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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
404 pm edt wed mar 25 2026


slz022-024-260300-
saint lawrence river from cape vincent to saint regis
404 pm edt wed mar 25 2026

.tonight...east winds less than 10 knots becoming south and
increasing to 15 to 20 knots after midnight. a chance of rain
showers, snow showers and freezing rain this evening, then rain
showers likely with a chance of freezing rain after midnight. 
.thursday...southwest winds 5 to 15 knots becoming west. a chance
of rain showers early. a chance of rain showers late. 
.thursday night...northwest winds 5 to 15 knots becoming north.
rain showers likely with a chance of snow showers in the evening,
then a chance of rain and snow showers overnight. 
.friday...north winds 5 to 15 knots. sunny.
.friday night...north winds 10 knots or less. partly to mostly
cloudy. 
.saturday...northwest winds 10 knots or less becoming southwest.
partly cloudy. 
.sunday...southwest winds 5 to 10 knots becoming south. partly
cloudy, then becoming mostly cloudy. 
.monday...southwest winds 5 to 10 knots becoming northwest. a
chance of rain and snow showers during the day. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt wed mar 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 29.7 inch low over the central great lakes tonight 
will pass north of the lake on thursday, then to the gulf of saint 
lawrence by early friday, with a trailing cold front crossing the 
lake thursday evening. a large 30.7 inch high will then build across 
the great lakes region friday through sunday.


loz063-064-260300-
lake ontario open waters from hamlin beach to mexico bay-
403 pm edt wed mar 25 2026

.tonight...east winds 10 to 15 knots becoming southwest 15 to
20 knots. a chance of rain showers late. waves 1 to 3 feet
building to 3 to 5 feet. 
.thursday...southwest winds 15 to 20 knots becoming northwest
10 to 15 knots. a chance of rain showers early in the afternoon.
rain showers likely late. waves 3 to 5 feet subsiding to 2 to
4 feet. 
.thursday night...north winds 10 to 15 knots increasing to 15 to
25 knots. rain showers in the evening, then rain showers with a
chance of snow showers overnight. waves 2 to 3 feet building to
3 to 5 feet. 
.friday...north winds 15 to 25 knots. a chance of snow showers in
the morning. waves 4 to 7 feet subsiding to 2 to 4 feet. waves
occasionally around 9 feet. 
.friday night...north winds 10 to 15 knots. waves 1 to 3 feet. 
.saturday...northwest winds 10 to 15 knots becoming west 15 to
20 knots. waves 1 to 2 feet building to 3 to 6 feet. 
.sunday...west winds 15 to 20 knots becoming south. waves 3 to
5 feet. 
.monday...southwest winds 15 to 20 knots becoming north. waves
3 to 6 feet. 

$$

fzus61 kbuf 252003
glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt wed mar 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 29.7 inch low over the central great lakes tonight 
will pass north of the lake on thursday, then to the gulf of saint 
lawrence by early friday, with a trailing cold front crossing the 
lake thursday evening. a large 30.7 inch high will then build across 
the great lakes region friday through sunday.


loz065-260300-
lake ontario open waters from mexico bay to the saint lawrence
river-
403 pm edt wed mar 25 2026

.tonight...east winds 10 to 15 knots becoming south 15 to
20 knots. a chance of rain showers early. a chance of rain
showers late. waves 1 foot or less building to 3 to 5 feet. 
.thursday...south winds 15 to 20 knots becoming southwest 10 to
15 knots. a chance of rain showers early in the afternoon. rain
showers likely late. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.thursday night...southeast winds around 10 knots becoming north
and increasing to 15 to 20 knots. rain showers in the evening,
then rain showers likely with a chance of snow showers overnight.
waves 1 to 3 feet building to 2 to 4 feet. 
.friday...north winds 15 to 25 knots. a chance of snow showers in
the morning. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.friday night...north winds 10 to 15 knots. waves 1 to 3 feet. 
.saturday...northwest winds 5 to 15 knots becoming west 15 to
20 knots. waves 1 foot or less building to 3 to 5 feet. 
.sunday...west winds 10 to 15 knots becoming south 15 to
20 knots. waves 3 to 5 feet. 
.monday...south winds 15 to 20 knots becoming north. waves 3 to
6 feet subsiding to 2 to 4 feet. 

$$