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

55°F
Partly Cloudy
Partly Cloudy
51.7°F
67.3°F
100%
WSW 12.1 mph
25.4 mph
67.3°F
60.8°F
0 in
0%
6 mi
1017 mbar
5

Five Day Weather Forecast

Partly Cloudy
Mon
H: 76°F
L: 66°F
Sunny
Tue
H: 82°F
L: 69°F
Sunny
Wed
H: 74°F
L: 61°F
Sunny
Thu
H: 68°F
L: 55°F
Sunny
Fri
H: 66°F
L: 55°F

Air Quality

AQI: 1 - Good
PM2.5: 3.8 μg/m3
PM10: 3.9 μg/m3
Carbon Monoxide: 116 μg/m3
Nitrogen Dioxide: 1.4 μg/m3
Sulphur Dioxide: 0.2 μg/m3
Ozone: 82 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

Small Craft Advisory issued July 13 at 12:20AM CDT until July 14 at 6:00AM CDT by NWS Duluth MN

Effective: Mon July 13, 2026, 12:20 AM
Expires: Mon July 13, 2026, 12:30 PM

* WHAT...Southwest winds 10 to 20 kt with gusts up to 30 kt and waves 2 to 5 ft expected. * WHERE...Grand Portage to Grand Marais MN. * WHEN...From 11 AM this morning to 6 AM CDT Tuesday. * IMPACTS...Conditions will be hazardous to small craft. * ADDITIONAL DETAILS...Occasional gusts near gale force are possible between Grand Portage and Isle Royale late this afternoon into the early evening.

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


Small Craft Advisory issued July 13 at 12:20AM CDT until July 13 at 9:00PM CDT by NWS Duluth MN

Effective: Mon July 13, 2026, 12:20 AM
Expires: Mon July 13, 2026, 12:30 PM

* WHAT...Waves 1 to 3 ft expected. * WHERE...Grand Marais to Taconite Harbor MN, Taconite Harbor to Silver Bay Harbor MN and Silver Bay Harbor to Two Harbors MN. * WHEN...From 1 PM this afternoon to 9 PM CDT this evening. * IMPACTS...Conditions will be hazardous to small craft.

Anyone operating a smaller vessel should avoid navigating in hazardous conditions.
Monday, July 13, 2026

Weather Forecast

Partly Cloudy
76.1°F
66°F
70.6°F
70%
0 in
8%
0%
14.5 mph
8.8


Air Quality

AQI: 1 - Good
PM2.5: 4.38 μg/m3
PM10: 4.63 μg/m3
Carbon Monoxide: 113.88 μg/m3
Nitrogen Dioxide: 0.81 μg/m3
Sulphur Dioxide: 0.21 μg/m3
Ozone: 94.58 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
81.9°F
69.3°F
74.2°F
48%
0 in
2%
0%
11.6 mph
8.9


Air Quality

AQI: 1 - Good
PM2.5: 4.72 μg/m3
PM10: 4.93 μg/m3
Carbon Monoxide: 113.08 μg/m3
Nitrogen Dioxide: 0.91 μg/m3
Sulphur Dioxide: 0.29 μg/m3
Ozone: 92.58 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

Wednesday, July 15, 2026

Weather Forecast

Sunny
74.1°F
60.7°F
67.4°F
51%
0 in
17%
0%
9.4 mph
7.9


Air Quality

AQI: 1 - Good
PM2.5: 3.89 μg/m3
PM10: 4 μg/m3
Carbon Monoxide: 103.5 μg/m3
Nitrogen Dioxide: 1.38 μg/m3
Sulphur Dioxide: 0.26 μg/m3
Ozone: 72.46 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

Sunny
68.3°F
54.7°F
62.3°F
69%
0.01 in
36%
0%
8.7 mph
7.7


Air Quality

AQI: 1 - Good
PM2.5: 6.83 μg/m3
PM10: 6.95 μg/m3
Carbon Monoxide: 131.77 μg/m3
Nitrogen Dioxide: 1.19 μg/m3
Sulphur Dioxide: 0.44 μg/m3
Ozone: 73.21 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

Sunny
65.7°F
54.6°F
59°F
75%
0.59 in
72%
0%
10.7 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 7.01 μg/m3
PM10: 7.31 μg/m3
Carbon Monoxide: 146.63 μg/m3
Nitrogen Dioxide: 0.98 μg/m3
Sulphur Dioxide: 0.44 μg/m3
Ozone: 70 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

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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