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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt sat apr 25 2026


slz022-024-260900-
saint lawrence river from cape vincent to saint regis
1003 pm edt sat apr 25 2026

.overnight...north winds less than 10 knots. partly to
mostly cloudy. 
.sunday...light and variable winds. sunny.
.sunday night...northeast winds less than 10 knots. clear.
.monday...light and variable winds. sunny.
.monday night...northeast winds 10 knots or less becoming
southeast. mainly clear in the evening, then becoming partly
cloudy. 
.tuesday...southeast winds 10 to 15 knots becoming south 15 to
20 knots. a chance of showers. 
.wednesday...south winds 10 knots or less becoming southwest.
showers likely. 
.thursday...west winds 10 knots or less. a chance of rain
showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sat apr 25 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.


loz062-260900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt sat apr 25 2026

.rest of tonight...east winds 10 to 15 knots becoming northeast.
waves 2 to 4 feet subsiding to 1 to 3 feet. 
.sunday...northeast winds 5 to 10 knots becoming east. waves
2 feet or less. 
.sunday night...east winds 10 knots or less. 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 15 to 20 knots becoming southwest and
diminishing to 5 to 10 knots. showers. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.wednesday...west winds 5 to 15 knots. a chance of showers. waves
2 feet or less building to 2 to 3 feet. 
.thursday...west winds 10 to 15 knots becoming northwest. waves
1 to 3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt sat apr 25 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.


loz063>065-260900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt sat apr 25 2026

.rest of tonight...southeast winds 5 to 10 knots becoming east. a
chance of rain showers late this evening. waves 1 to 3 feet. 
.sunday...northeast winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.sunday night...northwest winds less than 10 knots. waves 1 foot
or less. 
.monday...southeast winds 10 knots or less becoming northeast.
waves 1 foot or less. 
.monday night...east winds 5 to 15 knots becoming southeast 15 to
20 knots. 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...south winds 10 to 15 knots becoming west. showers
likely. waves 1 to 3 feet. 
.thursday...west winds 15 to 20 knots becoming northwest. waves
2 to 4 feet. 

$$