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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt mon apr 27 2026


slz022-024-280300-
saint lawrence river from cape vincent to saint regis
403 pm edt mon apr 27 2026

.tonight...east winds 10 knots or less becoming south. mainly
clear this evening, then becoming partly cloudy. 
.tuesday...south winds 10 to 15 knots. a chance of showers in the
afternoon. 
.tuesday night...south winds 5 to 15 knots becoming southwest. a
chance of showers. 
.wednesday...southwest winds less than 10 knots becoming east.
showers likely in the afternoon. 
.wednesday night...northeast winds 10 knots or less becoming
southwest. showers.
.thursday...southwest winds 5 to 10 knots becoming west. rain
showers during the day, then a chance of rain showers thursday
night. 
.friday...west winds 5 to 15 knots diminishing to less than
10 knots. a chance of rain showers. 
.saturday...west winds 10 knots or less. a chance of rain and
snow showers during the day, then a chance of rain showers
saturday night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon apr 27 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 30.3 inch high will ridge along the eastern seaboard 
through tonight. a 29.4 inch low over the great plains will advance 
northeast into the upper great lakes later tonight into tuesday 
morning, while pushing a warm front across the lake. the low will 
head northeast to james bay tuesday night sending a cold front 
across the lake. an inverted trough averaging 29.7 inch inverted 
trough is expected across the lower great lakes wednesday through 
wednesday night. the trough/low will track to the coast of new 
england through friday while also deepening to 29.5 inches.


loz062-280300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt mon apr 27 2026

.tonight...east winds 15 to 20 knots becoming southeast 10 to
15 knots. waves 2 to 4 feet. 
.tuesday...southeast winds 15 to 20 knots becoming south. showers
through early afternoon. waves 2 to 4 feet subsiding to 1 to
3 feet. 
.tuesday night...south winds 15 to 20 knots becoming northwest
5 to 15 knots. waves 1 to 3 feet. 
.wednesday...north winds 10 knots or less. a chance of showers in
the morning, then showers in the afternoon. waves 1 foot or less.
.wednesday night...north winds 10 to 15 knots becoming northwest.
showers. waves 1 to 3 feet building to 2 to 4 feet. 
.thursday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. a chance of rain showers during the day. waves 2 to
4 feet. 
.friday...west winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 1 to 3 feet. 
.saturday...west winds 10 to 15 knots. waves 2 to 3 feet. 

$$

fzus61 kbuf 272002
glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon apr 27 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 30.3 inch high will ridge along the eastern seaboard 
through tonight. a 29.4 inch low over the great plains will advance 
northeast into the upper great lakes later tonight into tuesday 
morning, while pushing a warm front across the lake. the low will 
head northeast to james bay tuesday night sending a cold front 
across the lake. an inverted trough averaging 29.7 inch inverted 
trough is expected across the lower great lakes wednesday through 
wednesday night. the trough/low will track to the coast of new 
england through friday while also deepening to 29.5 inches.


loz063>065-280300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt mon apr 27 2026

.tonight...east winds 10 to 15 knots becoming southeast 15 to
20 knots. waves 1 to 3 feet building to 2 to 4 feet. 
.tuesday...southeast winds 15 to 20 knots. showers likely from
late morning on. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.tuesday night...south winds 15 to 25 knots becoming west and
diminishing to 10 to 15 knots. waves 3 to 5 feet subsiding to
1 to 3 feet. 
.wednesday...west winds 5 to 10 knots becoming northeast. a
chance of showers in the morning, then showers in the afternoon.
waves 2 feet or less. 
.wednesday night...northeast winds 5 to 15 knots becoming west
15 to 20 knots. showers. waves 1 to 3 feet building to 2 to
4 feet. 
.thursday...west winds 15 to 25 knots becoming northwest. rain
showers likely during the day. waves 3 to 6 feet. 
.friday...west winds 15 to 25 knots. waves 3 to 6 feet subsiding
to 2 to 4 feet. 
.saturday...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 

$$