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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 07 March 2026

Today Tonight and Sunday.

Wind south 25 knots veering to southwest 25 this afternoon then to west 25 this evening. Wind diminishing to west 15 near noon Sunday then backing to southwest 20 Sunday evening.

Showers and fog patches ending overnight with a risk of thunderstorms.

Waves

Issued 03:00 AM EST 07 March 2026
Today Tonight and Sunday. Over open water waves 1 metre building to 1 to 1.5 early this morning then subsiding to 1 near noon. Waves building to 1.5 early this evening then subsiding to 1 Sunday morning.

Extended Forecast

Issued 03:00 AM EST 07 March 2026
Monday Wind southwest 20 knots.
Tuesday Wind southwest 15 knots diminishing to light.
Wednesday Wind south 15 knots increasing to north 20 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 EST 7 March 2026 Today Tonight and Sunday At 3:00 a.m. EST today trough located from Whitefish Bay to Iowa.
By 3:00 a.m. EDT Sunday trough located on a line northeast-southwest
over the St. Lawrence River.

At 3:00 a.m. EST today ridge located on a line northeast-southwest
over northwestern Ontario.
By 3:30 a.m. EDT Sunday ridge located on a line northeast-southwest
over northeastern Ontario.

By 3:00 a.m. EDT Sunday trough located on a line north-south over
western Lake Superior.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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