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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1010 pm edt sun apr 19 2026


slz022-024-200900-
saint lawrence river from cape vincent to saint regis
1010 pm edt sun apr 19 2026

.rest of tonight...west winds 5 to 15 knots becoming northwest.
partly cloudy late this evening, then becoming mostly cloudy. 
.monday...northwest winds 5 to 10 knots. partly sunny early, then
becoming mostly sunny. 
.monday night...northwest winds 10 knots or less becoming south.
mainly clear. 
.tuesday...southwest winds 10 knots or less. partly sunny in the
morning, then becoming mostly cloudy. 
.tuesday night...south winds 10 knots or less becoming east.
mostly cloudy. 
.wednesday...northeast winds less than 10 knots. becoming mainly
clear. 
.thursday...northwest winds less than 10 knots becoming
northeast. mostly cloudy. 
.friday...northeast winds 10 knots or less becoming east. a
chance of rain showers friday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1009 pm 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...behind a passing cold 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.


loz062-200900-
lake ontario open waters from the niagara river to hamlin beach-
1009 pm edt sun apr 19 2026

.rest of tonight...northwest winds 15 to 20 knots. a chance of
snow and rain showers late this evening. a chance of snow showers
late. waves 2 to 4 feet. 
.monday...northwest winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 
.monday night...northwest winds 5 to 15 knots becoming south
10 knots or less. waves 1 to 3 feet subsiding to 1 foot or less. 
.tuesday...south winds 10 to 15 knots becoming southeast. waves
1 to 3 feet. 
.tuesday night...southeast winds 5 to 10 knots becoming
northeast. waves 2 feet or less. 
.wednesday...northeast winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.thursday...east winds 10 knots or less. waves 1 foot or less. 
.friday...east winds 10 to 15 knots increasing to 15 to 20 knots.
a chance of showers. waves 1 to 3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1009 pm 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...behind a passing cold 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>065-200900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1009 pm edt sun apr 19 2026

.rest of tonight...west winds 15 to 20 knots becoming northwest.
a chance of rain showers late this evening. a chance of snow
showers late. waves 2 to 4 feet building to 3 to 5 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 becoming southwest and
diminishing to 5 to 10 knots. waves 2 to 4 feet subsiding to
2 feet or less. 
.tuesday...southwest winds 5 to 15 knots becoming southeast.
waves 1 to 2 feet. 
.tuesday night...southeast winds 5 to 10 knots. waves 2 feet or
less. 
.wednesday...northeast winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.thursday...northwest winds 10 knots or less becoming east. waves
1 foot or less. 
.friday...northeast winds 5 to 15 knots becoming east. a chance
of showers friday night. waves 1 to 3 feet. 

$$