Water Temperature of the St. Clair River in Algonac, MI

Current Water Temperature

49.8°F

Measurement Time: Monday, May 18, 2026, 11:54 AM EDT

Temperature Locations

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Local Points of Interest

Russell Island; Walpole Island

St. Clair River

Station Name: Algonac
Data Source: NOAA Tides and Currents

Elevation Above Sea Level: 571 feet

Sensor Depth: -6 feet

Nearest Address:
1530 Saint Clair River Dr
Algonac, MI 48001
St. Clair County

GPS Coordinates: 42.621113, -82.526665

Nearby Water Temperatures

Clinton River, Mt. Clemens, MI (19.5 mi)
Clinton River, Sterling Heights, MI (25.4 mi)
Lake Huron, Lakeport, MI (35.8 mi)
Detroit River, Detroit, MI (36.7 mi)
River Rouge, Detroit, MI (40.9 mi)
Lower River Rouge, Dearborn, MI (42.9 mi)
River Raisin, Monroe, MI (68.7 mi)
Lake Erie, Marblehead, OH (75.2 mi)
Lake Huron, Harbor Beach, MI (84.9 mi)
Grand River, Fairport Harbor, OH (87.2 mi)
Lake Erie, Cleveland, OH (87.5 mi)
Shiawassee River, Saginaw, MI (89.2 mi)
Saginaw River, Saginaw, MI (90.8 mi)
Tittabawassee River, Freeland, MI (102 mi)
Lake Huron, Port Austin, MI (115 mi)

Weather for Algonac, Michigan

Current Weather

82.9°F
Sunny
Sunny
83.4°F
91.8°F
54%
SSW 16.6 mph
27.7 mph
88.5°F
65.1°F
0 in
25%
9 mi
1014 mbar
7.4

Five Day Weather Forecast

Moderate rain
Mon
H: 94°F
L: 65°F
Moderate rain
Tue
H: 77°F
L: 62°F
Patchy rain nearby
Wed
H: 53°F
L: 42°F
Sunny
Thu
H: 60°F
L: 40°F
Patchy rain nearby
Fri
H: 63°F
L: 44°F

Air Quality

AQI: 1 - Good
PM2.5: 7.55 μg/m3
PM10: 8.95 μg/m3
Carbon Monoxide: 151.85 μg/m3
Nitrogen Dioxide: 3.75 μg/m3
Sulphur Dioxide: 3.35 μg/m3
Ozone: 114 μg/m3

Astronomical

Sunrise: 6:05 AM
Sun Transit: 1:26 PM
Sunset: 8:49 PM
Daylight: 14 hrs 44 mins
Moonrise: 7:08 AM
Moon Transit: 3:25 PM
Moonset: 11:44 PM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

3:24 AM - 5:54 AM
2:55 PM - 5:25 PM

Minor Periods

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

Action Rating: 4 out of 5

yellow warning - heat - in effect

Service Notice – April 2026: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For Spring 2026, changes are expected to include... 1) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard is tentatively set for June 2026 deployment. Data changes will appear in CAP following this deployment, 2) marine alerts will now be issued for smaller zone splits in certain areas of Atlantic and Pacific waters and 3) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – avril 2026: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour le printemps 2026, il y aura des changements incluant... 1) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique devrait être déployée provisoirement en juin 2026. Des changements de données apparaîtront dans le PAC à la suite de ce déploiement, 2) les alertes marines seront désormais émises pour des subdivisions de zones plus petites dans certaines régions des eaux de l’Atlantique et du Pacifique et 3) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/

Effective: Sun May 17, 2026, 4:19 PM
Expires: Mon May 18, 2026, 8:19 AM

The first heat event of the season will begin Monday afternoon and is expected to continue into Tuesday. What: Daytime highs of 30 to 32 degrees Celsius. Humidex values of 36 to 38. Overnight lows near 20 degrees Celsius. When: Beginning Monday afternoon and continuing into Tuesday. Ending Tuesday night. Additional Information: ### For more information: https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.html Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.

Take action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day. Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water. Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body. Drink water often and before you feel thirsty to replace fluids. Close blinds, or shades and open windows if outside is cooler than inside. Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park. Follow the advice of your region’s public health authority. Plan and schedule outdoor activities during the coolest parts of the day. Limit direct exposure to the sun and heat. Wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat. Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind.


yellow warning - heat - in effect

Service Notice – April 2026: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For Spring 2026, changes are expected to include... 1) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard is tentatively set for June 2026 deployment. Data changes will appear in CAP following this deployment, 2) marine alerts will now be issued for smaller zone splits in certain areas of Atlantic and Pacific waters and 3) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – avril 2026: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour le printemps 2026, il y aura des changements incluant... 1) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique devrait être déployée provisoirement en juin 2026. Des changements de données apparaîtront dans le PAC à la suite de ce déploiement, 2) les alertes marines seront désormais émises pour des subdivisions de zones plus petites dans certaines régions des eaux de l’Atlantique et du Pacifique et 3) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/

Effective: Mon May 18, 2026, 4:51 AM
Expires: Mon May 18, 2026, 8:51 PM

The first heat event of the season will begin this afternoon and is expected to continue into Tuesday. What: Daytime highs of 30 to 32 degrees Celsius. Humidex values of 36 to 38. Overnight lows near 20 degrees Celsius. When: Beginning this afternoon and continuing into Tuesday. Ending Tuesday night. Additional Information: ### For more information: https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.html Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.

