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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 20 May 2026

Today Tonight and Thursday.

Strong wind warning in effect.

Wind southwest 20 knots diminishing to west 15 early this morning except light near the west end today. Wind becoming northwest 15 early this evening then veering to northeast 15 overnight. Wind diminishing to light Thursday morning.

Scattered showers ending early this morning.

Waves

Issued 03:00 AM EDT 20 May 2026
Today Tonight and Thursday. Waves 1 metre subsiding to 0.5 this morning then building to 0.5 to 1 this evening. Waves subsiding to less than 0.5 near noon Thursday.

Extended Forecast

Issued 03:00 AM EDT 20 May 2026
Friday Wind light becoming east 15 knots in the morning.
Saturday Wind east 20 knots.
Sunday Wind southeast 20 knots diminishing to light late in the day.

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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 17 May 2026 Forecasts have ended for the season.
Warnings

Warnings (In effect)

Strong wind warning in effect

Western Lake Ontario

Issued 03:00 AM EDT 20 May 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 or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 20 May 2026 Today Tonight and Thursday At 3:00 a.m. EDT today departing low 998 mb located over central
Quebec.

At 3:00 a.m. EDT today ridge located on a line north-south over
the Ontario - Manitoba border.
By 3:00 a.m. EDT Thursday high 1030 mb located over Lake Superior.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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