FZUS61 KBUF 092003 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 PM EDT Tue Jun 9 2026 SLZ022-024-100300- Saint Lawrence River from Cape Vincent to Saint Regis 403 PM EDT Tue Jun 9 2026 .TONIGHT...Southwest winds less than 10 knots. A chance of showers and thunderstorms after midnight. .WEDNESDAY...South winds 5 to 10 knots. Showers in the morning, then showers with a chance of thunderstorms in the afternoon. .WEDNESDAY NIGHT...South winds 10 knots or less becoming southwest. Showers with a chance of thunderstorms in the evening, then showers likely overnight. .THURSDAY...Southwest winds 10 knots or less. A chance of showers in the morning, then a chance of showers and thunderstorms in the afternoon. .THURSDAY NIGHT...Southwest winds less than 10 knots. A chance of showers and thunderstorms in the evening. .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. .SUNDAY...Southwest winds 10 knots or less. A chance of showers. Winds and waves higher in and near thunderstorms. $$