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

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 Erie and Lake Ontario Area

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Marine Weather for Canada

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