Water Temperature of the St. Marys River in Sault Ste. Marie, MI

Current Water Temperature

59.5°F

Measurement Time: Wednesday, July 22, 2026, 1:00 AM EDT

Temperature Locations

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Local Points of Interest

Rotary Park; Rotary Island; Steers Island; Island Number One; Sault Sainte Marie

St. Marys River

Station Name: Little Rapids
Data Source: NOAA Tides and Currents

Elevation Above Sea Level: 568 feet

Sensor Depth: -8 feet

Nearest Address:
1425 Riverside Dr
Sault Ste. Marie, MI 49783
Chippewa County

GPS Coordinates: 46.485832, -84.301666

Nearby Water Temperatures

St. Marys River, Sault Ste. Marie, MI (3.5 mi)
St. Marys River, Barbeau, MI (14.5 mi)
St. Marys River, Barbeau, MI (16.2 mi)
Lake Huron, De Tour Village, MI (39.2 mi)
Lake Huron, Bois Blanc Island, MI (49.9 mi)
Straits of Mackinac, Mackinaw City, MI (50.9 mi)
Seul Choix Bay, Port Inland, MI (83.1 mi)
Little Traverse Bay, Petoskey, MI (83.7 mi)
Lake Huron, Alpena, MI (105.3 mi)
Miners River, Munising, MI (106.5 mi)
Thunder Bay River, Alpena, MI (106.9 mi)
Lake Huron, Alpena, MI (114.8 mi)
North Branch Au Sable River, Grayling, MI (122.4 mi)
Au Sable River, Luzerne, MI (125 mi)
Au Sable River, Mio, MI (126.4 mi)

Weather for Sault Ste. Marie, Michigan

Current Weather

54°F
Partly cloudy
Partly cloudy
50.1°F
52°F
86%
NW 13 mph
18.4 mph
48.8°F
45.8°F
0 in
75%
9 mi
1009 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 68°F
L: 52°F
Sunny
Thu
H: 74°F
L: 50°F
Sunny
Fri
H: 80°F
L: 55°F
Sunny
Sat
H: 76°F
L: 57°F
Fog
Sun
H: 77°F
L: 62°F

Air Quality

AQI: 1 - Good
PM2.5: 5.3 μg/m3
PM10: 5.5 μg/m3
Carbon Monoxide: 100 μg/m3
Nitrogen Dioxide: 1.4 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 75 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 1:43 PM
Sunset: 9:20 PM
Daylight: 15 hrs 13 mins
Moonrise: 3:58 PM
Moon Transit: 8:28 PM
Moonset: 12:28 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

8:22 AM - 10:52 AM
7:58 PM - 10:28 PM

Minor Periods

3:28 PM - 4:58 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Small Craft Advisory issued July 21 at 2:45PM EDT until July 22 at 11:00PM EDT by NWS Gaylord MI

Effective: Tue July 21, 2026, 2:45 PM
Expires: Tue July 21, 2026, 10:45 PM

* WHAT...Highest gusts up to 30 kts from the northwest and highest waves around 10 feet. * WHERE...Whitefish Bay (U. S. Portion)/Whitefish Point to Point Iroquois MI and St. Marys River Point Iroquois to E. Potagannissing Bay. * WHEN...Until 11 PM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.


Small Craft Advisory issued July 21 at 5:46PM EDT until July 22 at 11:00PM EDT by NWS Gaylord MI

Effective: Tue July 21, 2026, 5:46 PM
Expires: Wed July 22, 2026, 2:00 AM

* WHAT...Highest gusts up to 30 kts from the northwest and highest waves around 8 feet. * WHERE...Whitefish Bay (U. S. Portion)/Whitefish Point to Point Iroquois MI and St. Marys River Point Iroquois to E. Potagannissing Bay. * WHEN...Until 11 PM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.


Small Craft Advisory issued July 21 at 10:37PM EDT until July 22 at 11:00PM EDT by NWS Gaylord MI

Effective: Tue July 21, 2026, 10:37 PM
Expires: Wed July 22, 2026, 6:45 AM

* WHAT...Highest gusts up to 30 kts from the northwest and highest waves around 8 feet. * WHERE...Whitefish Bay (U. S. Portion)/Whitefish Point to Point Iroquois MI and St. Marys River Point Iroquois to E. Potagannissing Bay. * WHEN...Until 11 PM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Wednesday, July 22, 2026

