


Great Lakes Forecast
Issued by NWS
Issued by NWS
912 FZUS63 KDTX 150748 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 348 AM EDT Wed Oct 15 2025 Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS...Northeast flow backs to northwest by the late afternoon and evening hours in the wake of a cold front. Expansive high pressure, 30.30 inches, will then build into the Great Lakes through and will last through Thursday. LCZ460-151600- Lake St Clair- 348 AM EDT Wed Oct 15 2025 .TODAY...North winds 10 to 15 knots diminishing to 5 to 10 knots in the late morning and early afternoon...then increasing to 10 to 15 knots late in the afternoon. Mostly cloudy until late afternoon becoming mostly sunny. Waves 2 feet or less. .TONIGHT...North winds 10 to 15 knots diminishing to 5 to 10 knots after midnight. Clear. Waves 2 feet or less. .THURSDAY...North winds 5 to 10 knots until late afternoon becoming light and variable. Sunny. Waves 2 feet or less. .THURSDAY NIGHT...Light and variable winds. Clear. Waves nearly calm. .FRIDAY...South winds 5 to 10 knots increasing to 10 to 15 knots in the evening. Mostly sunny becoming partly sunny in the afternoon becoming mostly cloudy. A chance of light showers in the evening. Waves 2 feet or less. .SATURDAY...South winds 15 to 20 knots. Light showers. Waves 1 to 3 feet. .SUNDAY...West winds 20 to 25 knots with gusts to 30 knots. Light showers. Waves 2 to 4 feet. A Small Craft Advisory may be needed. $$ TF Experimental modernized open lake forecast is available online at weather.gov/dtx/glftablesc Graphical marine forecasts are available at weather.gov/greatlakes