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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EST 12 December 2025

Today Tonight and Saturday.

Wind west 25 knots backing to southwest 20 this evening then increasing to southwest 30 Saturday afternoon. Wind veering to west 25 Saturday evening.

Scattered flurries beginning this afternoon changing to snow overnight then to scattered flurries Saturday evening. Visibility 1 mile or less in precipitation.

Waves

Issued 06:50 AM EST 12 December 2025
Today Tonight and Saturday. Waves 2 metres subsiding to 1 to 1.5 near midnight then building to 2 near noon Saturday.

Extended Forecast

Issued 03:00 AM EST 12 December 2025
Sunday Wind northwest 15 knots increasing to northwest 20 in the afternoon.
Monday Wind northwest 20 knots.
Tuesday Wind west 30 knots diminishing to southwest 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 12 December 2025 Today Tonight and Saturday At 3:00 a.m. EST today departing low 980 mb located over
northeastern Quebec.

At 3:00 a.m. EST today ridge located on a line north-south over
northwestern Ontario.
By 3:00 a.m. EST Saturday ridge located on a line north-south over
southern Quebec.

At 3:00 a.m. EST today trough located on a line north-south over
the Ontario - Manitoba border.
By 3:00 a.m. EST Saturday trough located on a line north-south
over Lake Huron.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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