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

Current Water Temperature

32.0°F

Measurement Time: Wednesday, August 5, 2026, 2:55 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

69.8°F
Sunny
Sunny
65.1°F
69.8°F
44%
SSW 6.9 mph
12.2 mph
69.8°F
46.8°F
0 in
0%
6 mi
1014 mbar
0.3

Five Day Weather Forecast

Sunny
Wed
H: 71°F
L: 53°F
Sunny
Thu
H: 75°F
L: 59°F
Patchy rain nearby
Fri
H: 70°F
L: 59°F
Sunny
Sat
H: 72°F
L: 54°F
Sunny
Sun
H: 70°F
L: 55°F

Air Quality

AQI: 1 - Good
PM2.5: 12.4 μg/m3
PM10: 12.7 μg/m3
Carbon Monoxide: 106 μg/m3
Nitrogen Dioxide: 1.5 μg/m3
Sulphur Dioxide: 0.5 μg/m3
Ozone: 92 μg/m3

Astronomical

Sunrise: 5:40 AM
Sun Transit: 1:04 PM
Sunset: 8:28 PM
Daylight: 14 hrs 48 mins
Moonrise: 11:02 PM
Moon Transit: 6:06 AM
Moonset: 1:53 PM
Moon Phase: Last Quarter
Moon Illumination: 43.2%

Best Times for Fishing or Hunting

Major Periods

5:36 AM - 8:06 AM
6:05 PM - 8:35 PM

Minor Periods

12:00 AM - 12:00 AM
1:23 PM - 2:53 PM

Action Rating: 4 out of 5

Small Craft Advisory issued August 5 at 4:22PM CDT until August 7 at 4:00PM CDT by NWS Duluth MN

Effective: Wed August 5, 2026, 4:22 PM
Expires: Thu August 6, 2026, 10:00 AM

* WHAT...Southwest winds 10 to 15 knots gusting to 30 knots. Waves 2 to 4 ft expected. * WHERE...Grand Portage to Grand Marais MN. * WHEN...From 10 AM Thursday to 4 PM CDT Friday. * IMPACTS...Conditions will be hazardous to small craft.

Anyone operating a smaller vessel should avoid navigating in hazardous conditions.
Wednesday, August 5, 2026

Weather Forecast

Sunny
70.9°F
53.1°F
62.8°F
55%
0 in
3%
0%
11.9 mph
6.5


Air Quality

AQI: 1 - Good
PM2.5: 9.6 μg/m3
PM10: 9.86 μg/m3
Carbon Monoxide: 108.83 μg/m3
Nitrogen Dioxide: 1.11 μg/m3
Sulphur Dioxide: 0.35 μg/m3
Ozone: 72.67 μg/m3

Astronomical

Sunrise: 5:40 AM
Sun Transit: 1:04 PM
Sunset: 8:28 PM
Daylight: 14 hrs 48 mins
Moonrise: 11:02 PM
Moon Transit: 6:06 AM
Moonset: 1:53 PM
Moon Phase: Last Quarter
Moon Illumination: 43.2%

Best Times for Fishing or Hunting

Major Periods

5:36 AM - 8:06 AM
6:05 PM - 8:35 PM

Minor Periods

12:00 AM - 12:00 AM
1:23 PM - 2:53 PM

Action Rating: 4 out of 5

Thursday, August 6, 2026

Weather Forecast

Sunny
74.9°F
59.4°F
67.4°F
52%
0 in
3%
0%
14.1 mph
6.2


Air Quality

AQI: 1 - Good
PM2.5: 10.81 μg/m3
PM10: 11.11 μg/m3
Carbon Monoxide: 110.42 μg/m3
Nitrogen Dioxide: 1.3 μg/m3
Sulphur Dioxide: 0.66 μg/m3
Ozone: 93.33 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 1:04 PM
Sunset: 8:27 PM
Daylight: 14 hrs 45 mins
Moonrise: 12:02 AM
Moon Transit: 7:00 AM
Moonset: 3:15 PM
Moon Phase: Last Quarter
Moon Illumination: 32.3%

Best Times for Fishing or Hunting

Major Periods

6:30 AM - 9:00 AM
7:01 PM - 9:31 PM

Minor Periods

2:45 PM - 4:15 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Friday, August 7, 2026

Weather Forecast

Patchy rain nearby
70.4°F
59°F
65.7°F
78%
0.1 in
66%
0%
11 mph
5.7


Air Quality

AQI: 1 - Good
PM2.5: 6.82 μg/m3
PM10: 7.05 μg/m3
Carbon Monoxide: 121.38 μg/m3
Nitrogen Dioxide: 1.77 μg/m3
Sulphur Dioxide: 0.48 μg/m3
Ozone: 83.08 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 1:04 PM
Sunset: 8:25 PM
Daylight: 14 hrs 42 mins
Moonrise: 12:34 AM
Moon Transit: 7:58 AM
Moonset: 4:36 PM
Moon Phase: Last Quarter
Moon Illumination: 22.2%

Best Times for Fishing or Hunting

Major Periods

7:28 AM - 9:58 AM
8:02 PM - 10:32 PM

Minor Periods

4:06 PM - 5:36 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Saturday, August 8, 2026

Weather Forecast

Sunny
71.9°F
54.4°F
63.3°F
63%
0.01 in
17%
0%
11 mph
6.7


Air Quality

AQI: 1 - Good
PM2.5: 2.68 μg/m3
PM10: 2.71 μg/m3
Carbon Monoxide: 126.53 μg/m3
Nitrogen Dioxide: 0.83 μg/m3
Sulphur Dioxide: 0.33 μg/m3
Ozone: 69.29 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 1:04 PM
Sunset: 8:24 PM
Daylight: 14 hrs 39 mins
Moonrise: 12:19 AM
Moon Transit: 9:01 AM
Moonset: 5:48 PM
Moon Phase: Waning Crescent
Moon Illumination: 13.6%

Best Times for Fishing or Hunting

Major Periods

8:31 AM - 11:01 AM
9:06 PM - 11:36 PM

Minor Periods

5:18 PM - 6:48 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Sunday, August 9, 2026

Weather Forecast

Sunny
70.3°F
54.9°F
63°F
66%
0.01 in
36%
0%
8.5 mph
6.3


Air Quality

AQI: 1 - Good
PM2.5: 2.75 μg/m3
PM10: 2.8 μg/m3
Carbon Monoxide: 154.75 μg/m3
Nitrogen Dioxide: 0.73 μg/m3
Sulphur Dioxide: 0.33 μg/m3
Ozone: 63.5 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 1:04 PM
Sunset: 8:22 PM
Daylight: 14 hrs 36 mins
Moonrise: 1:20 AM
Moon Transit: 10:06 AM
Moonset: 6:46 PM
Moon Phase: Waning Crescent
Moon Illumination: 6.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:36 AM - 12:06 AM

Minor Periods

6:16 PM - 7:46 PM
12:50 AM - 2:20 AM

Action Rating: 2 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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