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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 08 December 2025

Today Tonight and Tuesday.

Wind variable 10 knots becoming southeast 10 early this evening then veering to south 10 near midnight. Wind increasing to south 15 late overnight and to south 20 Tuesday morning. Wind veering to southwest 25 Tuesday afternoon.

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

Waves

Issued 10:30 AM EST 08 December 2025
Today Tonight and Tuesday. Waves 0.5 metres or less building to 0.5 to 1 early Tuesday morning and to 1 to 1.5 near noon Tuesday. Waves building to 2 to 3 Tuesday evening.

Extended Forecast

Issued 03:00 AM EST 08 December 2025
Wednesday Wind southwest 20 knots veering to northwest 20 late in the day.
Thursday Wind northwest 20 knots.
Friday Wind west 15 knots backing to southwest 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
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 10:30 AM EST 8 December 2025 Today Tonight and Tuesday At 10:30 a.m. EST today ridge located on a line northeast-southwest
over northeastern Ontario.
By 10:30 a.m. EST Tuesday ridge located on a line
northeast-southwest over the Eastern Seaboard.

By 10:30 a.m. EST Tuesday low 1002 mb located over Lake Superior.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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