FZUS61 KBUF 290803 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 AM EDT Wed Apr 29 2026 SLZ022-024-291500- Saint Lawrence River from Cape Vincent to Saint Regis 403 AM EDT Wed Apr 29 2026 .TODAY...Southwest winds less than 10 knots becoming north. A chance of showers early this afternoon. Rain late. .TONIGHT...North winds 10 knots or less becoming west. Rain. .THURSDAY...West winds 5 to 10 knots. Rain showers likely in the morning, then a chance of rain showers in the afternoon. .THURSDAY NIGHT...West winds 10 knots or less. Partly to mostly cloudy. .FRIDAY...West winds 5 to 10 knots becoming southwest. A chance of rain showers. .SATURDAY...Southwest winds 10 knots or less. A chance of rain showers. .SUNDAY...Southwest winds 5 to 15 knots. A chance of rain showers. $$