FZUS61 KBUF 060803 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 AM EDT Wed May 6 2026 SLZ022-024-061500- Saint Lawrence River from Cape Vincent to Saint Regis 403 AM EDT Wed May 6 2026 .TODAY...Northwest winds 5 to 10 knots becoming northeast. Showers through early afternoon. .TONIGHT...Southwest winds 10 knots or less. Mostly cloudy through the early overnight, then becoming partly cloudy. .THURSDAY...West winds 5 to 15 knots becoming southwest. Mostly sunny. .THURSDAY NIGHT...Southwest winds 5 to 15 knots diminishing to less than 10 knots. Partly to mostly cloudy. .FRIDAY...Southwest winds 5 to 10 knots. A chance of rain showers Friday night. .SATURDAY...Southwest winds 5 to 15 knots becoming south. A chance of rain showers. .SUNDAY...Southwest winds 10 knots or less becoming west. A chance of showers. $$