Water Temperature of Lake Superior in Grand Marais, MN

Current Water Temperature

37.0°F

Measurement Time: Wednesday, April 15, 2026, 6:15 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

32.5°F
Fog
Fog
29.4°F
36.4°F
96%
SSW 3.4 mph
6.1 mph
33.3°F
36.3°F
0 in
0%
0 mi
1009 mbar
1.1

Five Day Weather Forecast

Fog
Thu
H: 43°F
L: 36°F
Moderate rain
Fri
H: 46°F
L: 34°F
Moderate or heavy snow showers
Sat
H: 30°F
L: 25°F
Partly Cloudy
Sun
H: 37°F
L: 22°F
Partly Cloudy
Mon
H: 38°F
L: 25°F

Air Quality

AQI: 1 - Good
PM2.5: 3.28 μg/m3
PM10: 4.68 μg/m3
Carbon Monoxide: 157.68 μg/m3
Nitrogen Dioxide: 2.68 μg/m3
Sulphur Dioxide: 0.68 μg/m3
Ozone: 70 μg/m3

Astronomical

Sunrise: 6:10 AM
Sun Transit: 1:01 PM
Sunset: 7:53 PM
Daylight: 13 hrs 43 mins
Moonrise: 5:31 AM
Moon Transit: 12:16 AM
Moonset: 7:20 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:46 AM - 2:16 PM

Minor Periods

6:50 PM - 8:20 PM
5:01 AM - 6:31 AM

Action Rating: 5 out of 5

Dense Fog Advisory issued April 15 at 9:40PM CDT until April 16 at 10:00AM CDT by NWS Duluth MN

Effective: Wed April 15, 2026, 9:40 PM
Expires: Thu April 16, 2026, 9:45 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...In Minnesota, Carlton and South St. Louis, Southern Cook and Southern Lake Counties. In Wisconsin, Ashland, Bayfield, Douglas, and Iron Counties. This includes the Tribal Lands of the Red Cliff Band, the Bad River Reservation, the northwestern area of the Lac du Flambeau Band, the Grand Portage Reservation and the Fond du Lac Band. Other locations including the Apostle Islands National Lakeshore and Madeline Island. * WHEN...Until 10 AM CDT Thursday. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Fog will develop tonight around Lake Superior and will be dense overnight. Visibility will improve Thursday morning.

If driving, slow down, use your low-beam headlights and fog lights, and leave plenty of distance ahead of you.


Dense Fog Advisory issued April 16 at 2:02AM CDT until April 16 at 10:00AM CDT by NWS Duluth MN

Effective: Thu April 16, 2026, 2:02 AM
Expires: Thu April 16, 2026, 10:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...In Minnesota, Carlton and South St. Louis, Southern Cook and Southern Lake Counties. In Wisconsin, Ashland, Bayfield, Douglas, and Iron Counties. This includes the Tribal Lands of the northwestern area of the Lac du Flambeau Band, the Grand Portage Reservation, the Red Cliff Band, the Fond du Lac Band and the Bad River Reservation. Other locations including the Apostle Islands National Lakeshore and Madeline Island. * WHEN...Until 10 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Fog is expected to be most dense closest to Lake Superior. While most fog should burn off through this morning, some areas along the immediate Lake Superior coastline could see patchy dense fog continue through the day today.

If driving, slow down, use your low-beam headlights and fog lights, and leave plenty of distance ahead of you.
Thursday, April 16, 2026

Weather Forecast

Fog
43°F
35.8°F
38°F
97%
0 in
0%
0%
13 mph
0.9


Air Quality

AQI: 1 - Good
PM2.5: 6.15 μg/m3
PM10: 8.25 μg/m3
Carbon Monoxide: 163.28 μg/m3
Nitrogen Dioxide: 3.31 μg/m3
Sulphur Dioxide: 0.81 μg/m3
Ozone: 78.68 μg/m3

Astronomical

Sunrise: 6:10 AM
Sun Transit: 1:01 PM
Sunset: 7:53 PM
Daylight: 13 hrs 43 mins
Moonrise: 5:31 AM
Moon Transit: 12:16 AM
Moonset: 7:20 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:46 AM - 2:16 PM

