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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 15 November 2025

Today Tonight and Sunday.

Gale warning in effect.

Wind east 10 knots increasing to southeast 15 early this morning and to southwest 20 early this evening. Wind veering to west 25 late this evening then increasing to west 35 near midnight. Wind diminishing to northwest 30 Sunday morning.

Scattered showers beginning near noon with a risk of thunderstorms this afternoon changing to flurries Sunday evening.

Waves

Issued 03:00 AM EST 15 November 2025
Today Tonight and Sunday. Waves 0.5 metres or less building to 0.5 to 1 this morning and to 2 near midnight. Waves building to 3 overnight then subsiding to 2 Sunday morning.

Extended Forecast

Issued 03:00 AM EST 15 November 2025
Monday Wind northwest 25 knots.
Tuesday Wind northwest 15 knots diminishing to light.
Wednesday 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)

Gale warning in effect

Western Lake Ontario

Issued 03:00 AM EST 15 November 2025

'Gale' force winds of 34 to 47 knots are occurring or expected to occur in this marine area. Watch for updated statements. 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 15 November 2025 Today Tonight and Sunday At 3:00 a.m. EST today dissipating ridge located on a line
north-south over Ottawa.

At 3:00 a.m. EST today trough from low located on a line north-south
over Lake Nipigon.
By 3:00 a.m. EST Sunday low 983 mb located over the St. Lawrence
River.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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