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Eastern Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 06:30 PM EDT 27 July 2026

Tonight and Tuesday.

Wind south 10 knots backing to southeast 10 this evening then increasing to south 15 late overnight. Wind backing to southeast 15 Tuesday morning then increasing to north 15 to 20 Tuesday afternoon.

Scattered showers with a risk of thunderstorms.

Waves

Issued 06:30 PM EDT 27 July 2026
Tonight and Tuesday. Waves 0.5 metres or less building to 0.5 to 1 early Tuesday morning.

Extended Forecast

Issued 06:30 PM EDT 27 July 2026
Wednesday Wind northeast 15 knots backing to north 15 to 20 in the morning then becoming north 15 late in the day.
Thursday Wind north 15 knots diminishing to light.
Friday Wind light.

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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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buoy Buoy
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)

Squall warning in effect

Eastern Lake Ontario

Issued 01:46 AM EDT 28 July 2026 Squalls with wind gusts up to 35 knots and frequent lightning are expected or occurring in the area.

Thunderstorms will continue to move southeastward across the area tonight.

Vessels without lightning protection should make their way to shore immediately. Mariners are advised to prepare for squalls. If underway, seek safe harbour immediately. Consider delaying or postponing travel in areas under the squall warning.

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 6:30 PM EDT 27 July 2026 Tonight and Tuesday At 6:30 p.m. EDT tonight low 1002 mb located over eastern Wisconsin.
By 6:30 p.m. EDT Tuesday low 999 mb located over eastern Lake
Ontario.

At 6:30 p.m. EDT tonight ridge located on a line north-south over
northwestern Ontario.
By 6:30 p.m. EDT Tuesday ridge located on a line north-south over
Lake Superior.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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