


Great Lakes Forecast
Issued by NWS
Issued by NWS
717 FZUS61 KBUF 171403 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1002 AM EDT Sun Aug 17 2025 SLZ022-024-172100- Saint Lawrence River from Cape Vincent to Saint Regis 1002 AM EDT Sun Aug 17 2025 .THIS AFTERNOON...North winds 5 to 15 knots. Showers likely, then a chance of showers late. .TONIGHT...Northeast winds 10 to 15 knots. Becoming mainly clear. .MONDAY...Northeast winds 5 to 15 knots. Sunny. .MONDAY NIGHT...Northeast winds 10 knots or less becoming east. Partly cloudy in the evening, then becoming mostly cloudy. .TUESDAY...East winds 10 knots or less. A chance of showers during the day, then showers likely Tuesday night. .WEDNESDAY...East winds 5 to 10 knots becoming northeast. Showers likely during the day, then a chance of showers Wednesday night. .THURSDAY...Northeast winds 10 knots or less becoming northwest. Mainly clear. $$