Water Temperature of Grand Marais Harbor in Grand Marais, MN

Current Water Temperature

48.7°F

Measurement Time: Tuesday, July 28, 2026, 6:00 PM CDT

Temperature Locations

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Local Points of Interest

Lake Superior; Grand Marais Campground and Marina; Grand Marais Municipal Arena

Grand Marais Harbor

Station Name: 9099090 - Grand Marais, MN
Station Type: Fixed
Data Source: National Data Buoy Center

Elevation Above Sea Level: 617 feet

Nearest Address:
391 MN-61
Grand Marais, MN 55604
Cook County

GPS Coordinates: 47.749, -90.341

Nearby Water Temperatures

Lake Superior, Grand Marais, MN (0.6 mi)
Poplar River, Lutsen, MN (18.8 mi)
Grand Portage River, Grand Portage, MN (33.9 mi)
Lake Superior, Lake Superior, MI (38.4 mi)
Baptism River, Illgen City, MN (49.1 mi)
Kawishiwi River, Ely, MN (56.7 mi)
Washington Creek, Windigo, MI (56.7 mi)
Dunka River, Babbitt, MN (70.8 mi)
Dunka River, Babbitt, MN (71.1 mi)
Partrige River, Babbitt, MN (74.2 mi)
Lake Superior, Two Harbors, MN (79.9 mi)
Saint Louis River, Hoyt Lakes, MN (81.3 mi)
Chequamegon Bay, Ashland, WI (81.3 mi)
Presque Isle River, Tula, MI (87.2 mi)
Lake Superior, Calumet, MI (87.4 mi)

Weather for Grand Marais, Minnesota

Current Weather

59.7°F
Clear
Clear
52.3°F
59.7°F
68%
WSW 2.2 mph
6.7 mph
59.7°F
49.2°F
0 in
2%
6 mi
1013 mbar
0

Five Day Weather Forecast

Sunny
Tue
H: 63°F
L: 59°F
Sunny
Wed
H: 70°F
L: 60°F
Sunny
Thu
H: 72°F
L: 58°F
Patchy rain nearby
Fri
H: 67°F
L: 59°F
Sunny
Sat
H: 65°F
L: 56°F

Air Quality

AQI: 1 - Good
PM2.5: 13.9 μg/m3
PM10: 14.2 μg/m3
Carbon Monoxide: 127 μg/m3
Nitrogen Dioxide: 2.7 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 66 μg/m3

Astronomical

Sunrise: 5:33 AM
Sun Transit: 1:07 PM
Sunset: 8:42 PM
Daylight: 15 hrs 8 mins
Moonrise: 8:36 PM
Moon Transit: 12:04 AM
Moonset: 4:09 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:56 AM - 2:26 PM

Minor Periods

8:06 PM - 9:36 PM
3:39 AM - 5:09 AM

Action Rating: 4 out of 5

Dense Fog Advisory issued July 28 at 6:03PM CDT until July 29 at 10:00AM CDT by NWS Duluth MN

Effective: Tue July 28, 2026, 6:03 PM
Expires: Wed July 29, 2026, 10:00 AM

* WHAT...Dense fog will reduce visibility to less than 1 NM. * WHERE...Portions of Lake Superior. * WHEN...Until 10 AM CDT Wednesday. * 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 Fog Advisory issued July 28 at 9:58AM EDT until July 28 at 8:00PM EDT by NWS Marquette MI

Effective: Tue July 28, 2026, 8:58 AM
Expires: Tue July 28, 2026, 7:00 PM

* WHAT...Dense fog will reduce visibility to less than one nautical mile. * WHERE...Portions of Western Lake Superior. * WHEN...Until 8 PM EDT /7 PM CDT/ this evening. * 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.
Tuesday, July 28, 2026

Weather Forecast

Sunny
63.3°F
58.6°F
60.8°F
74%
0 in
8%
0%
6.5 mph
6.9


Air Quality

AQI: 2 - Moderate
PM2.5: 19.55 μg/m3
PM10: 20.17 μg/m3
Carbon Monoxide: 118.13 μg/m3
Nitrogen Dioxide: 1.69 μg/m3
Sulphur Dioxide: 0.43 μg/m3
Ozone: 63.42 μg/m3

Astronomical

Sunrise: 5:33 AM
Sun Transit: 1:07 PM
Sunset: 8:42 PM
Daylight: 15 hrs 8 mins
Moonrise: 8:36 PM
Moon Transit: 12:04 AM
Moonset: 4:09 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:56 AM - 2:26 PM

