FZUS61 KBUF 052002 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 402 PM EDT Fri Jun 5 2026 SLZ022-024-060300- Saint Lawrence River from Cape Vincent to Saint Regis 402 PM EDT Fri Jun 5 2026 .TONIGHT...Southwest winds 10 knots or less. A chance of showers late. .SATURDAY...South winds 5 to 15 knots becoming southwest. Showers in the morning, then showers likely with a chance of thunderstorms in the afternoon. .SATURDAY NIGHT...Southwest winds 10 knots or less becoming west. Showers with a chance of thunderstorms in the evening, then showers likely overnight. .SUNDAY...Northwest winds 5 to 10 knots becoming north. A chance of showers. .SUNDAY NIGHT...Northeast winds less than 10 knots. A chance of showers in the evening. .MONDAY...Northeast winds less than 10 knots. Mainly clear. .TUESDAY...Light and variable winds. Mainly clear. .WEDNESDAY...South winds less than 10 knots. A chance of showers. Winds and waves higher in and near thunderstorms. $$