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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EST 07 March 2026

Tonight and Sunday.

Wind southwest 20 knots veering to west 20 near midnight then backing to southwest 15 Sunday morning. Wind increasing to southwest 20 Sunday afternoon.

Scattered showers ending overnight. Risk of thunderstorms early this evening. Fog patches dissipating near midnight.

Waves

Issued 06:30 PM EST 07 March 2026
Tonight and Sunday. Waves 1 to 1.5 metres subsiding to 0.5 to 1 Sunday morning.

Extended Forecast

Issued 06:30 PM EST 07 March 2026
Monday Wind southwest 15 to 20 knots veering to west 10 to 15 late in the day.
Tuesday Wind southwest 10 to 15 knots becoming light.
Wednesday Wind east 20 knots increasing to southwest 25 late in the day.

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

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EST 7 March 2026 Tonight and Sunday At 6:30 p.m. EST tonight trough located on a line
northeast-southwest over Georgian Bay.
By 6:30 p.m. EDT Sunday trough located on a line northeast-southwest
over Nova Scotia.

At 6:30 p.m. EST tonight ridge located from James Bay to Lake
Superior.
By 6:30 p.m. EDT Sunday ridge located from Quebec to Pennsylvania.

At 6:30 p.m. EST tonight low 988 mb located over northern Manitoba.
By 6:30 p.m. EDT Sunday low 984 mb located over James Bay.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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