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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 08 August 2026

Today Tonight and Sunday.

Wind southwest 10 knots increasing to west 15 this evening then diminishing to southwest 10 Sunday evening.

Scattered showers ending overnight with a risk of thunderstorms. Fog patches dissipating near noon.

Waves

Issued 10:30 AM EDT 08 August 2026
Today Tonight and Sunday. Waves less than 0.5 metres building to 0.5 or less near noon and to 0.5 to 1 near midnight. Waves subsiding to 0.5 or less Sunday evening.

Extended Forecast

Issued 03:00 AM EDT 08 August 2026
Monday Wind light becoming southwest 15 knots in the morning.
Tuesday Wind northwest 15 knots diminishing to light late in the day.
Wednesday Wind light.

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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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land station Land Station
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 8 August 2026 Today Tonight and Sunday At 10:30 a.m. EDT today cold front located on a line
northeast-southwest over Lake Huron.
By 10:30 a.m. EDT Sunday cold front located over southern Quebec.

At 10:30 a.m. EDT today ridge from high located on a line
northwest-southeast over southern Minnesota.
By 10:30 a.m. EDT Sunday ridge from high located on a line
north-south over southern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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