FZUS61 KBUF 270802 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 402 AM EDT Mon Oct 27 2025 SLZ022-024-271500- Saint Lawrence River from Cape Vincent to Saint Regis 402 AM EDT Mon Oct 27 2025 .TODAY...North winds 10 knots or less becoming northeast. Mostly sunny. .TONIGHT...Northeast winds 10 knots or less. Partly cloudy. .TUESDAY...Northeast winds 10 knots or less. Sunny. .TUESDAY NIGHT...Northeast winds 10 knots or less. Mainly clear. .WEDNESDAY...Northeast winds 10 knots or less. A chance of rain showers Wednesday night. .THURSDAY...Northeast winds 5 to 10 knots. Rain showers. .FRIDAY...Southeast winds 5 to 15 knots becoming west. Showers. $$