conditions will be hazardous to small craft.

Anyone operating a smaller vessel should avoid navigating in hazardous conditions.


Small Craft Advisory issued July 24 at 10:55AM CDT until July 25 at 4:00AM CDT by NWS Duluth MN

Effective: Fri July 24, 2026, 10:55 AM
Expires: Sat July 25, 2026, 4:00 AM

* WHAT...Southwest winds 10 to 20 kt with gusts up to 25 kt and waves 1 to 3 ft expected. * WHERE...Grand Marais to Taconite Harbor MN and Taconite Harbor to Silver Bay Harbor MN. * WHEN...From 3 PM this afternoon to 4 AM CDT Saturday. * IMPACTS...Conditions will be hazardous to small craft.

Anyone operating a smaller vessel should avoid navigating in hazardous conditions.
Friday, July 24, 2026

Weather Forecast

Partly Cloudy
63.1°F
55°F
58.6°F
80%
0 in
12%
0%
13.2 mph
7.4


Air Quality

AQI: 1 - Good
PM2.5: 5.95 μg/m3
PM10: 6.14 μg/m3
Carbon Monoxide: 148.29 μg/m3
Nitrogen Dioxide: 1.5 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 93.58 μg/m3

Astronomical

Sunrise: 5:28 AM
Sun Transit: 1:07 PM
Sunset: 8:47 PM
Daylight: 15 hrs 18 mins
Moonrise: 5:42 PM
Moon Transit: 9:31 PM
Moonset: 12:41 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

8:33 AM - 11:03 AM
9:01 PM - 11:31 PM

Minor Periods

5:12 PM - 6:42 PM
12:11 AM - 1:41 AM

Action Rating: 3 out of 5

Saturday, July 25, 2026

Weather Forecast

Sunny
70.3°F
58.5°F
64.4°F
82%
0.25 in
77%
0%
13.9 mph
6.9


Air Quality

AQI: 1 - Good
PM2.5: 6.35 μg/m3
PM10: 6.5 μg/m3
Carbon Monoxide: 127.08 μg/m3
Nitrogen Dioxide: 1.79 μg/m3
Sulphur Dioxide: 0.33 μg/m3
Ozone: 91 μg/m3

Astronomical

Sunrise: 5:30 AM
Sun Transit: 1:07 PM
Sunset: 8:45 PM
Daylight: 15 hrs 16 mins
Moonrise: 6:40 PM
Moon Transit: 10:22 PM
Moonset: 1:18 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.2%

Best Times for Fishing or Hunting

Major Periods

9:24 AM - 11:54 AM
12:00 AM - 12:00 AM

Minor Periods

6:10 PM - 7:40 PM
12:48 AM - 2:18 AM

Action Rating: 2 out of 5

Sunday, July 26, 2026

Weather Forecast

Sunny
69.2°F
56.6°F
61.9°F
77%
0 in
20%
0%
13.6 mph
6.6


Air Quality

AQI: 1 - Good
PM2.5: 6.2 μg/m3
PM10: 6.36 μg/m3
Carbon Monoxide: 126.75 μg/m3
Nitrogen Dioxide: 0.76 μg/m3
Sulphur Dioxide: 0.29 μg/m3
Ozone: 74 μg/m3

Astronomical

Sunrise: 5:31 AM
Sun Transit: 1:07 PM
Sunset: 8:44 PM
Daylight: 15 hrs 13 mins
Moonrise: 7:28 PM
Moon Transit: 11:14 PM
Moonset: 2:06 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.3%

Best Times for Fishing or Hunting

Major Periods

10:15 AM - 12:45 AM
12:00 AM - 12:00 AM

Minor Periods

6:58 PM - 8:28 PM
1:36 AM - 3:06 AM

Action Rating: 3 out of 5

Monday, July 27, 2026

Weather Forecast

Patchy rain nearby
67°F
53.9°F
61.6°F
86%
0.15 in
76%
0%
6.9 mph
7.1


Air Quality

AQI: 1 - Good
PM2.5: 2.55 μg/m3
PM10: 2.61 μg/m3
Carbon Monoxide: 136.04 μg/m3
Nitrogen Dioxide: 1.33 μg/m3
Sulphur Dioxide: 0.44 μg/m3
Ozone: 73.83 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 1:07 PM
Sunset: 8:43 PM
Daylight: 15 hrs 11 mins
Moonrise: 8:06 PM
Moon Transit: 12:00 AM
Moonset: 3:03 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:06 AM - 1:36 PM

Minor Periods

7:36 PM - 9:06 PM
2:33 AM - 4:03 AM

Action Rating: 3 out of 5

Tuesday, July 28, 2026

Weather Forecast

Sunny
67.6°F
56.3°F
61°F
85%
0 in
20%
0%
6.5 mph
6.1


Air Quality

AQI: 1 - Good
PM2.5: 5.74 μg/m3
PM10: 6.03 μg/m3
Carbon Monoxide: 198.38 μg/m3
Nitrogen Dioxide: 1.49 μg/m3
Sulphur Dioxide: 0.31 μg/m3
Ozone: 63.25 μg/m3

Astronomical

Sunrise: 5:33 AM
Sun Transit: 1:07 PM
Sunset: 8:42 PM
Daylight: 15 hrs 8 mins
Moonrise: 8:36 PM
Moon Transit: 12:04 AM
Moonset: 4:09 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:56 AM - 2:26 PM

Minor Periods

8:06 PM - 9:36 PM
3:39 AM - 5:09 AM

Action Rating: 4 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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