FZUS61 KBUF 310808 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 408 AM EDT Tue Mar 31 2026 SLZ022-024-311500- Saint Lawrence River from Cape Vincent to Saint Regis 408 AM EDT Tue Mar 31 2026 .TODAY...Northeast winds 5 to 15 knots. Rain showers with a chance of thunderstorms this morning, then a chance of rain showers early this afternoon. Rain showers likely late. .TONIGHT...Northeast winds 5 to 10 knots. Rain showers with a chance of thunderstorms in the evening, then rain showers likely after midnight. A chance of rain showers late. .WEDNESDAY...North winds 5 to 10 knots. Mostly cloudy. .WEDNESDAY NIGHT...Northeast winds 5 to 10 knots. Mostly cloudy. .THURSDAY...Northeast winds 5 to 15 knots becoming southeast 15 to 20 knots. Rain and snow showers with freezing rain likely during the day, then rain showers Thursday night. .FRIDAY...South winds 15 to 20 knots becoming northwest 5 to 15 knots. Rain showers during the day, then a chance of rain showers Friday night. .SATURDAY...Northeast winds 5 to 15 knots becoming south. A chance of rain showers during the day, then rain showers Saturday night. Winds and waves higher in and near thunderstorms. $$