FZUS61 KBUF 060810 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 410 AM EDT Mon Apr 6 2026 SLZ022-024-061500- Saint Lawrence River from Cape Vincent to Saint Regis 410 AM EDT Mon Apr 6 2026 .TODAY...West winds 5 to 15 knots. Mostly cloudy early, then becoming partly sunny. .TONIGHT...Northwest winds 10 knots or less becoming north. A chance of snow showers through the early overnight, then snow showers likely late. .TUESDAY...North winds 5 to 15 knots becoming northwest. A chance of snow showers. .TUESDAY NIGHT...West winds 10 knots or less becoming southwest. Mainly clear. .WEDNESDAY...Southwest winds 5 to 15 knots becoming south. Mainly clear, then becoming partly cloudy. .THURSDAY...South winds 10 to 15 knots increasing to 15 to 20 knots. A chance of rain showers Thursday night. .FRIDAY...Southwest winds 5 to 15 knots becoming west less than 10 knots. A chance of showers. $$