


Great Lakes Forecast
Issued by NWS
Issued by NWS
951 FZUS63 KDTX 291952 GLFSC Lake St Clair Forecast National Weather Service Detroit/Pontiac MI 352 PM EDT Mon Sep 29 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...High pressure, 30.20 inches, is now over the eastern Great Lakes while a second high builds across Ontario. A cold front drops into the northern Great Lakes tonight shifting winds to the northeast. Dry weather is expected through the forecast period. LCZ460-300400- Lake St Clair- 352 PM EDT Mon Sep 29 2025 .TONIGHT...Light and variable winds becoming northeast 5 to 10 knots early in the morning. Clear. Waves nearly calm. .TUESDAY...Northeast winds 5 to 10 knots increasing to 10 to 15 knots late in the afternoon. Sunny. Waves 2 feet or less. .TUESDAY NIGHT...Northeast winds 10 to 15 knots increasing to 15 to 20 knots in the late evening and overnight. Clear. Waves 1 to 3 feet. .WEDNESDAY...Northeast winds 15 to 20 knots becoming east 10 to 15 knots in the late morning and afternoon. Mostly sunny. Waves 1 to 3 feet. .WEDNESDAY NIGHT...East winds 10 to 15 knots. Partly cloudy. Waves 2 feet or less. .THURSDAY...East winds 10 to 15 knots becoming southeast 5 to 10 knots in the afternoon and evening. Partly cloudy. Waves 2 feet or less. .FRIDAY...South winds 5 to 10 knots. Clear. Waves 2 feet or less. .SATURDAY...South winds 10 to 15 knots. Clear. Waves 2 feet or less. $$ MV Experimental modernized open lake forecast is available online at weather.gov/dtx/glftablesc Graphical marine forecasts are available at weather.gov/greatlakes