Water Temperature of Grand Marais Harbor in Grand Marais, MN

Current Water Temperature

44.2°F

Measurement Time: Monday, June 8, 2026, 2:18 AM 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

54°F
Patchy rain nearby
Patchy rain nearby
52.3°F
61.7°F
97%
WSW 6 mph
12.7 mph
61.7°F
57.6°F
0 in
0%
0 mi
1018 mbar
0.1

Five Day Weather Forecast

Partly Cloudy
Sun
H: 77°F
L: 60°F
Sunny
Mon
H: 82°F
L: 65°F
Sunny
Tue
H: 80°F
L: 68°F
Sunny
Wed
H: 69°F
L: 60°F
Sunny
Thu
H: 66°F
L: 58°F

Air Quality

AQI: 1 - Good
PM2.5: 5.7 μg/m3
PM10: 6.3 μg/m3
Carbon Monoxide: 119 μg/m3
Nitrogen Dioxide: 1.9 μg/m3
Sulphur Dioxide: 0.5 μg/m3
Ozone: 87 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 1:07 PM
Sunset: 8:58 PM
Daylight: 15 hrs 42 mins
Moonrise: 2:36 AM
Moon Transit: 11:20 AM
Moonset: 8:05 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:50 AM - 1:20 PM

Minor Periods

7:35 PM - 9:05 PM
2:06 AM - 3:36 AM

Action Rating: 3 out of 5

Small Craft Advisory issued July 11 at 11:52PM CDT until July 12 at 10:00PM CDT by NWS Duluth MN

Effective: Sat July 11, 2026, 11:52 PM
Expires: Sun July 12, 2026, 12:00 PM

* WHAT...Southwest winds 15 to 20 kt with gusts up to 25 kt and waves 3 to 5 ft expected. * WHERE...Grand Portage to Grand Marais MN. * WHEN...From 10 AM to 10 PM CDT Sunday. * IMPACTS...Conditions will be hazardous to small craft.

Anyone operating a smaller vessel should avoid navigating in hazardous conditions.
Sunday, July 12, 2026

Weather Forecast

Partly Cloudy
76.8°F
60.1°F
67.6°F
77%
0 in
14%
0%
15.4 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 6.39 μg/m3
PM10: 7.16 μg/m3
Carbon Monoxide: 121.42 μg/m3
Nitrogen Dioxide: 1.19 μg/m3
Sulphur Dioxide: 0.41 μg/m3
Ozone: 105.29 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 1:07 PM
Sunset: 8:58 PM
Daylight: 15 hrs 42 mins
Moonrise: 2:36 AM
Moon Transit: 11:20 AM
Moonset: 8:05 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:50 AM - 1:20 PM

Minor Periods

7:35 PM - 9:05 PM
2:06 AM - 3:36 AM

Action Rating: 3 out of 5

Monday, July 13, 2026

Weather Forecast

Sunny
81.7°F
65°F
73.2°F
63%
0 in
5%
0%
10.7 mph
8.9


Air Quality

AQI: 1 - Good
PM2.5: 4.71 μg/m3
PM10: 5.03 μg/m3
Carbon Monoxide: 113.29 μg/m3
Nitrogen Dioxide: 0.74 μg/m3
Sulphur Dioxide: 0.24 μg/m3
Ozone: 96.25 μg/m3

Astronomical

Sunrise: 5:17 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
80.3°F
68.2°F
73.9°F
56%
0 in
3%
0%
10.1 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 4.35 μg/m3
PM10: 4.54 μg/m3
Carbon Monoxide: 110.5 μg/m3
Nitrogen Dioxide: 0.84 μg/m3
Sulphur Dioxide: 0.26 μg/m3
Ozone: 94.83 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
69.1°F
60.4°F
66°F
51%
0 in
3%
0%
7.2 mph
3.8


Air Quality

AQI: 1 - Good
PM2.5: 3.25 μg/m3
PM10: 3.29 μg/m3
Carbon Monoxide: 120.1 μg/m3
Nitrogen Dioxide: 1.27 μg/m3
Sulphur Dioxide: 0.21 μg/m3
Ozone: 74.63 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
66°F
57.9°F
62°F
61%
0 in
8%
0%
10.5 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 5.83 μg/m3
PM10: 5.88 μg/m3
Carbon Monoxide: 189.13 μg/m3
Nitrogen Dioxide: 1.03 μg/m3
Sulphur Dioxide: 0.2 μg/m3
Ozone: 70.75 μg/m3

Astronomical

Sunrise: 5:20 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

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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