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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 08:29 AM EST 09 December 2025

Today Tonight and Wednesday.

Wind south 20 knots veering to southwest 25 early this evening then backing to south 20 early Wednesday morning. Wind veering to southwest 25 Wednesday afternoon then to northwest 25 Wednesday evening.

Flurries near the east end late this morning. Snow beginning this afternoon becoming rain or snow near noon Wednesday. Visibility 1 mile or less in precipitation.

Waves

Issued 03:00 AM EST 09 December 2025
Today Tonight and Wednesday. Waves 0.5 to 1 metre building to 1 to 1.5 near noon and to 2 to 3 this evening. Waves subsiding to 1.5 overnight then building to 2 to 3 Wednesday evening.

Extended Forecast

Issued 03:00 AM EST 09 December 2025
Thursday Wind northwest 25 knots.
Friday Wind northwest 20 knots backing to southwest 15 late in the day.
Saturday Wind southwest 15 knots increasing to southwest 20.

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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 9 December 2025 Today Tonight and Wednesday At 3:00 a.m. EST today departing ridge located on a line
northeast-southwest over eastern Ontario.

At 3:00 a.m. EST today low 1006 mb located west of Lake Superior.
By 3:00 a.m. EST Wednesday dissipating low 1001 mb located over
northeastern Ontario.

By 3:00 a.m. EST Wednesday approaching low 989 mb located over
Wisconsin.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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