FZUS61 KBUF 200211 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1010 PM EDT Sun Apr 19 2026 SLZ022-024-200900- Saint Lawrence River from Cape Vincent to Saint Regis 1010 PM EDT Sun Apr 19 2026 .REST OF TONIGHT...West winds 5 to 15 knots becoming northwest. Partly cloudy late this evening, then becoming mostly cloudy. .MONDAY...Northwest winds 5 to 10 knots. Partly sunny early, then becoming mostly sunny. .MONDAY NIGHT...Northwest winds 10 knots or less becoming south. Mainly clear. .TUESDAY...Southwest winds 10 knots or less. Partly sunny in the morning, then becoming mostly cloudy. .TUESDAY NIGHT...South winds 10 knots or less becoming east. Mostly cloudy. .WEDNESDAY...Northeast winds less than 10 knots. Becoming mainly clear. .THURSDAY...Northwest winds less than 10 knots becoming northeast. Mostly cloudy. .FRIDAY...Northeast winds 10 knots or less becoming east. A chance of rain showers Friday night. $$