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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 07:15 AM EST 08 November 2025

Today Tonight and Sunday.

Strong wind warning in effect.

Wind northwest 15 knots diminishing to northwest 10 this morning then becoming light this afternoon. Wind becoming northeast 10 this evening then increasing to northeast 15 near midnight. Wind increasing to northeast 20 early Sunday morning and to northeast 25 late Sunday morning. Wind backing to north 20 Sunday evening.

Periods of rain beginning overnight changing to periods of snow or rain Sunday morning.

Waves

Issued 03:00 AM EST 08 November 2025
Today Tonight and Sunday. Waves 1 to 1.5 metres subsiding to 0.5 to 1 this morning and to 0.5 or less near noon. Waves building to 0.5 to 1 overnight and to 1 to 1.5 Sunday morning.

Extended Forecast

Issued 03:00 AM EST 08 November 2025
Monday Wind north 20 knots.
Tuesday Wind northwest 20 knots backing to west 25.
Wednesday Wind southwest 25 knots veering to west 30.

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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 07:15 AM EST 08 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 3:00 AM EST 8 November 2025 Today Tonight and Sunday At 3:00 a.m. EST today departing low 991 mb located over southern
Quebec.

By 3:00 a.m. EST Sunday ridge located on a line east-west over
northeastern Ontario.

At 3:00 a.m. EST today low 1008 mb located over western North
Dakota.
By 3:00 a.m. EST Sunday low 1006 mb located over Indiana.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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