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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt wed may 20 2026


slz022-024-201500-
saint lawrence river from cape vincent to saint regis
403 am edt wed may 20 2026

.today...west winds 5 to 15 knots. mostly cloudy early, then
becoming mostly sunny. 
.tonight...northwest winds 5 to 10 knots becoming north. mainly
clear early, then becoming partly cloudy. 
.thursday...north winds 10 knots or less. sunny.
.thursday night...north winds less than 10 knots. mainly clear in
the evening, then becoming partly cloudy. 
.friday...east winds less than 10 knots. partly cloudy, then
becoming mostly cloudy. 
.saturday...east winds 5 to 10 knots becoming southeast. a chance
of showers during the day, then showers likely saturday night. 
.sunday...southeast winds 5 to 10 knots becoming south. showers
likely. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt wed may 20 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...behind a passing cold front this morning, a large 30.4 
inch area of surface high pressure will build across the entire 
great lakes region through thursday, before sliding east off the new 
england coast late friday. this surface high will then strengthen to 
30.6 inches as it anchors over atlantic canada through sunday. a 
29.9 inch low and attendant warm front will then slowly approach the 
lake late friday night and saturday, before weakening and sliding 
eastward sunday. a 30.1 inch high will settle across the region 
monday.


loz063>065-201500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt wed may 20 2026

.today...west winds 15 to 20 knots. waves 3 to 6 feet. 
.tonight...west winds 15 to 20 knots becoming north. waves 3 to
6 feet subsiding to 1 to 3 feet. 
.thursday...northeast winds 15 to 20 knots becoming northwest
5 to 15 knots. waves 1 to 3 feet. 
.thursday night...west winds less than 10 knots. waves 1 foot or
less. 
.friday...east winds 5 to 15 knots increasing to 15 to 20 knots.
a chance of showers friday night. waves 1 to 3 feet. 
.saturday...southeast winds 15 to 25 knots. showers. waves 3 to
5 feet building to 4 to 7 feet, then subsiding to 3 to 6 feet.
waves occasionally around 9 feet. 
.sunday...southeast winds 15 to 25 knots. showers likely. waves
3 to 5 feet subsiding to 1 to 3 feet. 

$$