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Southern Georgian Bay

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 10 March 2026

Today Tonight and Wednesday.

Wind northeast 15 knots increasing to northeast 20 early this evening then diminishing to northeast 15 near noon Wednesday. Wind backing to northwest 20 Wednesday evening.

Scattered showers beginning this afternoon changing to periods of freezing rain near midnight then to periods of rain or periods of freezing rain near noon Wednesday.

Waves

Issued 10:30 AM EDT 10 March 2026
Today Tonight and Wednesday. Over open water waves 0.5 metres or less building to 0.5 to 1 this evening.

Extended Forecast

Issued 03:00 AM EDT 10 March 2026
Thursday Wind northwest 25 knots diminishing to northwest 15 in the afternoon.
Friday Wind southeast 30 knots increasing to southwest 35 late in the day.
Saturday Wind southwest 35 knots diminishing to light late in the day.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas CFB Trenton Port Colborne - 45142 Hamilton Munro Int'l Airport Oshawa Executive Airport Port Stanley - 45132 Lake Nipissing - 45152 Point Petre Georgian Bay - 45137 Toronto City Centre Airport Lake Simcoe - 45151 South Georgian Bay - 45143 Prince Edward Point - 45135 Peterborough Municipal Airport South Lake Huron - 45149 Collingwood Lake St Clair - 45147 Grimsby - 45139 Goderich Lagoon City Kingston Airport Muskoka Airport Parry Sound Harbour Grenadier Island Lake Simcoe Regional Airport Wiarton Airport Brockville Western Islands Cove Island Great Duck Island North Channel - 45154 Sarnia Chris Hadfield Airport Gore Bay-Manitoulin Airport Tobermory Harrow AAFC Long Point North Bay Airport Port Weller St. Catharines / Niagara District Airport Greater Sudbury Airport Southeast Shoal Vineland Station Port Colborne Erieau Cobourg Sault Ste. Marie Airport Windsor Airport Welland-Pelham Killarney Ajax - 45159 Point Pelee Burlington Lift Bridge
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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 10:30 AM EDT 10 March 2026 Today Tonight and Wednesday By 10:30 a.m. EDT Wednesday approaching low 998 mb located over
Indiana.

At 10:30 a.m. EDT today high 1030 mb located over northern Ontario.
By 10:30 a.m. EDT Wednesday high 1034 mb located east of James Bay.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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