Great Lakes Forecast
Issued by NWS
Issued by NWS
669 FZUS61 KBUF 050803 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 AM EDT Fri Jun 5 2026 SLZ022-024-051500- Saint Lawrence River from Cape Vincent to Saint Regis 403 AM EDT Fri Jun 5 2026 .TODAY...Southwest winds 5 to 10 knots. Partly sunny through early afternoon, then becoming mostly cloudy. .TONIGHT...Southwest winds 10 knots or less becoming south. Showers likely after midnight. .SATURDAY...South winds 5 to 15 knots becoming southwest. Showers in the morning, then showers 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 10 knots or less becoming northeast. A chance of showers during the day. .MONDAY...Northeast winds less than 10 knots. Mainly clear. .TUESDAY...South winds less than 10 knots. Mainly clear. Winds and waves higher in and near thunderstorms. $$