Water Temperature of Lake Superior in Grand Marais, MN

Current Water Temperature

48.0°F

Measurement Time: Wednesday, October 7, 2026, 6:25 AM CDT

Temperature Locations

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Lake Superior

Station Name: Grand Marais
Data Source: USGS

Elevation Above Sea Level: 607 feet

Nearest Address:
2nd Street
Grand Marais, MN 55604
Cook County

GPS Coordinates: 47.7517, -90.3283

Nearby Water Temperatures

Grand Marais Harbor, Grand Marais, MN (0.6 mi)
Poplar River, Lutsen, MN (19.4 mi)
Grand Portage River, Grand Portage, MN (33.3 mi)
Lake Superior, Lake Superior, MI (38.1 mi)
Baptism River, Illgen City, MN (49.7 mi)
Washington Creek, Windigo, MI (56.1 mi)
Kawishiwi River, Ely, MN (57.2 mi)
Dunka River, Babbitt, MN (71.4 mi)
Dunka River, Babbitt, MN (71.7 mi)
Partrige River, Babbitt, MN (74.9 mi)
Lake Superior, Two Harbors, MN (80.5 mi)
Chequamegon Bay, Ashland, WI (81.7 mi)
Saint Louis River, Hoyt Lakes, MN (81.9 mi)
Lake Superior, Calumet, MI (86.9 mi)
Presque Isle River, Tula, MI (87.2 mi)

Weather for Grand Marais, Minnesota

Current Weather

48.9°F
Clear
Conditions: Clear
Humidity: 76%
Feels Like: 45.5°F
Wind: WNW 7.2 mph
Wind Gusts: 17.5 mph
Pressure: 29.84 in
Precipitation: 0 in
Cloud Cover: 5%
Visibility: 6 mi
UV Index: 0

Weather Forecast

Sunny
Wed
H: 62°F
L: 47°F
Sunny
Thu
H: 57°F
L: 46°F
Overcast
Fri
H: 51°F
L: 44°F
Overcast
Sat
H: 59°F
L: 50°F
Sunny
Sun
H: 64°F
L: 55°F

Air Quality

AQI: 1 - Good
PM2.5: 0.3 μg/m3
PM10: 0.3 μg/m3
Carbon Monoxide: 109 μg/m3
Nitrogen Dioxide: 0.4 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 72 μg/m3

Astronomical

Sunrise: 7:09 AM
Sun Transit: 12:49 AM
Sunset: 6:29 PM
Daylight: 11 hrs 20 mins
Moonrise: 3:33 AM
Moon Transit: 10:30 AM
Moonset: 5:11 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:00 AM - 12:30 AM

Minor Periods

4:41 PM - 6:11 PM
3:03 AM - 4:33 AM

Action Rating: 3 out of 5

Small Craft Advisory issued October 7 at 10:02AM CDT until October 7 at 8:00PM CDT by NWS Duluth MN

Effective: Wed October 7, 2026, 10:02 AM
Expires: Wed October 7, 2026, 8:00 PM

* WHAT...West winds 10 to 15 kt with gusts up to 25 kt and waves 1 to 3 ft. * WHERE...Grand Portage to Grand Marais MN. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Conditions will be hazardous to small craft.

Anyone operating a smaller vessel should avoid navigating in hazardous conditions.
Wednesday, October 7, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 53.8°F
Average Humidity: 63%
Chance of Rain: 38%
Wind: 15 mph
UV Index: 3.1

Air Quality

AQI: 1 - Good
PM2.5: 0.97 μg/m3
PM10: 0.98 μg/m3
Carbon Monoxide: 110.71 μg/m3
Nitrogen Dioxide: 0.69 μg/m3
Sulphur Dioxide: 0.45 μg/m3
Ozone: 71.58 μg/m3

Astronomical

Sunrise: 7:09 AM
Sun Transit: 12:49 AM
Sunset: 6:29 PM
Daylight: 11 hrs 20 mins
Moonrise: 3:33 AM
Moon Transit: 10:30 AM
Moonset: 5:11 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:00 AM - 12:30 AM

