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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1237 pm edt thu apr 16 2026


slz022-024-162100-
saint lawrence river from cape vincent to saint regis
1237 pm edt thu apr 16 2026

.this afternoon...south winds 5 to 10 knots becoming southwest.
showers with a chance of thunderstorms. 
.tonight...southwest winds 10 knots or less becoming north.
showers with a chance of thunderstorms early, then showers likely
late in the evening. a chance of showers after midnight. 
.friday...north winds less than 10 knots becoming northeast.
mostly cloudy in the morning, then becoming partly sunny. 
.friday night...northeast winds less than 10 knots. mainly clear
in the evening, then becoming partly cloudy. 
.saturday...southeast winds 10 to 15 knots becoming southwest. a
chance of showers during the day, then showers saturday night. 
.sunday...west winds 5 to 15 knots becoming northwest. rain
showers likely during the day, then a chance of rain showers
sunday night. 
.monday...northwest winds 10 knots or less becoming southwest.
partly cloudy. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1236 pm edt thu apr 16 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 29.6 inch low will move across the central great lakes 
today before reaching southern quebec tonight, then drift off the 
new england coast by friday night. a 30.0 inch high is then forecast 
to build from the central great lakes friday to the lower great 
lakes saturday morning, then off the east coast saturday night. a 
29.3 inch surface low to the north of lake superior saturday will 
deepen to 28.9 inches by sunday, with a trailing cold front crossing 
the lake saturday night. a 30.4 inch surface high will push from the 
plains to the upper ohio valley from sunday through monday. the high 
is expected to move off the mid-atlantic coast tuesday.


loz063>065-162100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1236 pm edt thu apr 16 2026

.this afternoon...southwest winds 10 to 15 knots. showers with a
chance of thunderstorms. some thunderstorms may produce gusty
winds. waves 1 to 3 feet. 
.tonight...southwest winds 5 to 15 knots becoming northwest.
showers with a chance of thunderstorms early, then a chance of
showers from late evening on. some thunderstorms may produce
gusty winds early. waves 1 to 3 feet. 
.friday...north winds 10 knots or less becoming west. a chance of
showers in the morning. waves 2 feet or less. 
.friday night...west winds 10 knots or less becoming southeast.
waves 1 foot or less. 
.saturday...southeast winds 15 to 20 knots becoming west. rain
showers. waves 1 to 3 feet building to 3 to 5 feet. 
.sunday...west winds 15 to 25 knots becoming northwest. rain
showers likely during the day, then a chance of rain showers
sunday night. waves 3 to 6 feet building to 5 to 9 feet. waves
occasionally around 11 feet. 
.monday...northwest winds 15 to 20 knots becoming west 10 to
15 knots. waves 5 to 9 feet subsiding to 3 to 5 feet. waves
occasionally around 11 feet. 

winds and waves higher in and near thunderstorms.

$$