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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 17 July 2026

Tonight and Saturday.

Strong wind warning in effect.

Wind southeast 10 knots increasing to south 15 near midnight and to southwest 20 early Saturday morning. Wind veering to west 25 near noon Saturday then to northwest 20 Saturday evening.

Scattered showers Saturday with a risk of thunderstorms. Smoke forming near midnight and dissipating Saturday afternoon. Visibility as low as 1 mile in smoke.

Waves

Issued 06:30 PM EDT 17 July 2026
Tonight and Saturday. Waves 0.5 metres or less building to 0.5 to 1 Saturday morning and to 1.5 Saturday afternoon.

Extended Forecast

Issued 06:30 PM EDT 17 July 2026
Sunday Wind northwest 20 knots diminishing to light in the morning then becoming west 15 in the afternoon.
Monday Wind light becoming southwest 15 knots late in the day.
Tuesday Wind southwest 15 knots increasing to southwest 20.

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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

Eastern Lake Ontario

Issued 6:30 PM EDT 17 July 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 6:30 PM EDT 17 July 2026 Tonight and Saturday At 6:30 p.m. EDT tonight departing ridge located on a line
north-south over eastern Ontario.

At 6:30 p.m. EDT tonight low 1007 mb located over northwestern
Ontario.
By 6:30 p.m. EDT Saturday low 995 mb located over southern Quebec.

By 6:30 p.m. EDT Saturday 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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