Great Lakes - Western Lake Ontario Marine Forecast and Alerts

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Western Lake Ontario

Marine Forecast

Issued 10:30 AM EDT 09 September 2026

Today Tonight and Thursday.

Strong wind warning in effect.

Wind variable 10 knots increasing to southwest 15 near noon and to southwest 20 this afternoon. Wind diminishing to west 15 late overnight then veering to northwest 10 to 15 Thursday evening.

Scattered showers ending this evening with a risk of thunderstorms.

Winds

Issued 10:30 AM EDT 09 September 2026

Today Tonight and Thursday. Strong wind warning in effect. Wind variable 10 knots increasing to southwest 15 near noon and to southwest 20 this afternoon. Wind diminishing to west 15 late overnight then veering to northwest 10 to 15 Thursday evening.

Waves

Issued 10:30 AM EDT 09 September 2026

Today Tonight and Thursday. Waves 0.5 metres or less building to 0.5 to 1 near noon and to 1 to 1.5 early this evening. Waves subsiding to 0.5 to 1 early Thursday morning and to 0.5 Thursday evening.

Weather & Visibility

Issued 10:30 AM EDT 09 September 2026

Today Tonight and Thursday. Scattered showers ending this evening with a risk of thunderstorms.

Ice Forecasts

Issued 12:00 PM EDT 17 May 2026 Forecasts have ended for the season.

Warnings (In effect)

Strong wind warning in effect

Western Lake Ontario

Issued 10:30 AM EDT 09 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.

Technical Marine Synopsis

Issued 10:30 AM EDT 9 September 2026 Today Tonight and Thursday At 10:30 a.m. EDT today departing ridge located on a line
northeast-southwest over the Gulf of St. Lawrence.

At 10:30 a.m. EDT today low 986 mb located over southern Hudson Bay.
By 10:30 a.m. EDT Thursday low 982 mb located east of Hudson Bay.

At 10:30 a.m. EDT today cold front from low located on a line
northeast-southwest over eastern Lake Superior.
By 10:30 a.m. EDT Thursday cold front from low located on a line
northeast-southwest over New England.

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