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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt tue apr 28 2026


slz022-024-290300-
saint lawrence river from cape vincent to saint regis
403 pm edt tue apr 28 2026

.tonight...south winds 5 to 15 knots becoming southwest. mostly
cloudy. 
.wednesday...southwest winds less than 10 knots. a chance of
showers early in the afternoon. rain late. 
.wednesday night...north winds 10 knots or less becoming
northwest. rain.
.thursday...west winds 5 to 10 knots. rain in the morning, then
showers likely in the afternoon. 
.thursday night...northwest winds 10 knots or less becoming west.
a chance of rain showers in the evening. 
.friday...west winds 5 to 10 knots. a chance of rain showers. 
.saturday...west winds 5 to 15 knots becoming southwest less than
10 knots. a chance of rain showers during the day. 
.sunday...southwest winds 5 to 15 knots. a chance of rain
showers. 

$$

fzus61 kbuf 282002
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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt tue apr 28 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 29.4 inch low over southern ontario this afternoon 
will continue to track across ontario this evening, while pushing a 
warm front across the lake. the low will then continue northeast to 
james bay tonight sending a cold front across the lake. an inverted 
trough averaging 29.7 inches is expected across the lower great 
lakes wednesday through wednesday night. the trough/low will track 
to the canadian maritimes, while also elongating south along the 
coast of new england thursday through friday. the remnants of the 
sfc low will then retrograde northwest to near james bay as a 29.5 
inch low tracks across the se u.s. and out to sea from the delmarva 
on saturday. a 29.8 inch surface high will ridge over the lake 
sunday.


loz062-290300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt tue apr 28 2026

.tonight...south winds 15 to 20 knots becoming northwest and
diminishing to less than 10 knots after midnight. a chance of
showers early. waves 1 to 3 feet subsiding to 1 foot or less. 
.wednesday...north winds 10 knots or less. rain in the afternoon.
waves 1 foot or less. 
.wednesday night...northwest winds 10 to 15 knots becoming west.
rain. waves 1 to 3 feet. 
.thursday...west winds 15 to 20 knots. waves 2 to 4 feet. 
.thursday night...west winds 10 to 15 knots. waves 2 to 3 feet. 
.friday...west winds 10 to 15 knots. waves 2 to 3 feet. 
.saturday...west winds 10 to 15 knots. waves 2 to 3 feet. 
.sunday...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 2 to 3 feet. 

$$

fzus61 kbuf 282002
glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt tue apr 28 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 29.4 inch low over southern ontario this afternoon 
will continue to track across ontario this evening, while pushing a 
warm front across the lake. the low will then continue northeast to 
james bay tonight sending a cold front across the lake. an inverted 
trough averaging 29.7 inches is expected across the lower great 
lakes wednesday through wednesday night. the trough/low will track 
to the canadian maritimes, while also elongating south along the 
coast of new england thursday through friday. the remnants of the 
sfc low will then retrograde northwest to near james bay as a 29.5 
inch low tracks across the se u.s. and out to sea from the delmarva 
on saturday. a 29.8 inch surface high will ridge over the lake 
sunday.


loz063>065-290300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt tue apr 28 2026

.tonight...south winds 15 to 25 knots becoming west and
diminishing to 5 to 15 knots. a chance of showers early. waves
3 to 5 feet subsiding to 2 feet or less. 
.wednesday...west winds 10 knots or less becoming north. rain in
the afternoon. waves 2 feet or less. 
.wednesday night...north winds 5 to 15 knots becoming west 15 to
20 knots. rain. waves 1 to 3 feet building to 2 to 4 feet. 
.thursday...west winds 15 to 20 knots. a chance of showers. waves
3 to 6 feet. 
.thursday night...west winds 15 to 20 knots diminishing to 10 to
15 knots. waves 3 to 6 feet subsiding to 2 to 4 feet. 
.friday...west winds 10 to 15 knots increasing to 15 to 20 knots.
waves 2 to 4 feet building to 3 to 5 feet, then 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. 
.sunday...west winds 15 to 20 knots becoming southwest 10 to
15 knots. waves 2 to 4 feet building to 3 to 5 feet, then
subsiding to 1 to 3 feet. 

$$