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

48.9°F
Sunny
Sunny
46.1°F
61°F
97%
E 6.5 mph
12.4 mph
61°F
51°F
0 in
0%
6 mi
1015 mbar
2.7

Five Day Weather Forecast

Partly Cloudy
Fri
H: 63°F
L: 57°F
Sunny
Sat
H: 65°F
L: 54°F
Patchy rain nearby
Sun
H: 71°F
L: 57°F
Sunny
Mon
H: 76°F
L: 61°F
Sunny
Tue
H: 75°F
L: 60°F

Air Quality

AQI: 1 - Good
PM2.5: 7 μg/m3
PM10: 7.5 μg/m3
Carbon Monoxide: 125 μg/m3
Nitrogen Dioxide: 1.1 μg/m3
Sulphur Dioxide: 0.5 μg/m3
Ozone: 87 μg/m3

Astronomical

Sunrise: 5:14 AM
Sun Transit: 1:06 PM
Sunset: 8:59 PM
Daylight: 15 hrs 46 mins
Moonrise: 1:04 AM
Moon Transit: 9:11 AM
Moonset: 5:36 PM
Moon Phase: Waning Crescent
Moon Illumination: 9.7%

Best Times for Fishing or Hunting

Major Periods

8:41 AM - 11:11 AM
9:09 PM - 11:39 PM

Minor Periods

5:06 PM - 6:36 PM
12:34 AM - 2:04 AM

Action Rating: 3 out of 5

Dense Fog Advisory issued July 9 at 11:39PM CDT until July 10 at 10:00AM CDT by NWS Duluth MN

Effective: Thu July 9, 2026, 11:39 PM
Expires: Fri July 10, 2026, 10:00 AM

* WHAT...Dense fog will reduce visibility to less than 1 NM. * WHERE...Grand Portage to Grand Marais MN, Grand Marais to Taconite Harbor MN and Taconite Harbor to Silver Bay Harbor MN. * WHEN...Until 10 AM CDT Friday. * IMPACTS...Low visibility will make navigation difficult. * ADDITIONAL DETAILS...Coverage may be intermittent.

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.
Friday, July 10, 2026

Weather Forecast

Partly Cloudy
63.1°F
57°F
60.2°F
67%
0 in
7%
0%
6.7 mph
7.1


Air Quality

AQI: 1 - Good
PM2.5: 6.07 μg/m3
PM10: 6.58 μg/m3
Carbon Monoxide: 125.54 μg/m3
Nitrogen Dioxide: 1.49 μg/m3
Sulphur Dioxide: 0.55 μg/m3
Ozone: 86.13 μg/m3

Astronomical

Sunrise: 5:14 AM
Sun Transit: 1:06 PM
Sunset: 8:59 PM
Daylight: 15 hrs 46 mins
Moonrise: 1:04 AM
Moon Transit: 9:11 AM
Moonset: 5:36 PM
Moon Phase: Waning Crescent
Moon Illumination: 9.7%

Best Times for Fishing or Hunting

Major Periods

8:41 AM - 11:11 AM
9:09 PM - 11:39 PM

Minor Periods

5:06 PM - 6:36 PM
12:34 AM - 2:04 AM

Action Rating: 3 out of 5

Saturday, July 11, 2026

Weather Forecast

Sunny
64.6°F
53.6°F
59.7°F
77%
0 in
14%
0%
7.8 mph
8.2


Air Quality

AQI: 1 - Good
PM2.5: 7.31 μg/m3
PM10: 8.2 μg/m3
Carbon Monoxide: 125.38 μg/m3
Nitrogen Dioxide: 1.18 μg/m3
Sulphur Dioxide: 0.54 μg/m3
Ozone: 104.21 μg/m3

Astronomical

Sunrise: 5:15 AM
Sun Transit: 1:06 PM
Sunset: 8:59 PM
Daylight: 15 hrs 44 mins
Moonrise: 1:42 AM
Moon Transit: 10:14 AM
Moonset: 6:57 PM
Moon Phase: Waning Crescent
Moon Illumination: 4.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:44 AM - 12:14 AM

Minor Periods

6:27 PM - 7:57 PM
1:12 AM - 2:42 AM

Action Rating: 2 out of 5

Sunday, July 12, 2026

Weather Forecast

Patchy rain nearby
70.6°F
57.3°F
64.3°F
88%
0.06 in
67%
0%
8.1 mph
7.7


Air Quality

AQI: 1 - Good
PM2.5: 7.22 μg/m3
PM10: 7.58 μg/m3
Carbon Monoxide: 123.38 μg/m3
Nitrogen Dioxide: 1.37 μg/m3
Sulphur Dioxide: 0.45 μg/m3
Ozone: 105.63 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 1:07 PM
Sunset: 8:58 PM
Daylight: 15 hrs 42 mins
Moonrise: 2:36 AM
Moon Transit: 11:20 AM
Moonset: 8:05 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:50 AM - 1:20 PM

Minor Periods

7:35 PM - 9:05 PM
2:06 AM - 3:36 AM

Action Rating: 3 out of 5

Monday, July 13, 2026

Weather Forecast

Sunny
75.9°F
61°F
68.2°F
77%
0 in
11%
0%
18.3 mph
8.8


Air Quality

AQI: 1 - Good
PM2.5: 5.52 μg/m3
PM10: 5.68 μg/m3
Carbon Monoxide: 130.85 μg/m3
Nitrogen Dioxide: 1.19 μg/m3
Sulphur Dioxide: 0.42 μg/m3
Ozone: 105 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 1:07 PM
Sunset: 8:57 PM
Daylight: 15 hrs 41 mins
Moonrise: 3:46 AM
Moon Transit: 12:27 AM
Moonset: 8:58 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:57 AM - 2:27 PM

Minor Periods

8:28 PM - 9:58 PM
3:16 AM - 4:46 AM

Action Rating: 4 out of 5

Tuesday, July 14, 2026

Weather Forecast

Sunny
74.7°F
60.3°F
65.7°F
61%
0 in
7%
0%
13 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 3.5 μg/m3
PM10: 3.64 μg/m3
Carbon Monoxide: 163.13 μg/m3
Nitrogen Dioxide: 1.94 μg/m3
Sulphur Dioxide: 0.6 μg/m3
Ozone: 98.63 μg/m3

Astronomical

Sunrise: 5:17 AM
Sun Transit: 1:07 PM
Sunset: 8:56 PM
Daylight: 15 hrs 39 mins
Moonrise: 5:09 AM
Moon Transit: 1:31 PM
Moonset: 9:35 PM
Moon Phase: New
Moon Illumination: 1.9%

Best Times for Fishing or Hunting

Major Periods

12:27 AM - 2:57 AM
1:01 PM - 3:31 PM

Minor Periods

9:05 PM - 10:35 PM
4:39 AM - 6:09 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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