FZUS61 KBUF 012003 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 PM EDT Mon Jun 1 2026 SLZ022-024-020300- Saint Lawrence River from Cape Vincent to Saint Regis 403 PM EDT Mon Jun 1 2026 .TONIGHT...Northeast winds 5 to 10 knots becoming light and variable. Mainly clear. .TUESDAY...Light and variable winds becoming north 5 to 10 knots. Mostly sunny. .TUESDAY NIGHT...Northwest winds less than 10 knots. Becoming mainly clear. .WEDNESDAY...Light and variable winds becoming west 5 to 10 knots. Sunny. .WEDNESDAY NIGHT...Southwest winds 10 knots or less. Mainly clear. .THURSDAY...Southwest winds 10 knots or less. Mainly clear, then becoming mostly cloudy. .FRIDAY...Southwest winds 10 knots or less. A chance of showers Friday night. .SATURDAY...Southwest winds 10 knots or less becoming northeast. A chance of showers. $$