Great Lakes Forecast
Issued by NWS
Issued by NWS
249 FZUS61 KBUF 191403 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 1003 AM EDT Wed Aug 19 2026 SLZ022-024-192100- Saint Lawrence River from Cape Vincent to Saint Regis 1003 AM EDT Wed Aug 19 2026 .THIS AFTERNOON...Southwest winds 5 to 10 knots. Showers with a chance of thunderstorms. .TONIGHT...Southwest winds 10 knots or less becoming west. A chance of showers early. .THURSDAY...Light and variable winds becoming west 5 to 10 knots. Partly to mostly sunny. .THURSDAY NIGHT...West winds 5 to 10 knots becoming light and variable. Becoming mainly clear. .FRIDAY...Light and variable winds. Mainly clear, then becoming partly cloudy. .SATURDAY...Southeast winds 5 to 10 knots becoming south. Showers Saturday night. .SUNDAY...South winds 5 to 10 knots becoming southwest. Showers with a chance of thunderstorms. Winds and waves higher in and near thunderstorms. $$