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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1012 pm edt thu apr 9 2026


slz022-024-100900-
saint lawrence river from cape vincent to saint regis
1012 pm edt thu apr 9 2026

.overnight...southwest winds 5 to 15 knots becoming west
less than 10 knots. mostly cloudy. 
.friday...northwest winds 10 knots or less becoming north. a
chance of rain showers early, then rain showers from late morning
on. 
.friday night...northwest winds less than 10 knots. a chance of
rain showers. 
.saturday...northwest winds 5 to 10 knots. mostly sunny. 
.saturday night...west winds 5 to 10 knots becoming light and
variable. mainly clear. 
.sunday...south winds 10 knots or less becoming southwest and
increasing to 15 to 20 knots. a chance of rain showers during the
day, then rain showers sunday night. 
.monday...southwest winds 15 to 20 knots diminishing to 5 to
15 knots. showers.
.tuesday...southwest winds 5 to 10 knots becoming northeast.
showers likely. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1011 pm edt thu apr 9 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 29.5 inch low will move east of james bay tonight and 
across northern quebec, with a trailing cold front crossing the lake 
tonight through tomorrow. a 30.5 inch high is then forecast to build 
into the central great lakes region saturday, then drift east to new 
england by sunday. a cold front from a 29.4 inch low near james bay 
will cross the lake monday, and then stall south of the lake before 
slowly lifting northward later tuesday as a warm front.


loz063>065-100900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1011 pm edt thu apr 9 2026

.overnight...south winds 15 to 20 knots becoming west and
diminishing to 5 to 10 knots. waves 2 to 4 feet subsiding to 1 to
3 feet. 
.friday...north winds 5 to 10 knots becoming northwest. rain
showers likely early, then a chance of rain showers late in the
morning. rain showers in the afternoon. waves 1 to 2 feet. 
.friday night...northwest winds 5 to 15 knots. a chance of rain
showers. waves 1 to 3 feet. 
.saturday...northwest winds 10 to 15 knots becoming west. waves
1 to 3 feet. 
.saturday night...west winds 10 knots or less becoming southeast.
waves 2 feet or less. 
.sunday...southeast winds 5 to 15 knots becoming south and
increasing to 30 knots. a chance of rain showers. waves 2 feet or
less building to 5 to 8 feet. waves occasionally around 10 feet. 
.monday...southwest winds 15 to 25 knots. showers likely. waves
5 to 8 feet subsiding to 3 to 5 feet. waves occasionally around
10 feet. 
.tuesday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers during the day, then showers likely
tuesday night. waves 2 to 4 feet subsiding to 1 to 3 feet. 

$$