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Northern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 10 December 2025

Today Tonight and Thursday.

Wind west 15 knots increasing to northeast 20 early this morning then backing to north 25 this afternoon. Wind backing to northwest 25 this evening then diminishing to northwest 15 Thursday afternoon.

Scattered flurries changing to snow this morning then to scattered flurries this evening. Visibility 1 mile or less in snow.

Freezing spray warning in effect.

Freezing spray beginning this evening and ending near noon Thursday.

Waves

Issued 03:00 AM EST 10 December 2025
Today Tonight and Thursday. Waves 0.5 to 1 metre building to 1 to 1.5 this morning and to 2 early this evening. Waves subsiding to 1.5 near noon Thursday and to 1 Thursday evening.

Extended Forecast

Issued 03:00 AM EST 10 December 2025
Friday Wind northwest 15 knots increasing to southwest 25 late in the day.
Saturday Wind southwest 25 knots veering to northwest 20 late in the day.
Sunday Wind northwest 20 knots increasing to northwest 25.

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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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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)

Freezing spray warning in effect

Northern Georgian Bay

Issued 03:00 AM EST 10 December 2025

Moderate or severe freezing spray is 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 3:00 AM EST 10 December 2025 Today Tonight and Thursday At 3:00 a.m. EST today low 991 mb located over southeastern
Wisconsin.
By 3:00 a.m. EST Thursday departing low 989 mb located over
southeastern Quebec.

By 3:00 a.m. EST Thursday approaching ridge located on a line
north-south over the Ontario - Manitoba border.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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