FZUS61 KBUF 082003 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 PM EDT Mon Jun 8 2026 SLZ022-024-090300- Saint Lawrence River from Cape Vincent to Saint Regis 403 PM EDT Mon Jun 8 2026 .TONIGHT...Southwest winds less than 10 knots. Mainly clear. .TUESDAY...Southwest winds 10 knots or less. Mostly sunny. .TUESDAY NIGHT...Southwest winds less than 10 knots. A chance of showers overnight. .WEDNESDAY...South winds 5 to 10 knots. Showers in the morning, then showers with a chance of thunderstorms in the afternoon. .WEDNESDAY NIGHT...Southwest winds 10 knots or less. Showers with a chance of thunderstorms in the evening, then showers likely overnight. .THURSDAY...Southwest winds 10 knots or less. A chance of showers and thunderstorms. .FRIDAY...South winds 5 to 10 knots becoming southwest. Showers likely with a chance of thunderstorms. .SATURDAY...Southwest winds 10 knots or less. Mainly clear, then becoming partly cloudy. Winds and waves higher in and near thunderstorms. $$