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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 11 June 2026

Today Tonight and Friday.

Strong wind warning in effect.

Wind southwest 15 knots diminishing to southwest 10 this afternoon then becoming variable 10 late overnight. Wind increasing to southwest 15 Friday morning and to southwest 20 Friday afternoon. Wind diminishing to west 15 Friday evening.

Scattered showers ending this evening with a risk of thunderstorms. Scattered showers overnight and Friday with a risk of thunderstorms. Fog patches dissipating Friday afternoon.

Waves

Issued 10:30 AM EDT 11 June 2026
Today Tonight and Friday. Waves 0.5 metres or less building to 0.5 to 1 near noon then subsiding to 0.5 or less early this evening. Waves building to 0.5 to 1 near noon Friday and to 1 to 1.5 Friday evening.

Extended Forecast

Issued 03:00 AM EDT 11 June 2026
Saturday Wind light becoming west 15 knots in the morning.
Sunday Wind southwest 15 knots veering to northwest 15.
Monday Wind west 15 knots.

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Map of Great Lakes - Lake Erie and Lake Ontario marine weather areas CFB Trenton Port Colborne - 45142 Hamilton Munro Int'l Airport Oshawa Executive Airport Port Stanley - 45132 Lake Nipissing - 45152 Point Petre Georgian Bay - 45137 Toronto City Centre Airport Lake Simcoe - 45151 South Georgian Bay - 45143 Prince Edward Point - 45135 Peterborough Municipal Airport South Lake Huron - 45149 Collingwood Lake St Clair - 45147 Grimsby - 45139 Goderich Lagoon City Kingston Airport Muskoka Airport Parry Sound Harbour Grenadier Island Lake Simcoe Regional Airport Wiarton Airport Brockville Western Islands Cove Island Great Duck Island North Channel - 45154 Sarnia Chris Hadfield Airport Gore Bay-Manitoulin Airport Tobermory Harrow AAFC Long Point North Bay Airport Port Weller St. Catharines / Niagara District Airport Greater Sudbury Airport Southeast Shoal Vineland Station Port Colborne Erieau Cobourg Sault Ste. Marie Airport Windsor Airport Welland-Pelham Killarney Ajax - 45159 Point Pelee Burlington Lift Bridge
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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 10:30 AM EDT 11 June 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 10:30 AM EDT 11 June 2026 Today Tonight and Friday At 10:30 a.m. EDT today quasi-stationary low 988 mb located over
northern Manitoba.

At 10:30 a.m. EDT today trough located on a line northeast-southwest
over Iowa.
By 10:30 a.m. EDT Friday trough located on a line
northeast-southwest over western Lake Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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