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Southern Georgian Bay

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Marine Forecast

Issued 10:30 AM EST 11 December 2025

Today Tonight and Friday.

Wind northwest 25 knots diminishing to west 10 Friday afternoon then increasing to southwest 20 Friday evening.

Flurries. Visibility 1 mile or less in flurries.

Freezing spray warning in effect.

Freezing spray ending near noon.

Waves

Issued 10:30 AM EST 11 December 2025
Today Tonight and Friday. Waves 2 metres subsiding to 1.5 near noon and to 1 near midnight.

Extended Forecast

Issued 03:00 AM EST 11 December 2025
Saturday Wind southwest 25 knots veering to northwest 20 late in the day.
Sunday Wind north 20 knots.
Monday Wind light increasing to southwest 20 knots.

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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)

Freezing spray warning in effect

Southern Georgian Bay

Issued 10:30 AM EST 11 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 10:30 AM EST 11 December 2025 Today Tonight and Friday At 10:30 a.m. EST today departing low 986 mb located over
southeastern Quebec.

At 10:30 a.m. EST today ridge located on a line north-south over
the Ontario - Manitoba border.
By 10:30 a.m. EST Friday ridge located on a line north-south
over Minnesota.

By 10:30 a.m. EST Friday approaching trough 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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