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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt sat sep 19 2026


slz022-024-192100-
saint lawrence river from cape vincent to saint regis
1003 am edt sat sep 19 2026

.this afternoon...northeast winds less than 10 knots. sunny.
.tonight...northeast winds less than 10 knots. mainly clear
early, then becoming mostly cloudy. 
.sunday...east winds 10 knots or less becoming northeast.
showers.
.sunday night...north winds 10 knots or less increasing to 10 to
15 knots. partly to mostly cloudy. 
.monday...north winds 5 to 15 knots becoming northeast. mostly
cloudy. 
.tuesday...northeast winds 5 to 10 knots. partly cloudy. 
.wednesday...northeast winds 10 knots or less becoming east.
partly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sat sep 19 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 ridge of high pressure averaging 30.4 inches 
over the lake will slowly drift to the east through tonight. during 
sunday night, a cold front will sweep southward across the lake. 
behind the front, a ridge averaging 30.4 inches should build from 
northern ontario through monday. by monday night through tuesday, a 
low of 30.0 inches should move from near the lower ohio valley 
toward the mid-atlantic states and extend a weak trough averaging 
30.3 inches over the eastern great lakes.


loz062-192100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt sat sep 19 2026

.this afternoon...east winds 10 to 15 knots increasing to 15 to
20 knots. waves 2 to 4 feet. 
.tonight...east winds 15 to 20 knots becoming southeast 5 to
15 knots. a chance of showers after midnight. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.sunday...east winds 10 to 15 knots becoming northeast. showers
likely. waves 1 to 3 feet. 
.sunday night...northeast winds 10 to 15 knots increasing to
15 to 25 knots. waves 1 to 3 feet building to 3 to 5 feet. 
.monday...northeast winds 15 to 25 knots. waves 3 to 6 feet
building to 4 to 7 feet. waves occasionally around 9 feet. 
.tuesday...east winds 20 to 25 knots. waves 5 to 8 feet. waves
occasionally around 10 feet. 
.wednesday...east winds 15 to 25 knots. a chance of showers.
waves 4 to 7 feet subsiding to 3 to 5 feet. waves occasionally
around 9 feet. 

$$

fzus61 kbuf 191402
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open lake forecast for lake ontario
national weather service buffalo ny
1002 am edt sat sep 19 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 ridge of high pressure averaging 30.4 inches 
over the lake will slowly drift to the east through tonight. during 
sunday night, a cold front will sweep southward across the lake. 
behind the front, a ridge averaging 30.4 inches should build from 
northern ontario through monday. by monday night through tuesday, a 
low of 30.0 inches should move from near the lower ohio valley 
toward the mid-atlantic states and extend a weak trough averaging 
30.3 inches over the eastern great lakes.


loz063>065-192100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt sat sep 19 2026

.this afternoon...east winds 5 to 10 knots becoming northeast.
waves 1 to 3 feet. 
.tonight...east winds 5 to 15 knots becoming southeast. a chance
of showers late. waves 2 feet or less. 
.sunday...southeast winds 10 to 15 knots becoming northeast 15 to
20 knots. showers. waves 1 to 3 feet building to 2 to 4 feet. 
.sunday night...northeast winds 15 to 20 knots. waves 2 to 4 feet
building to 3 to 6 feet. 
.monday...northeast winds 15 to 25 knots. waves 3 to 6 feet. 
.tuesday...east winds 15 to 25 knots. waves 3 to 6 feet. 
.wednesday...east winds 15 to 20 knots. a chance of showers
wednesday night. waves 3 to 5 feet subsiding to 2 to 4 feet. 

$$