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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EST 12 November 2025

Tonight and Thursday.

Strong wind warning in effect.

Wind west 30 knots diminishing to west 20 early Thursday morning and to northwest 15 Thursday afternoon.

Scattered showers ending overnight. Scattered showers Thursday late in the day.

Waves

Issued 06:30 PM EST 12 November 2025
Tonight and Thursday. Waves 2 metres subsiding to 1.5 near midnight and to 1 Thursday morning.

Extended Forecast

Issued 06:30 PM EST 12 November 2025
Friday Wind west 15 knots diminishing to light late in the day.
Saturday Wind light increasing to west 20 knots late in the day.
Sunday Wind northwest 30 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)

Strong wind warning in effect

Western Lake Ontario

Issued 9:22 PM EST 12 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 6:30 PM EST 12 November 2025 Tonight and Thursday At 6:30 p.m. EST tonight low 999 mb located over southern Quebec.
By 6:30 p.m. EST Thursday departing trough located on a line
north-south over central Quebec.

By 6:30 p.m. EST Thursday approaching ridge located on a line
northwest-southeast over northwestern Ontario.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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