Water Temperature of Lake Superior in Grand Marais, MN

Current Water Temperature

43.0°F

Measurement Time: Sunday, July 26, 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

64°F
Partly Cloudy
Partly Cloudy
52.9°F
64°F
83%
SW 7.2 mph
15 mph
64°F
58.7°F
0 in
43%
6 mi
1006 mbar
0

Five Day Weather Forecast

Partly Cloudy
Sun
H: 66°F
L: 58°F
Patchy rain nearby
Mon
H: 65°F
L: 52°F
Sunny
Tue
H: 66°F
L: 57°F
Sunny
Wed
H: 68°F
L: 56°F
Sunny
Thu
H: 75°F
L: 57°F

Air Quality

AQI: 1 - Good
PM2.5: 13.4 μg/m3
PM10: 13.9 μg/m3
Carbon Monoxide: 137 μg/m3
Nitrogen Dioxide: 1.9 μg/m3
Sulphur Dioxide: 0.5 μg/m3
Ozone: 89 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

Dense Fog Advisory issued July 26 at 10:44AM CDT until July 26 at 9:00PM CDT by NWS Duluth MN

Effective: Sun July 26, 2026, 10:44 AM
Expires: Sun July 26, 2026, 9:00 PM

* WHAT...Dense fog will reduce visibility to 1/4 to 1/2 NM. * WHERE...Portions of Lake Superior. * WHEN...Until 9 PM CDT this evening. * IMPACTS...Low visibility will make navigation difficult. * ADDITIONAL DETAILS...Fog and low stratus was observed on satellite over the open water and along portions of the North Shore. Expect fog to move into the Taconite Harbor to Grand Portage zones and persist into the afternoon. Fog is expected to clear gradually today from southwest to northeast. Conditions will improve near the Twin Ports first as southwest winds push drier air over the water. Conditions will improve latest near Grand Marais and Grand Portage.

If you must navigate, proceed with caution. Use proper fog signals. Make sure all running lights are on. Remember to use your radar and compass.
Sunday, July 26, 2026

Weather Forecast

Partly Cloudy
65.7°F
57.7°F
61.4°F
81%
0 in
15%
0%
11.9 mph
6.9


Air Quality

AQI: 1 - Good
PM2.5: 10.05 μg/m3
PM10: 10.26 μg/m3
Carbon Monoxide: 135.71 μg/m3
Nitrogen Dioxide: 0.92 μg/m3
Sulphur Dioxide: 0.27 μg/m3
Ozone: 72.75 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
65.2°F
51.6°F
59.8°F
94%
0.27 in
88%
0%
7.8 mph
6.6


Air Quality

AQI: 1 - Good
PM2.5: 3.93 μg/m3
PM10: 4.05 μg/m3
Carbon Monoxide: 126.63 μg/m3
Nitrogen Dioxide: 1.41 μg/m3
Sulphur Dioxide: 0.5 μg/m3
Ozone: 69.17 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
65.5°F
56.8°F
60.9°F
70%
0 in
7%
0%
6 mph
6.4


Air Quality

AQI: 1 - Good
PM2.5: 4.1 μg/m3
PM10: 4.21 μg/m3
Carbon Monoxide: 114.21 μg/m3
Nitrogen Dioxide: 1.38 μg/m3
Sulphur Dioxide: 0.45 μg/m3
Ozone: 59.08 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

Wednesday, July 29, 2026

Weather Forecast

Sunny
67.9°F
56.4°F
62.1°F
72%
0.01 in
20%
0%
5.6 mph
7.1


Air Quality

AQI: 1 - Good
PM2.5: 2.53 μg/m3
PM10: 2.74 μg/m3
Carbon Monoxide: 110.09 μg/m3
Nitrogen Dioxide: 1.16 μg/m3
Sulphur Dioxide: 0.25 μg/m3
Ozone: 65.75 μg/m3

Astronomical

Sunrise: 5:34 AM
Sun Transit: 1:07 PM
Sunset: 8:40 PM
Daylight: 15 hrs 6 mins
Moonrise: 8:59 PM
Moon Transit: 12:53 AM
Moonset: 5:19 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:23 AM - 2:53 AM
12:44 AM - 3:14 PM

Minor Periods

8:29 PM - 9:59 PM
4:49 AM - 6:19 AM

Action Rating: 4 out of 5

Thursday, July 30, 2026

Weather Forecast

Sunny
74.9°F
56.5°F
67.7°F
75%
0.01 in
36%
0%
11.9 mph
6.1


Air Quality

AQI: 1 - Good
PM2.5: 1.68 μg/m3
PM10: 1.91 μg/m3
Carbon Monoxide: 145.63 μg/m3
Nitrogen Dioxide: 0.9 μg/m3
Sulphur Dioxide: 0.2 μg/m3
Ozone: 60 μg/m3

Astronomical

Sunrise: 5:36 AM
Sun Transit: 1:07 PM
Sunset: 8:39 PM
Daylight: 15 hrs 3 mins
Moonrise: 9:18 PM
Moon Transit: 1:39 AM
Moonset: 6:31 AM
Moon Phase: Full
Moon Illumination: 97.1%

Best Times for Fishing or Hunting

Major Periods

1:09 AM - 3:39 AM
1:30 PM - 4:00 PM

Minor Periods

8:48 PM - 10:18 PM
6:01 AM - 7:31 AM

Action Rating: 5 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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