Minor Periods

8:06 PM - 9:36 PM
3:39 AM - 5:09 AM

Action Rating: 4 out of 5

Wednesday, July 29, 2026

Weather Forecast

Sunny
70°F
59.7°F
63.6°F
72%
0 in
7%
0%
7.4 mph
6.8


Air Quality

AQI: 1 - Good
PM2.5: 12.45 μg/m3
PM10: 12.9 μg/m3
Carbon Monoxide: 123.46 μg/m3
Nitrogen Dioxide: 1.83 μg/m3
Sulphur Dioxide: 0.41 μg/m3
Ozone: 79.21 μg/m3

Astronomical

Sunrise: 5:35 AM
Sun Transit: 1:07 PM
Sunset: 8:40 PM
Daylight: 15 hrs 6 mins
Moonrise: 8:59 PM
Moon Transit: 12:53 AM
Moonset: 5:19 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:23 AM - 2:53 AM
12:44 AM - 3:14 PM

Minor Periods

8:29 PM - 9:59 PM
4:49 AM - 6:19 AM

Action Rating: 4 out of 5

Thursday, July 30, 2026

Weather Forecast

Sunny
71.6°F
57.8°F
62.7°F
86%
0.81 in
79%
0%
13 mph
4.1


Air Quality

AQI: 1 - Good
PM2.5: 12.21 μg/m3
PM10: 12.78 μg/m3
Carbon Monoxide: 134.79 μg/m3
Nitrogen Dioxide: 1.51 μg/m3
Sulphur Dioxide: 0.41 μg/m3
Ozone: 84.92 μg/m3

Astronomical

Sunrise: 5:36 AM
Sun Transit: 1:07 PM
Sunset: 8:39 PM
Daylight: 15 hrs 3 mins
Moonrise: 9:18 PM
Moon Transit: 1:39 AM
Moonset: 6:31 AM
Moon Phase: Full
Moon Illumination: 97.1%

Best Times for Fishing or Hunting

Major Periods

1:09 AM - 3:39 AM
1:30 PM - 4:00 PM

Minor Periods

8:48 PM - 10:18 PM
6:01 AM - 7:31 AM

Action Rating: 5 out of 5

Friday, July 31, 2026

Weather Forecast

Patchy rain nearby
66.9°F
58.5°F
61.3°F
95%
0.37 in
91%
0%
8.5 mph
4.5


Air Quality

AQI: 1 - Good
PM2.5: 11.1 μg/m3
PM10: 11.5 μg/m3
Carbon Monoxide: 131.83 μg/m3
Nitrogen Dioxide: 1.73 μg/m3
Sulphur Dioxide: 0.28 μg/m3
Ozone: 75 μg/m3

Astronomical

Sunrise: 5:37 AM
Sun Transit: 1:07 PM
Sunset: 8:38 PM
Daylight: 15 hrs 1 mins
Moonrise: 9:35 PM
Moon Transit: 2:24 AM
Moonset: 7:42 AM
Moon Phase: Full
Moon Illumination: 92.0%

Best Times for Fishing or Hunting

Major Periods

1:54 AM - 4:24 AM
2:13 PM - 4:43 PM

Minor Periods

9:05 PM - 10:35 PM
7:12 AM - 8:42 AM

Action Rating: 4 out of 5

Saturday, August 1, 2026

Weather Forecast

Sunny
65.2°F
55.6°F
60.1°F
82%
0 in
18%
0%
8.5 mph
6.7


Air Quality

AQI: 1 - Good
PM2.5: 2.45 μg/m3
PM10: 2.48 μg/m3
Carbon Monoxide: 115.83 μg/m3
Nitrogen Dioxide: 1.15 μg/m3
Sulphur Dioxide: 0.33 μg/m3
Ozone: 65.79 μg/m3

Astronomical

Sunrise: 5:38 AM
Sun Transit: 1:07 PM
Sunset: 8:36 PM
Daylight: 14 hrs 58 mins
Moonrise: 9:50 PM
Moon Transit: 3:07 AM
Moonset: 8:53 AM
Moon Phase: Waning Gibbous
Moon Illumination: 84.9%

Best Times for Fishing or Hunting

Major Periods

2:37 AM - 5:07 AM
2:56 PM - 5:26 PM

Minor Periods

9:20 PM - 10:50 PM
8:23 AM - 9:53 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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