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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 11 October 2026

Tonight and Monday.

Wind southeast 15 knots diminishing to variable 10 near midnight then becoming west 10 early Monday morning. Wind increasing to west 15 near noon Monday then diminishing to variable 10 Monday evening.

Periods of rain this evening.

Waves

Issued 06:30 PM EDT 11 October 2026
Tonight and Monday. Waves 0.5 to 1 metre subsiding to 0.5 or less late overnight then building to 0.5 to 1 Monday afternoon. Waves subsiding to 0.5 or less Monday evening.

Extended Forecast

Issued 06:30 PM EDT 11 October 2026
Tuesday Wind southwest 15 knots veering to west 20 late in the day.
Wednesday Wind west 20 knots veering to north 15.
Thursday Wind north 15 knots veering to east 15.

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

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 17 May 2026 Forecasts have ended for the season.
Warnings

Warnings (Ended)

Strong wind warning ended

Eastern Lake Ontario

Issued 6:30 PM EDT 11 October 2026
Synopsis

Technical Marine Synopsis

Issued 6:30 PM EDT 11 October 2026 Tonight and Monday At 6:30 p.m. EDT tonight Post-tropical Storm Isaias 1009 mb located
over Virginia.
By 6:30 p.m. EDT Monday departing low 995 mb located east of
Nova Scotia.

At 6:30 p.m. EDT tonight trough located on a line
northeast-southwest over northeastern Ontario.
By 6:30 p.m. EDT Monday trough located on a line east-west over
northern Ontario.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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