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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
404 pm edt fri apr 17 2026


slz022-024-180300-
saint lawrence river from cape vincent to saint regis
404 pm edt fri apr 17 2026

.tonight...northeast winds less than 10 knots. mainly clear. 
.saturday...southeast winds 5 to 10 knots becoming south and
increasing to 15 to 20 knots. a chance of showers late. 
.saturday night...south winds 15 to 20 knots becoming west 10 to
15 knots. rain showers. 
.sunday...west winds 10 to 15 knots. rain showers in the morning,
then a chance of rain showers in the afternoon. 
.sunday night...west winds 5 to 15 knots becoming northwest.
partly cloudy. 
.monday...northwest winds 10 knots or less becoming southwest.
partly cloudy, then becoming mainly clear. 
.tuesday...south winds 5 to 10 knots becoming west. a chance of
rain showers. 
.wednesday...northwest winds 10 knots or less. partly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
404 pm edt fri apr 17 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 30.0 inch high over the lake this evening will slide 
east into new england tonight. meanwhile, a 29.4 inch low near lake 
superior this evening will move to james bay and deepen to 29.0 
inches saturday, while pushing a trailing strong cold front across 
the lake later saturday and saturday evening. a 30.4 inch high will 
then settle southeastward across the great lakes sunday through 
monday night, before sliding off the mid-atlantic coast tuesday. a 
29.4 inch low over lower hudson bay tuesday, will weaken to 29.9 
inches by wednesday, while pushing an attendant weak cold front 
across the lake tuesday night. a 30.2 inch high will then build 
across the great lakes region wednesday and thursday.


loz063>065-180300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
404 pm edt fri apr 17 2026

.tonight...west winds 10 knots or less becoming southeast 10 to
15 knots. patchy fog. waves 2 feet or less. 
.saturday...southeast winds 15 to 25 knots becoming south. patchy
fog early. a chance of showers early in the afternoon. showers
late. waves 1 to 3 feet building to 3 to 5 feet. 
.saturday night...southwest winds 15 to 25 knots becoming west.
rain showers. waves 3 to 5 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
rain showers in the morning, then a chance of rain showers in the
afternoon. waves 2 to 4 feet building to 3 to 6 feet. 
.sunday night...west winds 15 to 20 knots becoming northwest.
waves 4 to 7 feet subsiding to 3 to 6 feet. waves occasionally
around 9 feet. 
.monday...northwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 3 to 5 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 15 to 20 knots becoming west 10 to
15 knots. a chance of rain showers. waves 1 to 3 feet. 
.wednesday...northwest winds 5 to 15 knots becoming north. waves
1 to 3 feet subsiding to 1 foot or less. 

$$