Water Temperature of the Grand Portage River in Grand Portage, MN

Current Water Temperature

32.4°F

Measurement Time: Wednesday, April 15, 2026, 1:15 PM CDT

Temperature Locations

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Local Points of Interest

Grand Portage Bay; Lake Superior

Grand Portage River

Station Name: GRAND PORTAGE RIVER AT GRAND PORTAGE MN
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 623 feet

Nearest Address:
1 Upper Rd
Grand Portage, MN 55605
Cook County

GPS Coordinates: 47.9634982, -89.6834233

Nearby Water Temperatures

Washington Creek, Windigo, MI (25 mi)
Lake Superior, Grand Marais, MN (33.3 mi)
Grand Marais Harbor, Grand Marais, MN (33.9 mi)
Lake Superior, Lake Superior, MI (43.7 mi)
Poplar River, Lutsen, MN (52.6 mi)
Lake Superior, Calumet, MI (69.3 mi)
Pilgrim River, Houghton, MI (80.5 mi)
Baptism River, Illgen City, MN (82.8 mi)
Kawishiwi River, Ely, MN (85.7 mi)
Lake Superior, Isle Royale, MI (90.4 mi)
Keweenaw Bay, Jacobsville, MI (91.2 mi)
West Branch Ontonagon River, Bergland, MI (95.2 mi)
Presque Isle River, Tula, MI (98 mi)
Sturgeon River, Pelkie, MI (98 mi)
Falls River, L'Anse, MI (102.8 mi)

Weather for Grand Portage, Minnesota

Current Weather

41.8°F
Mist
Mist
41.3°F
41.8°F
96%
N 2.9 mph
5.1 mph
41.3°F
41.4°F
0 in
99%
0 mi
1010 mbar
0.1

Five Day Weather Forecast

Mist
Wed
H: 44°F
L: 37°F
Fog
Thu
H: 41°F
L: 36°F
Moderate rain
Fri
H: 40°F
L: 31°F
Partly Cloudy
Sat
H: 28°F
L: 21°F
Cloudy
Sun
H: 36°F
L: 20°F

Air Quality

AQI: 1 - Good
PM2.5: 6.55 μg/m3
PM10: 7.55 μg/m3
Carbon Monoxide: 164.85 μg/m3
Nitrogen Dioxide: 6.55 μg/m3
Sulphur Dioxide: 1.85 μg/m3
Ozone: 77 μg/m3

Astronomical

Sunrise: 6:09 AM
Sun Transit: 12:58 AM
Sunset: 7:49 PM
Daylight: 13 hrs 40 mins
Moonrise: 5:11 AM
Moon Transit: 10:33 AM
Moonset: 5:56 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

10:03 AM - 12:33 AM
10:03 AM - 12:33 AM

Minor Periods

5:26 PM - 6:56 PM
4:41 AM - 6:11 AM

Action Rating: 3 out of 5

Dense Fog Advisory issued April 15 at 1:03PM CDT until April 16 at 10:00AM CDT by NWS Duluth MN

Effective: Wed April 15, 2026, 1:03 PM
Expires: Thu April 16, 2026, 5:00 AM

* WHAT...Visibility one quarter mile or less in dense fog. * WHERE...In Minnesota, Carlton and South St. Louis, Southern Cook and Southern Lake Counties. In Wisconsin, Ashland, Bayfield, Douglas, and Iron Counties. This includes the Tribal Lands of the Fond du Lac Band, the northwestern area of the Lac du Flambeau Band, the Grand Portage Reservation, the Bad River Reservation and the Red Cliff Band. Other locations including Madeline Island and the Apostle Islands National Lakeshore. * WHEN...From 10 PM this evening to 10 AM CDT Thursday. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Fog will develop tonight around Lake Superior and will be dense overnight. Visibility will improve Thursday morning.

