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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 19 June 2025

Tonight and Friday.

Strong wind warning in effect.

Wind southwest 25 knots veering to west 20 this evening then diminishing to west 15 late overnight. Wind backing to southwest 15 near noon Friday then diminishing to southwest 10 Friday evening.

Scattered showers ending overnight. Risk of thunderstorms early this evening.

Waves

Issued 06:30 PM EDT 19 June 2025
Tonight and Friday. Waves 1 to 1.5 metres subsiding to 0.5 to 1 early Friday morning and to 0.5 or less Friday evening.

Extended Forecast

Issued 06:30 PM EDT 19 June 2025
Saturday Wind light becoming southwest 15 knots late in the day.
Sunday Wind southwest 20 knots.
Monday 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 6:30 PM EDT 19 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 6:30 PM EDT 19 June 2025 Tonight and Friday At 6:30 p.m. EDT tonight low 998 mb located west of Ottawa.
By 6:30 p.m. EDT Friday low 993 mb located over the Gulf of
St. Lawrence.

At 6:30 p.m. EDT tonight ridge located on a line northeast-southwest
over James Bay.
By 6:30 p.m. EDT Friday weakening ridge located on a line
north-south over James Bay.

By 6:30 p.m. EDT Friday approaching trough located on a line
northeast-southwest over Manitoba.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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