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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 12 May 2026

Tonight and Wednesday.

Strong wind warning in effect.

Wind variable 10 knots increasing to east 15 late overnight and to southeast 20 early Wednesday morning. Wind veering to south 20 late Wednesday morning then diminishing to southwest 15 near noon Wednesday.

Periods of rain overnight and Wednesday. Risk of thunderstorms Wednesday morning and afternoon.

Waves

Issued 06:30 PM EDT 12 May 2026
Tonight and Wednesday. Waves 0.5 metres or less building to 1 to 1.5 early Wednesday morning then subsiding to 1 Wednesday afternoon.

Extended Forecast

Issued 06:30 PM EDT 12 May 2026
Thursday Wind southwest 15 knots diminishing to light in the morning.
Friday Wind light becoming west 15 knots.
Saturday Wind southwest 15 knots.

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 Huron marine weather areas Wiarton Airport Western Islands Cove Island Goderich Lake Simcoe Regional Airport Vineland Station Parry Sound Harbour Sarnia Chris Hadfield Airport Tobermory Muskoka Airport Harrow AAFC Long Point Port Weller St. Catharines / Niagara District Airport Lagoon City Southeast Shoal Burlington Lift Bridge Welland-Pelham Windsor Airport Port Colborne Erieau Peterborough Municipal Airport CFB Trenton Toronto City Centre Airport Point Petre Oshawa Executive Airport Hamilton Munro Int'l Airport Point Pelee Cobourg Port Colborne - 45142 North Channel - 45154 Ajax - 45159 Lake Nipissing - 45152 Sault Ste. Marie Airport Killarney Lake Simcoe - 45151 Greater Sudbury Airport South Lake Huron - 45149 Lake St Clair - 45147 North Bay Airport South Georgian Bay - 45143 Gore Bay-Manitoulin Airport Grimsby - 45139 Georgian Bay - 45137 Great Duck Island Collingwood Kingston Airport Grenadier Island Brockville Prince Edward Point - 45135 Port Stanley - 45132
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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 6:30 PM EDT 12 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 6:30 PM EDT 12 May 2026 Tonight and Wednesday At 6:30 p.m. EDT tonight ridge located on a line north-south over
eastern Ontario.
By 6:30 p.m. EDT Wednesday weakening ridge located on a line
north-south over Quebec.

At 6:30 p.m. EDT tonight low 1002 mb located over Wisconsin.
By 6:30 p.m. EDT Wednesday low 1003 mb located over eastern Ontario.

At 6:30 p.m. EDT tonight ridge located on a line northwest-southeast
over Saskatchewan.
By 6:30 p.m. EDT Wednesday ridge located on a line north-south
over northwestern Ontario.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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