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Lake St. Clair

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 04 September 2026

Today Tonight and Saturday.

Wind light becoming northeast 10 knots near midnight. Wind northeast 10 Saturday.

Scattered showers ending near midnight with a risk of thunderstorms.

Waves

Issued 03:00 AM EDT 04 September 2026
Today Tonight and Saturday. Waves 0.5 metres or less.

Extended Forecast

Issued 03:00 AM EDT 04 September 2026
Sunday Wind light.
Monday Wind light.
Tuesday 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
Legend:
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land station Land Station
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 07:55 AM EDT 04 September 2026 Conditions are favourable for the development of squalls with wind gusts up to 35 knots and frequent lightning.

Thunderstorms approaching from Michigan will move across the lake this morning.

Vessels without lightning protection should make their way to shore immediately. 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 3:00 AM EDT 4 September 2026 Today Tonight and Saturday At 3:00 a.m. EDT today low 1009 mb located over southern Quebec.
By 3:00 a.m. EDT Saturday low 998 mb located east of Nova Scotia.

At 3:00 a.m. EDT today ridge located on a line northwest-southeast
over Sault Ste. Marie.
By 3:00 a.m. EDT Saturday ridge located on a line
northwest-southeast over Georgian Bay.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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