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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 12 July 2026

Tonight and Monday.

Wind light becoming southwest 10 knots near noon Monday then increasing to southwest 15 Monday evening.

Waves

Issued 06:30 PM EDT 12 July 2026
Tonight and Monday. Waves 0.5 metres or less building to 0.5 to 1 Monday evening.

Extended Forecast

Issued 06:30 PM EDT 12 July 2026
Tuesday Wind southwest 15 knots increasing to southwest 20 in the morning.
Wednesday Wind west 20 knots diminishing to light.
Thursday Wind light becoming west 15 knots.

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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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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

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 6:30 PM EDT 12 July 2026 Tonight and Monday At 6:30 p.m. EDT tonight ridge located on a line east-west over
southern Ontario.
By 6:30 p.m. EDT Monday ridge located on a line east-west over
Pennsylvania.

At 6:30 p.m. EDT tonight low 1004 mb located over northeastern
Manitoba.
By 6:30 p.m. EDT Monday low 994 mb located over eastern Hudson Bay.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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