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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
410 pm edt tue mar 24 2026


slz022-024-250300-
saint lawrence river from cape vincent to saint regis
410 pm edt tue mar 24 2026

.tonight...southwest winds 5 to 15 knots becoming west. mostly
cloudy. 
.wednesday...northwest winds less than 10 knots becoming east.
mostly cloudy in the morning, then becoming partly sunny. 
.wednesday night...east winds 10 knots or less becoming
southeast. a chance of rain showers, snow showers and freezing
rain in the evening, then rain showers and freezing rain likely
overnight. 
.thursday...south winds 5 to 15 knots becoming southwest. rain
showers. 
.thursday night...southwest winds 5 to 15 knots becoming
northwest. rain showers in the evening, then rain showers likely
overnight. 
.friday...northwest winds 5 to 15 knots becoming north less than
10 knots. mainly clear, then becoming partly cloudy. 
.saturday...west winds 5 to 15 knots. partly to mostly cloudy. 
.sunday...west winds 5 to 10 knots becoming southwest. partly to
mostly cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 pm edt tue mar 24 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 centered over the ohio valley will 
drift off the mid atlantic coast tonight. a weak 29.7 inch low over 
the central great lakes wednesday night will pass north of the lake 
on thursday, then to the gulf of saint lawrence by early friday, 
with a trailing cold front crossing the lake thursday evening. a 
large 30.7 inch high will then build across the great lakes region 
friday through sunday.


loz062-250300-
lake ontario open waters from the niagara river to hamlin beach-
409 pm edt tue mar 24 2026

.tonight...southwest winds 5 to 15 knots. waves 1 to 3 feet. 
.wednesday...south winds 10 knots or less becoming east. waves
1 foot or less. 
.wednesday night...east winds 10 to 15 knots becoming south. a
chance of rain showers overnight. waves 1 to 2 feet. 
.thursday...southwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers in the morning, then showers likely
in the afternoon. waves 1 to 3 feet. 
.thursday night...west winds 10 to 15 knots becoming northwest
15 to 20 knots. rain showers likely. waves 2 to 4 feet. 
.friday...north winds 15 to 20 knots becoming northwest 10 to
15 knots. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.saturday...west winds 15 to 20 knots. waves 2 to 4 feet building
to 3 to 6 feet. 
.sunday...west winds 15 to 20 knots becoming southwest. waves
3 to 5 feet. 

$$

fzus61 kbuf 242009
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open lake forecast for lake ontario
national weather service buffalo ny
409 pm edt tue mar 24 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 centered over the ohio valley will 
drift off the mid atlantic coast tonight. a weak 29.7 inch low over 
the central great lakes wednesday night will pass north of the lake 
on thursday, then to the gulf of saint lawrence by early friday, 
with a trailing cold front crossing the lake thursday evening. a 
large 30.7 inch high will then build across the great lakes region 
friday through sunday.


loz063-064-250300-
lake ontario open waters from hamlin beach to mexico bay-
409 pm edt tue mar 24 2026

.tonight...west winds 5 to 15 knots. waves 1 to 3 feet. 
.wednesday...west winds 10 knots or less becoming east. waves
2 feet or less. 
.wednesday night...east winds 5 to 15 knots becoming south. a
chance of rain showers overnight. waves 1 to 3 feet. 
.thursday...south winds 10 to 15 knots becoming southwest. a
chance of rain showers in the morning, then rain showers likely
in the afternoon. waves 1 to 3 feet. 
.thursday night...west winds 10 to 15 knots becoming northwest
15 to 20 knots. rain showers likely in the evening, then rain
showers likely with a chance of snow showers overnight. waves
2 to 4 feet building to 3 to 6 feet. 
.friday...north winds 15 to 20 knots. a chance of snow showers
during the day. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.saturday...west winds 15 to 25 knots. waves 2 to 4 feet building
to 5 to 8 feet. waves occasionally around 10 feet. 
.sunday...west winds 15 to 20 knots becoming southwest. waves
3 to 6 feet. 

$$

fzus61 kbuf 242009
glflo 
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open lake forecast for lake ontario
national weather service buffalo ny
409 pm edt tue mar 24 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 centered over the ohio valley will 
drift off the mid atlantic coast tonight. a weak 29.7 inch low over 
the central great lakes wednesday night will pass north of the lake 
on thursday, then to the gulf of saint lawrence by early friday, 
with a trailing cold front crossing the lake thursday evening. a 
large 30.7 inch high will then build across the great lakes region 
friday through sunday.


loz065-250300-
lake ontario open waters from mexico bay to the saint lawrence
river-
409 pm edt tue mar 24 2026

.tonight...west winds 5 to 15 knots. waves 1 to 3 feet. 
.wednesday...north winds 10 knots or less becoming east. waves
2 feet or less. 
.wednesday night...east winds 5 to 15 knots becoming south. a
chance of rain showers overnight. waves 1 to 3 feet. 
.thursday...south winds 10 to 15 knots becoming southwest. a
chance of rain showers in the morning, then rain showers likely
in the afternoon. waves 1 to 3 feet. 
.thursday night...southwest winds 10 to 15 knots becoming north
15 to 20 knots. rain showers likely in the evening, then rain
showers likely with a chance of snow showers overnight. waves
1 to 3 feet building to 3 to 5 feet. 
.friday...north winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of snow showers during the day. waves 3 to
5 feet subsiding to 2 feet or less. 
.saturday...northwest winds 10 to 15 knots becoming west and
increasing to 15 to 25 knots. waves 2 feet or less building to
4 to 7 feet. waves occasionally around 9 feet. 
.sunday...west winds 15 to 20 knots becoming south. waves 3 to
6 feet. 

$$