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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 03:00 AM EDT 12 September 2026

Today Tonight and Sunday.

Strong wind warning in effect.

Wind southeast 10 knots increasing to southwest 15 this evening then veering to northwest 15 Sunday morning. Wind diminishing to west 10 near noon Sunday then increasing to west 15 Sunday afternoon. Wind increasing to northwest 20 Sunday evening.

Scattered showers tonight with a risk of thunderstorms. Scattered showers Sunday evening.

Waves

Issued 03:00 AM EDT 12 September 2026
Today Tonight and Sunday. Waves 0.5 metres or less building to 0.5 to 1 near midnight then subsiding to 0.5 or less near noon Sunday. Waves building to 0.5 to 1 Sunday evening.

Extended Forecast

Issued 03:00 AM EDT 12 September 2026
Monday Wind north 15 knots diminishing to light in the morning.
Tuesday Wind south 15 knots increasing to south 20.
Wednesday Wind southwest 15 knots diminishing to light.

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

Warnings (In effect)

Strong wind warning in effect

Western Lake Ontario

Issued 03:00 AM EDT 12 September 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 12 September 2026 Today Tonight and Sunday At 3:00 a.m. EDT today ridge located on a line northeast-southwest
over the southern St. Lawrence River.
By 3:00 a.m. EDT Sunday ridge located east of Nova Scotia.

At 3:00 a.m. EDT today cold front from 988 mb low located on a
line northeast-southwest over northwestern Ontario.
By 3:00 a.m. EDT Sunday cold front from 988 mb low located on a
line northeast-southwest over central Ontario.

Great Lakes - Lake Huron Area

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Marine Weather for Canada

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