Water Temperature of Grand Marais Harbor in Grand Marais, MN

Current Water Temperature

54.5°F

Measurement Time: Thursday, September 4, 2025, 6:18 AM CDT

Temperature Locations

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Local Points of Interest

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

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Grand Marais Harbor

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

Elevation Above Sea Level: 617 feet / 188 meters

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

45°F
Overcast
Conditions: Overcast
Humidity: 76%
Feels Like: 38.4°F
Wind: W 14.3 mph
Wind Gusts: 16.5 mph
Pressure: 29.63 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 2.1

Five Day Weather Forecast

Overcast
Thu
H: 55°F
L: 39°F
Overcast
Fri
H: 50°F
L: 43°F
Sunny
Sat
H: 54°F
L: 40°F
Sunny
Sun
H: 59°F
L: 39°F
Sunny
Mon
H: 61°F
L: 45°F

Air Quality

AQI: 1 - Good
PM2.5: 7.05 μg/m3
PM10: 7.55 μg/m3
Carbon Monoxide: 243.34 μg/m3
Nitrogen Dioxide: 0.5 μg/m3
Sulphur Dioxide: 0.17 μg/m3
Ozone: 66 μg/m3

Astronomical

Sunrise: 6:25 AM
Sun Transit: 1:00 PM
Sunset: 7:35 PM
Daylight: 13 hrs 11 mins
Moonrise: 6:32 PM
Moon Transit: 10:55 PM
Moonset: 2:10 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.3%

Best Times for Fishing or Hunting

Major Periods

9:56 AM - 12:26 AM
12:00 AM - 12:00 AM

Minor Periods

6:02 PM - 7:32 PM
1:40 AM - 3:10 AM

Action Rating: 3 out of 5

Frost Advisory issued September 4 at 2:41AM CDT until September 4 at 8:00AM CDT by NWS Duluth MN

Effective: Thu September 4, 2025, 2:41 AM
Expires: Thu September 4, 2025, 8:00 AM

* WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Northern Cook and Lake County. This also includes the Boundary Waters eastern and central area. * WHEN...Until 8 AM CDT this morning. * 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.


Frost Advisory issued September 4 at 2:41AM CDT until September 4 at 8:00AM CDT by NWS Duluth MN

Effective: Thu September 4, 2025, 2:41 AM
Expires: Thu September 4, 2025, 8:00 AM

* WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Southern Cook and Southern Lake Counties. This includes the Tribal Lands of the Grand Portage Reservation. * WHEN...Until 8 AM CDT this morning. * 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.


Frost Advisory issued September 4 at 2:41AM CDT until September 4 at 8:00AM CDT by NWS Duluth MN

Effective: Thu September 4, 2025, 2:41 AM
Expires: Thu September 4, 2025, 8:00 AM

* WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Northern Cook and Lake County. This also includes the Boundary Waters eastern and central area. * WHEN...Until 8 AM CDT this morning. * 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.


Frost Advisory issued September 4 at 2:41AM CDT until September 4 at 8:00AM CDT by NWS Duluth MN

Effective: Thu September 4, 2025, 2:41 AM
Expires: Thu September 4, 2025, 8:00 AM

* WHAT...Temperatures as low as 34 will result in frost formation. * WHERE...Southern Cook and Southern Lake Counties. This includes the Tribal Lands of the Grand Portage Reservation. * WHEN...Until 8 AM CDT this morning. * 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, September 4, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 47.6°F
Average Humidity: 67%
Chance of Rain: 0%
Wind: 15 mph
UV Index: 1.1

Air Quality

AQI: 1 - Good
PM2.5: 4.85 μg/m3
PM10: 5.12 μg/m3
Carbon Monoxide: 235.96 μg/m3
Nitrogen Dioxide: 0.55 μg/m3
Sulphur Dioxide: 0.13 μg/m3
Ozone: 60.96 μg/m3

Astronomical

Sunrise: 6:25 AM
Sun Transit: 1:00 PM
Sunset: 7:35 PM
Daylight: 13 hrs 11 mins
Moonrise: 6:32 PM
Moon Transit: 10:55 PM
Moonset: 2:10 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.3%

