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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EST 14 December 2025

Today Tonight and Monday.

Wind northwest 15 knots increasing to northwest 20 early this evening then diminishing to northwest 15 near midnight. Wind increasing to southwest 25 Monday morning and to southwest 30 near noon Monday. Wind diminishing to west 20 Monday evening.

Periods of snow Monday. Visibility 1 mile or less in snow.

Waves

Issued 10:30 AM EST 14 December 2025
Today Tonight and Monday. Waves 1 to 1.5 metres building to 2 near noon Monday and to 3 Monday afternoon.

Extended Forecast

Issued 03:00 AM EST 14 December 2025
Tuesday Wind southwest 20 knots increasing to southwest 25 late in the day.
Wednesday Wind southwest 25 knots diminishing to west 15 late in the day.
Thursday Wind south 15 knots increasing to south 25 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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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 14 December 2025 Today Tonight and Monday At 10:30 a.m. EST today high 1044 mb located over southwestern Iowa.
By 10:30 a.m. EST Monday high 1039 mb located over Kentucky.

By 10:30 a.m. EST Monday approaching trough located on a line
north-south over Lake Superior.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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