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

Current Water Temperature

41.9°F

Measurement Time: Friday, May 22, 2026, 4:30 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

39°F
Clear
Clear
36.4°F
39.4°F
79%
ENE 3.8 mph
8 mph
36.9°F
23.5°F
0 in
0%
9 mi
1029 mbar
0

Five Day Weather Forecast

Sunny
Fri
H: 66°F
L: 38°F
Partly Cloudy
Sat
H: 63°F
L: 42°F
Patchy rain nearby
Sun
H: 51°F
L: 47°F
Cloudy
Mon
H: 71°F
L: 43°F
Patchy rain nearby
Tue
H: 78°F
L: 49°F

Air Quality

AQI: 1 - Good
PM2.5: 1.85 μg/m3
PM10: 1.85 μg/m3
Carbon Monoxide: 139.85 μg/m3
Nitrogen Dioxide: 4.35 μg/m3
Sulphur Dioxide: 1.45 μg/m3
Ozone: 48 μg/m3

Astronomical

Sunrise: 5:56 AM
Sun Transit: 1:33 PM
Sunset: 9:12 PM
Daylight: 15 hrs 17 mins
Moonrise: 12:07 AM
Moon Transit: 7:28 PM
Moonset: 2:11 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

7:20 AM - 9:50 AM
6:58 PM - 9:28 PM

Minor Periods

11:37 AM - 1:07 PM
1:41 AM - 3:11 AM

Action Rating: 3 out of 5

Frost Advisory issued May 21 at 3:20PM EDT until May 22 at 8:00AM EDT by NWS Gaylord MI

Effective: Thu May 21, 2026, 3:20 PM
Expires: Fri May 22, 2026, 3:30 AM

* WHAT...Temperatures of 32 to 34 degrees will result in frost formation. Localized pockets of temperatures below 30 degrees are possible. * WHERE...Portions of Eastern Upper and Northern Lower Michigan. * WHEN...From midnight tonight to 8 AM EDT Friday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Where winds become light overnight, a near-surface temperature inversion is possible. Temperature inversions are less likely across northwest Lower Michigan, where winds are expected to stay breezy through the night.

Take steps now to protect tender plants from the cold.


Frost Advisory issued May 21 at 10:27PM EDT until May 22 at 8:00AM EDT by NWS Gaylord MI

Effective: Thu May 21, 2026, 10:27 PM
Expires: Fri May 22, 2026, 8:00 AM

* WHAT...Temperatures of 32 to 34 degrees will result in frost formation. Localized pockets of temperatures below 30 degrees are possible. * WHERE...Portions of Eastern Upper and Northern Lower Michigan. * WHEN...Until 8 AM EDT Friday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Where winds become light overnight, a near-surface temperature inversion is possible. Temperature inversions are less likely across northwest Lower Michigan, where winds are expected to stay breezy through the night.

Take steps now to protect tender plants from the cold.
Friday, May 22, 2026

Weather Forecast

Sunny
65.5°F
38.3°F
50.5°F
51%
0 in
0%
0%
11.6 mph
6.6


Air Quality

AQI: 1 - Good
PM2.5: 3.67 μg/m3
PM10: 4.05 μg/m3
Carbon Monoxide: 142.29 μg/m3
Nitrogen Dioxide: 4.32 μg/m3
Sulphur Dioxide: 1.39 μg/m3
Ozone: 64.28 μg/m3

Astronomical

Sunrise: 5:56 AM
Sun Transit: 1:33 PM
Sunset: 9:12 PM
Daylight: 15 hrs 17 mins
Moonrise: 12:07 AM
Moon Transit: 7:28 PM
Moonset: 2:11 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

