Water Temperature of Grand Marais Harbor in Grand Marais, MN

Current Water Temperature

42.3°F

Measurement Time: Sunday, May 17, 2026, 10:18 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

42.1°F
Sunny
Sunny
33.8°F
45°F
64%
E 17.4 mph
20.1 mph
37.4°F
33.5°F
0 in
0%
6 mi
1018 mbar
4.6

Five Day Weather Forecast

Sunny
Sun
H: 49°F
L: 39°F
Moderate rain
Mon
H: 52°F
L: 42°F
Patchy rain nearby
Tue
H: 45°F
L: 37°F
Sunny
Wed
H: 47°F
L: 31°F
Sunny
Thu
H: 50°F
L: 35°F

Air Quality

AQI: 1 - Good
PM2.5: 0.98 μg/m3
PM10: 1.08 μg/m3
Carbon Monoxide: 117.68 μg/m3
Nitrogen Dioxide: 1.08 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 66 μg/m3

Astronomical

Sunrise: 5:21 AM
Sun Transit: 12:57 AM
Sunset: 8:36 PM
Daylight: 15 hrs 15 mins
Moonrise: 5:20 AM
Moon Transit: 1:51 PM
Moonset: 10:34 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:45 AM - 3:15 AM
1:21 PM - 3:51 PM

Minor Periods

10:04 PM - 11:34 PM
4:50 AM - 6:20 AM

Action Rating: 3 out of 5

Sunday, May 17, 2026

Weather Forecast

Sunny
48.9°F
39°F
43.3°F
61%
0 in
0%
0%
18.1 mph
6.1


Air Quality

AQI: 1 - Good
PM2.5: 0.85 μg/m3
PM10: 0.86 μg/m3
Carbon Monoxide: 117.92 μg/m3
Nitrogen Dioxide: 1.18 μg/m3
Sulphur Dioxide: 0.79 μg/m3
Ozone: 62.64 μg/m3

Astronomical

Sunrise: 5:21 AM
Sun Transit: 12:57 AM
Sunset: 8:36 PM
Daylight: 15 hrs 15 mins
Moonrise: 5:20 AM
Moon Transit: 1:51 PM
Moonset: 10:34 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:45 AM - 3:15 AM
1:21 PM - 3:51 PM

Minor Periods

10:04 PM - 11:34 PM
4:50 AM - 6:20 AM

Action Rating: 3 out of 5

Monday, May 18, 2026

Weather Forecast

Moderate rain
51.7°F
42.3°F
46.8°F
94%
0.32 in
92%
0%
15.7 mph
5.9


Air Quality

AQI: 1 - Good
PM2.5: 1.5 μg/m3
PM10: 1.61 μg/m3
Carbon Monoxide: 123.08 μg/m3
Nitrogen Dioxide: 1.31 μg/m3
Sulphur Dioxide: 0.87 μg/m3
Ozone: 65 μg/m3

Astronomical

Sunrise: 5:19 AM
Sun Transit: 12:57 AM
Sunset: 8:37 PM
Daylight: 15 hrs 18 mins
Moonrise: 6:14 AM
Moon Transit: 2:58 PM
Moonset: 11:43 PM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

1:52 AM - 4:22 AM
2:28 PM - 4:58 PM

Minor Periods

12:00 AM - 12:00 AM
5:44 AM - 7:14 AM

Action Rating: 4 out of 5

Tuesday, May 19, 2026

Weather Forecast

Patchy rain nearby
45.1°F
37.3°F
43.1°F
86%
0.07 in
89%
0%
14.1 mph
1.9


Air Quality

AQI: 1 - Good
PM2.5: 0.78 μg/m3
PM10: 0.8 μg/m3
Carbon Monoxide: 120.28 μg/m3
Nitrogen Dioxide: 1.22 μg/m3
Sulphur Dioxide: 0.83 μg/m3
Ozone: 67.76 μg/m3

Astronomical

Sunrise: 5:18 AM
Sun Transit: 12:57 AM
Sunset: 8:38 PM
Daylight: 15 hrs 20 mins
Moonrise: 7:23 AM
Moon Transit: 4:04 PM
Moonset: 12:43 AM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

2:59 AM - 5:29 AM
3:34 PM - 6:04 PM

Minor Periods

6:53 AM - 8:23 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Wednesday, May 20, 2026

Weather Forecast

Sunny
46.5°F
30.6°F
39.4°F
71%
0 in
0%
0%
11.6 mph
6.3


Air Quality

AQI: 1 - Good
PM2.5: 1.13 μg/m3
PM10: 1.34 μg/m3
Carbon Monoxide: 117.3 μg/m3
Nitrogen Dioxide: 1.13 μg/m3
Sulphur Dioxide: 0.8 μg/m3
Ozone: 75.36 μg/m3

Astronomical

Sunrise: 5:17 AM
Sun Transit: 12:57 AM
Sunset: 8:39 PM
Daylight: 15 hrs 22 mins
Moonrise: 8:44 AM
Moon Transit: 5:06 PM
Moonset: 12:35 AM
Moon Phase: Waxing Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

4:03 AM - 6:33 AM
4:36 PM - 7:06 PM

Minor Periods

8:14 AM - 9:44 AM
12:05 AM - 1:35 AM

Action Rating: 2 out of 5

Thursday, May 21, 2026

Weather Forecast

Sunny
49.8°F
34.9°F
42.5°F
71%
0 in
0%
0%
6.7 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 2.46 μg/m3
PM10: 2.92 μg/m3
Carbon Monoxide: 134.96 μg/m3
Nitrogen Dioxide: 2.48 μg/m3
Sulphur Dioxide: 0.96 μg/m3
Ozone: 68.15 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

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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