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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt sun apr 26 2026


slz022-024-270900-
saint lawrence river from cape vincent to saint regis
1003 pm edt sun apr 26 2026

.overnight...light and variable winds. clear.
.monday...light and variable winds. sunny.
.monday night...light and variable winds becoming southeast 5 to
10 knots. mainly clear in the evening, then becoming partly
cloudy. 
.tuesday...south winds 10 to 15 knots. a chance of showers in the
afternoon. 
.tuesday night...south winds 5 to 15 knots becoming southwest. a
chance of showers. 
.wednesday...southwest winds 10 knots or less becoming west.
showers likely. 
.thursday...northwest winds 5 to 10 knots. rain showers likely
during the day, then a chance of rain showers thursday night. 
.friday...northwest winds 5 to 10 knots. a chance of rain
showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sun apr 26 2026

for waters beyond five nautical miles of shore on lake ontario

waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. occasional wave height is the average of
the highest 1/10 of the wave spectrum.

.synopsis...a 30.3 inch high will build across the lower great lakes 
through monday. a 29.4 inch low over the great plains monday night 
will advance northeast into the upper great lakes later monday night 
into tuesday morning, while pushing a warm front across the lake. 
the low will head northeast to james bay tuesday night sending a 
cold front across the lake. an inverted trough averaging 29.7 inch 
inverted trough is expected across the lower great lakes wednesday 
through wednesday night. the trough/low will track to the coast of 
new england through friday while also deepening to 29.5 inches.


loz063>065-270900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sun apr 26 2026

.overnight...light and variable winds. waves 1 foot or
less. 
.monday...light and variable winds becoming northeast 5 to
10 knots. waves 1 foot or less. 
.monday night...east winds 10 to 15 knots becoming southeast
15 to 20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.tuesday...southeast winds 15 to 20 knots becoming south. showers
likely. waves 3 to 5 feet. 
.tuesday night...south winds 15 to 20 knots becoming southwest
10 to 15 knots. showers likely in the evening, then a chance of
showers overnight. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.wednesday...southwest winds 5 to 15 knots becoming northwest
15 to 20 knots. showers likely. waves 1 to 3 feet. 
.thursday...northwest winds 15 to 20 knots. rain showers likely
during the day. waves 2 to 4 feet building to 3 to 5 feet. 
.friday...northwest winds 15 to 25 knots. a chance of rain
showers. waves 3 to 6 feet building to 4 to 7 feet, then
subsiding to 3 to 6 feet. waves occasionally around 9 feet. 

$$