7:20 AM - 9:50 AM
6:58 PM - 9:28 PM

Minor Periods

11:37 AM - 1:07 PM
1:41 AM - 3:11 AM

Action Rating: 3 out of 5

Saturday, May 23, 2026

Weather Forecast

Partly Cloudy
63.4°F
42.1°F
53.2°F
65%
0 in
0%
0%
18.3 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 4.88 μg/m3
PM10: 5.31 μg/m3
Carbon Monoxide: 129.61 μg/m3
Nitrogen Dioxide: 2.36 μg/m3
Sulphur Dioxide: 1.21 μg/m3
Ozone: 78.12 μg/m3

Astronomical

Sunrise: 5:55 AM
Sun Transit: 1:34 PM
Sunset: 9:14 PM
Daylight: 15 hrs 19 mins
Moonrise: 1:23 PM
Moon Transit: 8:14 PM
Moonset: 2:33 AM
Moon Phase: First Quarter
Moon Illumination: 44.4%

Best Times for Fishing or Hunting

Major Periods

8:08 AM - 10:38 AM
7:44 PM - 10:14 PM

Minor Periods

12:53 AM - 2:23 PM
2:03 AM - 3:33 AM

Action Rating: 2 out of 5

Sunday, May 24, 2026

Weather Forecast

Patchy rain nearby
50.6°F
47.4°F
48.7°F
89%
0.02 in
88%
0%
13.9 mph
5.4


Air Quality

AQI: 1 - Good
PM2.5: 3.22 μg/m3
PM10: 3.29 μg/m3
Carbon Monoxide: 136.09 μg/m3
Nitrogen Dioxide: 2.92 μg/m3
Sulphur Dioxide: 1.5 μg/m3
Ozone: 73.32 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 1:34 PM
Sunset: 9:15 PM
Daylight: 15 hrs 21 mins
Moonrise: 2:35 PM
Moon Transit: 8:57 PM
Moonset: 2:51 AM
Moon Phase: First Quarter
Moon Illumination: 55.7%

Best Times for Fishing or Hunting

Major Periods

8:53 AM - 11:23 AM
8:27 PM - 10:57 PM

Minor Periods

2:05 PM - 3:35 PM
2:21 AM - 3:51 AM

Action Rating: 2 out of 5

Monday, May 25, 2026

Weather Forecast

Cloudy
71.1°F
43.2°F
56.4°F
82%
0 in
0%
0%
9.4 mph
7.3


Air Quality

AQI: 1 - Good
PM2.5: 4.38 μg/m3
PM10: 4.55 μg/m3
Carbon Monoxide: 150.47 μg/m3
Nitrogen Dioxide: 3.65 μg/m3
Sulphur Dioxide: 1.5 μg/m3
Ozone: 70.16 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:34 PM
Sunset: 9:16 PM
Daylight: 15 hrs 23 mins
Moonrise: 3:44 PM
Moon Transit: 9:39 PM
Moonset: 3:07 AM
Moon Phase: First Quarter
Moon Illumination: 66.7%

Best Times for Fishing or Hunting

Major Periods

9:35 AM - 12:05 AM
9:09 PM - 11:39 PM

Minor Periods

3:14 PM - 4:44 PM
2:37 AM - 4:07 AM

Action Rating: 3 out of 5

Tuesday, May 26, 2026

Weather Forecast

Patchy rain nearby
78.3°F
48.7°F
59.4°F
88%
0.1 in
88%
0%
7.6 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 7.4 μg/m3
PM10: 7.73 μg/m3
Carbon Monoxide: 179.47 μg/m3
Nitrogen Dioxide: 8.01 μg/m3
Sulphur Dioxide: 1.73 μg/m3
Ozone: 45.15 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 1:34 PM
Sunset: 9:17 PM
Daylight: 15 hrs 25 mins
Moonrise: 4:53 PM
Moon Transit: 10:21 PM
Moonset: 3:23 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.9%

Best Times for Fishing or Hunting

Major Periods

10:17 AM - 12:47 AM
12:00 AM - 12:00 AM

Minor Periods

4:23 PM - 5:53 PM
2:53 AM - 4:23 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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