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Western Lake Ontario

Warnings

Forecast

Marine Forecast

Issued 10:30 AM EDT 27 July 2026

Today Tonight and Tuesday.

Wind light becoming southeast 10 knots early this evening then veering to southwest 10 late overnight. Wind increasing to northeast 15 Tuesday morning then backing to north 15 Tuesday evening.

Scattered showers this afternoon tonight and Tuesday with a risk of thunderstorms.

Waves

Issued 10:30 AM EDT 27 July 2026
Today Tonight and Tuesday. Waves 0.5 metres or less building to 0.5 to 1 near noon Tuesday.

Extended Forecast

Issued 03:00 AM EDT 27 July 2026
Wednesday Wind northeast 15 knots backing to north 15 to 20 in the morning.
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

Watches (In effect)

Squall watch in effect

Western Lake Ontario

Issued 3:08 PM EDT 27 July 2026 Thunderstorms will be capable of producing wind gusts up to 40 knots and small hail this afternoon and evening.

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 27 July 2026 Today Tonight and Tuesday At 10:30 a.m. EDT today low 1002 mb located over northwestern
Wisconsin.
By 10:30 a.m. EDT Tuesday low 998 mb located over eastern Lake Erie.

By 10:30 a.m. EDT Tuesday ridge located on a line
northeast-southwest over northwestern Ontario.

Great Lakes - Lake Erie and Lake Ontario Area

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Marine Weather for Canada

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