FZUS61 KBUF 022003 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 PM EDT Sat May 2 2026 SLZ022-024-030300- Saint Lawrence River from Cape Vincent to Saint Regis 403 PM EDT Sat May 2 2026 .TONIGHT...Southwest winds 10 knots or less becoming west. Partly to mostly cloudy. .SUNDAY...West winds 10 knots or less becoming southwest 10 to 15 knots. Mostly sunny. .SUNDAY NIGHT...Southwest winds 5 to 15 knots. A chance of showers in the evening, then showers likely overnight. .MONDAY...Southwest winds 10 to 15 knots increasing to 15 to 20 knots. Showers likely in the morning. .MONDAY NIGHT...Southwest winds 5 to 15 knots becoming south. Partly to mostly cloudy. .TUESDAY...Southwest winds 5 to 15 knots becoming west less than 10 knots. Showers likely. .WEDNESDAY...West winds 10 knots or less becoming southwest. Showers likely during the day, then a chance of showers Wednesday night. .THURSDAY...Northeast winds 10 knots or less becoming west 10 to 15 knots. Showers likely. $$