Water Temperature of Grand Marais Harbor in Grand Marais, MN

Current Water Temperature

51.3°F

Measurement Time: Wednesday, August 26, 2026, 6:18 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

64°F

Conditions: Partly Cloudy

Humidity: 73%

Wind: NW 5 mph

Dew Point: 56°F

Weather Forecast

Tonight
52°F - Partly Cloudy

Thursday
62°F - Mostly Sunny then Chance Rain Showers

Thursday Night
50°F - Mostly Cloudy

Friday
58°F - Mostly Sunny

Friday Night
49°F - Mostly Cloudy

Saturday
64°F - Chance Rain Showers

Saturday Night
58°F - Chance Showers And Thunderstorms

Sunday
68°F - Chance Showers And Thunderstorms

Sunday Night
58°F - Chance Showers And Thunderstorms

Monday
69°F - Chance Rain Showers

Monday Night
57°F - Chance Rain Showers

Tuesday
69°F - Slight Chance Rain Showers then Partly Sunny

Tuesday Night
56°F - Mostly Cloudy then Slight Chance Rain Showers

Wednesday
68°F - Slight Chance Rain Showers then Mostly Cloudy

Astronomical

Sunrise: 6:12 AM
Sun Transit: 1:03 PM
Sunset: 7:53 PM
Daylight: 13 hrs 41 mins

Moonrise: 7:24 PM
Moon Transit: 12:00 AM
Moonset: 4:16 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 98.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:25 AM - 1:55 PM

Minor Periods

6:54 PM - 8:24 PM
3:46 AM - 5:16 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:12 AM
Sun Transit: 1:03 PM
Sunset: 7:53 PM
Daylight: 13 hrs 41 mins

Moonrise: 7:24 PM
Moon Transit: 12:00 AM
Moonset: 4:16 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 98.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:25 AM - 1:55 PM

Minor Periods

6:54 PM - 8:24 PM
3:46 AM - 5:16 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:13 AM
Sun Transit: 1:02 PM
Sunset: 7:51 PM
Daylight: 13 hrs 38 mins

Moonrise: 7:42 PM
Moon Transit: 12:20 AM
Moonset: 5:28 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:10 AM - 2:40 PM

Minor Periods

7:12 PM - 8:42 PM
4:58 AM - 6:28 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:13 AM
Sun Transit: 1:02 PM
Sunset: 7:51 PM
Daylight: 13 hrs 38 mins

Moonrise: 7:42 PM
Moon Transit: 12:20 AM
Moonset: 5:28 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:10 AM - 2:40 PM

Minor Periods

7:12 PM - 8:42 PM
4:58 AM - 6:28 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:15 AM
Sun Transit: 1:02 PM
Sunset: 7:50 PM
Daylight: 13 hrs 35 mins

Moonrise: 7:58 PM
Moon Transit: 1:05 AM
Moonset: 6:41 AM
Moon Phase: Full
Moon Illumination: 98.7%

Best Times for Fishing or Hunting

Major Periods

12:35 AM - 3:05 AM
12:54 AM - 3:24 PM

Minor Periods

7:28 PM - 8:58 PM
6:11 AM - 7:41 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:15 AM
Sun Transit: 1:02 PM
Sunset: 7:50 PM
Daylight: 13 hrs 35 mins

Moonrise: 7:58 PM
Moon Transit: 1:05 AM
Moonset: 6:41 AM
Moon Phase: Full
Moon Illumination: 98.7%

Best Times for Fishing or Hunting

Major Periods

12:35 AM - 3:05 AM
12:54 AM - 3:24 PM

Minor Periods

7:28 PM - 8:58 PM
6:11 AM - 7:41 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:16 AM
Sun Transit: 1:02 PM
Sunset: 7:48 PM
Daylight: 13 hrs 32 mins

Moonrise: 8:13 PM
Moon Transit: 1:48 AM
Moonset: 7:54 AM
Moon Phase: Full
Moon Illumination: 95.0%

