Water Temperature of Grand Marais Harbor in Grand Marais, MN

Current Water Temperature

53.1°F

Measurement Time: Sunday, October 11, 2026, 10:18 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

51.5°F

Conditions: Overcast
Humidity: 86%
Feels Like: 47.3°F
Wind: NE 9.2 mph
Wind Gusts: 17.7 mph

Pressure: 29.84 in
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 6 mi
UV Index: 0

Weather Forecast

Mon
H: 52°F
L: 45°F

Tue
H: 50°F
L: 45°F

Wed
H: 51°F
L: 43°F

Thu
H: 48°F
L: 42°F

Fri
H: 44°F
L: 32°F

Air Quality

AQI: 1 - Good

PM2.5: 1.5 μg/m3

PM10: 1.5 μg/m3

Carbon Monoxide: 110 μg/m3
Nitrogen Dioxide: 0.7 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 57 μg/m3

Astronomical

Sunrise: 7:16 AM
Sun Transit: 12:47 AM
Sunset: 6:19 PM
Daylight: 11 hrs 3 mins

Moonrise: 9:46 AM
Moon Transit: 2:18 PM
Moonset: 6:42 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

1:21 AM - 3:51 AM
1:48 PM - 4:18 PM

Minor Periods

6:12 PM - 7:42 PM
9:16 AM - 10:46 AM

Action Rating: 4 out of 5

Monday, October 12, 2026

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 47°F
Average Humidity: 88%

Chance of Rain: 83%
Wind: 21.7 mph
UV Index: 1.3

Air Quality

AQI: 1 - Good

PM2.5: 0.23 μg/m3

PM10: 0.24 μg/m3

Carbon Monoxide: 106.54 μg/m3
Nitrogen Dioxide: 0.45 μg/m3
Sulphur Dioxide: 0.2 μg/m3
Ozone: 67.13 μg/m3

Astronomical

Sunrise: 7:16 AM
Sun Transit: 12:47 AM
Sunset: 6:19 PM
Daylight: 11 hrs 3 mins

Moonrise: 9:46 AM
Moon Transit: 2:18 PM
Moonset: 6:42 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

1:21 AM - 3:51 AM
1:48 PM - 4:18 PM

Minor Periods

6:12 PM - 7:42 PM
9:16 AM - 10:46 AM

Action Rating: 4 out of 5

Tuesday, October 13, 2026

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 47.4°F
Average Humidity: 88%

Chance of Rain: 84%
Wind: 15.9 mph
UV Index: 1.3

Air Quality

AQI: 1 - Good

PM2.5: 0.13 μg/m3

PM10: 0.16 μg/m3

Carbon Monoxide: 105.54 μg/m3
Nitrogen Dioxide: 0.48 μg/m3
Sulphur Dioxide: 0.25 μg/m3
Ozone: 65.67 μg/m3

Astronomical

Sunrise: 7:17 AM
Sun Transit: 12:47 AM
Sunset: 6:17 PM
Daylight: 10 hrs 59 mins

Moonrise: 10:58 AM
Moon Transit: 3:07 PM
Moonset: 7:11 PM
Moon Phase: New
Moon Illumination: 4.0%

Best Times for Fishing or Hunting

Major Periods

2:10 AM - 4:40 AM
2:37 PM - 5:07 PM

Minor Periods

6:41 PM - 8:11 PM
10:28 AM - 11:58 AM

Action Rating: 4 out of 5

Wednesday, October 14, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 47.6°F
Average Humidity: 69%

Chance of Rain: 13%
Wind: 10.1 mph
UV Index: 2.4

Air Quality

AQI: 1 - Good

PM2.5: 0.4 μg/m3

PM10: 0.43 μg/m3

Carbon Monoxide: 110.17 μg/m3
Nitrogen Dioxide: 0.47 μg/m3
Sulphur Dioxide: 0.19 μg/m3
Ozone: 67.21 μg/m3

Astronomical

Sunrise: 7:19 AM
Sun Transit: 12:47 AM
Sunset: 6:15 PM
Daylight: 10 hrs 56 mins

Moonrise: 12:05 AM
Moon Transit: 3:58 PM
Moonset: 7:48 PM
Moon Phase: Waxing Crescent
Moon Illumination: 9.6%

Best Times for Fishing or Hunting

Major Periods

2:59 AM - 5:29 AM
3:28 PM - 5:58 PM

Minor Periods

7:18 PM - 8:48 PM
11:35 AM - 1:05 PM

Action Rating: 3 out of 5

Thursday, October 15, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 45.2°F
Average Humidity: 77%

Chance of Rain: 74%
Wind: 17.9 mph
UV Index: 2.3

Air Quality

AQI: 1 - Good

PM2.5: 1.29 μg/m3

PM10: 1.4 μg/m3

Carbon Monoxide: 120.72 μg/m3
Nitrogen Dioxide: 0.8 μg/m3
Sulphur Dioxide: 0.35 μg/m3
Ozone: 70.96 μg/m3

Astronomical

Sunrise: 7:20 AM
Sun Transit: 12:47 AM
Sunset: 6:13 PM
Daylight: 10 hrs 53 mins

Moonrise: 1:05 PM
Moon Transit: 4:49 PM
Moonset: 8:34 PM
Moon Phase: Waxing Crescent
Moon Illumination: 17.2%

Best Times for Fishing or Hunting

Major Periods

3:51 AM - 6:21 AM
4:19 PM - 6:49 PM

Minor Periods

8:04 PM - 9:34 PM
12:35 AM - 2:05 PM

Action Rating: 2 out of 5

Friday, October 16, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 38.6°F
Average Humidity: 66%

Chance of Rain: 41%
Wind: 31.5 mph
UV Index: 2

Air Quality

AQI: 1 - Good

PM2.5: 0.15 μg/m3

PM10: 0.15 μg/m3

Carbon Monoxide: 158.38 μg/m3
Nitrogen Dioxide: 0.31 μg/m3
Sulphur Dioxide: 0.28 μg/m3
Ozone: 64.13 μg/m3

Astronomical

Sunrise: 7:22 AM
Sun Transit: 12:46 AM
Sunset: 6:11 PM
Daylight: 10 hrs 49 mins

Moonrise: 1:55 PM
Moon Transit: 5:41 PM
Moonset: 9:29 PM
Moon Phase: Waxing Crescent
Moon Illumination: 26.6%

Best Times for Fishing or Hunting

Major Periods

4:42 AM - 7:12 AM
5:11 PM - 7:41 PM

Minor Periods

8:59 PM - 10:29 PM
1:25 PM - 2:55 PM

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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