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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 13 May 2026

Today Tonight and Thursday.

Strong wind warning in effect.

Wind south 20 knots diminishing to southwest 15 near noon and to southwest 10 late overnight. Wind becoming light Thursday morning then becoming west 10 Thursday evening.

Scattered showers. Risk of thunderstorms this afternoon.

Waves

Issued 10:30 AM EDT 13 May 2026
Today Tonight and Thursday. Waves 1 to 1.5 metres subsiding to 0.5 or less early Thursday morning.

Extended Forecast

Issued 03:00 AM EDT 13 May 2026
Friday Wind light becoming west 15 knots in the afternoon.
Saturday Wind southwest 15 knots.
Sunday Wind light.

Ice Forecast*

Issued 12:00 PM EDT 12 May 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
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land station Land Station
Ice Conditions

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

Ice Forecasts

Issued 12:00 PM EDT 12 May 2026 Today Tonight and Wednesday

Ice Coverage

Ice free.

Warnings

Warnings (In effect)

Strong wind warning in effect

Eastern Lake Ontario

Issued 10:30 AM EDT 13 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 10:30 AM EDT 13 May 2026 Today Tonight and Thursday At 10:30 a.m. EDT today weakening ridge located on a line
northwest-southeast over central Quebec.

At 10:30 a.m. EDT today low 1002 mb located over Georgian Bay.
By 10:30 a.m. EDT Thursday low 1007 mb located over eastern Ontario.

At 10:30 a.m. EDT today ridge located on a line north-south over
the Ontario - Manitoba border.
By 10:30 a.m. EDT Thursday ridge located on a line north-south
over Lake Superior.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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