


Great Lakes Forecast
Issued by NWS
Issued by NWS
644 FZUS61 KBUF 272002 GLFSL Forecast for the Saint Lawrence River including the Thousand Islands Region National Weather Service Buffalo NY 402 PM EDT Wed Aug 27 2025 SLZ022-024-280300- Saint Lawrence River from Cape Vincent to Saint Regis 402 PM EDT Wed Aug 27 2025 .TONIGHT...Southwest winds 10 knots or less becoming south. Partly cloudy through the early overnight, then becoming mostly cloudy. .THURSDAY...South winds 10 to 15 knots becoming southwest. A chance of showers in the morning, then showers likely early in the afternoon. Showers late. .THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming west less than 10 knots. Showers. .FRIDAY...West winds 10 knots or less. Showers likely. .FRIDAY NIGHT...West winds less than 10 knots. Showers likely in the evening, then a chance of showers overnight. .SATURDAY...West winds less than 10 knots. A chance of showers. .SUNDAY...Light and variable winds. Mainly clear. .MONDAY...Light and variable winds. Mainly clear. $$