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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
404 pm edt sun mar 22 2026


slz022-024-230300-
saint lawrence river from cape vincent to saint regis
404 pm edt sun mar 22 2026

.tonight...northeast winds 5 to 10 knots becoming north. cloudy.
.monday...north winds 5 to 10 knots becoming northwest. mostly
cloudy. 
.monday night...northwest winds 10 knots or less. partly cloudy
in the evening, then becoming mainly clear. 
.tuesday...west winds 10 knots or less becoming southwest 10 to
15 knots. sunny in the morning, then becoming partly sunny. 
.tuesday night...southwest winds 5 to 10 knots. a chance of snow
showers overnight. 
.wednesday...southwest winds 5 to 10 knots becoming northeast. a
chance of rain and snow showers. 
.thursday...northeast winds 5 to 10 knots becoming northwest.
rain and snow showers likely. 
.friday...northwest winds 5 to 10 knots. 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 sun mar 22 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 wavy cold frontal boundary averaging 29.6 inches will 
cross the lower great lakes today, before sliding off the mid-
atlantic coast tonight. a 30.4 inch high will then build across 
lower michigan monday, and the mid-atlantic states tuesday. a 29.8 
inch low tracking across quebec will then push its associated cold 
front across the lake on wednesday, with another 29.6 inch low then 
developing across the central great lakes and or the ohio valley 
thursday.


loz063-064-230300-
lake ontario open waters from hamlin beach to mexico bay-
403 pm edt sun mar 22 2026

.tonight...north winds 15 to 20 knots becoming northeast. waves
2 to 4 feet building to 3 to 5 feet. 
.monday...north winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.monday night...northwest winds 15 to 20 knots diminishing to
10 to 15 knots. waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.tuesday...northwest winds 5 to 15 knots becoming west. waves
2 feet or less. 
.tuesday night...west winds 5 to 15 knots becoming southwest.
waves 1 to 2 feet. 
.wednesday...southwest winds 10 to 15 knots becoming east. a
chance of rain and snow showers wednesday night. waves 1 to
3 feet. 
.thursday...east winds 15 to 25 knots becoming northwest. a
chance of rain and snow showers during the day, then rain showers
likely with a chance of snow showers thursday night. waves 2 to
4 feet building to 5 to 8 feet. waves occasionally around
10 feet. 
.friday...north winds 15 to 25 knots becoming northwest. a chance
of rain and snow showers during the day. waves 5 to 8 feet
subsiding to 3 to 6 feet. waves occasionally around 10 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 pm edt sun mar 22 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 wavy cold frontal boundary averaging 29.6 inches will 
cross the lower great lakes today, before sliding off the mid-
atlantic coast tonight. a 30.4 inch high will then build across 
lower michigan monday, and the mid-atlantic states tuesday. a 29.8 
inch low tracking across quebec will then push its associated cold 
front across the lake on wednesday, with another 29.6 inch low then 
developing across the central great lakes and or the ohio valley 
thursday.


loz065-230300-
lake ontario open waters from mexico bay to the saint lawrence
river-
403 pm edt sun mar 22 2026

.tonight...north winds 15 to 20 knots becoming northeast. waves
1 to 3 feet building to 2 to 4 feet. 
.monday...north winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.monday night...northwest winds 10 to 15 knots becoming north.
waves 2 feet or less. 
.tuesday...northwest winds 10 knots or less becoming southwest
10 to 15 knots. waves 2 feet or less. 
.tuesday night...southwest winds 5 to 10 knots. waves 2 feet or
less. 
.wednesday...south winds 10 to 15 knots becoming northeast. a
chance of rain and snow showers wednesday night. waves 1 to
3 feet. 
.thursday...east winds 10 to 15 knots becoming northwest and
increasing to 15 to 25 knots. a chance of rain and snow showers
during the day, then rain and snow showers likely thursday night.
waves 1 to 3 feet building to 4 to 7 feet. waves occasionally
around 9 feet. 
.friday...north winds 15 to 25 knots. a chance of rain and snow
showers during the day. waves 3 to 6 feet subsiding to 1 to
3 feet. 

$$