Great Lakes Forecast
Issued by NWS
Issued by NWS
257 FZUS61 KBUF 242003 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 PM EDT Mon Aug 24 2026 SLZ022-024-250300- Saint Lawrence River from Cape Vincent to Saint Regis 403 PM EDT Mon Aug 24 2026 .TONIGHT...Southwest winds 5 to 15 knots becoming west less than 10 knots. Showers likely with a chance of thunderstorms early, then showers likely late this evening. A chance of showers after midnight. .TUESDAY...West winds less than 10 knots. A chance of showers in the afternoon. .TUESDAY NIGHT...West winds less than 10 knots. Partly to mostly cloudy. .WEDNESDAY...Light and variable winds becoming southwest 5 to 10 knots. Mostly sunny. .WEDNESDAY NIGHT...South winds 10 knots or less. Partly cloudy. .THURSDAY...South winds 5 to 15 knots becoming southwest less than 10 knots. Showers likely with a chance of thunderstorms. .FRIDAY...West winds 10 knots or less becoming northwest. A chance of showers during the day. .SATURDAY...Light and variable winds. Partly cloudy. Winds and waves higher in and near thunderstorms. $$