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Lake St. Clair

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 11 August 2026

Today Tonight and Wednesday.

Wind light becoming southwest 10 knots near noon then becoming light this evening. Wind light Wednesday.

Scattered showers this afternoon and this evening with a risk of thunderstorms. Scattered showers Wednesday afternoon and evening with a risk of thunderstorms.

Waves

Issued 10:30 AM EDT 11 August 2026
Today Tonight and Wednesday. Waves less than 0.5 metres.

Extended Forecast

Issued 03:00 AM EDT 11 August 2026
Thursday Wind light becoming northeast 15 knots late in the day.
Friday Wind northeast 15 knots.
Saturday Wind light.

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Map of Great Lakes - Lake Huron marine weather areas Erieau CFB Trenton Muskoka Airport Parry Sound Harbour Toronto City Centre Airport Lake Simcoe Regional Airport Wiarton Airport Point Petre Lagoon City Western Islands Cobourg Port Colborne Windsor Airport Point Pelee Welland-Pelham Vineland Station Burlington Lift Bridge Southeast Shoal St. Catharines / Niagara District Airport Goderich Port Weller Long Point Harrow AAFC Hamilton Munro Int'l Airport Tobermory Sarnia Chris Hadfield Airport Oshawa Executive Airport Collingwood Port Stanley - 45132 Prince Edward Point - 45135 Georgian Bay - 45137 Grimsby - 45139 Port Colborne - 45142 South Georgian Bay - 45143 Lake St Clair - 45147 South Lake Huron - 45149 Lake Simcoe - 45151 Lake Nipissing - 45152 North Channel - 45154 Ajax - 45159 Sault Ste. Marie Airport Killarney Greater Sudbury Airport North Bay Airport Gore Bay-Manitoulin Airport Peterborough Municipal Airport Brockville Grenadier Island Kingston Airport
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Ice Conditions

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 17 May 2026 Forecasts have ended for the season.
Warnings

Watches (In effect)

Squall watch in effect

Lake St. Clair

Issued 12:47 PM EDT 11 August 2026 Conditions are favourable for the development of squalls with wind gusts up to 40 knots and frequent lightning.

Thunderstorms over Lower Michigan could move over the area later this afternoon.

Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 11 August 2026 Today Tonight and Wednesday At 10:30 a.m. EDT today quasi-stationary trough located on a line
east-west over Iowa.

At 10:30 a.m. EDT today quasi-stationary ridge located on a line
northwest-southeast over Lake Superior.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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