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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 10 March 2026

Today Tonight and Wednesday.

Wind southwest 10 knots becoming variable 10 this morning then becoming northeast 10 this afternoon. Wind increasing to northeast 15 this evening then veering to east 20 overnight. Wind backing to northeast 15 near noon Wednesday then increasing to southwest 25 Wednesday evening.

Scattered showers beginning this morning with a risk of thunderstorms.

Waves

Issued 03:00 AM EDT 10 March 2026
Today Tonight and Wednesday. Waves 0.5 metres or less building to 0.5 to 1 near midnight and to 1 to 1.5 Wednesday morning. Waves subsiding to 0.5 to 1 Wednesday afternoon then building to 1 to 1.5 Wednesday evening.

Extended Forecast

Issued 03:00 AM EDT 10 March 2026
Thursday Wind west 30 knots diminishing to northwest 15 late in the day.
Friday Wind southeast 20 knots veering to south 25.
Saturday Wind west 35 knots diminishing to light late in the day.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas CFB Trenton Port Colborne - 45142 Hamilton Munro Int'l Airport Oshawa Executive Airport Port Stanley - 45132 Lake Nipissing - 45152 Point Petre Georgian Bay - 45137 Toronto City Centre Airport Lake Simcoe - 45151 South Georgian Bay - 45143 Prince Edward Point - 45135 Peterborough Municipal Airport South Lake Huron - 45149 Collingwood Lake St Clair - 45147 Grimsby - 45139 Goderich Lagoon City Kingston Airport Muskoka Airport Parry Sound Harbour Grenadier Island Lake Simcoe Regional Airport Wiarton Airport Brockville Western Islands Cove Island Great Duck Island North Channel - 45154 Sarnia Chris Hadfield Airport Gore Bay-Manitoulin Airport Tobermory Harrow AAFC Long Point North Bay Airport Port Weller St. Catharines / Niagara District Airport Greater Sudbury Airport Southeast Shoal Vineland Station Port Colborne Erieau Cobourg Sault Ste. Marie Airport Windsor Airport Welland-Pelham Killarney Ajax - 45159 Point Pelee Burlington Lift Bridge
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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 3:00 AM EDT 10 March 2026 Today Tonight and Wednesday By 3:00 a.m. EDT Wednesday approaching low 1002 mb located over
Iowa.

At 3:00 a.m. EDT today high 1021 mb located over southeastern
Manitoba.
By 3:00 a.m. EDT Wednesday high 1033 mb located east of James Bay.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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