Water Temperature of Lake Superior in Grand Marais, MN

Current Water Temperature

37.0°F

Measurement Time: Monday, April 20, 2026, 6:14 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°F
Sunny
Sunny
53.9°F
50.2°F
25%
NNW 5.4 mph
9.4 mph
49.2°F
25.3°F
0 in
0%
6 mi
1010 mbar
2.9

Five Day Weather Forecast

Sunny
Tue
H: 52°F
L: 39°F
Sunny
Wed
H: 47°F
L: 33°F
Moderate rain
Thu
H: 45°F
L: 40°F
Heavy rain
Fri
H: 43°F
L: 39°F
Patchy rain nearby
Sat
H: 47°F
L: 33°F

Air Quality

AQI: 1 - Good
PM2.5: 4.28 μg/m3
PM10: 5.28 μg/m3
Carbon Monoxide: 144.68 μg/m3
Nitrogen Dioxide: 2.28 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 80 μg/m3

Astronomical

Sunrise: 6:01 AM
Sun Transit: 1:00 PM
Sunset: 8:00 PM
Daylight: 13 hrs 59 mins
Moonrise: 8:30 AM
Moon Transit: 5:15 PM
Moonset: 12:57 AM
Moon Phase: Waxing Crescent
Moon Illumination: 18.8%

Best Times for Fishing or Hunting

Major Periods

4:10 AM - 6:40 AM
4:45 PM - 7:15 PM

Minor Periods

8:00 AM - 9:30 AM
12:27 AM - 1:57 AM

Action Rating: 2 out of 5

Special Weather Statement issued April 21 at 2:28AM CDT by NWS Duluth MN

Effective: Tue April 21, 2026, 2:28 AM
Expires: Tue April 21, 2026, 8:00 PM

Dry conditions will lead to near critical fire weather conditions today. Minimum relative humidity values of 15 to 20 percent are expected. However, wind speeds will be light around 5 mph. Check burning restrictions and fire danger before burning. For more information on burning restrictions for Minnesota, see www.dnr.state.mn.us/forestry/fire/firerating_restrictions.html.


Tuesday, April 21, 2026

Weather Forecast

Sunny
52.3°F
39.2°F
45.5°F
44%
0 in
0%
0%
6.3 mph
5.7


Air Quality

AQI: 1 - Good
PM2.5: 3.96 μg/m3
PM10: 4.68 μg/m3
Carbon Monoxide: 155.72 μg/m3
Nitrogen Dioxide: 2.3 μg/m3
Sulphur Dioxide: 0.95 μg/m3
Ozone: 87.84 μg/m3

Astronomical

Sunrise: 6:01 AM
Sun Transit: 1:00 PM
Sunset: 8:00 PM
Daylight: 13 hrs 59 mins
Moonrise: 8:30 AM
Moon Transit: 5:15 PM
Moonset: 12:57 AM
Moon Phase: Waxing Crescent
Moon Illumination: 18.8%

Best Times for Fishing or Hunting

Major Periods

4:10 AM - 6:40 AM
4:45 PM - 7:15 PM

Minor Periods

8:00 AM - 9:30 AM
12:27 AM - 1:57 AM

Action Rating: 2 out of 5

Wednesday, April 22, 2026

Weather Forecast

Sunny
46.8°F
32.5°F
40.5°F
74%
0 in
0%
0%
17.7 mph
6.1


Air Quality

AQI: 1 - Good
PM2.5: 2.9 μg/m3
PM10: 3.91 μg/m3
Carbon Monoxide: 147.72 μg/m3
Nitrogen Dioxide: 2.43 μg/m3
Sulphur Dioxide: 0.84 μg/m3
Ozone: 82.96 μg/m3

Astronomical

Sunrise: 5:59 AM
Sun Transit: 1:00 PM
Sunset: 8:01 PM
Daylight: 14 hrs 2 mins
Moonrise: 9:42 AM
Moon Transit: 6:17 PM
Moonset: 1:57 AM
Moon Phase: Waxing Crescent
Moon Illumination: 28.4%

Best Times for Fishing or Hunting

Major Periods

5:14 AM - 7:44 AM
5:47 PM - 8:17 PM

Minor Periods

9:12 AM - 10:42 AM
1:27 AM - 2:57 AM

Action Rating: 3 out of 5

Thursday, April 23, 2026

Weather Forecast

Moderate rain
45°F
39.6°F
42.6°F
94%
0.62 in
89%
0%
20.6 mph
1.7


Air Quality

AQI: 1 - Good
PM2.5: 7.57 μg/m3
PM10: 7.86 μg/m3
Carbon Monoxide: 156.6 μg/m3
Nitrogen Dioxide: 2.07 μg/m3
Sulphur Dioxide: 0.84 μg/m3
Ozone: 89.92 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 1:00 PM
Sunset: 8:03 PM
Daylight: 14 hrs 6 mins
Moonrise: 11:02 AM
Moon Transit: 7:15 PM
Moonset: 2:41 AM
Moon Phase: First Quarter
Moon Illumination: 39.1%

Best Times for Fishing or Hunting

Major Periods

6:14 AM - 8:44 AM
6:45 PM - 9:15 PM

Minor Periods

10:32 AM - 12:02 AM
2:11 AM - 3:41 AM

Action Rating: 3 out of 5

Friday, April 24, 2026

Weather Forecast

Heavy rain
43.3°F
39.2°F
41.9°F
95%
1.3 in
82%
0%
23 mph
4.2


Air Quality

AQI: 1 - Good
PM2.5: 6.51 μg/m3
PM10: 6.97 μg/m3
Carbon Monoxide: 155.92 μg/m3
Nitrogen Dioxide: 2.45 μg/m3
Sulphur Dioxide: 1.16 μg/m3
Ozone: 94.8 μg/m3

Astronomical

Sunrise: 5:56 AM
Sun Transit: 1:00 PM
Sunset: 8:04 PM
Daylight: 14 hrs 9 mins
Moonrise: 12:23 AM
Moon Transit: 8:08 PM
Moonset: 3:12 AM
Moon Phase: First Quarter
Moon Illumination: 50.4%

Best Times for Fishing or Hunting

Major Periods

7:09 AM - 9:39 AM
7:38 PM - 10:08 PM

Minor Periods

11:53 AM - 1:23 PM
2:42 AM - 4:12 AM

Action Rating: 3 out of 5

Saturday, April 25, 2026

Weather Forecast

Patchy rain nearby
47.3°F
33°F
40.2°F
85%
0.01 in
75%
0%
5.6 mph
0.2


Air Quality

AQI: 1 - Good
PM2.5: 1.22 μg/m3
PM10: 1.25 μg/m3
Carbon Monoxide: 169.59 μg/m3
Nitrogen Dioxide: 1.49 μg/m3
Sulphur Dioxide: 0.76 μg/m3
Ozone: 79.08 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 1:00 PM
Sunset: 8:06 PM
Daylight: 14 hrs 12 mins
Moonrise: 1:41 PM
Moon Transit: 8:55 PM
Moonset: 3:35 AM
Moon Phase: First Quarter
Moon Illumination: 61.6%

Best Times for Fishing or Hunting

Major Periods

7:59 AM - 10:29 AM
8:25 PM - 10:55 PM

Minor Periods

1:11 PM - 2:41 PM
3:05 AM - 4:35 AM

Action Rating: 3 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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