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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 21 July 2026

Today Tonight and Wednesday.

Strong wind warning in effect.

Wind south 15 knots increasing to southwest 20 this morning then veering to west 20 this evening. Wind diminishing to northwest 15 Wednesday afternoon.

Scattered showers today and this evening with a risk of thunderstorms.

Waves

Issued 03:00 AM EDT 21 July 2026
Today Tonight and Wednesday. Waves 0.5 to 1 metre building to 1 to 1.5 near midnight then subsiding to 0.5 to 1 Wednesday evening.

Extended Forecast

Issued 03:00 AM EDT 21 July 2026
Thursday Wind west 15 knots diminishing to light late in the day.
Friday Wind light.
Saturday Wind south 15 knots diminishing to light late in the day.

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Map of Great Lakes - Lake Huron marine weather areas Wiarton Airport Western Islands Cove Island Goderich Lake Simcoe Regional Airport Vineland Station Parry Sound Harbour Sarnia Chris Hadfield Airport Tobermory Muskoka Airport Harrow AAFC Long Point Port Weller St. Catharines / Niagara District Airport Lagoon City Southeast Shoal Burlington Lift Bridge Welland-Pelham Windsor Airport Port Colborne Erieau Peterborough Municipal Airport CFB Trenton Toronto City Centre Airport Point Petre Oshawa Executive Airport Hamilton Munro Int'l Airport Point Pelee Cobourg Port Colborne - 45142 North Channel - 45154 Ajax - 45159 Lake Nipissing - 45152 Sault Ste. Marie Airport Killarney Lake Simcoe - 45151 Greater Sudbury Airport South Lake Huron - 45149 Lake St Clair - 45147 North Bay Airport South Georgian Bay - 45143 Gore Bay-Manitoulin Airport Grimsby - 45139 Georgian Bay - 45137 Great Duck Island Collingwood Kingston Airport Grenadier Island Brockville Prince Edward Point - 45135 Port Stanley - 45132
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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

Warnings (In effect)

Strong wind warning in effect

Western Lake Ontario

Issued 03:00 AM EDT 21 July 2026

'Strong' winds of 20 to 33 knots are occurring or expected to occur in this marine area. Please refer to the latest marine forecasts for further details and continue to monitor the situation through Canadian Coast Guard radio.

Synopsis

Technical Marine Synopsis

Issued 3:00 AM EDT 21 July 2026 Today Tonight and Wednesday At 3:00 a.m. EDT today trough from 991 mb low located on a line
northeast-southwest over eastern Lake Superior.
By 3:00 a.m. EDT Wednesday trough from 994 mb low located on a
line north-south over eastern Ontario.

By 3:00 a.m. EDT Wednesday ridge located on a line
northwest-southeast over North Dakota.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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