Take action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day. Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water. Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body. Drink water often and before you feel thirsty to replace fluids. Close blinds, or shades and open windows if outside is cooler than inside. Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park. Follow the advice of your region’s public health authority. Plan and schedule outdoor activities during the coolest parts of the day. Limit direct exposure to the sun and heat. Wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat. Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind.


Monday, May 18, 2026

Weather Forecast

Moderate rain
93.9°F
64.9°F
76.6°F
63%
0.3 in
82%
0%
20.1 mph
8.6


Air Quality

AQI: 1 - Good
PM2.5: 8.75 μg/m3
PM10: 9.81 μg/m3
Carbon Monoxide: 164.53 μg/m3
Nitrogen Dioxide: 6.54 μg/m3
Sulphur Dioxide: 2.99 μg/m3
Ozone: 100.36 μg/m3

Astronomical

Sunrise: 6:05 AM
Sun Transit: 1:26 PM
Sunset: 8:49 PM
Daylight: 14 hrs 44 mins
Moonrise: 7:08 AM
Moon Transit: 3:25 PM
Moonset: 11:44 PM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

3:24 AM - 5:54 AM
2:55 PM - 5:25 PM

Minor Periods

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

Action Rating: 4 out of 5

Tuesday, May 19, 2026

Weather Forecast

Moderate rain
76.7°F
61.9°F
68.7°F
85%
0.48 in
85%
0%
17.7 mph
7.7


Air Quality

AQI: 1 - Good
PM2.5: 6.71 μg/m3
PM10: 7.39 μg/m3
Carbon Monoxide: 160.77 μg/m3
Nitrogen Dioxide: 7.1 μg/m3
Sulphur Dioxide: 2.7 μg/m3
Ozone: 84.84 μg/m3

Astronomical

Sunrise: 6:04 AM
Sun Transit: 1:26 PM
Sunset: 8:50 PM
Daylight: 14 hrs 46 mins
Moonrise: 8:17 AM
Moon Transit: 4:31 PM
Moonset: 12:44 AM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

4:31 AM - 7:01 AM
4:01 PM - 6:31 PM

Minor Periods

7:47 AM - 9:17 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, May 20, 2026

Weather Forecast

Patchy rain nearby
53.4°F
41.7°F
50.4°F
77%
0.12 in
88%
0%
15.4 mph
5.6


Air Quality

AQI: 1 - Good
PM2.5: 2.29 μg/m3
PM10: 2.33 μg/m3
Carbon Monoxide: 138.41 μg/m3
Nitrogen Dioxide: 4.91 μg/m3
Sulphur Dioxide: 2.18 μg/m3
Ozone: 67.8 μg/m3

Astronomical

Sunrise: 6:03 AM
Sun Transit: 1:26 PM
Sunset: 8:51 PM
Daylight: 14 hrs 48 mins
Moonrise: 9:34 AM
Moon Transit: 5:33 PM
Moonset: 12:39 AM
Moon Phase: Waxing Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

5:35 AM - 8:05 AM
5:03 PM - 7:33 PM

Minor Periods

9:04 AM - 10:34 AM
12:09 AM - 1:39 AM

Action Rating: 3 out of 5

Thursday, May 21, 2026

Weather Forecast

Sunny
60.2°F
40.1°F
49°F
65%
0 in
0%
0%
12.8 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 3.11 μg/m3
PM10: 3.31 μg/m3
Carbon Monoxide: 127.28 μg/m3
Nitrogen Dioxide: 4.05 μg/m3
Sulphur Dioxide: 2.49 μg/m3
Ozone: 76.6 μg/m3

Astronomical

Sunrise: 6:02 AM
Sun Transit: 1:26 PM
Sunset: 8:52 PM
Daylight: 14 hrs 50 mins
Moonrise: 10:53 AM
Moon Transit: 6:30 PM
Moonset: 1:21 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

6:34 AM - 9:04 AM
6:00 PM - 8:30 PM

Minor Periods

10:23 AM - 11:53 AM
12:51 AM - 2:21 AM

Action Rating: 3 out of 5

Friday, May 22, 2026

Weather Forecast

Patchy rain nearby
62.7°F
43.9°F
53.4°F
59%
0.05 in
60%
0%
18.1 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 6.4 μg/m3
PM10: 6.63 μg/m3
Carbon Monoxide: 166.9 μg/m3
Nitrogen Dioxide: 9.01 μg/m3
Sulphur Dioxide: 2.67 μg/m3
Ozone: 61.69 μg/m3

Astronomical

Sunrise: 6:01 AM
Sun Transit: 1:26 PM
Sunset: 8:53 PM
Daylight: 14 hrs 51 mins
Moonrise: 12:09 AM
Moon Transit: 7:20 PM
Moonset: 1:53 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

7:27 AM - 9:57 AM
6:50 PM - 9:20 PM

Minor Periods

11:39 AM - 1:09 PM
1:23 AM - 2:53 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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