Great Lakes - Western Lake Ontario Marine Forecast and Alerts

Canada

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Current Conditions

Canada 7 Day High and Low Temperatures Forecast

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Lake St. Clair

Marine Forecast

Issued 03:00 AM EDT 04 October 2026

Today Tonight and Monday.

Strong wind warning in effect.

Wind light becoming southwest 10 knots near noon then increasing to southwest 15 early this evening. Wind veering to northwest 15 late this evening then increasing to northwest 20 overnight. Wind diminishing to northwest 15 near noon Monday and to light Monday evening.

Fog patches dissipating this morning.

Winds

Issued 03:00 AM EDT 04 October 2026

Today Tonight and Monday. Strong wind warning in effect. Wind light becoming southwest 10 knots near noon then increasing to southwest 15 early this evening. Wind veering to northwest 15 late this evening then increasing to northwest 20 overnight. Wind diminishing to northwest 15 near noon Monday and to light Monday evening.

Waves

Issued 03:00 AM EDT 04 October 2026

Today Tonight and Monday. Waves 0.5 metres or less building to 0.5 to 1 this evening.

Weather & Visibility

Issued 03:00 AM EDT 04 October 2026

Today Tonight and Monday. Fog patches dissipating this morning.

Ice Forecasts

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

Warnings (In effect)

Strong wind warning in effect

Lake St. Clair

Issued 03:00 AM EDT 04 October 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 3:00 AM EDT 4 October 2026 Today Tonight and Monday At 3:00 a.m. EDT today departing high 1030 mb located near Maine.

At 3:00 a.m. EDT today trough located on a line north-south over
western Lake Superior.
By 3:00 a.m. EDT Monday trough located on a line northeast-southwest
over eastern Lake Ontario.

At 3:00 a.m. EDT today low 1010 mb located over northwestern
Ontario.
By 3:00 a.m. EDT Monday low 998 mb located east of James Bay.

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