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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 13 December 2025

Today Tonight and Sunday.

Wind southwest 15 knots increasing to west 25 this morning then diminishing to west 15 near midnight. Wind veering to north 15 Sunday morning then backing to northwest 20 Sunday afternoon. Wind diminishing to northwest 15 Sunday evening.

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

Waves

Issued 03:00 AM EST 13 December 2025
Today Tonight and Sunday. Waves 1 metre building to 1.5 near noon then subsiding to 1 this evening.

Extended Forecast

Issued 03:00 AM EST 13 December 2025
Monday Wind northwest 15 knots increasing to southwest 25 in the afternoon.
Tuesday Wind southwest 25 knots.
Wednesday Wind southwest 25 knots diminishing to west 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 3:00 AM EST 13 December 2025 Today Tonight and Sunday At 3:00 a.m. EST today departing ridge located on a line north-south
over Montréal.

At 3:00 a.m. EST today low 1003 mb located over northeastern
Ontario.
By 3:00 a.m. EST Sunday low 1013 mb located over eastern Quebec.

At 3:00 a.m. EST today high 1039 mb located over southern
Saskatchewan.
By 3:00 a.m. EST Sunday approaching high 1045 mb located over
southeastern South Dakota.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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