Best Times for Fishing or Hunting

Major Periods

9:56 AM - 12:26 AM
12:00 AM - 12:00 AM

Minor Periods

6:02 PM - 7:32 PM
1:40 AM - 3:10 AM

Action Rating: 3 out of 5

Friday, September 5, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 46.2°F
Average Humidity: 78%
Chance of Rain: 0%
Wind: 17.9 mph
UV Index: 0.7

Air Quality

AQI: 1 - Good
PM2.5: 5.3 μg/m3
PM10: 5.58 μg/m3
Carbon Monoxide: 233.14 μg/m3
Nitrogen Dioxide: 0.54 μg/m3
Sulphur Dioxide: 0.07 μg/m3
Ozone: 67.84 μg/m3

Astronomical

Sunrise: 6:26 AM
Sun Transit: 1:00 PM
Sunset: 7:33 PM
Daylight: 13 hrs 7 mins
Moonrise: 6:55 PM
Moon Transit: 11:45 PM
Moonset: 3:28 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 96.6%

Best Times for Fishing or Hunting

Major Periods

10:47 AM - 1:17 PM
12:00 AM - 12:00 AM

Minor Periods

6:25 PM - 7:55 PM
2:58 AM - 4:28 AM

Action Rating: 3 out of 5

Saturday, September 6, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 47.1°F
Average Humidity: 64%
Chance of Rain: 0%
Wind: 12.1 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 0.81 μg/m3
PM10: 0.83 μg/m3
Carbon Monoxide: 228.57 μg/m3
Nitrogen Dioxide: 0.48 μg/m3
Sulphur Dioxide: 0.13 μg/m3
Ozone: 70.92 μg/m3

Astronomical

Sunrise: 6:27 AM
Sun Transit: 1:00 PM
Sunset: 7:31 PM
Daylight: 13 hrs 4 mins
Moonrise: 7:14 PM
Moon Transit: 12:00 AM
Moonset: 4:49 AM
Moon Phase: Full
Moon Illumination: 99.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:37 AM - 2:07 PM

Minor Periods

6:44 PM - 8:14 PM
4:19 AM - 5:49 AM

Action Rating: 3 out of 5

Sunday, September 7, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 49.1°F
Average Humidity: 63%
Chance of Rain: 0%
Wind: 12.8 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 1.77 μg/m3
PM10: 1.84 μg/m3
Carbon Monoxide: 259.79 μg/m3
Nitrogen Dioxide: 0.53 μg/m3
Sulphur Dioxide: 0.11 μg/m3
Ozone: 67.2 μg/m3

Astronomical

Sunrise: 6:29 AM
Sun Transit: 1:00 PM
Sunset: 7:29 PM
Daylight: 13 hrs mins
Moonrise: 7:31 PM
Moon Transit: 12:34 AM
Moonset: 6:10 AM
Moon Phase: Full
Moon Illumination: 99.8%

Best Times for Fishing or Hunting

Major Periods

12:04 AM - 2:34 AM
12:26 AM - 2:56 PM

Minor Periods

7:01 PM - 8:31 PM
5:40 AM - 7:10 AM

Action Rating: 4 out of 5

Monday, September 8, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 52.6°F
Average Humidity: 65%
Chance of Rain: 0%
Wind: 11.4 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 1.96 μg/m3
PM10: 2 μg/m3
Carbon Monoxide: 310.73 μg/m3
Nitrogen Dioxide: 1.08 μg/m3
Sulphur Dioxide: 0.04 μg/m3
Ozone: 56.92 μg/m3

Astronomical

Sunrise: 6:30 AM
Sun Transit: 12:58 AM
Sunset: 7:27 PM
Daylight: 12 hrs 57 mins
Moonrise: 7:48 PM
Moon Transit: 2:28 PM
Moonset: 7:31 AM
Moon Phase: Full
Moon Illumination: 97.6%

Best Times for Fishing or Hunting

Major Periods

1:58 PM - 4:28 PM
1:58 PM - 4:28 PM

Minor Periods

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