Water Temperature of Lake Superior in Grand Marais, MN

Current Water Temperature

40.0°F

Measurement Time: Thursday, April 2, 2026, 6:00 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

30.9°F
Light freezing rain
Light freezing rain
17.9°F
32.6°F
89%
ENE 22.1 mph
26.8 mph
19.8°F
29°F
0 in
0%
0 mi
1019 mbar
1.3

Five Day Weather Forecast

Blowing snow
Thu
H: 33°F
L: 28°F
Moderate or heavy snow showers
Fri
H: 35°F
L: 25°F
Blowing snow
Sat
H: 29°F
L: 24°F
Light freezing rain
Sun
H: 37°F
L: 23°F
Light freezing rain
Mon
H: 29°F
L: 12°F

Air Quality

AQI: 1 - Good
PM2.5: 1.48 μg/m3
PM10: 1.68 μg/m3
Carbon Monoxide: 158.68 μg/m3
Nitrogen Dioxide: 1.18 μg/m3
Sulphur Dioxide: 0.98 μg/m3
Ozone: 96 μg/m3

Astronomical

Sunrise: 6:38 AM
Sun Transit: 1:04 PM
Sunset: 7:33 PM
Daylight: 12 hrs 55 mins
Moonrise: 8:41 PM
Moon Transit: 1:07 AM
Moonset: 6:32 AM
Moon Phase: Full
Moon Illumination: 99.5%

Best Times for Fishing or Hunting

Major Periods

12:37 AM - 3:07 AM
12:55 AM - 3:25 PM

Minor Periods

8:11 PM - 9:41 PM
6:02 AM - 7:32 AM

Action Rating: 3 out of 5

Winter Storm Watch issued April 2 at 1:30AM CDT until April 5 at 1:00AM CDT by NWS Duluth MN

Effective: Thu April 2, 2026, 1:30 AM
Expires: Thu April 2, 2026, 1:30 PM

* WHAT...For the Winter Storm Warning, heavy snow. Additional snow accumulations between 4 and 7 inches. Winds gusting as high as 40 mph. For the Winter Storm Watch, heavy mixed precipitation possible. Total snow and sleet accumulations between 6 and 9 inches and ice accumulations around one tenth of an inch possible. Winds could gust as high as 40 mph. * WHERE...Southern Cook and Southern Lake Counties. This includes the Tribal Lands of the Grand Portage Reservation. * WHEN...For the Winter Storm Warning, until 7 AM CDT Friday. For the Winter Storm Watch, from Friday afternoon through late Saturday night. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday morning and evening commutes. * ADDITIONAL DETAILS...The majority of the snowfall is expected to fall during the daytime hours. With the high sun angle and temperatures hovering just above freezing, snowfall will have a difficult time accumulating on warm surfaces leading to a slushy mess.

If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Call 511 or visit www.511mn.org for Minnesota road information. Monitor the latest forecasts for updates on this situation.


Winter Storm Watch issued April 2 at 1:30AM CDT until April 5 at 1:00AM CDT by NWS Duluth MN

Effective: Thu April 2, 2026, 1:30 AM
Expires: Thu April 2, 2026, 1:30 PM

* WHAT...For the Winter Weather Advisory, snow. Additional snow accumulations between 4 and 6 inches. Winds gusting as high as 35 mph. For the Winter Storm Watch, heavy mixed precipitation possible. Total snow and sleet accumulations between 5 and 8 inches and ice accumulations around one tenth of an inch possible. * WHERE...Central and North St. Louis, and Northern Cook and Lake Counties. This includes the Tribal Lands of the Bois Forte Band, Nett Lake and, Lake Vermilion areas. Other locations including Voyageurs National Park. The entire Boundary Waters is also included. * WHEN...For the Winter Weather Advisory, until 7 AM CDT Friday. For the Winter Storm Watch, from Friday afternoon through late Saturday night. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday morning and evening commutes. * ADDITIONAL DETAILS...The majority of the snowfall is expected to fall during the daytime hours. With the high sun angle and temperatures hovering just above freezing, snowfall will have a difficult time accumulating on warm surfaces leading to a slushy mess.

