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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 18 June 2026

Today Tonight and Friday.

Strong wind warning in effect.

Wind southwest 30 knots veering to west 25 this evening. Wind west 25 Friday.

Scattered showers ending this evening with a risk of thunderstorms. Scattered showers Friday late in the day with a risk of thunderstorms.

Waves

Issued 10:30 AM EDT 18 June 2026
Today Tonight and Friday. Waves 2 to 3 metres subsiding to 2 near midnight and to 1.5 Friday evening.

Extended Forecast

Issued 03:00 AM EDT 18 June 2026
Saturday Wind west 20 knots diminishing to light late in the day.
Sunday Wind light.
Monday Wind light increasing to northeast 20 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

Eastern Lake Ontario

Issued 10:30 AM EDT 18 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.

Watches (In effect)

Squall watch in effect

Eastern Lake Ontario

Issued 12:11 PM EDT 18 June 2026 Conditions are favourable for the development of squalls with wind gusts up to 45 knots and frequent lightning.

Thunderstorm development is still possible into this afternoon.

Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.

Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Synopsis

Technical Marine Synopsis

Issued 10:30 AM EDT 18 June 2026 Today Tonight and Friday At 10:30 a.m. EDT today low 991 mb located over eastern Ontario.
By 10:30 p.m. EDT Friday departing low 990 mb located over the
Gulf of St. Lawrence.

By 10:30 a.m. EDT Friday ridge located on a line north-south over
northwestern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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