FZUS61 KBUF 042003 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 PM EDT Mon May 4 2026 SLZ022-024-050300- Saint Lawrence River from Cape Vincent to Saint Regis 403 PM EDT Mon May 4 2026 .TONIGHT...Southwest winds 15 to 20 knots becoming south 5 to 15 knots. Partly to mostly cloudy. .TUESDAY...Southwest winds 10 to 15 knots. A chance of showers early, then showers from late morning on. .TUESDAY NIGHT...West winds 10 knots or less becoming southwest. Showers in the evening, then rain overnight. .WEDNESDAY...Southwest winds less than 10 knots becoming northwest. Rain in the morning, then showers likely in the afternoon. .WEDNESDAY NIGHT...West winds less than 10 knots becoming southwest. A chance of rain showers in the evening. .THURSDAY...West winds 10 knots or less. Partly to mostly cloudy. .FRIDAY...West winds 10 knots or less becoming southwest. A chance of rain showers. .SATURDAY...Southwest winds 10 knots or less. A chance of rain showers. $$