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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 12 May 2026

Tonight and Wednesday.

Strong wind warning in effect.

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

Periods of rain tonight and Wednesday. Risk of thunderstorms overnight and Wednesday. Fog patches forming Wednesday morning and dissipating near noon Wednesday.

Waves

Issued 06:30 PM EDT 12 May 2026
Tonight and Wednesday. Waves 0.5 metres or less building to 1 late overnight.

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 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

Western 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 Erie and Lake Ontario Area

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Marine Weather for Canada

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