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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 06 December 2025

Today Tonight and Sunday.

Wind southwest 25 knots diminishing to northwest 15 this evening then veering to northeast 15 late overnight. Wind backing to north 15 Sunday afternoon then increasing to north 20 Sunday evening.

Scattered flurries ending this evening. Flurries Sunday afternoon and evening. Visibility 1 mile or less in flurries.

Waves

Issued 10:30 AM EST 06 December 2025
Today Tonight and Sunday. Waves 1.5 metres subsiding to 0.5 to 1 near midnight.

Extended Forecast

Issued 03:00 AM EST 06 December 2025
Monday Wind northwest 20 knots diminishing to light in the afternoon.
Tuesday Wind south 15 knots increasing to southwest 25.
Wednesday Wind southwest 25 knots diminishing to north 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 6 December 2025 Today Tonight and Sunday At 10:30 a.m. EST today departing cold front located on a line
northeast-southwest over Lake Nipissing.

At 10:30 a.m. EST today disturbance located over Kansas.
By 10:30 a.m. EST Sunday low 1015 mb located south of Georgian Bay.

At 10:30 a.m. EST today ridge located on a line northwest-southeast
over Saskatchewan.
By 10:30 a.m. EST Sunday ridge located on a line northwest-southeast
over southern Manitoba.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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