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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 11 November 2025

Today Tonight and Wednesday.

Strong wind warning in effect.

Wind northwest 20 knots increasing to southwest 30 this afternoon then veering to west 25 this evening. Wind backing to southwest 20 late overnight then increasing to west 30 Wednesday afternoon.

Scattered flurries ending this afternoon. Scattered showers overnight and Wednesday.

Waves

Issued 10:30 AM EST 11 November 2025
Today Tonight and Wednesday. Waves 1 metre building to 2 early this evening then subsiding to 1.5 near midnight. Waves subsiding to 1 early Wednesday morning then building to 2 Wednesday evening.

Extended Forecast

Issued 03:00 AM EST 11 November 2025
Thursday Wind west 20 knots.
Friday Wind west 15 knots.
Saturday Wind light.

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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)

Strong wind warning in effect

Western Lake Ontario

Issued 10:30 AM EST 11 November 2025

'Strong' winds of 20 to 33 knots are 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 November 2025 Today Tonight and Wednesday At 10:30 a.m. EST today ridge located on a line north-south over
Lake Huron.
By 10:30 a.m. EST Wednesday dissipating ridge located on a line
north-south over Quebec.

At 10:30 a.m. EST today trough located on a line north-south over
the Ontario - Manitoba border.
By 10:30 a.m. EST Wednesday low 999 mb located over northeastern
Ontario.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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