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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 16 July 2025

Tonight and Thursday.

Strong wind warning in effect.

Wind light becoming south 10 knots this evening then increasing to south 15 early Thursday morning. Wind increasing to west 25 near noon Thursday then veering to northwest 20 Thursday evening.

Scattered showers with a risk of thunderstorms.

Waves

Issued 06:30 PM EDT 16 July 2025
Tonight and Thursday. Waves 0.5 metres or less building to 0.5 to 1 Thursday morning and to 2 Thursday afternoon.

Extended Forecast

Issued 06:30 PM EDT 16 July 2025
Friday Wind northwest 20 knots diminishing to light in the morning.
Saturday Wind light.
Sunday Wind west 15 knots diminishing to light late in the day.

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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 9:58 PM EDT 16 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.

Warnings (Ended)

Squall warning ended

Eastern Lake Ontario

Issued 00:10 AM EDT 17 July 2025
Synopsis

Technical Marine Synopsis

Issued 6:30 PM EDT 16 July 2025 Tonight and Thursday At 6:30 p.m. EDT tonight low 1005 mb located over southern
Wisconsin.
By 6:30 p.m. EDT Thursday low 999 mb located over the St. Lawrence
River.

At 6:30 p.m. EDT tonight ridge located on a line east-west over
Lake Nipigon.
By 6:30 p.m. EDT Thursday ridge located on a line
northwest-southeast over western Lake Superior.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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