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


slz022-024-261500-
saint lawrence river from cape vincent to saint regis
402 am edt sun apr 26 2026

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 thursday while also deepening to 29.5 inches.


loz062-261500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt sun apr 26 2026

.today...northeast winds 5 to 10 knots becoming east. areas of
fog early. waves 2 feet or less. 
.tonight...northeast winds 10 knots or less becoming east. waves
1 foot or less. 
.monday...east winds 10 knots or less increasing to 10 to
15 knots. waves 2 feet or less. 
.monday night...east winds 15 to 20 knots becoming southeast
10 to 15 knots. waves 1 to 3 feet. 
.tuesday...southeast winds 5 to 15 knots becoming west. showers.
waves 1 to 3 feet. 
.wednesday...northwest winds 5 to 15 knots. showers likely. waves
1 to 2 feet. 
.thursday...northwest winds 10 to 15 knots. waves 1 to 3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 thursday while also deepening to 29.5 inches.


loz063>065-261500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sun apr 26 2026

.today...northeast winds 10 knots or less becoming northwest.
areas of fog early. waves 1 foot or less. 
.tonight...west winds less than 10 knots becoming northeast.
waves 1 foot or less. 
.monday...east winds 10 knots or less becoming northeast. waves
1 foot or less. 
.monday night...east winds 10 to 15 knots becoming southeast.
waves 1 to 3 feet. 
.tuesday...southeast winds 15 to 20 knots becoming south.
showers. waves 2 to 4 feet building to 3 to 5 feet, then
subsiding to 2 to 4 feet. 
.wednesday...southwest winds 5 to 15 knots becoming west. showers
likely. waves 1 to 3 feet. 
.thursday...west winds 10 to 15 knots becoming northwest 15 to
20 knots. a chance of showers during the day. waves 1 to 3 feet
building to 2 to 4 feet. 

$$