Great Lakes Forecast
Issued by NWS
Issued by NWS
626 FZUS61 KBUF 170803 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 403 AM EDT Mon Aug 17 2026 SLZ022-024-171500- Saint Lawrence River from Cape Vincent to Saint Regis 403 AM EDT Mon Aug 17 2026 .TODAY...Southwest winds 10 knots or less becoming northwest. A chance of showers early. A chance of showers early this afternoon. .TONIGHT...Northwest winds less than 10 knots. Patchy fog from late evening on. .TUESDAY...Light and variable winds becoming west 5 to 10 knots. Patchy fog in the morning. .TUESDAY NIGHT...Southwest winds 10 knots or less becoming south. A chance of showers overnight. .WEDNESDAY...Southwest winds 10 knots or less becoming west. Showers with a chance of thunderstorms during the day, then showers Wednesday night. .THURSDAY...Light and variable winds. Becoming mainly clear. .FRIDAY...Light and variable winds. Mainly clear. Winds and waves higher in and near thunderstorms. $$