603
FZUS61 KBUF 212003
GLFSL

Forecast for the Saint Lawrence River
including the Thousand Islands Region
National Weather Service Buffalo NY
403 PM EDT Fri Aug 21 2026

SLZ022-024-220300-
Saint Lawrence River from Cape Vincent to Saint Regis
403 PM EDT Fri Aug 21 2026

.TONIGHT...Northeast winds 10 knots or less becoming east. Mainly
clear.
.SATURDAY...Southeast winds 10 knots or less. Sunny.
.SATURDAY NIGHT...Southeast winds 10 knots or less increasing to
10 to 15 knots. A chance of showers and thunderstorms in the
evening, then showers likely with a chance of thunderstorms
overnight.
.SUNDAY...Southeast winds 5 to 15 knots becoming southwest.
Showers with a chance of thunderstorms.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Showers with a
chance of thunderstorms in the evening, then a chance of showers
overnight.
.MONDAY...Southwest winds 5 to 10 knots. Showers.
.TUESDAY...West winds 10 knots or less becoming southwest. Mostly
cloudy, then clearing.
.WEDNESDAY...Southwest winds 10 knots or less becoming south.
Partly to mostly cloudy.

Winds and waves higher in and near thunderstorms.

$$