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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 09 August 2026

Today Tonight and Monday.

Wind west 15 to 20 knots becoming southwest 15 near noon then diminishing to southwest 10 early this evening. Wind backing to south 10 near midnight then increasing to southwest 15 early Monday morning.

Scattered showers Monday with a risk of thunderstorms.

Waves

Issued 10:30 AM EDT 09 August 2026
Today Tonight and Monday. Waves 0.5 to 1 metre subsiding to 0.5 or less this evening then building to 0.5 to 1 Monday morning.

Extended Forecast

Issued 03:00 AM EDT 09 August 2026
Tuesday Wind west 15 knots diminishing to light in the morning.
Wednesday Wind light.
Thursday Wind light becoming northwest 15 knots late in the day.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas Harrow AAFC Hamilton Munro Int'l Airport CFB Trenton Erieau Toronto City Centre Airport Point Pelee Peterborough Municipal Airport Burlington Lift Bridge Point Petre Cobourg Oshawa Executive Airport South Lake Huron - 45149 Port Colborne Brockville 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 Windsor Airport Lake St Clair - 45147 South Georgian Bay - 45143 Port Colborne - 45142 Grimsby - 45139 Georgian Bay - 45137 Prince Edward Point - 45135 Port Stanley - 45132 Welland-Pelham Grenadier Island Kingston Airport Collingwood Lagoon City Muskoka Airport Parry Sound Harbour Lake Simcoe Regional Airport Wiarton Airport Western Islands Sarnia Chris Hadfield Airport Vineland Station Southeast Shoal St. Catharines / Niagara District Airport Goderich Port Weller Long Point Tobermory
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Ice Conditions

*Ice Forecast and Warnings also apply to U.S. waters

Ice Forecasts

Issued 12:00 PM EDT 17 May 2026 Forecasts have ended for the season.
Warnings

No watches or warnings in effect.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 9 August 2026 Today Tonight and Monday At 10:30 a.m. EDT today dissipating cold front located on a line
northeast-southwest over the East Coast of the U.S.

At 10:30 a.m. EDT today ridge located on a line north-south over
Lake Erie.
By 10:30 a.m. EDT Monday ridge located on a line northeast-southwest
over Virginia.

At 10:30 a.m. EDT today low 1007 mb located over Kansas.
By 10:30 a.m. EDT Monday low 1010 mb located near Lake Nipissing.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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