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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1010 am edt thu apr 23 2026


slz022-024-232100-
saint lawrence river from cape vincent to saint regis
1010 am edt thu apr 23 2026

.this afternoon...north winds 5 to 15 knots becoming northwest.
sunny.
.tonight...north winds 5 to 10 knots. partly cloudy. 
.friday...north winds 10 knots or less. sunny.
.friday night...northeast winds 10 knots or less becoming east.
mainly clear. 
.saturday...east winds 5 to 10 knots becoming light and variable.
a chance of rain showers. 
.sunday...northeast winds less than 10 knots. partly cloudy. 
.monday...light and variable winds becoming southeast 5 to
10 knots. partly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1009 am edt thu apr 23 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 30.1 inch high centered across the eastern great lakes 
this morning will slide east into the atlantic through tonight. a 
warm front will approach the lake friday, this from a 29.6 inch area 
of low pressure that will advance across the great lakes region, 
though remaining south of the lake. this low will move towards 
delmarva saturday. a 30.2 inch area of high pressure will build 
across the lower great lakes saturday night and sunday. a 29.4 inch 
area of low pressure will advance from the central plains sunday 
night to the western great lakes monday night.


loz062-232100-
lake ontario open waters from the niagara river to hamlin beach-
1009 am edt thu apr 23 2026

.this afternoon...southeast winds 10 knots or less becoming
northeast. waves 1 foot or less. 
.tonight...northeast winds 5 to 15 knots becoming east. waves
2 feet or less. 
.friday...east winds 15 to 20 knots. waves 1 to 3 feet building
to 2 to 4 feet. 
.friday night...east winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers in the evening, then showers likely
overnight. waves 1 to 3 feet building to 3 to 5 feet. 
.saturday...east winds 15 to 20 knots becoming northeast 5 to
15 knots. rain showers likely during the day, then a chance of
rain showers saturday night. waves 3 to 6 feet subsiding to 1 to
3 feet. 
.sunday...northeast winds 10 knots or less becoming east. waves
2 feet or less. 
.monday...east winds 5 to 10 knots becoming southeast and
increasing to 15 to 20 knots. a chance of showers monday night.
waves 1 foot or less building to 2 to 4 feet. 

$$

fzus61 kbuf 231409
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open lake forecast for lake ontario
national weather service buffalo ny
1009 am edt thu apr 23 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 30.1 inch high centered across the eastern great lakes 
this morning will slide east into the atlantic through tonight. a 
warm front will approach the lake friday, this from a 29.6 inch area 
of low pressure that will advance across the great lakes region, 
though remaining south of the lake. this low will move towards 
delmarva saturday. a 30.2 inch area of high pressure will build 
across the lower great lakes saturday night and sunday. a 29.4 inch 
area of low pressure will advance from the central plains sunday 
night to the western great lakes monday night.


loz063>065-232100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1009 am edt thu apr 23 2026

.this afternoon...west winds 5 to 15 knots. waves 1 foot or less. 
.tonight...southwest winds 5 to 10 knots becoming northeast.
waves 2 feet or less. 
.friday...northeast winds 5 to 10 knots. waves 2 feet or less. 
.friday night...northeast winds 5 to 15 knots becoming east 15 to
20 knots. a chance of showers overnight. waves 1 to 3 feet. 
.saturday...east winds 15 to 20 knots becoming northeast 5 to
15 knots. showers likely during the day, then a chance of showers
saturday night. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.sunday...north winds 5 to 10 knots becoming light and variable.
waves 1 foot or less. 
.monday...east winds 10 knots or less becoming southeast and
increasing to 15 to 20 knots. a chance of showers monday night.
waves 1 to 3 feet building to 2 to 4 feet. 

$$