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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 05 September 2026

Tonight and Sunday.

Wind west 10 knots veering to north 10 this evening then increasing to northeast 15 late overnight. Wind diminishing to northeast 10 Sunday afternoon then becoming light Sunday evening.

Waves

Issued 06:30 PM EDT 05 September 2026
Tonight and Sunday. Waves 0.5 metres or less building to 0.5 to 1 early Sunday morning then subsiding to 0.5 or less Sunday evening.

Extended Forecast

Issued 06:30 PM EDT 05 September 2026
Monday Wind light.
Tuesday Wind light.
Wednesday Wind south 15 knots veering to southwest 20.

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

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EDT 5 September 2026 Tonight and Sunday At 6:30 p.m. EDT tonight ridge located on a line northeast-southwest
over Lake Superior.
By 6:30 p.m. EDT Sunday ridge located over Ontario.

By 6:30 p.m. EDT Sunday approaching trough located on a line
northeast-southwest over North Dakota.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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