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

51.1°F
Clear
Clear
47.9°F
63.3°F
89%
ENE 8.3 mph
17.4 mph
63.3°F
54.1°F
0 in
0%
6 mi
1011 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Mon
H: 66°F
L: 58°F
Fog
Tue
H: 73°F
L: 58°F
Sunny
Wed
H: 68°F
L: 56°F
Fog
Thu
H: 68°F
L: 54°F
Patchy rain nearby
Fri
H: 63°F
L: 54°F

Air Quality

PM2.5: 2.9 μg/m3
PM10: 3.1 μg/m3
Carbon Monoxide: 107 μg/m3
Nitrogen Dioxide: 0.7 μg/m3
Sulphur Dioxide: 0.2 μg/m3
Ozone: 87 μg/m3

Astronomical

Sunrise: 5:06 AM
Sun Transit: 1:04 PM
Sunset: 9:04 PM
Daylight: 15 hrs 58 mins
Moonrise: 9:29 PM
Moon Transit: 12:27 AM
Moonset: 4:12 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:20 AM - 2:50 PM

Minor Periods

8:59 PM - 10:29 PM
3:42 AM - 5:12 AM

Action Rating: 5 out of 5

Small Craft Advisory issued June 28 at 5:54AM CDT until June 28 at 10:00PM CDT by NWS Duluth MN

Effective: Sun June 28, 2026, 5:54 AM
Expires: Sun June 28, 2026, 10:00 PM

* WHAT...Northeast winds 10 to 20 kt with gusts up to 25 kt and waves 1 to 5 ft expected. * WHERE...Portions of Lake Superior. * 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 June 28 at 11:53AM CDT until June 28 at 10:00PM CDT by NWS Duluth MN

Effective: Sun June 28, 2026, 11:53 AM
Expires: Sun June 28, 2026, 10:00 PM

* WHAT...Northeast winds 10 to 15 kt with gusts up to 25 kt and waves 1 to 4 ft. * WHERE...Portions of Lake Superior. * WHEN...Until 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 June 28 at 4:01PM CDT until June 28 at 10:00PM CDT by NWS Duluth MN

Effective: Sun June 28, 2026, 4:01 PM
Expires: Sun June 28, 2026, 10:00 PM

* WHAT...Northeast winds 10 to 15 kt with gusts up to 25 kt and waves 2 to 4 ft. * WHERE...Portions of Lake Superior. * WHEN...Until 10 PM CDT this evening. * IMPACTS...Conditions will be hazardous to small craft.

Anyone operating a smaller vessel should avoid navigating in hazardous conditions.
Monday, June 29, 2026

Weather Forecast

Patchy rain nearby
65.6°F
58.3°F
62°F
88%
0.02 in
49%
0%
14.1 mph
2.4


Air Quality

AQI: 1 - Good
PM2.5: 3.08 μg/m3
PM10: 3.2 μg/m3
Carbon Monoxide: 121.25 μg/m3
Nitrogen Dioxide: 0.89 μg/m3
Sulphur Dioxide: 0.37 μg/m3
Ozone: 94.17 μg/m3

Astronomical

Sunrise: 5:06 AM
Sun Transit: 1:04 PM
Sunset: 9:04 PM
Daylight: 15 hrs 58 mins
Moonrise: 9:29 PM
Moon Transit: 12:27 AM
Moonset: 4:12 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:20 AM - 2:50 PM

Minor Periods

8:59 PM - 10:29 PM
3:42 AM - 5:12 AM

Action Rating: 5 out of 5

Tuesday, June 30, 2026

Weather Forecast

Fog
72.9°F
57.7°F
64.3°F
87%
0.01 in
41%
0%
9.8 mph
7.7


Air Quality

AQI: 1 - Good
PM2.5: 3.3 μg/m3
PM10: 3.8 μg/m3
Carbon Monoxide: 117.79 μg/m3
Nitrogen Dioxide: 1.26 μg/m3
Sulphur Dioxide: 0.28 μg/m3
Ozone: 91.63 μg/m3

Astronomical

Sunrise: 5:06 AM
Sun Transit: 1:05 PM
Sunset: 9:03 PM
Daylight: 15 hrs 57 mins
Moonrise: 10:05 PM
Moon Transit: 1:19 AM
Moonset: 5:12 AM
Moon Phase: Full
Moon Illumination: 98.6%

Best Times for Fishing or Hunting

Major Periods

12:49 AM - 3:19 AM
1:11 PM - 3:41 PM

Minor Periods

9:35 PM - 11:05 PM
4:42 AM - 6:12 AM

Action Rating: 4 out of 5

Wednesday, July 1, 2026

Weather Forecast

Sunny
67.7°F
56.2°F
60.3°F
85%
0.53 in
82%
0%
9.2 mph
7.6


Air Quality

AQI: 1 - Good
PM2.5: 5.26 μg/m3
PM10: 6.8 μg/m3
Carbon Monoxide: 115.25 μg/m3
Nitrogen Dioxide: 1.25 μg/m3
Sulphur Dioxide: 0.25 μg/m3
Ozone: 80.63 μg/m3

Astronomical

Sunrise: 5:07 AM
Sun Transit: 1:05 PM
Sunset: 9:03 PM
Daylight: 15 hrs 56 mins
Moonrise: 10:32 PM
Moon Transit: 2:08 AM
Moonset: 6:20 AM
Moon Phase: Full
Moon Illumination: 94.7%

Best Times for Fishing or Hunting

Major Periods

1:38 AM - 4:08 AM
2:00 PM - 4:30 PM

Minor Periods

10:02 PM - 11:32 PM
5:50 AM - 7:20 AM

Action Rating: 3 out of 5

Thursday, July 2, 2026

Weather Forecast

Fog
68.3°F
54.4°F
61°F
89%
0.01 in
49%
0%
6.9 mph
6.1


Air Quality

AQI: 1 - Good
PM2.5: 0.82 μg/m3
PM10: 0.92 μg/m3
Carbon Monoxide: 166.75 μg/m3
Nitrogen Dioxide: 1.6 μg/m3
Sulphur Dioxide: 0.29 μg/m3
Ozone: 88.8 μg/m3

Astronomical

Sunrise: 5:08 AM
Sun Transit: 1:05 PM
Sunset: 9:03 PM
Daylight: 15 hrs 55 mins
Moonrise: 10:54 PM
Moon Transit: 2:56 AM
Moonset: 7:29 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.5%

Best Times for Fishing or Hunting

Major Periods

2:26 AM - 4:56 AM
2:46 PM - 5:16 PM

Minor Periods

10:24 PM - 11:54 PM
6:59 AM - 8:29 AM

Action Rating: 3 out of 5

Friday, July 3, 2026

Weather Forecast

Patchy rain nearby
62.6°F
54.3°F
59.2°F
92%
0.01 in
45%
0%
7.8 mph
4


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 5:08 AM
Sun Transit: 1:05 PM
Sunset: 9:03 PM
Daylight: 15 hrs 54 mins
Moonrise: 11:12 PM
Moon Transit: 3:41 AM
Moonset: 8:41 AM
Moon Phase: Waning Gibbous
Moon Illumination: 80.3%

Best Times for Fishing or Hunting

Major Periods

3:11 AM - 5:41 AM
3:31 PM - 6:01 PM

Minor Periods

12:00 AM - 12:00 AM
8:11 AM - 9:41 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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