Water Temperature of Grand Marais Harbor in Grand Marais, MN
Current Water Temperature
Measurement Time: Monday, April 27, 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 ArenaStation 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

Five Day Weather Forecast

Mon
H: 50°F
L: 39°F

Tue
H: 48°F
L: 32°F

Wed
H: 46°F
L: 31°F

Thu
H: 41°F
L: 31°F

Fri
H: 42°F
L: 29°F
Air Quality
Nitrogen Dioxide: 3.18 μg/m3
Sulphur Dioxide: 1.28 μg/m3
Ozone: 95 μg/m3
Astronomical
Sun Transit: 1:00 PM
Sunset: 8:09 PM
Daylight: 14 hrs 18 mins
Moon Transit: 10:23 PM
Moonset: 4:10 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 81.8%
Best Times for Fishing or Hunting
Major Periods
9:30 AM - 12:00 AM12:00 AM - 12:00 AM
Minor Periods
3:38 PM - 5:08 PM3:40 AM - 5:10 AM
Action Rating: 2 out of 5
Flood Watch issued April 27 at 12:38AM CDT until April 28 at 3:00AM CDT by NWS Duluth MN
Effective: Mon April 27, 2026, 12:38 AM
Expires: Tue April 28, 2026, 12:45 AM
* WHAT...Flooding caused by rain and snowmelt continues to be possible. * WHERE...In Minnesota, Cook and Lake Counties. This includes the Tribal Lands of the Grand Portage Reservation.This also includes the Boundary Waters eastern and central area. * WHEN...From 10 AM CDT this morning through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Around 1 to 2 inches of rain is expected to fall. Eastern Cook County also has several inches of lingering snowpack. While rainfall rates are not expected to be heavy, prolonged moderate rainfall on top of saturated soils and should lead to runoff. Area rivers and streams are already running at elevated levels and could rise to minor flooding levels with runoff due to the additional rainfall. - Flood safety information can be found at www.weather.gov/safety/flood.
You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
Flood Watch issued April 27 at 11:44AM CDT until April 28 at 3:00AM CDT by NWS Duluth MN
Effective: Mon April 27, 2026, 11:44 AM
Expires: Tue April 28, 2026, 3:00 AM
* WHAT...Flooding caused by rain and snowmelt continues to be possible. * WHERE...In Minnesota, Cook and Lake Counties. This includes the Tribal Lands of the Grand Portage Reservation.This also includes the Boundary Waters eastern and central area. * WHEN...Through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Be mindful of cold, fast-moving water near rivers and streams. * ADDITIONAL DETAILS... - An additional three quarters to one and one half inch of rain is expected to fall this afternoon into tonight. Eastern Cook County also has several inches of lingering snowpack. While rainfall rates are not expected to be heavy, prolonged moderate rainfall on top of saturated soils will lead to runoff. Area rivers and streams are already running at elevated levels and could rise to minor flooding levels with runoff due to the additional rainfall. - Flood safety information can be found at www.weather.gov/safety/flood.
You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
Weather Forecast
Air Quality
Nitrogen Dioxide: 1.99 μg/m3
Sulphur Dioxide: 1.04 μg/m3
Ozone: 88.24 μg/m3
Astronomical
Sun Transit: 1:00 PM
Sunset: 8:09 PM
Daylight: 14 hrs 18 mins
Moon Transit: 10:23 PM
Moonset: 4:10 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 81.8%
Best Times for Fishing or Hunting
Major Periods
9:30 AM - 12:00 AM12:00 AM - 12:00 AM
Minor Periods
3:38 PM - 5:08 PM3:40 AM - 5:10 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 1.39 μg/m3
Sulphur Dioxide: 0.87 μg/m3
Ozone: 98.04 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 8:10 PM
Daylight: 14 hrs 21 mins
Moon Transit: 11:04 PM
Moonset: 4:25 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 89.6%
Best Times for Fishing or Hunting
Major Periods
10:11 AM - 12:41 AM12:00 AM - 12:00 AM
Minor Periods
4:48 PM - 6:18 PM3:55 AM - 5:25 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 1.29 μg/m3
Sulphur Dioxide: 0.73 μg/m3
Ozone: 78.44 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 8:11 PM
Daylight: 14 hrs 25 mins
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 PM12:00 AM - 12:00 AM
Minor Periods
5:58 PM - 7:28 PM4:09 AM - 5:39 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 1.35 μg/m3
Sulphur Dioxide: 0.73 μg/m3
Ozone: 81.72 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 8:13 PM
Daylight: 14 hrs 28 mins
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 AM11:35 AM - 2:05 PM
Minor Periods
7:08 PM - 8:38 PM4:25 AM - 5:55 AM
Action Rating: 5 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 2.77 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 76.08 μg/m3
Astronomical
Sun Transit: 12:58 AM
Sunset: 8:14 PM
Daylight: 14 hrs 31 mins
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 AM12:20 AM - 2:50 PM
Minor Periods
8:19 PM - 9:49 PM4:43 AM - 6:13 AM
Action Rating: 5 out of 5
