Great Lakes Forecast
Issued by NWS
Issued by NWS
976 FZUS61 KBUF 190803 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 AM EDT Sun Jul 19 2026 SLZ022-024-191500- Saint Lawrence River from Cape Vincent to Saint Regis 403 AM EDT Sun Jul 19 2026 .TODAY...Northwest winds 5 to 10 knots. Patchy smoke early. .TONIGHT...West winds 5 to 10 knots becoming light and variable. Mainly clear. .MONDAY...Light and variable winds becoming southwest 5 to 10 knots. Sunny. .MONDAY NIGHT...Southwest winds 10 knots or less becoming south 10 to 15 knots. Mostly cloudy. .TUESDAY...South winds 10 to 15 knots. Showers with a chance of thunderstorms. .WEDNESDAY...West winds 5 to 15 knots. Showers likely during the day, then a chance of showers Wednesday night. .THURSDAY...West winds 5 to 10 knots becoming light and variable. Mainly clear. Winds and waves higher in and near thunderstorms. $$