Slow down and use caution while traveling. Call 511 or visit www.511mn.org for Minnesota road information. Monitor the latest forecasts for updates on this situation.


Winter Storm Warning issued April 2 at 1:30AM CDT until April 3 at 7:00AM CDT by NWS Duluth MN

Effective: Thu April 2, 2026, 1:30 AM
Expires: Thu April 2, 2026, 1:30 PM

* WHAT...For the Winter Storm Warning, heavy snow. Additional snow accumulations between 4 and 7 inches. Winds gusting as high as 40 mph. For the Winter Storm Watch, heavy mixed precipitation possible. Total snow and sleet accumulations between 6 and 9 inches and ice accumulations around one tenth of an inch possible. Winds could gust as high as 40 mph. * WHERE...Southern Cook and Southern Lake Counties. This includes the Tribal Lands of the Grand Portage Reservation. * WHEN...For the Winter Storm Warning, until 7 AM CDT Friday. For the Winter Storm Watch, from Friday afternoon through late Saturday night. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday morning and evening commutes. * ADDITIONAL DETAILS...The majority of the snowfall is expected to fall during the daytime hours. With the high sun angle and temperatures hovering just above freezing, snowfall will have a difficult time accumulating on warm surfaces leading to a slushy mess.

If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Call 511 or visit www.511mn.org for Minnesota road information. Monitor the latest forecasts for updates on this situation.


Winter Weather Advisory issued April 2 at 1:30AM CDT until April 3 at 7:00AM CDT by NWS Duluth MN

Effective: Thu April 2, 2026, 1:30 AM
Expires: Thu April 2, 2026, 1:30 PM

* WHAT...For the Winter Weather Advisory, snow. Additional snow accumulations between 4 and 6 inches. Winds gusting as high as 35 mph. For the Winter Storm Watch, heavy mixed precipitation possible. Total snow and sleet accumulations between 5 and 8 inches and ice accumulations around one tenth of an inch possible. * WHERE...Central and North St. Louis, and Northern Cook and Lake Counties. This includes the Tribal Lands of the Bois Forte Band, Nett Lake and, Lake Vermilion areas. Other locations including Voyageurs National Park. The entire Boundary Waters is also included. * WHEN...For the Winter Weather Advisory, until 7 AM CDT Friday. For the Winter Storm Watch, from Friday afternoon through late Saturday night. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday morning and evening commutes. * ADDITIONAL DETAILS...The majority of the snowfall is expected to fall during the daytime hours. With the high sun angle and temperatures hovering just above freezing, snowfall will have a difficult time accumulating on warm surfaces leading to a slushy mess.

Slow down and use caution while traveling. Call 511 or visit www.511mn.org for Minnesota road information. Monitor the latest forecasts for updates on this situation.


Thursday, April 2, 2026

Weather Forecast

Blowing snow
33.3°F
27.9°F
31.3°F
82%
0.51 in
80%
42%
24.2 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 1.37 μg/m3
PM10: 1.67 μg/m3
Carbon Monoxide: 157.44 μg/m3
Nitrogen Dioxide: 1 μg/m3
Sulphur Dioxide: 0.88 μg/m3
Ozone: 96.8 μg/m3

Astronomical

Sunrise: 6:38 AM
Sun Transit: 1:04 PM
Sunset: 7:33 PM
Daylight: 12 hrs 55 mins
Moonrise: 8:41 PM
Moon Transit: 1:07 AM
Moonset: 6:32 AM
Moon Phase: Full
Moon Illumination: 99.5%

Best Times for Fishing or Hunting

Major Periods

12:37 AM - 3:07 AM
12:55 AM - 3:25 PM

Minor Periods

8:11 PM - 9:41 PM
6:02 AM - 7:32 AM

Action Rating: 3 out of 5

Friday, April 3, 2026

Weather Forecast

Moderate or heavy snow showers
35.2°F
25.2°F
30.2°F
84%
0.71 in
77%
28%
22.1 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 1.24 μg/m3
PM10: 1.41 μg/m3
Carbon Monoxide: 147.76 μg/m3
Nitrogen Dioxide: 1.01 μg/m3
Sulphur Dioxide: 1.04 μg/m3
Ozone: 102.64 μg/m3

