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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EST 05 March 2026

Tonight and Friday.

Wind northeast 20 knots veering to east 20 late overnight then diminishing to east 15 near noon Friday. Wind diminishing to variable 10 Friday evening.

Periods of rain changing to periods of drizzle overnight and ending near noon Friday. Periods of rain Friday evening.

Waves

Issued 03:00 AM EST 06 March 2026
Today Tonight and Saturday. Waves 1.5 metres subsiding to 1 this afternoon and to 0.5 or less near midnight. Waves building to 1 Saturday morning and to 1.5 Saturday afternoon.

Extended Forecast

Issued 03:00 AM EST 06 March 2026
Sunday Wind west 25 knots.
Monday Wind southwest 20 knots.
Tuesday Wind west 15 knots diminishing to light.

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

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.
Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EST 6 March 2026 Today Tonight and Saturday At 3:00 a.m. EST today departing ridge located on a line
northwest-southeast over central Quebec.

At 3:00 a.m. EST today trough located from Kansas to Lake of
the Woods.
By 3:00 a.m. EST Saturday trough located on a line
northeast-southwest over Lake Superior.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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