Water Temperature of Grand Marais Harbor in Grand Marais, MN

Current Water Temperature

42.4°F

Measurement Time: Thursday, May 21, 2026, 10:18 AM CDT

Temperature Locations

View Nearby Locations     View All Minnesota Locations     View Locations Near Me

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

43°F
Sunny
Sunny
40.9°F
47.1°F
68%
SSE 3.8 mph
6.9 mph
44.3°F
37.4°F
0 in
0%
6 mi
1028 mbar
3

Five Day Weather Forecast

Sunny
Thu
H: 51°F
L: 37°F
Sunny
Fri
H: 53°F
L: 37°F
Moderate rain
Sat
H: 51°F
L: 41°F
Moderate rain
Sun
H: 53°F
L: 44°F
Patchy rain nearby
Mon
H: 58°F
L: 44°F

Air Quality

AQI: 1 - Good
PM2.5: 4.08 μg/m3
PM10: 4.88 μg/m3
Carbon Monoxide: 118.68 μg/m3
Nitrogen Dioxide: 1.58 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 78 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:58 AM
Sunset: 8:41 PM
Daylight: 15 hrs 24 mins
Moonrise: 10:08 AM
Moon Transit: 6:02 PM
Moonset: 1:12 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

5:02 AM - 7:32 AM
5:32 PM - 8:02 PM

Minor Periods

9:38 AM - 11:08 AM
12:42 AM - 2:12 AM

Action Rating: 3 out of 5

Frost Advisory issued May 21 at 11:06AM CDT until May 22 at 7:00AM CDT by NWS Duluth MN

Effective: Thu May 21, 2026, 11:06 AM
Expires: Fri May 22, 2026, 7:00 AM

* WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...In Minnesota, Carlton, South and Central St. Louis, Cook and Lake Counties. In Wisconsin, Douglas County. This includes the Tribal Lands of the Bois Forte Band, Lake Vermilion area, the Fond du Lac Band and the Grand Portage Reservation. This also includes the Boundary Waters eastern and central area. * WHEN...From midnight tonight to 7 AM CDT Friday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.
Thursday, May 21, 2026

Weather Forecast

Sunny
50.7°F
36.7°F
42.6°F
71%
0 in
0%
0%
6.7 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 3.75 μg/m3
PM10: 4.37 μg/m3
Carbon Monoxide: 117.56 μg/m3
Nitrogen Dioxide: 1.77 μg/m3
Sulphur Dioxide: 0.87 μg/m3
Ozone: 71.6 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:58 AM
Sunset: 8:41 PM
Daylight: 15 hrs 24 mins
Moonrise: 10:08 AM
Moon Transit: 6:02 PM
Moonset: 1:12 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

5:02 AM - 7:32 AM
5:32 PM - 8:02 PM

Minor Periods

9:38 AM - 11:08 AM
12:42 AM - 2:12 AM

Action Rating: 3 out of 5

Friday, May 22, 2026

Weather Forecast

Sunny
52.6°F
36.7°F
45.5°F
65%
0 in
0%
0%
14.5 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 4.05 μg/m3
PM10: 4.59 μg/m3
Carbon Monoxide: 118.28 μg/m3
Nitrogen Dioxide: 1.43 μg/m3
Sulphur Dioxide: 0.81 μg/m3
Ozone: 74 μg/m3

Astronomical

Sunrise: 5:15 AM
Sun Transit: 12:58 AM
Sunset: 8:42 PM
Daylight: 15 hrs 27 mins
Moonrise: 11:29 AM
Moon Transit: 6:53 PM
Moonset: 1:39 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

5:55 AM - 8:25 AM
6:23 PM - 8:53 PM

Minor Periods

10:59 AM - 12:29 AM
1:09 AM - 2:39 AM

Action Rating: 3 out of 5

Saturday, May 23, 2026

Weather Forecast

Moderate rain
51.1°F
41.1°F
45.7°F
82%
0.58 in
76%
0%
15.4 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 3.75 μg/m3
PM10: 4.01 μg/m3
Carbon Monoxide: 120.36 μg/m3
Nitrogen Dioxide: 1.64 μg/m3
Sulphur Dioxide: 0.9 μg/m3
Ozone: 77.4 μg/m3

Astronomical

Sunrise: 5:14 AM
Sun Transit: 12:58 AM
Sunset: 8:43 PM
Daylight: 15 hrs 29 mins
Moonrise: 12:47 AM
Moon Transit: 7:39 PM
Moonset: 1:59 AM
Moon Phase: First Quarter
Moon Illumination: 44.4%

Best Times for Fishing or Hunting

Major Periods

6:43 AM - 9:13 AM
7:09 PM - 9:39 PM

Minor Periods

12:17 AM - 1:47 PM
1:29 AM - 2:59 AM

Action Rating: 2 out of 5

Sunday, May 24, 2026

Weather Forecast

Moderate rain
52.5°F
44.2°F
47.4°F
93%
0.21 in
89%
0%
9.6 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 2.82 μg/m3
PM10: 2.85 μg/m3
Carbon Monoxide: 133.62 μg/m3
Nitrogen Dioxide: 2.25 μg/m3
Sulphur Dioxide: 1.01 μg/m3
Ozone: 57.76 μg/m3

Astronomical

Sunrise: 5:13 AM
Sun Transit: 12:58 AM
Sunset: 8:44 PM
Daylight: 15 hrs 31 mins
Moonrise: 2:00 PM
Moon Transit: 8:22 PM
Moonset: 2:16 AM
Moon Phase: First Quarter
Moon Illumination: 55.7%

Best Times for Fishing or Hunting

Major Periods

7:28 AM - 9:58 AM
7:52 PM - 10:22 PM

Minor Periods

1:30 PM - 3:00 PM
1:46 AM - 3:16 AM

Action Rating: 2 out of 5

Monday, May 25, 2026

Weather Forecast

Patchy rain nearby
58°F
44.1°F
50.7°F
86%
0.1 in
86%
0%
5.8 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 2.51 μg/m3
PM10: 2.76 μg/m3
Carbon Monoxide: 138.1 μg/m3
Nitrogen Dioxide: 2.49 μg/m3
Sulphur Dioxide: 0.88 μg/m3
Ozone: 62.85 μg/m3

Astronomical

Sunrise: 5:12 AM
Sun Transit: 12:58 AM
Sunset: 8:45 PM
Daylight: 15 hrs 33 mins
Moonrise: 3:10 PM
Moon Transit: 9:04 PM
Moonset: 2:32 AM
Moon Phase: First Quarter
Moon Illumination: 66.7%

Best Times for Fishing or Hunting

Major Periods

8:10 AM - 10:40 AM
8:34 PM - 11:04 PM

Minor Periods

2:40 PM - 4:10 PM
2:02 AM - 3:32 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.

Webcams Near Grand Marais, MN

Sponsored Content