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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 05 October 2026

Today Tonight and Tuesday.

Strong wind warning in effect.

Wind northwest 20 knots increasing to northwest 25 this morning then diminishing to northwest 15 this evening. Wind diminishing to northwest 10 overnight then becoming light Tuesday morning. Wind becoming southwest 10 Tuesday afternoon then increasing to southwest 15 Tuesday evening.

Scattered showers today with a risk of waterspouts.

Waves

Issued 03:00 AM EDT 05 October 2026
Today Tonight and Tuesday. Waves 1 metre building to 1.5 early this morning then subsiding to 1 early this evening. Waves subsiding to 0.5 or less Tuesday morning.

Extended Forecast

Issued 03:00 AM EDT 05 October 2026
Wednesday Wind southwest 15 knots increasing to southwest 25 in the morning then diminishing to west 15 late in the day.
Thursday Wind west 15 knots increasing to west 25 late in the day.
Friday Wind west 20 knots diminishing to light late in the day.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Hamilton Munro Int'l Airport CFB Trenton Erieau Toronto City Centre Airport Point Pelee Peterborough Municipal Airport Burlington Lift Bridge Point Petre Cobourg Oshawa Executive Airport South Lake Huron - 45149 Port Colborne Brockville Gore Bay-Manitoulin Airport North Bay Airport Greater Sudbury Airport Killarney Sault Ste. Marie Airport Ajax - 45159 North Channel - 45154 Lake Nipissing - 45152 Lake Simcoe - 45151 Windsor Airport Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Welland-Pelham Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Western Islands Sarnia Chris Hadfield Airport Vineland Station Southeast Shoal St. Catharines / Niagara District Airport Goderich Port Weller Long Point Tobermory
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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 03:00 AM EDT 05 October 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.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 5 October 2026 Today Tonight and Tuesday At 3:00 a.m. EDT today low 995 mb located over southern James Bay.
By 3:00 a.m. EDT Tuesday departing low 990 mb located over eastern
Quebec.

At 3:00 a.m. EDT today ridge located on a line north-south over
eastern Manitoba.
By 3:00 a.m. EDT Tuesday ridge located over Lake Huron.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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