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Eastern Lake Ontario

Warnings

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Marine Forecast

Issued 03:00 AM EST 05 December 2025

Today Tonight and Saturday.

Wind variable 10 knots increasing to south 15 early this morning and to south 20 early this evening. Wind veering to southwest 20 overnight then to west 25 Saturday afternoon.

Scattered flurries Saturday.

Waves

Issued 03:00 AM EST 05 December 2025
Today Tonight and Saturday. Waves 0.5 metres or less building to 1 this morning and to 1.5 near noon Saturday.

Extended Forecast

Issued 03:00 AM EST 05 December 2025
Sunday Wind light increasing to northwest 20 knots late in the day.
Monday Wind northwest 20 knots diminishing to light.
Tuesday Wind south 15 knots increasing to southwest 30.

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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 EST 5 December 2025 Today Tonight and Saturday At 3:00 a.m. EST today ridge located on a line north-south over
Ottawa.
By 3:00 a.m. EST Saturday departing ridge located on a line
north-south over New Brunswick.

At 3:00 a.m. EST today cold front located on a line
northeast-southwest over southern Manitoba.
By 3:00 a.m. EST Saturday cold front located on a line
northeast-southwest over Sault Ste. Marie.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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