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Eastern Lake Ontario

Forecast

Marine Forecast

Issued 03:00 AM EDT 13 July 2025

Today Tonight and Monday.

Wind south 15 knots veering to southwest 15 this morning then diminishing to south 10 this evening. Wind becoming light near midnight then becoming southwest 10 Monday morning.

Scattered showers ending near midnight with a risk of thunderstorms.

Waves

Issued 03:00 AM EDT 13 July 2025
Today Tonight and Monday. Waves 0.5 to 1 metre subsiding to 0.5 or less near midnight.

Extended Forecast

Issued 03:00 AM EDT 13 July 2025
Tuesday Wind light.
Wednesday Wind light.
Thursday Wind light becoming southwest 15 knots.

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Weather Conditions

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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

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 13 July 2025 Today Tonight and Monday At 3:00 a.m. EDT today trough from 999 mb low located from James
Bay to Lower Michigan.
By 3:00 a.m. EDT Monday departing trough from 988 mb low located
from Hudson Bay to Labrador.

At 3:00 a.m. EDT today ridge from 1018 mb high located from Kansas
to Minnesota.
By 3:00 a.m. EDT Monday ridge from 1016 mb high located from
Illinois to Georgian Bay.

Great Lakes - Lake Huron Area

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