Minor Periods

4:41 PM - 6:11 PM
3:03 AM - 4:33 AM

Action Rating: 3 out of 5

Thursday, October 8, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 50.5°F
Average Humidity: 64%
Chance of Rain: 8%
Wind: 11.6 mph
UV Index: 2.5

Air Quality

AQI: 1 - Good
PM2.5: 0.5 μg/m3
PM10: 0.63 μg/m3
Carbon Monoxide: 111.42 μg/m3
Nitrogen Dioxide: 0.57 μg/m3
Sulphur Dioxide: 0.74 μg/m3
Ozone: 66.54 μg/m3

Astronomical

Sunrise: 7:10 AM
Sun Transit: 12:48 AM
Sunset: 6:27 PM
Daylight: 11 hrs 16 mins
Moonrise: 4:50 AM
Moon Transit: 11:16 AM
Moonset: 5:27 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:46 AM - 1:16 PM

Minor Periods

4:57 PM - 6:27 PM
4:20 AM - 5:50 AM

Action Rating: 3 out of 5

Friday, October 9, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 48°F
Average Humidity: 73%
Chance of Rain: 17%
Wind: 17.2 mph
UV Index: 2.6

Air Quality

AQI: 1 - Good
PM2.5: 1 μg/m3
PM10: 1.34 μg/m3
Carbon Monoxide: 116.38 μg/m3
Nitrogen Dioxide: 0.7 μg/m3
Sulphur Dioxide: 0.65 μg/m3
Ozone: 63.33 μg/m3

Astronomical

Sunrise: 7:12 AM
Sun Transit: 12:48 AM
Sunset: 6:25 PM
Daylight: 11 hrs 13 mins
Moonrise: 6:05 AM
Moon Transit: 12:01 AM
Moonset: 5:43 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:31 AM - 2:01 PM

Minor Periods

5:13 PM - 6:43 PM
5:35 AM - 7:05 AM

Action Rating: 4 out of 5

Saturday, October 10, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 54°F
Average Humidity: 83%
Chance of Rain: 18%
Wind: 12.5 mph
UV Index: 2.7

Air Quality

AQI: 1 - Good
PM2.5: 5.13 μg/m3
PM10: 5.23 μg/m3
Carbon Monoxide: 135.79 μg/m3
Nitrogen Dioxide: 1.33 μg/m3
Sulphur Dioxide: 0.64 μg/m3
Ozone: 100.79 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 12:48 AM
Sunset: 6:23 PM
Daylight: 11 hrs 10 mins
Moonrise: 7:19 AM
Moon Transit: 12:45 AM
Moonset: 6:00 PM
Moon Phase: New
Moon Illumination: 0.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:15 AM - 2:45 PM

Minor Periods

5:30 PM - 7:00 PM
6:49 AM - 8:19 AM

Action Rating: 4 out of 5

Sunday, October 11, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 59.1°F
Average Humidity: 77%
Chance of Rain: 15%
Wind: 11 mph
UV Index: 3

Air Quality

AQI: 1 - Good
PM2.5: 5.41 μg/m3
PM10: 5.61 μg/m3
Carbon Monoxide: 145.8 μg/m3
Nitrogen Dioxide: 1.62 μg/m3
Sulphur Dioxide: 0.63 μg/m3
Ozone: 98.67 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 12:48 AM
Sunset: 6:21 PM
Daylight: 11 hrs 6 mins
Moonrise: 8:33 AM
Moon Transit: 1:31 PM
Moonset: 6:19 PM
Moon Phase: New
Moon Illumination: 3.3%

Best Times for Fishing or Hunting

Major Periods

12:35 AM - 3:05 AM
1:01 PM - 3:31 PM

Minor Periods

5:49 PM - 7:19 PM
8:03 AM - 9:33 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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