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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1011 am edt sun apr 19 2026


slz022-024-192100-
saint lawrence river from cape vincent to saint regis
1011 am edt sun apr 19 2026

.rest of today...west winds 5 to 15 knots. a chance of rain and
snow showers late this morning, then a chance of rain showers
early 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
1010 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...elongated low pressure draped from eastern canada to the 
southern new england coastline and averaging 29.7 inches will slide 
further eastward this afternoon...with a trailing secondary cold 
front crossing the lake this evening. behind this front, a 30.4 inch 
high will 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.


loz062-192100-
lake ontario open waters from the niagara river to hamlin beach-
1010 am edt sun apr 19 2026

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

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1010 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...elongated low pressure draped from eastern canada to the 
southern new england coastline and averaging 29.7 inches will slide 
further eastward this afternoon...with a trailing secondary cold 
front crossing the lake this evening. behind this front, a 30.4 inch 
high will 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>065-192100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1010 am edt sun apr 19 2026

.this afternoon...west winds 10 to 15 knots increasing to 15 to
20 knots. waves 1 to 3 feet building to 3 to 5 feet. 
.tonight...west winds 15 to 20 knots becoming northwest. a chance
of rain and snow showers 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. 

$$