Water Temperature of Grand Marais Harbor in Grand Marais, MN

Current Water Temperature

40.5°F

Measurement Time: Wednesday, April 29, 2026, 2:18 AM 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

34°F
Sunny
Sunny
27.3°F
36.2°F
88%
NNW 7.8 mph
12.3 mph
33.3°F
28.9°F
0 in
0%
6 mi
1016 mbar
0

Five Day Weather Forecast

Moderate rain
Wed
H: 42°F
L: 33°F
Patchy rain nearby
Thu
H: 41°F
L: 30°F
Sunny
Fri
H: 40°F
L: 29°F
Sunny
Sat
H: 42°F
L: 28°F
Partly Cloudy
Sun
H: 53°F
L: 33°F

Air Quality

AQI: 1 - Good
PM2.5: 8.98 μg/m3
PM10: 10.18 μg/m3
Carbon Monoxide: 143.68 μg/m3
Nitrogen Dioxide: 1.68 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 72 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 12:58 AM
Sunset: 8:11 PM
Daylight: 14 hrs 25 mins
Moonrise: 6:28 PM
Moon Transit: 11:47 PM
Moonset: 4:39 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 95.5%

Best Times for Fishing or Hunting

Major Periods

10:53 AM - 1:23 PM
12:00 AM - 12:00 AM

Minor Periods

5:58 PM - 7:28 PM
4:09 AM - 5:39 AM

Action Rating: 3 out of 5

Flood Advisory issued April 28 at 6:59PM CDT until April 29 at 7:00PM CDT by NWS Duluth MN

Effective: Tue April 28, 2026, 6:59 PM
Expires: Wed April 29, 2026, 7:00 PM

* WHAT...Small stream flooding caused by rain and snowmelt continues. * WHERE...In Minnesota, Cook and Lake Counties. * WHEN...Until 700 PM CDT Wednesday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. River or stream flows are elevated. Flooding is occurring on area rivers that are popular for waterfall viewing. * ADDITIONAL DETAILS... - At 655 PM CDT Tuesday, river gauges continue to suggest that there are areas of high water and localized minor flooding from Monday's rainfall. No additional rainfall is expected. One to two inches of rain that has already fallen and snowmelt runoff in Cook County will keep river levels elevated today. The Baptism River and Beaver River in Lake County are also experiencing high flows today due to runoff from the one to two inches of rainfall yesterday and last night. - Some locations that will experience flooding include... Grand Marais, Gunflint Lake, Two Harbors, Silver Bay, Grand Portage, Clear Lake, Lutsen, Tofte, Beaver Bay, Dumbbell Lake, Forest Center, Temperance River State Park, George Manitou State Park, Taconite Harbor, Sugar Loaf Cove, Isabella, Little Saganaga Lake, Little Marais, Finland and Alpine Lake. - Flood safety information can be found at www.weather.gov/safety/flood.

Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Campers and hikers should avoid flooded trail crossings. If camping at a site along or near the banks of rivers or streams, move away from those locations and seek higher ground. Trails in hilly terrain can quickly become unstable during or shortly after heavy rainfall.
Wednesday, April 29, 2026

Weather Forecast

Moderate rain
41.7°F
32.8°F
37.1°F
81%
0.26 in
89%
0%
10.7 mph
4.4


Air Quality

AQI: 1 - Good
PM2.5: 8.28 μg/m3
PM10: 9.52 μg/m3
Carbon Monoxide: 146.4 μg/m3
Nitrogen Dioxide: 2.15 μg/m3
Sulphur Dioxide: 0.79 μg/m3
Ozone: 71.12 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 12:58 AM
Sunset: 8:11 PM
Daylight: 14 hrs 25 mins
Moonrise: 6:28 PM
Moon Transit: 11:47 PM
Moonset: 4:39 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 95.5%

