FZUS61 KBUF 012103 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 PM EST Sun Nov 1 2026 SLZ022-024-020400- Saint Lawrence River from Cape Vincent to Saint Regis 403 PM EST Sun Nov 1 2026 .TONIGHT...Southwest winds 5 to 10 knots. Partly cloudy early, then becoming mostly cloudy. .MONDAY...Southwest winds 5 to 10 knots. Mostly sunny. .MONDAY NIGHT...Southwest winds 10 knots or less becoming south. Mostly cloudy. .TUESDAY...South winds 10 knots or less. A chance of showers in the morning, then showers likely in the afternoon. .TUESDAY NIGHT...South winds 10 knots or less. Showers likely in the evening. .WEDNESDAY...South winds 5 to 15 knots. A chance of showers Wednesday night. .THURSDAY...South winds 10 knots or less becoming southwest. Showers likely. .FRIDAY...West winds 5 to 10 knots becoming north. Showers likely during the day, then a chance of showers Friday night. $$