FZUS61 KBUF 062010 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 410 PM EDT Mon Apr 6 2026 SLZ022-024-070300- Saint Lawrence River from Cape Vincent to Saint Regis 410 PM EDT Mon Apr 6 2026 .TONIGHT...West winds 5 to 10 knots becoming northeast. A chance of snow showers early. Snow showers late. .TUESDAY...Northeast winds 5 to 15 knots becoming northwest. Snow showers in the morning, then a chance of snow showers early in the afternoon. .TUESDAY NIGHT...Northwest winds 5 to 10 knots becoming light and variable. Mainly clear. .WEDNESDAY...Southwest winds 10 knots or less. Sunny. .WEDNESDAY NIGHT...South winds 10 knots or less increasing to 10 to 15 knots. Mainly clear. .THURSDAY...South winds 15 to 20 knots becoming southwest 10 to 15 knots. A chance of rain showers Thursday night. .FRIDAY...Southwest winds 10 knots or less becoming northwest. A chance of rain showers. .SATURDAY...Northwest winds 10 knots or less becoming north. A chance of rain showers during the day. $$