Great Lakes Forecast
Issued by NWS
Issued by NWS
647 FZUS61 KBUF 072003 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 PM EDT Mon Sep 7 2026 SLZ022-024-080300- Saint Lawrence River from Cape Vincent to Saint Regis 403 PM EDT Mon Sep 7 2026 .TONIGHT...Southwest winds 10 knots or less. A chance of showers late. .TUESDAY...Light and variable winds. A chance of showers in the morning. .TUESDAY NIGHT...Northeast winds less than 10 knots. Mostly cloudy. .WEDNESDAY...South winds 5 to 15 knots. A chance of showers in the morning, then showers with a chance of thunderstorms in the afternoon. .WEDNESDAY NIGHT...Southwest winds 15 to 20 knots diminishing to 10 to 15 knots. Showers with a chance of thunderstorms in the evening, then showers overnight. .THURSDAY...Southwest winds 5 to 15 knots becoming northwest. Partly to mostly cloudy. .FRIDAY...Northwest winds less than 10 knots becoming south. Mainly clear. .SATURDAY...South winds 5 to 10 knots. Mainly clear, then becoming partly cloudy. Winds and waves higher in and near thunderstorms. $$