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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 05 June 2026

Tonight and Saturday.

Strong wind warning in effect.

Wind southwest 15 knots diminishing to southwest 10 near midnight then increasing to southwest 15 early Saturday morning. Wind increasing to southwest 20 late Saturday morning then diminishing to southwest 15 Saturday afternoon. Wind diminishing to west 10 Saturday evening.

Periods of rain overnight and Saturday with a risk of thunderstorms. Fog patches forming late overnight.

Waves

Issued 06:30 PM EDT 05 June 2026
Tonight and Saturday. Waves 0.5 to 1 metre subsiding to 0.5 or less late overnight then building to 0.5 to 1 Saturday morning.

Extended Forecast

Issued 06:30 PM EDT 05 June 2026
Sunday Wind west 15 knots diminishing to light late in the day.
Monday Wind light becoming east 15 knots.
Tuesday Wind southeast 15 knots diminishing to light.

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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 17 May 2026 Forecasts have ended for the season.
Warnings

Warnings (In effect)

Strong wind warning in effect

Western Lake Ontario

Issued 6:30 PM EDT 05 June 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 5 June 2026 Tonight and Saturday At 6:30 p.m. EDT tonight departing ridge located on a line
northwest-southeast over eastern Quebec.

At 6:30 p.m. EDT tonight low 1005 mb located over northwestern
Ontario.
By 6:30 p.m. EDT Saturday low 1000 mb located over central Quebec.

At 6:30 p.m. EDT tonight ridge located on a line north-south
over Manitoba.
By 6:30 p.m. EDT Saturday ridge located on a line north-south over
northern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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