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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EST 08 December 2025

Tonight and Tuesday.

Wind variable 10 knots becoming southwest 10 this evening then increasing to southwest 15 near midnight. Wind backing to south 20 Tuesday morning then veering to southwest 25 Tuesday evening.

Snow Tuesday late in the day. Visibility 1 mile or less in snow.

Waves

Issued 06:30 PM EST 08 December 2025
Tonight and Tuesday. Waves 0.5 metres or less building to 0.5 to 1 late overnight and to 1 to 1.5 near noon Tuesday. Waves building to 2 to 3 Tuesday evening.

Extended Forecast

Issued 06:30 PM EST 08 December 2025
Wednesday Wind southwest 20 knots increasing to southwest 25 in the morning then veering to northwest 25 late in the day.
Thursday Wind northwest 25 knots.
Friday Wind west 15 knots backing to southwest 20 late in the day.

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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 6:30 PM EST 8 December 2025 Tonight and Tuesday At 6:30 p.m. EST tonight ridge located on a line northeast-southwest
over southern Ontario.
By 6:30 p.m. EST Tuesday ridge located east of the Eastern Seaboard.

At 6:30 p.m. EST tonight low 1010 mb located over North Dakota.
By 6:30 p.m. EST Tuesday low 1001 mb located over northeastern
Ontario.

By 6:30 p.m. EST Tuesday approaching low 990 mb located over
Minnesota.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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