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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 11 October 2026

Today Tonight and Monday.

Strong wind warning in effect.

Wind southeast 20 knots diminishing to southeast 15 near noon then backing to east 15 early this evening. Wind diminishing to northeast 10 near midnight then backing to northwest 10 late overnight. Wind backing to west 10 Monday morning then increasing to west 15 Monday afternoon. Wind diminishing to south 10 Monday evening.

Periods of rain this afternoon and this evening.

Waves

Issued 10:30 AM EDT 11 October 2026
Today Tonight and Monday. Waves 1 to 1.5 metres subsiding to 0.5 to 1 this afternoon and to 0.5 or less late overnight. Waves building to 0.5 to 1 Monday evening.

Extended Forecast

Issued 03:00 AM EDT 11 October 2026
Tuesday Wind southwest 15 knots increasing to northeast 20 late in the day.
Wednesday Wind northeast 20 knots diminishing to light.
Thursday Wind light increasing to southeast 20 knots late in the day.

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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 11 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 11 October 2026 Today Tonight and Monday At 10:30 a.m. EDT today Post-tropical Storm Isaias 1012 mb located
over Arkansas.
By 10:30 a.m. EDT Monday departing low 1005 mb located south of
Nova Scotia.

At 10:30 a.m. EDT today trough located on a line northeast-southwest
over northern Ontario.
By 10:30 a.m. EDT Monday trough located on a line east-west over
northeastern Ontario.

By 10:30 a.m. EDT Monday ridge located on a line northeast-southwest
over southern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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