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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 20 June 2025

Today Tonight and Saturday.

Strong wind warning in effect.

Wind west 20 knots diminishing to west 15 this morning and to southwest 10 early this evening. Wind becoming light late this evening then becoming south 15 Saturday evening.

Scattered showers ending early this morning. Scattered showers overnight and Saturday with a risk of thunderstorms.

Waves

Issued 03:00 AM EDT 20 June 2025
Today Tonight and Saturday. Waves 2 metres subsiding to 1 to 1.5 early this morning and to 0.5 to 1 near noon. Waves subsiding to 0.5 or less this evening then building to 0.5 to 1 Saturday evening.

Extended Forecast

Issued 03:00 AM EDT 20 June 2025
Sunday Wind southwest 15 knots.
Monday Wind southwest 15 knots.
Tuesday Wind southwest 15 knots.

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

Warnings (In effect)

Strong wind warning in effect

Eastern Lake Ontario

Issued 03:00 AM EDT 20 June 2025

'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 June 2025 Today Tonight and Saturday At 3:00 a.m. EDT today departing low 997 mb located near Montréal.

At 3:00 a.m. EDT today ridge located on a line northeast-southwest
over northeastern Ontario.
By 3:00 a.m. EDT Saturday weakening ridge located on a line
north-south over western Quebec.

By 3:00 a.m. EDT Saturday approaching low 995 mb located over
western Minnesota.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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