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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 17 December 2025

Today Tonight and Thursday.

Gale warning in effect.

Wind southwest 30 knots increasing to southwest 35 near noon then diminishing to west 25 early this evening. Wind diminishing to west 15 late this evening then backing to southwest 15 near midnight. Wind backing to south 15 Thursday morning then increasing to south 20 near noon Thursday. Wind increasing to south 30 Thursday evening.

Scattered showers today and this evening. Rain Thursday evening.

Waves

Issued 03:00 AM EST 17 December 2025
Today Tonight and Thursday. Waves 2 to 3 metres subsiding to 1 to 1.5 near midnight.

Extended Forecast

Issued 03:00 AM EST 17 December 2025
Friday Wind south 25 knots increasing to west 40 in the afternoon.
Saturday Wind northwest 25 knots diminishing to south 15.
Sunday Wind southwest 20 knots veering to west 25.

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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

Warnings (In effect)

Gale warning in effect

Eastern Lake Ontario

Issued 03:00 AM EST 17 December 2025

'Gale' force winds of 34 to 47 knots are occurring or expected to occur in this marine area. Watch for updated statements. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EST 17 December 2025 Today Tonight and Thursday At 3:00 a.m. EST today departing trough from low located on a line
northeast-southwest over Sault Ste. Marie.

At 3:00 a.m. EST today ridge located on a line north-south over
Lake of the Woods.
By 3:00 a.m. EST Thursday ridge located on a line north-south
over Montréal.

By 3:00 a.m. EST Thursday low 982 mb located near Lake of the Woods.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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