Water Temperature of Lake Superior in Grand Marais, MN

Current Water Temperature

44.0°F

Measurement Time: Monday, July 27, 2026, 6:30 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

59.7°F
Partly Cloudy
Partly Cloudy
50.5°F
59.7°F
91%
NW 3.4 mph
7 mph
59.7°F
57°F
0 in
43%
6 mi
1009 mbar
0

Five Day Weather Forecast

Partly Cloudy
Mon
H: 64°F
L: 55°F
Sunny
Tue
H: 66°F
L: 59°F
Sunny
Wed
H: 69°F
L: 58°F
Sunny
Thu
H: 68°F
L: 55°F
Sunny
Fri
H: 71°F
L: 60°F

Air Quality

AQI: 1 - Good
PM2.5: 10.9 μg/m3
PM10: 11.6 μg/m3
Carbon Monoxide: 132 μg/m3
Nitrogen Dioxide: 2.5 μg/m3
Sulphur Dioxide: 0.5 μg/m3
Ozone: 69 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

Dense Fog Advisory issued July 27 at 8:47AM CDT until July 27 at 5:00PM CDT by NWS Duluth MN

Effective: Mon July 27, 2026, 8:47 AM
Expires: Mon July 27, 2026, 5:00 PM

* WHAT...Dense fog will reduce visibility to below 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 5 PM CDT this afternoon. * IMPACTS...Low visibility will make navigation difficult.

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.


Dense Fog Advisory issued July 27 at 1:29PM CDT until July 28 at 11:00AM CDT by NWS Duluth MN

Effective: Mon July 27, 2026, 1:29 PM
Expires: Tue July 28, 2026, 1:30 AM

* WHAT...Dense fog will reduce visibility to below 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 11 AM CDT Tuesday. * IMPACTS...Low visibility will make navigation difficult.

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.


Dense Fog Advisory issued July 27 at 7:06PM CDT until July 28 at 11:00AM CDT by NWS Duluth MN

Effective: Mon July 27, 2026, 7:06 PM
Expires: Tue July 28, 2026, 7:15 AM

* WHAT...Dense fog will reduce visibility to less than 1 NM. * WHERE...Grand Portage to Silver Bay Harbor MN. * WHEN...Until 11 AM CDT Tuesday. * IMPACTS...Low visibility will make navigation difficult.

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.


Dense Fog Advisory issued July 27 at 3:43PM CDT until July 28 at 11:00AM CDT by NWS Duluth MN

Effective: Mon July 27, 2026, 3:43 PM
Expires: Tue July 28, 2026, 3:45 AM

* WHAT...Dense fog will reduce visibility to 1 NM or less. * WHERE...Grand Portage to Grand Marais MN, Grand Marais to Taconite Harbor MN and Taconite Harbor to Silver Bay Harbor MN. * WHEN...Until 11 AM CDT Tuesday. * IMPACTS...Low visibility will make navigation difficult.

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.
Monday, July 27, 2026

Weather Forecast

Partly Cloudy
64.4°F
54.5°F
60.6°F
90%
0.96 in
88%
0%
13.6 mph
6.8


Air Quality

AQI: 1 - Good
PM2.5: 7.98 μg/m3
PM10: 8.32 μg/m3
Carbon Monoxide: 133.04 μg/m3
Nitrogen Dioxide: 1.26 μg/m3
Sulphur Dioxide: 0.49 μg/m3
Ozone: 71.83 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
66.3°F
58.5°F
62.5°F
64%
0 in
17%
0%
6.7 mph
5.3


Air Quality

AQI: 1 - Good
PM2.5: 11.1 μg/m3
PM10: 11.57 μg/m3
Carbon Monoxide: 118.63 μg/m3
Nitrogen Dioxide: 2.17 μg/m3
Sulphur Dioxide: 0.68 μg/m3
Ozone: 65.63 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
68.5°F
57.6°F
62.6°F
69%
0 in
6%
0%
9.6 mph
7.3


Air Quality

AQI: 1 - Good
PM2.5: 7.43 μg/m3
PM10: 7.76 μg/m3
Carbon Monoxide: 111.21 μg/m3
Nitrogen Dioxide: 1.79 μg/m3
Sulphur Dioxide: 0.44 μg/m3
Ozone: 78.79 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
68°F
54.8°F
62.9°F
78%
0.24 in
70%
0%
13.4 mph
6.4


Air Quality

AQI: 1 - Good
PM2.5: 7.85 μg/m3
PM10: 8.33 μg/m3
Carbon Monoxide: 132.83 μg/m3
Nitrogen Dioxide: 1.42 μg/m3
Sulphur Dioxide: 0.38 μg/m3
Ozone: 75 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

Friday, July 31, 2026

Weather Forecast

Sunny
71.2°F
60.1°F
64.5°F
83%
0.02 in
43%
0%
9.4 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 8.53 μg/m3
PM10: 8.98 μg/m3
Carbon Monoxide: 197 μg/m3
Nitrogen Dioxide: 2 μg/m3
Sulphur Dioxide: 0.49 μg/m3
Ozone: 64.5 μg/m3

Astronomical

Sunrise: 5:37 AM
Sun Transit: 1:07 PM
Sunset: 8:38 PM
Daylight: 15 hrs 1 mins
Moonrise: 9:35 PM
Moon Transit: 2:24 AM
Moonset: 7:42 AM
Moon Phase: Full
Moon Illumination: 92.0%

Best Times for Fishing or Hunting

Major Periods

1:54 AM - 4:24 AM
2:13 PM - 4:43 PM

Minor Periods

9:05 PM - 10:35 PM
7:12 AM - 8:42 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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