Best Times for Fishing or Hunting

Major Periods

10:53 AM - 1:23 PM
12:00 AM - 12:00 AM

Minor Periods

5:58 PM - 7:28 PM
4:09 AM - 5:39 AM

Action Rating: 3 out of 5

Thursday, April 30, 2026

Weather Forecast

Patchy rain nearby
41.4°F
30.2°F
35.7°F
70%
0.01 in
89%
0%
8.9 mph
3.9


Air Quality

AQI: 1 - Good
PM2.5: 1.95 μg/m3
PM10: 2.28 μg/m3
Carbon Monoxide: 142 μg/m3
Nitrogen Dioxide: 1.53 μg/m3
Sulphur Dioxide: 0.72 μg/m3
Ozone: 73.8 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 12:58 AM
Sunset: 8:13 PM
Daylight: 14 hrs 28 mins
Moonrise: 7:38 PM
Moon Transit: 12:00 AM
Moonset: 4:55 AM
Moon Phase: Full
Moon Illumination: 99.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:35 AM - 2:05 PM

Minor Periods

7:08 PM - 8:38 PM
4:25 AM - 5:55 AM

Action Rating: 5 out of 5

Friday, May 1, 2026

Weather Forecast

Sunny
39.8°F
28.6°F
33.7°F
70%
0 in
0%
0%
11.2 mph
5.7


Air Quality

AQI: 1 - Good
PM2.5: 3.91 μg/m3
PM10: 6.5 μg/m3
Carbon Monoxide: 137.77 μg/m3
Nitrogen Dioxide: 1.24 μg/m3
Sulphur Dioxide: 0.76 μg/m3
Ozone: 88.2 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 12:58 AM
Sunset: 8:14 PM
Daylight: 14 hrs 31 mins
Moonrise: 8:49 PM
Moon Transit: 12:30 AM
Moonset: 5:13 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 2:30 AM
12:20 AM - 2:50 PM

Minor Periods

8:19 PM - 9:49 PM
4:43 AM - 6:13 AM

Action Rating: 5 out of 5

Saturday, May 2, 2026

Weather Forecast

Sunny
42.2°F
28.2°F
36°F
66%
0 in
0%
0%
8.7 mph
5.7


Air Quality

AQI: 1 - Good
PM2.5: 3.37 μg/m3
PM10: 4.9 μg/m3
Carbon Monoxide: 142.79 μg/m3
Nitrogen Dioxide: 1.45 μg/m3
Sulphur Dioxide: 0.86 μg/m3
Ozone: 87.64 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 12:58 AM
Sunset: 8:16 PM
Daylight: 14 hrs 34 mins
Moonrise: 9:58 PM
Moon Transit: 1:16 AM
Moonset: 5:36 AM
Moon Phase: Full
Moon Illumination: 98.4%

Best Times for Fishing or Hunting

Major Periods

12:46 AM - 3:16 AM
1:07 PM - 3:37 PM

Minor Periods

9:28 PM - 10:58 PM
5:06 AM - 6:36 AM

Action Rating: 3 out of 5

Sunday, May 3, 2026

Weather Forecast

Partly Cloudy
52.9°F
32.5°F
41.2°F
68%
0 in
0%
0%
11 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 7.68 μg/m3
PM10: 12.41 μg/m3
Carbon Monoxide: 152.22 μg/m3
Nitrogen Dioxide: 2.45 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 84.38 μg/m3

Astronomical

Sunrise: 5:40 AM
Sun Transit: 12:58 AM
Sunset: 8:17 PM
Daylight: 14 hrs 37 mins
Moonrise: 11:04 PM
Moon Transit: 2:04 AM
Moonset: 6:04 AM
Moon Phase: Full
Moon Illumination: 94.4%

Best Times for Fishing or Hunting

Major Periods

1:34 AM - 4:04 AM
1:56 PM - 4:26 PM

Minor Periods

12:00 AM - 12:00 AM
5:34 AM - 7:04 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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