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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 06 December 2025

Today Tonight and Sunday.

Wind southwest 25 knots veering to west 25 near noon then diminishing to northwest 15 this evening. Wind diminishing to north 10 late overnight then increasing to northeast 15 Sunday morning. Wind backing to north 15 Sunday afternoon then to northwest 20 Sunday evening.

Scattered flurries ending this afternoon. Flurries Sunday. Visibility 1 mile or less in flurries.

Waves

Issued 10:30 AM EST 06 December 2025
Today Tonight and Sunday. Waves 1.5 metres subsiding to 0.5 to 1 near midnight and to 0.5 or less early Sunday morning. Waves building to 0.5 to 1 near noon Sunday.

Extended Forecast

Issued 03:00 AM EST 06 December 2025
Monday Wind northwest 20 knots diminishing to light in the afternoon.
Tuesday Wind south 15 knots increasing to southwest 25.
Wednesday Wind southwest 25 knots diminishing to north 20 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

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EST 6 December 2025 Today Tonight and Sunday At 10:30 a.m. EST today departing cold front located on a line
northeast-southwest over Lake Nipissing.

At 10:30 a.m. EST today disturbance located over Kansas.
By 10:30 a.m. EST Sunday low 1015 mb located south of Georgian Bay.

At 10:30 a.m. EST today ridge located on a line northwest-southeast
over Saskatchewan.
By 10:30 a.m. EST Sunday ridge located on a line northwest-southeast
over southern Manitoba.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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