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

50.2°F
Sunny
Sunny
46.4°F
61.2°F
80%
WSW 9.4 mph
15.9 mph
61.2°F
50.1°F
0 in
0%
6 mi
1018 mbar
4.6

Five Day Weather Forecast

Sunny
Wed
H: 62°F
L: 53°F
Sunny
Thu
H: 69°F
L: 55°F
Partly Cloudy
Fri
H: 70°F
L: 55°F
Patchy rain nearby
Sat
H: 74°F
L: 56°F
Sunny
Sun
H: 64°F
L: 51°F

Air Quality

AQI: 1 - Good
PM2.5: 4.1 μg/m3
PM10: 4.4 μg/m3
Carbon Monoxide: 92 μg/m3
Nitrogen Dioxide: 0.9 μg/m3
Sulphur Dioxide: 0.2 μg/m3
Ozone: 85 μg/m3

Astronomical

Sunrise: 5:26 AM
Sun Transit: 1:07 PM
Sunset: 8:49 PM
Daylight: 15 hrs 23 mins
Moonrise: 3:28 PM
Moon Transit: 7:53 PM
Moonset: 12:48 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

6:57 AM - 9:27 AM
7:23 PM - 9:53 PM

Minor Periods

2:58 PM - 4:28 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Small Craft Advisory issued July 22 at 2:47AM CDT until July 22 at 10:00PM CDT by NWS Duluth MN

Effective: Wed July 22, 2026, 2:47 AM
Expires: Wed July 22, 2026, 3:00 PM

* WHAT...West winds 5 to 15 kt with gusts up to 25 kt and waves 1 to 2 ft expected. * WHERE...Grand Portage to Grand Marais MN and Grand Marais to Taconite Harbor MN. * WHEN...From 10 AM this morning to 10 PM CDT this evening. * IMPACTS...Conditions will be hazardous to small craft.

Anyone operating a smaller vessel should avoid navigating in hazardous conditions.


Small Craft Advisory issued July 22 at 9:30AM CDT until July 22 at 10:00PM CDT by NWS Duluth MN

Effective: Wed July 22, 2026, 9:30 AM
Expires: Wed July 22, 2026, 10:00 PM

* WHAT...Southwest winds 5 to 15 kt with gusts up to 25 kt and waves 1 to 3 ft expected. * WHERE...Grand Portage to Grand Marais MN and Grand Marais to Taconite Harbor MN. * WHEN...From 3 PM this afternoon to 10 PM CDT this evening. * IMPACTS...Conditions will be hazardous to small craft.

Anyone operating a smaller vessel should avoid navigating in hazardous conditions.
Wednesday, July 22, 2026

Weather Forecast

Sunny
62.4°F
53.4°F
58.6°F
63%
0 in
4%
0%
11.4 mph
6.7


Air Quality

AQI: 1 - Good
PM2.5: 4.84 μg/m3
PM10: 5.13 μg/m3
Carbon Monoxide: 95.46 μg/m3
Nitrogen Dioxide: 1.07 μg/m3
Sulphur Dioxide: 0.15 μg/m3
Ozone: 74.13 μg/m3

Astronomical

Sunrise: 5:26 AM
Sun Transit: 1:07 PM
Sunset: 8:49 PM
Daylight: 15 hrs 23 mins
Moonrise: 3:28 PM
Moon Transit: 7:53 PM
Moonset: 12:48 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

6:57 AM - 9:27 AM
7:23 PM - 9:53 PM

Minor Periods

2:58 PM - 4:28 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, July 23, 2026

Weather Forecast

Sunny
69°F
55.1°F
62°F
63%
0 in
6%
0%
12.3 mph
7.4


Air Quality

AQI: 1 - Good
PM2.5: 9.63 μg/m3
PM10: 9.87 μg/m3
Carbon Monoxide: 148.63 μg/m3
Nitrogen Dioxide: 1.4 μg/m3
Sulphur Dioxide: 0.31 μg/m3
Ozone: 86.71 μg/m3

Astronomical

Sunrise: 5:27 AM
Sun Transit: 1:07 PM
Sunset: 8:48 PM
Daylight: 15 hrs 21 mins
Moonrise: 4:37 PM
Moon Transit: 8:41 PM
Moonset: 12:11 AM
Moon Phase: First Quarter
Moon Illumination: 66.1%

Best Times for Fishing or Hunting

Major Periods

7:44 AM - 10:14 AM
8:11 PM - 10:41 PM

Minor Periods

4:07 PM - 5:37 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Friday, July 24, 2026

Weather Forecast

Partly Cloudy
69.7°F
55.3°F
62.3°F
77%
0 in
11%
0%
16.3 mph
6.9


Air Quality

AQI: 1 - Good
PM2.5: 6.78 μg/m3
PM10: 6.95 μg/m3
Carbon Monoxide: 168.21 μg/m3
Nitrogen Dioxide: 1.51 μg/m3
Sulphur Dioxide: 0.35 μg/m3
Ozone: 102.96 μg/m3

Astronomical

Sunrise: 5:28 AM
Sun Transit: 1:07 PM
Sunset: 8:47 PM
Daylight: 15 hrs 18 mins
Moonrise: 5:42 PM
Moon Transit: 9:31 PM
Moonset: 12:41 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

8:33 AM - 11:03 AM
9:01 PM - 11:31 PM

Minor Periods

5:12 PM - 6:42 PM
12:11 AM - 1:41 AM

Action Rating: 3 out of 5

Saturday, July 25, 2026

Weather Forecast

Patchy rain nearby
73.9°F
56.2°F
65.1°F
80%
0.08 in
63%
0%
14.8 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 5.2 μg/m3
PM10: 5.32 μg/m3
Carbon Monoxide: 138.13 μg/m3
Nitrogen Dioxide: 1.48 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 96.08 μg/m3

Astronomical

Sunrise: 5:30 AM
Sun Transit: 1:07 PM
Sunset: 8:45 PM
Daylight: 15 hrs 16 mins
Moonrise: 6:40 PM
Moon Transit: 10:22 PM
Moonset: 1:18 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.2%

Best Times for Fishing or Hunting

Major Periods

9:24 AM - 11:54 AM
12:00 AM - 12:00 AM

Minor Periods

6:10 PM - 7:40 PM
12:48 AM - 2:18 AM

Action Rating: 2 out of 5

Sunday, July 26, 2026

Weather Forecast

Sunny
64°F
51.3°F
57.8°F
82%
0 in
19%
0%
8.5 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 5.06 μg/m3
PM10: 5.09 μg/m3
Carbon Monoxide: 198.38 μg/m3
Nitrogen Dioxide: 0.84 μg/m3
Sulphur Dioxide: 0.26 μg/m3
Ozone: 56.75 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

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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