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Southern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EST 07 December 2025

Tonight and Monday.

Wind northwest 25 knots diminishing to north 15 near midnight and to variable 10 early Monday morning. Wind becoming southwest 10 near noon Monday then increasing to southwest 20 Monday evening.

Scattered flurries this evening Monday afternoon and evening.

Risk of freezing spray this evening.

Waves

Issued 06:30 PM EST 07 December 2025
Tonight and Monday. Waves 2 metres subsiding to 1 late overnight and to 0.5 or less Monday morning. Waves building to 0.5 to 1 Monday evening.

Extended Forecast

Issued 06:30 PM EST 07 December 2025
Tuesday Wind southwest 25 knots backing to south 30 in the morning then veering to west 25 in the afternoon.
Wednesday Wind light increasing to northeast 20 knots.
Thursday Wind northwest 15 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

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EST 7 December 2025 Tonight and Monday At 6:30 p.m. EST tonight departing low 1014 mb located over Vermont.

At 6:30 p.m. EST tonight ridge located on a line north-south
over Minnesota.
By 6:30 p.m. EST Monday ridge located on a line northeast-southwest
over New York State.

By 6:30 p.m. EST Monday deepening low 1008 mb located over North
Dakota.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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