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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 12 July 2025

Today Tonight and Sunday.

Wind southeast 10 knots backing to east 10 this afternoon then veering to southeast 10 this evening. Wind increasing to south 15 near midnight then veering to west 15 Sunday morning. Wind diminishing to southwest 10 Sunday afternoon.

Scattered showers overnight and Sunday with a risk of thunderstorms.

Waves

Issued 10:30 AM EDT 12 July 2025
Today Tonight and Sunday. Waves 0.5 metres or less building to 0.5 to 1 late overnight then subsiding to 0.5 or less Sunday evening.

Extended Forecast

Issued 03:00 AM EDT 12 July 2025
Monday Wind light becoming southwest 15 knots late in the day.
Tuesday Wind southwest 15 knots diminishing to light.
Wednesday Wind light.

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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

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 12 July 2025 Today Tonight and Sunday At 10:30 a.m. EDT today trough located on a line north-south over
Lake Superior.
By 10:30 a.m. EDT Sunday trough located on a line north-south over
eastern Ontario.

At 10:30 a.m. EDT today ridge located on a line north-south over
South Dakota.
By 10:30 a.m. EDT Sunday ridge located on a line north-south
over Illinois.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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