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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 17 July 2025

Today Tonight and Friday.

Strong wind warning in effect.

Wind south 15 knots increasing to southwest 20 this morning then veering to west 25 near noon. Wind veering to northwest 20 this evening then diminishing to north 15 overnight. Wind diminishing to light Friday morning.

Scattered showers ending this evening with a risk of thunderstorms.

Waves

Issued 03:00 AM EDT 17 July 2025
Today Tonight and Friday. Waves 0.5 to 1 metre building to 2 near noon then subsiding to 1 near midnight. Waves subsiding to less than 0.5 near noon Friday.

Extended Forecast

Issued 03:00 AM EDT 17 July 2025
Saturday Wind light.
Sunday Wind light becoming northwest 15 knots late in the day.
Monday Wind north 15 knots diminishing to light.

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

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 16 May 2025 Forecasts have ended for the season.
Warnings

Warnings (In effect)

Strong wind warning in effect

Eastern Lake Ontario

Issued 03:00 AM EDT 17 July 2025

'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 or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 17 July 2025 Today Tonight and Friday At 3:00 a.m. EDT today low 1005 mb located over northeastern
Lower Michigan.
By 3:00 a.m. EDT Friday low 999 mb located over eastern Quebec.

At 3:00 a.m. EDT today high 1022 mb located over North Dakota.
By 3:00 a.m. EDT Friday high 1022 mb located over central Lake
Michigan.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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