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

73.9°F
Sunny
Sunny
76.5°F
75.5°F
56%
NNW 2.2 mph
4.2 mph
70.2°F
48.2°F
0 in
0%
6 mi
1021 mbar
0.6

Five Day Weather Forecast

Sunny
Wed
H: 73°F
L: 65°F
Partly Cloudy
Thu
H: 71°F
L: 59°F
Light rain shower
Fri
H: 65°F
L: 56°F
Fog
Sat
H: 72°F
L: 56°F
Sunny
Sun
H: 65°F
L: 55°F

Air Quality

AQI: 1 - Good
PM2.5: 6.9 μg/m3
PM10: 7.1 μg/m3
Carbon Monoxide: 106 μg/m3
Nitrogen Dioxide: 1.7 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 78 μg/m3

Astronomical

Sunrise: 5:18 AM
Sun Transit: 1:07 PM
Sunset: 8:56 PM
Daylight: 15 hrs 37 mins
Moonrise: 6:38 AM
Moon Transit: 2:29 PM
Moonset: 10:03 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

1:28 AM - 3:58 AM
1:59 PM - 4:29 PM

Minor Periods

9:33 PM - 11:03 PM
6:08 AM - 7:38 AM

Action Rating: 3 out of 5

Dense Smoke Advisory issued July 15 at 5:31AM CDT until July 16 at 4:00PM CDT by NWS Duluth MN

Effective: Wed July 15, 2026, 5:31 AM
Expires: Wed July 15, 2026, 5:45 PM

* WHAT...Dense smoke will reduce visibility to less than 1 NM. * WHERE...Grand Portage to Silver Bay Harbor MN. * WHEN...Until 4 PM CDT Thursday. * 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 Smoke Advisory issued July 15 at 10:10AM CDT until July 16 at 4:00PM CDT by NWS Duluth MN

Effective: Wed July 15, 2026, 10:10 AM
Expires: Wed July 15, 2026, 10:15 PM

* WHAT...Dense smoke will reduce visibility to 2 to 3 NM. * WHERE...Grand Portage to Grand Marais MN, Grand Marais to Taconite Harbor MN and Taconite Harbor to Silver Bay Harbor MN. * WHEN...Until 4 PM CDT Thursday. * 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.
Wednesday, July 15, 2026

Weather Forecast

Sunny
72.7°F
64.6°F
69.8°F
40%
0 in
3%
0%
9.2 mph
1.8


Air Quality

AQI: 1 - Good
PM2.5: 13.18 μg/m3
PM10: 13.6 μg/m3
Carbon Monoxide: 111.08 μg/m3
Nitrogen Dioxide: 2.42 μg/m3
Sulphur Dioxide: 0.55 μg/m3
Ozone: 82.83 μg/m3

Astronomical

Sunrise: 5:18 AM
Sun Transit: 1:07 PM
Sunset: 8:56 PM
Daylight: 15 hrs 37 mins
Moonrise: 6:38 AM
Moon Transit: 2:29 PM
Moonset: 10:03 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

1:28 AM - 3:58 AM
1:59 PM - 4:29 PM

Minor Periods

9:33 PM - 11:03 PM
6:08 AM - 7:38 AM

Action Rating: 3 out of 5

Thursday, July 16, 2026

Weather Forecast

Partly Cloudy
71.1°F
59°F
63.6°F
66%
0.04 in
42%
0%
8.5 mph
1.1


Air Quality

AQI: 2 - Moderate
PM2.5: 22.35 μg/m3
PM10: 22.88 μg/m3
Carbon Monoxide: 145.96 μg/m3
Nitrogen Dioxide: 2.66 μg/m3
Sulphur Dioxide: 0.77 μg/m3
Ozone: 75.38 μg/m3

Astronomical

Sunrise: 5:19 AM
Sun Transit: 1:07 PM
Sunset: 8:55 PM
Daylight: 15 hrs 35 mins
Moonrise: 8:03 AM
Moon Transit: 3:22 PM
Moonset: 10:24 PM
Moon Phase: New
Moon Illumination: 2.4%

Best Times for Fishing or Hunting

Major Periods

2:24 AM - 4:54 AM
2:52 PM - 5:22 PM

Minor Periods

9:54 PM - 11:24 PM
7:33 AM - 9:03 AM

Action Rating: 4 out of 5

Friday, July 17, 2026

Weather Forecast

Light rain shower
64.7°F
55.8°F
59.3°F
94%
1.17 in
88%
0%
8.1 mph
6.4


Air Quality

AQI: 1 - Good
PM2.5: 7.53 μg/m3
PM10: 7.82 μg/m3
Carbon Monoxide: 124.04 μg/m3
Nitrogen Dioxide: 0.99 μg/m3
Sulphur Dioxide: 0.26 μg/m3
Ozone: 78.88 μg/m3

Astronomical

Sunrise: 5:21 AM
Sun Transit: 1:07 PM
Sunset: 8:54 PM
Daylight: 15 hrs 33 mins
Moonrise: 9:24 AM
Moon Transit: 4:11 PM
Moonset: 10:42 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.0%

Best Times for Fishing or Hunting

Major Periods

3:14 AM - 5:44 AM
3:41 PM - 6:11 PM

Minor Periods

10:12 PM - 11:42 PM
8:54 AM - 10:24 AM

Action Rating: 3 out of 5

Saturday, July 18, 2026

Weather Forecast

Fog
71.5°F
55.6°F
62.9°F
85%
0 in
29%
0%
12.8 mph
1.1


Air Quality

AQI: 1 - Good
PM2.5: 5.7 μg/m3
PM10: 5.94 μg/m3
Carbon Monoxide: 127.64 μg/m3
Nitrogen Dioxide: 1.11 μg/m3
Sulphur Dioxide: 0.28 μg/m3
Ozone: 82.83 μg/m3

Astronomical

Sunrise: 5:22 AM
Sun Transit: 1:07 PM
Sunset: 8:53 PM
Daylight: 15 hrs 31 mins
Moonrise: 10:42 AM
Moon Transit: 4:56 PM
Moonset: 10:57 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.9%

Best Times for Fishing or Hunting

Major Periods

4:01 AM - 6:31 AM
4:26 PM - 6:56 PM

Minor Periods

10:27 PM - 11:57 PM
10:12 AM - 11:42 AM

Action Rating: 2 out of 5

Sunday, July 19, 2026

Weather Forecast

Sunny
65°F
55°F
60.2°F
80%
0 in
12%
0%
12.5 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 9.16 μg/m3
PM10: 9.44 μg/m3
Carbon Monoxide: 188 μg/m3
Nitrogen Dioxide: 0.75 μg/m3
Sulphur Dioxide: 0.25 μg/m3
Ozone: 80.13 μg/m3

Astronomical

Sunrise: 5:23 AM
Sun Transit: 1:07 PM
Sunset: 8:52 PM
Daylight: 15 hrs 29 mins
Moonrise: 11:55 AM
Moon Transit: 5:40 PM
Moonset: 11:13 PM
Moon Phase: Waxing Crescent
Moon Illumination: 22.6%

Best Times for Fishing or Hunting

Major Periods

4:45 AM - 7:15 AM
5:10 PM - 7:40 PM

Minor Periods

12:00 AM - 12:00 AM
11:25 AM - 12:55 AM

Action Rating: 2 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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