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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 12 October 2026

Today Tonight and Tuesday.

Wind variable 10 knots becoming southwest 10 this morning then increasing to southwest 15 near noon. Wind diminishing to variable 10 this evening then increasing to east 15 overnight. Wind diminishing to variable 10 Tuesday morning then increasing to southwest 15 Tuesday afternoon. Wind diminishing to northwest 10 Tuesday evening.

Scattered showers Tuesday with a risk of thunderstorms.

Waves

Issued 03:00 AM EDT 12 October 2026
Today Tonight and Tuesday. Waves 0.5 to 1 metre.

Extended Forecast

Issued 03:00 AM EDT 12 October 2026
Wednesday Wind west 20 knots.
Thursday Wind north 15 knots veering to east 15.
Friday Wind southeast 20 knots increasing to northwest 35 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

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 12 October 2026 Today Tonight and Tuesday At 3:00 a.m. EDT today departing low 1008 mb located over the East
Coast of the U.S.

At 3:00 a.m. EDT today trough located on a line northeast-southwest
over eastern Lake Superior.
By 3:00 a.m. EDT Tuesday trough located on a line east-west over
Lake Huron.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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