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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 15 July 2026

Tonight and Thursday.

Wind northwest 10 knots backing to southwest 10 Thursday morning then veering to northwest 10 Thursday evening.

Scattered showers this evening. Smoke. Visibility as low as 1 mile in smoke.

Waves

Issued 06:30 PM EDT 15 July 2026
Tonight and Thursday. Waves 0.5 metres or less.

Extended Forecast

Issued 06:30 PM EDT 15 July 2026
Friday Wind light.
Saturday Wind light becoming south 15 knots.
Sunday Wind north 15 knots becoming southwest 15 late in the day.

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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 15 July 2026 Tonight and Thursday At 6:30 p.m. EDT tonight ridge located on a line northwest-southeast
over southern Manitoba.
By 6:30 p.m. EDT Thursday ridge located on a line
northwest-southeast over northern Ontario.

At 6:30 p.m. EDT tonight departing trough located on a line
east-west over New York State.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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