FZUS61 KBUF 240804 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 404 AM EDT Tue Mar 24 2026 SLZ022-024-241500- Saint Lawrence River from Cape Vincent to Saint Regis 404 AM EDT Tue Mar 24 2026 .TODAY...Northwest winds 10 knots or less becoming southwest 10 to 15 knots. Sunny this morning, then becoming mostly cloudy. .TONIGHT...Southwest winds 5 to 15 knots becoming west. Mostly cloudy. .WEDNESDAY...Northwest winds less than 10 knots becoming south. A chance of rain and snow showers in the afternoon. .WEDNESDAY NIGHT...Southeast winds 10 knots or less. A chance of rain and snow showers in the evening, then rain and snow showers likely overnight. .THURSDAY...South winds 5 to 15 knots becoming northwest. Rain showers. .FRIDAY...Northwest winds 5 to 15 knots. Partly cloudy. .SATURDAY...West winds 5 to 10 knots. Partly to mostly cloudy. $$