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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EST 06 December 2025

Tonight and Sunday.

Wind west 20 knots veering to northwest 15 this evening then diminishing to variable 10 late overnight. Wind increasing to southwest 15 Sunday morning then veering to west 20 Sunday afternoon. Wind veering to northwest 20 Sunday evening.

Snow Sunday morning and afternoon changing to scattered flurries. Visibility 1 mile or less in snow.

Waves

Issued 06:30 PM EST 06 December 2025
Tonight and Sunday. Waves 1.5 metres subsiding to 0.5 to 1 near midnight and to 0.5 or less early Sunday morning. Waves building to 0.5 to 1 near noon Sunday and to 1.5 Sunday evening.

Extended Forecast

Issued 06:30 PM EST 06 December 2025
Monday Wind northwest 20 knots diminishing to light in the afternoon.
Tuesday Wind south 15 knots increasing to southwest 25 late in the day.
Wednesday Wind southwest 20 knots veering to northwest 15 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
Legend:
buoy Buoy
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 6:30 PM EST 6 December 2025 Tonight and Sunday At 6:30 p.m. EST tonight departing cold front located on a line
north-south over Ottawa.

At 6:30 p.m. EST tonight disturbance located over Iowa.
By 6:30 p.m. EST Sunday low 1015 mb located east of Lake Ontario.

At 6:30 p.m. EST tonight ridge located on a line northwest-southeast
over Saskatchewan.
By 6:30 p.m. EST Sunday ridge located on a line north-south over
Lake of the Woods.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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