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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 10 October 2026

Today Tonight and Sunday.

Strong wind warning in effect.

Wind east 15 knots veering to southeast 15 this evening then increasing to southeast 20 late overnight. Wind diminishing to southeast 15 near noon Sunday and to east 10 Sunday evening.

Periods of rain Sunday late in the day.

Waves

Issued 10:30 AM EDT 10 October 2026
Today Tonight and Sunday. Waves 0.5 to 1 metre building to 1 to 1.5 early Sunday morning then subsiding to 0.5 to 1 Sunday afternoon. Waves subsiding to 0.5 or less Sunday evening.

Extended Forecast

Issued 03:00 AM EDT 10 October 2026
Monday Wind light becoming southwest 15 knots late in the day.
Tuesday Wind southwest 15 knots becoming northeast 15.
Wednesday Wind northeast 15 knots diminishing to light.

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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

Warnings (In effect)

Strong wind warning in effect

Eastern Lake Ontario

Issued 10:30 AM EDT 10 October 2026

'Strong' winds of 20 to 33 knots are occurring or expected to occur in this marine area. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 10 October 2026 Today Tonight and Sunday At 10:30 a.m. EDT today departing ridge from 1033 mb high located
on a line northwest-southeast over eastern Ontario.

At 10:30 a.m. EDT today low 996 mb located over North Dakota.
By 10:30 a.m. EDT Sunday low 1006 mb located over northwestern
Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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