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Northern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EST 15 December 2025

Tonight and Tuesday.

Gale warning in effect.

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

Scattered flurries ending Tuesday afternoon. Risk of freezing drizzle Tuesday morning and afternoon.

Waves

Issued 06:30 PM EST 15 December 2025
Tonight and Tuesday. Waves 2 metres subsiding to 0.5 to 1 this evening then building to 1.5 Tuesday morning. Waves building to 2 to 3 Tuesday afternoon.

Extended Forecast

Issued 06:30 PM EST 15 December 2025
Wednesday Wind southwest 30 knots veering to northwest 25 in the afternoon then becoming south 25 late in the day.
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 6:30 PM 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 6:30 PM EST 15 December 2025 Tonight and Tuesday At 6:30 p.m. EST tonight departing ridge located on a line
northeast-southwest over eastern Quebec.

At 6:30 p.m. EST tonight departing trough located on a line
northeast-southwest over the Ontario - Quebec border.

At 6:30 p.m. EST tonight low 987 mb located over Alberta.
By 6:30 p.m. EST Tuesday low 981 mb located over James Bay.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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