Minor Periods

6:50 PM - 8:20 PM
5:01 AM - 6:31 AM

Action Rating: 5 out of 5

Friday, April 17, 2026

Weather Forecast

Moderate rain
46°F
33.6°F
40.2°F
96%
0.71 in
85%
3%
23.5 mph
0.8


Air Quality

AQI: 1 - Good
PM2.5: 7.02 μg/m3
PM10: 8.23 μg/m3
Carbon Monoxide: 155.16 μg/m3
Nitrogen Dioxide: 2.35 μg/m3
Sulphur Dioxide: 1.09 μg/m3
Ozone: 89.8 μg/m3

Astronomical

Sunrise: 6:08 AM
Sun Transit: 1:00 PM
Sunset: 7:54 PM
Daylight: 13 hrs 46 mins
Moonrise: 5:50 AM
Moon Transit: 1:08 PM
Moonset: 8:47 PM
Moon Phase: New
Moon Illumination: 4.1%

Best Times for Fishing or Hunting

Major Periods

12:09 AM - 2:39 AM
12:38 AM - 3:08 PM

Minor Periods

8:17 PM - 9:47 PM
5:20 AM - 6:50 AM

Action Rating: 4 out of 5

Saturday, April 18, 2026

Weather Forecast

Moderate or heavy snow showers
30.3°F
25.2°F
28.4°F
64%
0.08 in
73%
7%
21 mph
1.1


Air Quality

AQI: 1 - Good
PM2.5: 1.71 μg/m3
PM10: 1.88 μg/m3
Carbon Monoxide: 157.04 μg/m3
Nitrogen Dioxide: 1.4 μg/m3
Sulphur Dioxide: 0.71 μg/m3
Ozone: 87.44 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 1:00 PM
Sunset: 7:56 PM
Daylight: 13 hrs 49 mins
Moonrise: 6:15 AM
Moon Transit: 2:05 PM
Moonset: 10:15 PM
Moon Phase: New
Moon Illumination: 1.2%

Best Times for Fishing or Hunting

Major Periods

1:03 AM - 3:33 AM
1:35 PM - 4:05 PM

Minor Periods

9:45 PM - 11:15 PM
5:45 AM - 7:15 AM

Action Rating: 4 out of 5

Sunday, April 19, 2026

Weather Forecast

Partly Cloudy
36.5°F
22.1°F
28.2°F
54%
0 in
0%
9%
18.3 mph
1.1


Air Quality

AQI: 1 - Good
PM2.5: 2.03 μg/m3
PM10: 2.51 μg/m3
Carbon Monoxide: 153.86 μg/m3
Nitrogen Dioxide: 0.87 μg/m3
Sulphur Dioxide: 0.9 μg/m3
Ozone: 95.92 μg/m3

Astronomical

Sunrise: 6:05 AM
Sun Transit: 1:00 PM
Sunset: 7:57 PM
Daylight: 13 hrs 52 mins
Moonrise: 6:47 AM
Moon Transit: 3:06 PM
Moonset: 11:41 PM
Moon Phase: Waxing Crescent
Moon Illumination: 4.9%

Best Times for Fishing or Hunting

Major Periods

2:02 AM - 4:32 AM
2:36 PM - 5:06 PM

Minor Periods

12:00 AM - 12:00 AM
6:17 AM - 7:47 AM

Action Rating: 3 out of 5

Monday, April 20, 2026

Weather Forecast

Partly Cloudy
38.2°F
24.7°F
31°F
65%
0 in
0%
0%
11.2 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 2.69 μg/m3
PM10: 3.32 μg/m3
Carbon Monoxide: 159.19 μg/m3
Nitrogen Dioxide: 1.22 μg/m3
Sulphur Dioxide: 1.21 μg/m3
Ozone: 95.15 μg/m3

Astronomical

Sunrise: 6:03 AM
Sun Transit: 1:00 PM
Sunset: 7:59 PM
Daylight: 13 hrs 56 mins
Moonrise: 7:30 AM
Moon Transit: 4:10 PM
Moonset: 12:41 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.8%

Best Times for Fishing or Hunting

Major Periods

3:05 AM - 5:35 AM
3:40 PM - 6:10 PM

Minor Periods

7:00 AM - 8:30 AM
12:00 AM - 12:00 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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