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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 20 July 2026

Today Tonight and Tuesday.

Strong wind warning in effect.

Wind northwest 15 knots diminishing to light early this morning then becoming southeast 10 this afternoon. Wind increasing to south 15 near midnight and to south 20 Tuesday morning. Wind veering to southwest 20 Tuesday afternoon.

Scattered showers Tuesday afternoon and evening with a risk of thunderstorms.

Waves

Issued 03:00 AM EDT 20 July 2026
Today Tonight and Tuesday. Waves 0.5 metres or less building to 1 Tuesday morning.

Extended Forecast

Issued 03:00 AM EDT 20 July 2026
Wednesday Wind northwest 20 knots backing to west 25 in the morning.
Thursday Wind west 20 knots.
Friday Wind southwest 15 knots diminishing to light.

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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

Eastern Lake Ontario

Issued 03:00 AM EDT 20 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 20 July 2026 Today Tonight and Tuesday At 3:00 a.m. EDT today departing high 1016 mb located over southern
Ontario.

At 3:00 a.m. EDT today low 998 mb located over Manitoba.
By 3:00 a.m. EDT Tuesday low 997 mb located over northern Ontario.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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