FZUS61 KBUF 050903 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 AM EST Thu Nov 5 2026 SLZ022-024-051600- Saint Lawrence River from Cape Vincent to Saint Regis 403 AM EST Thu Nov 5 2026 .TODAY...South winds 5 to 15 knots becoming southwest. Showers this morning, then a chance of showers early this afternoon. .TONIGHT...Southwest winds 10 knots or less. Mostly cloudy. .FRIDAY...Light and variable winds. A chance of showers. .FRIDAY NIGHT...Light and variable winds becoming northeast 5 to 10 knots. A chance of showers in the evening, then showers likely overnight. .SATURDAY...Northeast winds 5 to 10 knots becoming northwest. Rain showers likely. .SUNDAY...West winds 5 to 10 knots. A chance of rain showers. .MONDAY...West winds 5 to 10 knots becoming southwest. A chance of rain showers during the day. $$