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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 15 December 2025

Today Tonight and Tuesday.

Wind west 15 knots increasing to southwest 25 near noon and to southwest 30 this afternoon. Wind veering to west 25 this evening then diminishing to west 15 late overnight. Wind backing to southwest 15 Tuesday morning then increasing to southwest 25 Tuesday evening.

Scattered flurries ending Tuesday afternoon.

Waves

Issued 10:30 AM EST 15 December 2025
Today Tonight and Tuesday. Waves 1 to 1.5 metres building to 2 to 3 this afternoon then subsiding to 1 early Tuesday morning. Waves building to 1.5 Tuesday evening.

Extended Forecast

Issued 03:00 AM EST 15 December 2025
Wednesday Wind southwest 30 knots diminishing to light late in the day.
Thursday Wind south 20 knots increasing to south 30.
Friday Wind southwest 35 knots diminishing to northwest 20 late in the day.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Burlington Lift Bridge Oshawa Executive Airport Point Pelee Peterborough Municipal Airport Point Petre Hamilton Munro Int'l Airport Erieau Cobourg Toronto City Centre Airport Port Colborne CFB Trenton South Lake Huron - 45149 Windsor Airport Great Duck Island Gore Bay-Manitoulin Airport North Bay Airport Greater Sudbury Airport Killarney Sault Ste. Marie Airport Ajax - 45159 North Channel - 45154 Lake Nipissing - 45152 Lake Simcoe - 45151 Welland-Pelham Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Vineland Station Brockville Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Cove Island Goderich Sarnia Chris Hadfield Airport Western Islands Tobermory Long Point Port Weller St. Catharines / Niagara District Airport Southeast Shoal
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land station Land Station
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 10:30 AM EST 15 December 2025 Today Tonight and Tuesday At 10:30 a.m. EST today ridge from high located on a line
north-south over Manitoba.
By 10:30 a.m. EST Tuesday ridge located on a line north-south over
eastern Quebec.

At 10:30 a.m. EST today departing trough located on a line
northeast-southwest over Lake Superior.

By 10:30 a.m. EST Tuesday approaching low 985 mb located over the
northern Ontario - Manitoba border.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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