FZUS61 KBUF 220804 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 404 AM EDT Sun Mar 22 2026 SLZ022-024-221500- Saint Lawrence River from Cape Vincent to Saint Regis 404 AM EDT Sun Mar 22 2026 .TODAY...East winds 5 to 15 knots becoming north. Snow showers with possible rain showers and sleet likely this morning, then a chance of snow and rain showers early this afternoon. .TONIGHT...Northeast winds 5 to 10 knots becoming north. Mostly cloudy. .MONDAY...North winds 5 to 10 knots becoming northwest. Mostly cloudy in the morning, then becoming partly sunny. .MONDAY NIGHT...Northwest winds 10 knots or less. Becoming mainly clear. .TUESDAY...West winds 10 knots or less becoming southwest. Partly cloudy, then becoming mostly cloudy. .WEDNESDAY...West winds 5 to 10 knots becoming northeast. A chance of snow and rain showers during the day, then a chance of snow showers Wednesday night. .THURSDAY...East winds 5 to 10 knots becoming northwest. Snow and rain showers likely. $$