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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
405 am edt sun apr 19 2026


slz022-024-191500-
saint lawrence river from cape vincent to saint regis
405 am edt sun apr 19 2026

.today...west winds 5 to 15 knots. rain and snow showers likely
early, then a chance of rain and snow showers late this morning.
a chance of rain showers this afternoon. 
.tonight...west winds 5 to 15 knots becoming northwest. partly to
mostly cloudy. 
.monday...northwest winds 5 to 10 knots. partly sunny. 
.monday night...west winds less than 10 knots becoming south.
becoming mainly clear. 
.tuesday...southwest winds 5 to 10 knots becoming southeast.
mostly cloudy. 
.wednesday...north winds less than 10 knots becoming west. partly
to mostly cloudy. 
.thursday...west winds less than 10 knots becoming northeast.
partly to mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
404 am edt sun apr 19 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 30.4 inch high will then settle southeast across the 
great lakes 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. a warm front will then approach the lake by friday.


loz063>065-191500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
404 am edt sun apr 19 2026

.today...west winds 10 to 15 knots increasing to 15 to 20 knots.
rain and snow showers likely early, then a chance of rain showers
late this morning. waves 2 to 4 feet building to 3 to 5 feet. 
.tonight...west winds 15 to 20 knots becoming northwest. a chance
of rain showers early, then a chance of rain and snow showers
late in the evening. waves 3 to 6 feet. 
.monday...northwest winds 15 to 20 knots becoming west. waves
3 to 5 feet subsiding to 2 to 4 feet. 
.monday night...west winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.tuesday...south winds 5 to 15 knots becoming southeast. waves
1 to 2 feet. 
.wednesday...northeast winds 10 knots or less becoming northwest.
waves 1 to 3 feet subsiding to 1 foot or less. 
.thursday...northwest winds 10 knots or less becoming east. waves
1 foot or less. 

$$