Weather Forecast

Sunny
68°F
52°F
58°F
68%
0 in
5%
0%
16.3 mph
6.5


Air Quality

AQI: 1 - Good
PM2.5: 4.33 μg/m3
PM10: 4.58 μg/m3
Carbon Monoxide: 100.46 μg/m3
Nitrogen Dioxide: 1.21 μg/m3
Sulphur Dioxide: 0.37 μg/m3
Ozone: 69.88 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 1:43 PM
Sunset: 9:20 PM
Daylight: 15 hrs 13 mins
Moonrise: 3:58 PM
Moon Transit: 8:28 PM
Moonset: 12:28 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

8:22 AM - 10:52 AM
7:58 PM - 10:28 PM

Minor Periods

3:28 PM - 4:58 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, July 23, 2026

Weather Forecast

Sunny
73.6°F
49.6°F
61.4°F
64%
0 in
5%
0%
9.4 mph
7.1


Air Quality

AQI: 1 - Good
PM2.5: 3.55 μg/m3
PM10: 3.79 μg/m3
Carbon Monoxide: 112.71 μg/m3
Nitrogen Dioxide: 1.88 μg/m3
Sulphur Dioxide: 0.51 μg/m3
Ozone: 71.08 μg/m3

Astronomical

Sunrise: 6:08 AM
Sun Transit: 1:43 PM
Sunset: 9:19 PM
Daylight: 15 hrs 11 mins
Moonrise: 5:06 PM
Moon Transit: 9:16 PM
Moonset: 12:52 AM
Moon Phase: First Quarter
Moon Illumination: 66.1%

Best Times for Fishing or Hunting

Major Periods

9:09 AM - 11:39 AM
8:46 PM - 11:16 PM

Minor Periods

4:36 PM - 6:06 PM
12:22 AM - 1:52 AM

Action Rating: 2 out of 5

Friday, July 24, 2026

Weather Forecast

Sunny
79.9°F
54.6°F
66.8°F
68%
0 in
5%
0%
13 mph
7.1


Air Quality

AQI: 1 - Good
PM2.5: 4.39 μg/m3
PM10: 4.53 μg/m3
Carbon Monoxide: 124.58 μg/m3
Nitrogen Dioxide: 1.79 μg/m3
Sulphur Dioxide: 0.5 μg/m3
Ozone: 90.29 μg/m3

Astronomical

Sunrise: 6:09 AM
Sun Transit: 1:43 PM
Sunset: 9:18 PM
Daylight: 15 hrs 9 mins
Moonrise: 6:10 PM
Moon Transit: 10:06 PM
Moonset: 1:22 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

9:58 AM - 12:28 AM
12:00 AM - 12:00 AM

Minor Periods

5:40 PM - 7:10 PM
12:52 AM - 2:22 AM

Action Rating: 3 out of 5

Saturday, July 25, 2026

Weather Forecast

Sunny
76.2°F
56.6°F
66.4°F
79%
0.19 in
71%
0%
14.1 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 5.13 μg/m3
PM10: 5.28 μg/m3
Carbon Monoxide: 134.38 μg/m3
Nitrogen Dioxide: 2.04 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 99.17 μg/m3

Astronomical

Sunrise: 6:10 AM
Sun Transit: 1:43 PM
Sunset: 9:17 PM
Daylight: 15 hrs 6 mins
Moonrise: 7:07 PM
Moon Transit: 10:57 PM
Moonset: 2:00 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.2%

Best Times for Fishing or Hunting

Major Periods

10:49 AM - 1:19 PM
12:00 AM - 12:00 AM

Minor Periods

6:37 PM - 8:07 PM
1:30 AM - 3:00 AM

Action Rating: 2 out of 5

Sunday, July 26, 2026

Weather Forecast

Fog
76.6°F
62.1°F
69°F
94%
0.07 in
82%
0%
7.2 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 5.82 μg/m3
PM10: 5.91 μg/m3
Carbon Monoxide: 182.78 μg/m3
Nitrogen Dioxide: 2.89 μg/m3
Sulphur Dioxide: 0.76 μg/m3
Ozone: 91.11 μg/m3

Astronomical

Sunrise: 6:11 AM
Sun Transit: 1:43 PM
Sunset: 9:15 PM
Daylight: 15 hrs 4 mins
Moonrise: 7:56 PM
Moon Transit: 11:49 PM
Moonset: 2:48 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.3%

Best Times for Fishing or Hunting

Major Periods

11:40 AM - 2:10 PM
12:00 AM - 12:00 AM

Minor Periods

7:26 PM - 8:56 PM
2:18 AM - 3:48 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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