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Northern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 15 December 2025

Today Tonight and Tuesday.

Gale warning in effect.

Wind northwest 15 knots backing to southwest 20 early this morning then veering to west 20 early this evening. Wind diminishing to west 15 near midnight then backing to southwest 20 Tuesday morning. Wind increasing to southwest 35 Tuesday evening.

Flurries changing to snow early this morning then to scattered flurries this evening and ending Tuesday afternoon. Risk of freezing drizzle Tuesday morning and afternoon.

Waves

Issued 03:00 AM EST 15 December 2025
Today Tonight and Tuesday. Waves 0.5 to 1 metre building to 2 this afternoon then subsiding to 0.5 to 1 this evening. Waves building to 1.5 Tuesday morning and to 2 to 3 Tuesday afternoon.

Extended Forecast

Issued 03:00 AM EST 15 December 2025
Wednesday Wind southwest 35 knots diminishing to southwest 30 in the morning then veering to northwest 25 in the afternoon.
Thursday Wind south 25 knots veering to southwest 30 late in the day.
Friday Wind southwest 30 knots diminishing to light late in the day.

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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)

Gale warning in effect

Northern Georgian Bay

Issued 03:00 AM EST 15 December 2025

'Gale' force winds of 34 to 47 knots are occurring or expected to occur in this marine area. Watch for updated statements. 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 3:00 AM EST 15 December 2025 Today Tonight and Tuesday At 3:00 a.m. EST today high 1037 mb located over southern Illinois.
By 3:00 a.m. EST Tuesday high 1030 mb located over North Carolina.

At 3:00 a.m. EST today trough located on a line northeast-southwest
over the Ontario - Manitoba border.
By 3:00 a.m. EST Tuesday trough located on a line
northeast-southwest over Georgian Bay.

By 3:00 a.m. EST Tuesday approaching low 988 mb located over
southern Saskatchewan.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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