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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 12 November 2025

Today Tonight and Thursday.

Strong wind warning in effect.

Wind southwest 25 knots veering to west 30 near noon then diminishing to west 20 late overnight. Wind diminishing to northwest 15 Thursday afternoon.

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

Waves

Issued 10:30 AM EST 12 November 2025
Today Tonight and Thursday. Waves 1.5 to 2 metres.

Extended Forecast

Issued 03:00 AM EST 12 November 2025
Friday Wind west 15 knots diminishing to light late in the day.
Saturday Wind light becoming southeast 15 knots.
Sunday Wind west 15 knots increasing to northwest 25.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Burlington Lift Bridge Oshawa Executive Airport Point Pelee Peterborough Municipal Airport Point Petre Hamilton Munro Int'l Airport Erieau Cobourg Toronto City Centre Airport Port Colborne CFB Trenton South Lake Huron - 45149 Windsor Airport Great Duck Island Gore Bay-Manitoulin Airport North Bay Airport Greater Sudbury Airport Killarney Sault Ste. Marie Airport Ajax - 45159 North Channel - 45154 Lake Nipissing - 45152 Lake Simcoe - 45151 Welland-Pelham Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Vineland Station Brockville Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Cove Island Goderich Sarnia Chris Hadfield Airport Western Islands Tobermory Long Point Port Weller St. Catharines / Niagara District Airport Southeast Shoal
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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 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 10:30 AM EST 12 November 2025 Today Tonight and Thursday At 10:30 a.m. EST today dissipating ridge located over Quebec.

At 10:30 a.m. EST today low 995 mb located over northeastern
Ontario.
By 10:30 a.m. EST Thursday departing trough located on a line
north-south over central Quebec.

By 10:30 a.m. EST Thursday approaching ridge located on a line
northwest-southeast over Illinois.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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