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Southern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 12 November 2025

Today Tonight and Thursday.

Strong wind warning in effect.

Wind northwest 25 knots diminishing to northwest 10 Thursday evening.

Scattered showers.

Waves

Issued 10:30 AM EST 12 November 2025
Today Tonight and Thursday. Waves 1 to 1.5 metres building to 2 early this afternoon then subsiding to 1.5 near midnight. Waves building to 2 early Thursday morning then subsiding to 1.5 near noon Thursday.

Extended Forecast

Issued 03:00 AM EST 12 November 2025
Friday Wind northwest 20 knots diminishing to light in the afternoon.
Saturday Wind southeast 15 knots increasing to southeast 20.
Sunday Wind northwest 25 knots.

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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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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

Warnings (In effect)

Strong wind warning in effect

Southern Georgian Bay

Issued 10:30 AM EST 12 November 2025

'Strong' winds of 20 to 33 knots are occurring or expected to occur in this marine area. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EST 12 November 2025 Today Tonight and Thursday At 10:30 a.m. EST today dissipating ridge located over Quebec.

At 10:30 a.m. EST today low 995 mb located over northeastern
Ontario.
By 10:30 a.m. EST Thursday departing trough located on a line
north-south over central Quebec.

By 10:30 a.m. EST Thursday approaching ridge located on a line
northwest-southeast over Illinois.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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