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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 21 April 2026

Today Tonight and Wednesday.

Wind south 15 knots backing to southeast 15 this afternoon then increasing to southeast 20 this evening. Wind diminishing to southeast 15 late overnight and to light Wednesday morning.

Waves

Issued 10:30 AM EDT 21 April 2026
Today Tonight and Wednesday. Waves 0.5 to 1 metre subsiding to 0.5 or less near noon Wednesday.

Extended Forecast

Issued 03:00 AM EDT 21 April 2026
Thursday Wind light.
Friday Wind east 15 knots.
Saturday Wind east 20 knots.

Ice Forecast*

Issued 12:00 PM EDT 21 April 2026 Today Tonight and Wednesday Ice free.

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

 

[ Canadian Ice Service ]

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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
Legend:
buoy Buoy
land station Land Station
Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 21 April 2026 Today Tonight and Wednesday

Ice Coverage

Ice free.

Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 21 April 2026 Today Tonight and Wednesday At 10:30 a.m. EDT today ridge located on a line northeast-southwest
over New Brunswick.
By 10:30 a.m. EDT Wednesday ridge located on a line north-south
over Nova Scotia.

At 10:30 a.m. EDT today trough located on a line north-south over
Lake Superior.
By 10:30 a.m. EDT Wednesday trough located on a line north-south
over Quebec.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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