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


slz022-024-221500-
saint lawrence river from cape vincent to saint regis
404 am edt sun mar 22 2026

.today...east winds 5 to 15 knots becoming north. snow showers
with possible rain showers and sleet likely this morning, then a
chance of snow and rain showers early this afternoon. 
.tonight...northeast winds 5 to 10 knots becoming north. mostly
cloudy. 
.monday...north winds 5 to 10 knots becoming northwest. mostly
cloudy in the morning, then becoming partly sunny. 
.monday night...northwest winds 10 knots or less. becoming mainly
clear. 
.tuesday...west winds 10 knots or less becoming southwest. partly
cloudy, then becoming mostly cloudy. 
.wednesday...west winds 5 to 10 knots becoming northeast. a
chance of snow and rain showers during the day, then a chance of
snow showers wednesday night. 
.thursday...east winds 5 to 10 knots becoming northwest. snow and
rain showers likely. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am 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.


loz062-221500-
lake ontario open waters from the niagara river to hamlin beach-
403 am edt sun mar 22 2026

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am 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.


loz063-064-221500-
lake ontario open waters from hamlin beach to mexico bay-
403 am edt sun mar 22 2026

.today...south winds 15 to 20 knots becoming north 10 to
15 knots. a chance of rain showers early, then rain showers. a
chance of rain showers late. waves 2 to 4 feet subsiding to 1 to
3 feet. 
.tonight...northeast winds 15 to 20 knots. waves 1 to 3 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 5 to 15 knots becoming north.
waves 1 to 3 feet. 
.tuesday...northwest winds 5 to 15 knots becoming west. waves
1 to 3 feet. 
.wednesday...west winds 10 to 15 knots becoming east 15 to
20 knots. a chance of rain and snow showers wednesday night.
waves 1 to 3 feet building to 2 to 4 feet. 
.thursday...southeast winds 15 to 25 knots becoming northwest to
30 knots. rain showers likely with a chance of snow showers
during the day, then rain showers likely thursday night. waves
3 to 5 feet building to 7 to 10 feet. waves occasionally around
13 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am 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.


loz065-221500-
lake ontario open waters from mexico bay to the saint lawrence
river-
403 am edt sun mar 22 2026

.today...south winds 15 to 20 knots becoming north 5 to 15 knots.
rain showers likely through early afternoon. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.tonight...north winds 10 to 15 knots becoming northeast 15 to
20 knots. waves 1 to 3 feet. 
.monday...north winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 1 to 3 feet. 
.monday night...northwest winds 5 to 10 knots becoming north.
waves 2 feet or less. 
.tuesday...northwest winds 5 to 15 knots becoming southwest.
waves 1 to 3 feet. 
.wednesday...southwest winds 10 to 15 knots becoming east 15 to
20 knots. a chance of rain showers during the day, then a chance
of rain and snow showers wednesday night. waves 1 to 3 feet. 
.thursday...southeast winds 15 to 25 knots becoming northwest to
30 knots. rain and snow showers likely. waves 2 to 4 feet
building to 6 to 9 feet. waves occasionally around 11 feet. 

$$