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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 05 September 2026

Today Tonight and Sunday.

Wind north 10 knots becoming light near noon then becoming northeast 15 this evening. Wind diminishing to northeast 10 Sunday afternoon then becoming light Sunday evening.

Waves

Issued 10:30 AM EDT 05 September 2026
Today Tonight and Sunday. Waves 0.5 metres or less building to 0.5 to 1 near midnight then subsiding to 0.5 or less Sunday evening.

Extended Forecast

Issued 03:00 AM 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 10:30 AM EDT 5 September 2026 Today Tonight and Sunday At 10:30 a.m. EDT today departing trough located on a line east-west
over Virginia.

At 10:30 a.m. EDT today ridge located on a line northeast-southwest
over Lake Nipigon.
By 10:30 a.m. EDT Sunday ridge located on a line northeast-southwest
over Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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