Best Times for Fishing or Hunting

Major Periods

1:18 AM - 3:48 AM
12:00 AM - 12:00 AM

Minor Periods

7:43 PM - 9:13 PM
7:24 AM - 8:54 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:16 AM
Sun Transit: 1:02 PM
Sunset: 7:48 PM
Daylight: 13 hrs 32 mins

Moonrise: 8:13 PM
Moon Transit: 1:48 AM
Moonset: 7:54 AM
Moon Phase: Full
Moon Illumination: 95.0%

Best Times for Fishing or Hunting

Major Periods

1:18 AM - 3:48 AM
12:00 AM - 12:00 AM

Minor Periods

7:43 PM - 9:13 PM
7:24 AM - 8:54 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:17 AM
Sun Transit: 1:01 PM
Sunset: 7:46 PM
Daylight: 13 hrs 28 mins

Moonrise: 8:29 PM
Moon Transit: 12:00 AM
Moonset: 9:08 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

7:59 PM - 9:29 PM
8:38 AM - 10:08 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:17 AM
Sun Transit: 1:01 PM
Sunset: 7:46 PM
Daylight: 13 hrs 28 mins

Moonrise: 8:29 PM
Moon Transit: 12:00 AM
Moonset: 9:08 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

7:59 PM - 9:29 PM
8:38 AM - 10:08 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:19 AM
Sun Transit: 1:01 PM
Sunset: 7:44 PM
Daylight: 13 hrs 25 mins

Moonrise: 8:48 PM
Moon Transit: 3:18 AM
Moonset: 10:24 AM
Moon Phase: Waning Gibbous
Moon Illumination: 80.9%

Best Times for Fishing or Hunting

Major Periods

2:48 AM - 5:18 AM
3:09 PM - 5:39 PM

Minor Periods

8:18 PM - 9:48 PM
9:54 AM - 11:24 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:19 AM
Sun Transit: 1:01 PM
Sunset: 7:44 PM
Daylight: 13 hrs 25 mins

Moonrise: 8:48 PM
Moon Transit: 3:18 AM
Moonset: 10:24 AM
Moon Phase: Waning Gibbous
Moon Illumination: 80.9%

Best Times for Fishing or Hunting

Major Periods

2:48 AM - 5:18 AM
3:09 PM - 5:39 PM

Minor Periods

8:18 PM - 9:48 PM
9:54 AM - 11:24 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:20 AM
Sun Transit: 1:01 PM
Sunset: 7:42 PM
Daylight: 13 hrs 21 mins

Moonrise: 9:10 PM
Moon Transit: 4:06 AM
Moonset: 11:43 AM
Moon Phase: Waning Gibbous
Moon Illumination: 71.2%

Best Times for Fishing or Hunting

Major Periods

3:36 AM - 6:06 AM
3:59 PM - 6:29 PM

Minor Periods

8:40 PM - 10:10 PM
11:13 AM - 12:43 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:20 AM
Sun Transit: 1:01 PM
Sunset: 7:42 PM
Daylight: 13 hrs 21 mins

Moonrise: 9:10 PM
Moon Transit: 4:06 AM
Moonset: 11:43 AM
Moon Phase: Waning Gibbous
Moon Illumination: 71.2%

Best Times for Fishing or Hunting

Major Periods

3:36 AM - 6:06 AM
3:59 PM - 6:29 PM

Minor Periods

8:40 PM - 10:10 PM
11:13 AM - 12:43 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

Air Quality

AQI: 0 -

PM2.5: 0 μg/m3

PM10: 0 μg/m3

Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:21 AM
Sun Transit: 1:00 PM
Sunset: 7:40 PM
Daylight: 13 hrs 18 mins

Moonrise: 9:39 PM
Moon Transit: 4:58 AM
Moonset: 1:05 PM
Moon Phase: Waning Gibbous
Moon Illumination: 60.5%

Best Times for Fishing or Hunting

Major Periods

4:28 AM - 6:58 AM
4:53 PM - 7:23 PM

Minor Periods

9:09 PM - 10:39 PM
12:35 AM - 2:05 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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