


Great Lakes Forecast
Issued by NWS
Issued by NWS
734 FZUS61 KBUF 231402 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1002 AM EDT Sat Aug 23 2025 SLZ022-024-232100- Saint Lawrence River from Cape Vincent to Saint Regis 1002 AM EDT Sat Aug 23 2025 .THIS AFTERNOON...Southwest winds 5 to 15 knots. Partly sunny, then becoming mostly cloudy. .TONIGHT...Southwest winds 5 to 15 knots becoming south. A chance of showers and thunderstorms early, then showers likely with a chance of thunderstorms late in the evening. Showers likely after midnight. .SUNDAY...South winds 10 to 15 knots becoming southwest. Showers in the morning, then showers with a chance of thunderstorms in the afternoon. .SUNDAY NIGHT...Southwest winds 10 knots or less. Showers with a chance of thunderstorms in the evening, then a chance of showers overnight. .MONDAY...Southwest winds 5 to 15 knots becoming west. Showers likely. .TUESDAY...West winds 10 knots or less. A chance of showers. .WEDNESDAY...West winds 10 knots or less becoming southwest. Partly cloudy. Winds and waves higher in and near thunderstorms. $$