Water Temperature of Lake Superior in Grand Marais, MN

Current Water Temperature

50.0°F 10.0°C
Cold Thermal Gear Required
50.0°F
Frigid < 50°F
Cold 50°–60°
Cool 60°–70°
Comfortable 70°–80°
Warm 80°+

Cold shock risk with rapid dexterity loss (10–15 mins). Wetsuit or drysuit strongly advised for any immersion.

Measurement Time: Thursday, November 5, 2026, 6:30 AM CST

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

38.3°F
Clear
Conditions: Clear
Humidity: 86%
Feels Like: 32.5°F
Wind: WSW 8.1 mph
Wind Gusts: 14 mph
Pressure: 30.08 in
Precipitation: 0 in
Cloud Cover: 7%
Visibility: 6 mi
UV Index: 0

Weather Forecast

Sunny
Sat
H: 47°F
L: 38°F
Sunny
Sun
H: 48°F
L: 41°F
Overcast
Mon
H: 47°F
L: 39°F

Air Quality

EPA Index 1 • Good

Air quality is satisfactory, and air pollution poses little or no risk.

PM2.5
3.2 μg/m³
Good
PM10
3.3 μg/m³
Good
Ozone (O3)
55 μg/m³
Photochemical
NO2
3.1 μg/m³
Nitrogen Dioxide
SO2
0.7 μg/m³
Sulfur Dioxide
CO
140 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 39m daylight
Sunrise 6:55 AM
Solar Noon 11:45 AM
Sunset 4:35 PM
Moon
Waning Crescent • 1%
Moonrise 5:18 AM
Transit 10:26 AM
Moonset 3:24 PM

Best Times for Fishing or Hunting

Major Periods

9:56 AM - 12:26 PM
10:19 PM - 12:49 AM

Minor Periods

4:48 AM - 6:18 AM
2:54 PM - 4:24 PM
Action Rating:
Good Action 3/5

Small Craft Advisory issued November 7 at 1:14AM CST until November 8 at 6:00PM CST by NWS Duluth MN

Effective: Sat November 7, 2026, 1:14 AM
Expires: Sat November 7, 2026, 6:00 PM

* WHAT...West winds 15 to 25 kt with gusts up to 30 kt and waves 3 to 6 ft expected. * WHERE...Grand Portage to Grand Marais MN. * WHEN...From 10 AM this morning to 6 PM CST Sunday. * IMPACTS...Conditions will be hazardous to small craft.


Small Craft Advisory issued November 7 at 1:14AM CST until November 8 at 6:00PM CST by NWS Duluth MN

Effective: Sat November 7, 2026, 1:14 AM
Expires: Sat November 7, 2026, 6:00 PM

* WHAT...West winds 10 to 20 kt with gusts up to 30 kt and waves 1 to 4 ft expected. * WHERE...Portions of Lake Superior. * WHEN...From 4 PM this afternoon to 6 PM CST Sunday. * IMPACTS...Conditions will be hazardous to small craft.
Saturday, November 7, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 42.1°F
Average Humidity: 77%
Chance of Rain: 13%
Wind: 18.6 mph
UV Index: 1.4

Astronomical

Sun
9h 39m daylight
Sunrise 6:55 AM
Solar Noon 11:45 AM
Sunset 4:35 PM
Moon
Waning Crescent • 1%
Moonrise 5:18 AM
Transit 10:26 AM
Moonset 3:24 PM

Best Times for Fishing or Hunting

Major Periods

9:56 AM - 12:26 PM
10:19 PM - 12:49 AM

Minor Periods

4:48 AM - 6:18 AM
2:54 PM - 4:24 PM
Action Rating:
Good Action 3/5
Sunday, November 8, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 44.8°F
Average Humidity: 69%
Chance of Rain: 10%
Wind: 15 mph
UV Index: 1.6

Astronomical

Sun
9h 37m daylight
Sunrise 6:57 AM
Solar Noon 11:45 AM
Sunset 4:33 PM
Moon
New • 0%
Moonrise 6:31 AM
Transit 11:12 AM
Moonset 3:45 PM

Best Times for Fishing or Hunting

Major Periods

10:42 AM - 1:12 PM
11:06 PM - 1:36 AM

Minor Periods

6:01 AM - 7:31 AM
3:15 PM - 4:45 PM
Action Rating:
Very Good 4/5
Monday, November 9, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 43.7°F
Average Humidity: 78%
Chance of Rain: 16%
Wind: 11 mph
UV Index: 2

Astronomical

Sun
9h 34m daylight
Sunrise 6:58 AM
Solar Noon 11:45 AM
Sunset 4:32 PM
Moon
New • 2%
Moonrise 7:42 AM
Transit 12:00 PM
Moonset 4:12 PM

Best Times for Fishing or Hunting

Major Periods

11:30 AM - 2:00 PM
11:55 PM - 2:25 AM

Minor Periods

7:12 AM - 8:42 AM
3:42 PM - 5:12 PM
Action Rating:
Very Good 4/5
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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