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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 18 July 2026

Today Tonight and Sunday.

Strong wind warning in effect.

Wind southwest 20 knots veering to west 25 this afternoon then to northwest 20 this evening. Wind diminishing to northwest 15 late overnight and to west 10 near noon Sunday. Wind increasing to west 15 Sunday afternoon then diminishing to northwest 10 Sunday evening.

Scattered showers ending this evening with a risk of thunderstorms. Smoke dissipating this afternoon. Visibility as low as 1 mile in smoke.

Waves

Issued 10:30 AM EDT 18 July 2026
Today Tonight and Sunday. Waves 1 to 1.5 metres.

Extended Forecast

Issued 03:00 AM EDT 18 July 2026
Monday Wind light becoming southwest 15 knots late in the day.
Tuesday Wind southwest 15 knots increasing to southwest 20.
Wednesday Wind northwest 20 knots.

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

Eastern Lake Ontario

Issued 10:30 AM EDT 18 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.

Watches (In effect)

Squall watch in effect

Eastern Lake Ontario

Issued 09:06 AM EDT 18 July 2026 Conditions are favourable for the development of squalls with wind gusts up to 55 knots, frequent lightning, hail and poor to very poor visibility in thunderstorms heavy at times.

Thunderstorms are expected today with strong wind gusts. The strongest thunderstorms are expected this afternoon as a cold front moves through from the northwest.

Large hail can damage vessels and cause injury. Vessels without lightning protection should make their way to shore immediately. Consider delaying or postponing travel in areas under the Squall Watch.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 18 July 2026 Today Tonight and Sunday At 10:30 a.m. EDT today low 999 mb located north of Lake Nipissing.
By 10:30 a.m. EDT Sunday low 986 mb located over eastern Quebec.

At 10:30 a.m. EDT today ridge located on a line north-south over
North Dakota.
By 10:30 a.m. EDT Sunday ridge located on a line north-south over
Lake Michigan.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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