FZUS61 KBUF 041403 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1003 AM EDT Mon May 4 2026 SLZ022-024-042100- Saint Lawrence River from Cape Vincent to Saint Regis 1003 AM EDT Mon May 4 2026 .THIS AFTERNOON...Southwest winds 10 to 15 knots. Partly to mostly sunny. .TONIGHT...Southwest winds 5 to 15 knots becoming south. A chance of showers after midnight. .TUESDAY...Southwest winds 10 to 15 knots increasing to 15 to 20 knots. Showers. .TUESDAY NIGHT...Southwest winds 10 knots or less. Showers in the evening, then rain likely overnight. .WEDNESDAY...West winds less than 10 knots becoming southwest. Rain likely during the day, then a chance of rain showers Wednesday night. .THURSDAY...West winds 10 knots or less. Mostly cloudy. .FRIDAY...West winds 5 to 15 knots becoming southwest. A chance of rain showers. $$