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Lake St. Clair

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 12 December 2025

Today Tonight and Saturday.

Wind west 10 knots becoming light early this morning then becoming southwest 10 early this evening. Wind increasing to southwest 15 near midnight then veering to west 20 Saturday morning. Wind veering to northwest 15 Saturday evening.

Periods of snow overnight and Saturday morning. Visibility 1 mile or less in snow.

Waves

Issued 03:00 AM EST 12 December 2025
Today Tonight and Saturday. Waves 0.5 metres or less building to 0.5 to 1 near midnight.

Extended Forecast

Issued 03:00 AM EST 12 December 2025
Sunday Wind west 15 knots veering to northwest 20 in the morning.
Monday Wind northwest 15 knots backing to southwest 15.
Tuesday Wind southwest 20 knots diminishing to light.

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Map of Great Lakes - Lake Huron marine weather areas Cove Island Goderich Oshawa Executive Airport CFB Trenton Western Islands Wiarton Airport Point Petre Lake Simcoe Regional Airport Parry Sound Harbour Toronto City Centre Airport Muskoka Airport Lagoon City Brockville Hamilton Munro Int'l Airport Sarnia Chris Hadfield Airport Tobermory Cobourg Harrow AAFC Long Point Port Weller Burlington Lift Bridge St. Catharines / Niagara District Airport Southeast Shoal Point Pelee Vineland Station Welland-Pelham Erieau Windsor Airport Port Colborne Killarney South Georgian Bay - 45143 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Lake St Clair - 45147 South Lake Huron - 45149 Sault Ste. Marie Airport Lake Simcoe - 45151 Collingwood Greater Sudbury Airport North Bay Airport Kingston Airport Peterborough Municipal Airport Grenadier Island Port Colborne - 45142 Great Duck Island Ajax - 45159 Gore Bay-Manitoulin Airport North Channel - 45154 Lake Nipissing - 45152
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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 16 May 2025 Forecasts have ended for the season.
Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EST 12 December 2025 Today Tonight and Saturday At 3:00 a.m. EST today departing low 980 mb located over
northeastern Quebec.

At 3:00 a.m. EST today ridge located on a line north-south over
northwestern Ontario.
By 3:00 a.m. EST Saturday ridge located on a line north-south over
southern Quebec.

At 3:00 a.m. EST today trough located on a line north-south over
the Ontario - Manitoba border.
By 3:00 a.m. EST Saturday trough located on a line north-south
over Lake Huron.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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