If driving, slow down, use your low-beam headlights and fog lights, and leave plenty of distance ahead of you.
Wednesday, April 15, 2026

Weather Forecast

Mist
43.5°F
36.7°F
39.8°F
96%
0 in
0%
0%
3.4 mph
0.8


Air Quality

AQI: 1 - Good
PM2.5: 4.49 μg/m3
PM10: 5.69 μg/m3
Carbon Monoxide: 162.45 μg/m3
Nitrogen Dioxide: 3.84 μg/m3
Sulphur Dioxide: 1.94 μg/m3
Ozone: 83.36 μg/m3

Astronomical

Sunrise: 6:09 AM
Sun Transit: 12:58 AM
Sunset: 7:49 PM
Daylight: 13 hrs 40 mins
Moonrise: 5:11 AM
Moon Transit: 10:33 AM
Moonset: 5:56 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

10:03 AM - 12:33 AM
10:03 AM - 12:33 AM

Minor Periods

5:26 PM - 6:56 PM
4:41 AM - 6:11 AM

Action Rating: 3 out of 5

Thursday, April 16, 2026

Weather Forecast

Fog
40.5°F
35.5°F
38.6°F
98%
0 in
0%
0%
8.9 mph
0.8


Air Quality

AQI: 1 - Good
PM2.5: 4.42 μg/m3
PM10: 5.25 μg/m3
Carbon Monoxide: 159.29 μg/m3
Nitrogen Dioxide: 3.98 μg/m3
Sulphur Dioxide: 1.57 μg/m3
Ozone: 78.2 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 12:58 AM
Sunset: 7:51 PM
Daylight: 13 hrs 43 mins
Moonrise: 5:28 AM
Moon Transit: 12:13 AM
Moonset: 7:18 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:43 AM - 2:13 PM

Minor Periods

6:48 PM - 8:18 PM
4:58 AM - 6:28 AM

Action Rating: 5 out of 5

Friday, April 17, 2026

Weather Forecast

Moderate rain
40.3°F
31.1°F
36.4°F
95%
0.26 in
82%
6%
14.3 mph
0.8


Air Quality

AQI: 1 - Good
PM2.5: 5.5 μg/m3
PM10: 6.61 μg/m3
Carbon Monoxide: 153.21 μg/m3
Nitrogen Dioxide: 2.91 μg/m3
Sulphur Dioxide: 1.42 μg/m3
Ozone: 88.32 μg/m3

Astronomical

Sunrise: 6:05 AM
Sun Transit: 12:58 AM
Sunset: 7:52 PM
Daylight: 13 hrs 47 mins
Moonrise: 5:47 AM
Moon Transit: 1:05 PM
Moonset: 8:45 PM
Moon Phase: New
Moon Illumination: 4.1%

Best Times for Fishing or Hunting

Major Periods

12:12 AM - 2:42 AM
12:35 AM - 3:05 PM

Minor Periods

8:15 PM - 9:45 PM
5:17 AM - 6:47 AM

Action Rating: 4 out of 5

Saturday, April 18, 2026

Weather Forecast

Partly Cloudy
28.4°F
21.4°F
25.2°F
63%
0 in
0%
0%
19 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 1.93 μg/m3
PM10: 2.13 μg/m3
Carbon Monoxide: 153.7 μg/m3
Nitrogen Dioxide: 1.61 μg/m3
Sulphur Dioxide: 1.06 μg/m3
Ozone: 83.88 μg/m3

Astronomical

Sunrise: 6:04 AM
Sun Transit: 12:58 AM
Sunset: 7:54 PM
Daylight: 13 hrs 50 mins
Moonrise: 6:11 AM
Moon Transit: 2:02 PM
Moonset: 10:13 PM
Moon Phase: New
Moon Illumination: 1.2%

Best Times for Fishing or Hunting

Major Periods

1:06 AM - 3:36 AM
1:32 PM - 4:02 PM

Minor Periods

9:43 PM - 11:13 PM
5:41 AM - 7:11 AM

Action Rating: 4 out of 5

Sunday, April 19, 2026

Weather Forecast

Cloudy
35.8°F
19.9°F
27.6°F
52%
0 in
0%
0%
16.1 mph
1.1


Air Quality

AQI: 1 - Good
PM2.5: 1.95 μg/m3
PM10: 2.33 μg/m3
Carbon Monoxide: 163.25 μg/m3
Nitrogen Dioxide: 1.1 μg/m3
Sulphur Dioxide: 1.01 μg/m3
Ozone: 89.92 μg/m3

Astronomical

Sunrise: 6:02 AM
Sun Transit: 12:57 AM
Sunset: 7:55 PM
Daylight: 13 hrs 53 mins
Moonrise: 6:43 AM
Moon Transit: 3:03 PM
Moonset: 11:39 PM
Moon Phase: Waxing Crescent
Moon Illumination: 4.9%

Best Times for Fishing or Hunting

Major Periods

2:05 AM - 4:35 AM
2:33 PM - 5:03 PM

Minor Periods

12:00 AM - 12:00 AM
6:13 AM - 7:43 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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