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

45°F
Clear
Clear
43.8°F
60.4°F
93%
WNW 3.1 mph
6.6 mph
60.4°F
55.3°F
0 in
0%
6 mi
1010 mbar
0

Five Day Weather Forecast

Sunny
Thu
H: 71°F
L: 60°F
Sunny
Fri
H: 61°F
L: 52°F
Sunny
Sat
H: 63°F
L: 53°F
Sunny
Sun
H: 62°F
L: 51°F
Sunny
Mon
H: 69°F
L: 52°F

Air Quality

AQI: 1 - Good
PM2.5: 12 μg/m3
PM10: 13.6 μg/m3
Carbon Monoxide: 113 μg/m3
Nitrogen Dioxide: 2.1 μg/m3
Sulphur Dioxide: 0.6 μg/m3
Ozone: 84 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

Small Craft Advisory issued July 2 at 12:08AM CDT until July 2 at 4:00PM CDT by NWS Duluth MN

Effective: Thu July 2, 2026, 12:08 AM
Expires: Thu July 2, 2026, 12:15 PM

* WHAT...Southwest winds 10 to 15 kt with gusts up to 25 kt and waves 2 to 4 ft expected. * WHERE...Grand Portage to Grand Marais MN. * WHEN...From 10 AM this morning to 4 PM CDT this afternoon. * IMPACTS...Conditions will be hazardous to small craft.

Anyone operating a smaller vessel should avoid navigating in hazardous conditions.
Thursday, July 2, 2026

Weather Forecast

Sunny
70.9°F
59.5°F
64.6°F
77%
0 in
10%
0%
11.9 mph
7.9


Air Quality

AQI: 1 - Good
PM2.5: 10.17 μg/m3
PM10: 10.97 μg/m3
Carbon Monoxide: 156.13 μg/m3
Nitrogen Dioxide: 1.45 μg/m3
Sulphur Dioxide: 0.36 μg/m3
Ozone: 83.42 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

Sunny
61.4°F
52°F
57.3°F
80%
0.01 in
22%
0%
9.6 mph
6.3


Air Quality

AQI: 1 - Good
PM2.5: 3.29 μg/m3
PM10: 3.38 μg/m3
Carbon Monoxide: 121.67 μg/m3
Nitrogen Dioxide: 1.04 μg/m3
Sulphur Dioxide: 0.26 μg/m3
Ozone: 70.17 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

Saturday, July 4, 2026

Weather Forecast

Sunny
62.5°F
53.1°F
57.8°F
76%
0 in
9%
0%
10.7 mph
7.8


Air Quality

AQI: 1 - Good
PM2.5: 2.88 μg/m3
PM10: 2.95 μg/m3
Carbon Monoxide: 133.46 μg/m3
Nitrogen Dioxide: 0.75 μg/m3
Sulphur Dioxide: 0.28 μg/m3
Ozone: 67.5 μg/m3

Astronomical

Sunrise: 5:09 AM
Sun Transit: 1:05 PM
Sunset: 9:02 PM
Daylight: 15 hrs 53 mins
Moonrise: 12:12 AM
Moon Transit: 4:25 AM
Moonset: 9:51 AM
Moon Phase: Waning Gibbous
Moon Illumination: 70.6%

Best Times for Fishing or Hunting

Major Periods

3:55 AM - 6:25 AM
4:14 PM - 6:44 PM

Minor Periods

9:21 AM - 10:51 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Sunday, July 5, 2026

Weather Forecast

Sunny
62.3°F
51°F
57.1°F
73%
0 in
7%
0%
7.8 mph
7.8


Air Quality

AQI: 1 - Good
PM2.5: 9.97 μg/m3
PM10: 10.65 μg/m3
Carbon Monoxide: 111.14 μg/m3
Nitrogen Dioxide: 1.18 μg/m3
Sulphur Dioxide: 0.6 μg/m3
Ozone: 68.38 μg/m3

Astronomical

Sunrise: 5:10 AM
Sun Transit: 1:06 PM
Sunset: 9:02 PM
Daylight: 15 hrs 52 mins
Moonrise: 12:27 AM
Moon Transit: 5:08 AM
Moonset: 11:02 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.8%

Best Times for Fishing or Hunting

Major Periods

4:38 AM - 7:08 AM
4:56 PM - 7:26 PM

Minor Periods

10:32 AM - 12:02 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Monday, July 6, 2026

Weather Forecast

Sunny
69.1°F
51.5°F
61.6°F
68%
0 in
7%
0%
10.1 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 9.84 μg/m3
PM10: 10.8 μg/m3
Carbon Monoxide: 133.25 μg/m3
Nitrogen Dioxide: 1.23 μg/m3
Sulphur Dioxide: 0.24 μg/m3
Ozone: 59.75 μg/m3

Astronomical

Sunrise: 5:10 AM
Sun Transit: 1:06 PM
Sunset: 9:01 PM
Daylight: 15 hrs 51 mins
Moonrise: 12:43 AM
Moon Transit: 5:51 AM
Moonset: 12:14 AM
Moon Phase: Last Quarter
Moon Illumination: 48.6%

Best Times for Fishing or Hunting

Major Periods

5:21 AM - 7:51 AM
11:45 AM - 2:15 PM

Minor Periods

11:44 AM - 1:14 PM
12:00 AM - 12:00 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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