Astronomical

Sunrise: 6:36 AM
Sun Transit: 1:04 PM
Sunset: 7:34 PM
Daylight: 12 hrs 58 mins
Moonrise: 9:52 PM
Moon Transit: 1:50 AM
Moonset: 6:49 AM
Moon Phase: Full
Moon Illumination: 96.6%

Best Times for Fishing or Hunting

Major Periods

1:20 AM - 3:50 AM
1:39 PM - 4:09 PM

Minor Periods

9:22 PM - 10:52 PM
6:19 AM - 7:49 AM

Action Rating: 4 out of 5

Saturday, April 4, 2026

Weather Forecast

Blowing snow
29.3°F
23.5°F
27.7°F
88%
2.05 in
60%
54%
25.3 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 1.09 μg/m3
PM10: 1.24 μg/m3
Carbon Monoxide: 145.96 μg/m3
Nitrogen Dioxide: 1.04 μg/m3
Sulphur Dioxide: 0.81 μg/m3
Ozone: 100.76 μg/m3

Astronomical

Sunrise: 6:34 AM
Sun Transit: 1:04 PM
Sunset: 7:36 PM
Daylight: 13 hrs 2 mins
Moonrise: 11:03 PM
Moon Transit: 2:34 AM
Moonset: 7:08 AM
Moon Phase: Full
Moon Illumination: 91.3%

Best Times for Fishing or Hunting

Major Periods

2:04 AM - 4:34 AM
2:24 PM - 4:54 PM

Minor Periods

12:00 AM - 12:00 AM
6:38 AM - 8:08 AM

Action Rating: 4 out of 5

Sunday, April 5, 2026

Weather Forecast

Light freezing rain
36.5°F
22.6°F
28.7°F
83%
0.01 in
89%
0%
15.7 mph
0.9


Air Quality

AQI: 1 - Good
PM2.5: 2.21 μg/m3
PM10: 3.69 μg/m3
Carbon Monoxide: 145.56 μg/m3
Nitrogen Dioxide: 1.01 μg/m3
Sulphur Dioxide: 1 μg/m3
Ozone: 102.16 μg/m3

Astronomical

Sunrise: 6:32 AM
Sun Transit: 1:03 PM
Sunset: 7:37 PM
Daylight: 13 hrs 5 mins
Moonrise: 12:03 AM
Moon Transit: 3:21 AM
Moonset: 7:32 AM
Moon Phase: Waning Gibbous
Moon Illumination: 83.9%

Best Times for Fishing or Hunting

Major Periods

2:51 AM - 5:21 AM
3:12 PM - 5:42 PM

Minor Periods

7:02 AM - 8:32 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Monday, April 6, 2026

Weather Forecast

Light freezing rain
29.3°F
11.8°F
25.8°F
81%
0.02 in
89%
36%
18.8 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 2.89 μg/m3
PM10: 4.67 μg/m3
Carbon Monoxide: 141.02 μg/m3
Nitrogen Dioxide: 1.3 μg/m3
Sulphur Dioxide: 0.95 μg/m3
Ozone: 98.15 μg/m3

Astronomical

Sunrise: 6:30 AM
Sun Transit: 1:03 PM
Sunset: 7:38 PM
Daylight: 13 hrs 9 mins
Moonrise: 12:11 AM
Moon Transit: 4:09 AM
Moonset: 8:03 AM
Moon Phase: Waning Gibbous
Moon Illumination: 74.7%

Best Times for Fishing or Hunting

Major Periods

3:39 AM - 6:09 AM
4:02 PM - 6:32 PM

Minor Periods

7:33 AM - 9:03 AM
12:00 AM - 12:00 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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