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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
410 pm edt mon mar 30 2026


slz022-024-310300-
saint lawrence river from cape vincent to saint regis
410 pm edt mon mar 30 2026

.tonight...west winds 10 knots or less becoming northeast. a
chance of rain showers late. 
.tuesday...northeast winds 5 to 15 knots. rain showers in the
morning, then a chance of rain showers early in the afternoon.
rain showers likely late. 
.tuesday night...northeast winds 5 to 10 knots becoming north.
rain showers. 
.wednesday...north winds 5 to 10 knots. rain showers likely in
the morning. 
.wednesday night...north winds 5 to 10 knots becoming northeast.
mostly cloudy. 
.thursday...northeast winds 5 to 15 knots becoming southeast.
snow and rain showers during the day, then rain and snow showers
thursday night. 
.friday...south winds 15 to 20 knots becoming northwest 5 to
15 knots. rain showers during the day, then a chance of rain
showers friday night. 
.saturday...north winds 5 to 15 knots becoming south. a chance of
rain showers during the day, then rain showers likely saturday
night. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 pm edt mon mar 30 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 frontal zone will stall near the lake through tuesday. 
a 29.6 inch low will move across southern ontario province tuesday 
evening before reaching the canadian maritimes wednesday, with a 
trailing cold front moving south across the lake. a 30.6 inch high 
will then build east across ontario and quebec wednesday through 
thursday. a 29.6 inch low is then forecast to move into the central 
great lakes thursday night before reaching southern quebec late 
friday.


loz062-310300-
lake ontario open waters from the niagara river to hamlin beach-
409 pm edt mon mar 30 2026

.tonight...southwest winds 5 to 15 knots becoming east. a chance
of showers and thunderstorms late this evening. showers with a
chance of thunderstorms after midnight. waves 1 to 2 feet. 
.tuesday...east winds 15 to 20 knots. showers with a chance of
thunderstorms. waves 1 to 3 feet building to 3 to 5 feet. 
.tuesday night...east winds 15 to 20 knots becoming northwest.
showers. waves 3 to 5 feet. 
.wednesday...northwest winds 5 to 15 knots becoming north. rain
showers likely in the morning, then a chance of rain showers in
the afternoon. waves 2 to 4 feet subsiding to 1 to 2 feet. 
.wednesday night...northeast winds 5 to 15 knots becoming east
and increasing to 15 to 25 knots. a chance of rain and snow
showers overnight. waves 1 to 2 feet building to 4 to 6 feet. 
.thursday...east winds 15 to 25 knots becoming south. rain
showers with a chance of snow showers during the day, then rain
showers thursday night. waves 5 to 9 feet subsiding to 3 to
6 feet. waves occasionally around 11 feet. 
.friday...southwest winds 15 to 20 knots becoming northwest 10 to
15 knots. showers during the day, then a chance of showers friday
night. waves 3 to 6 feet subsiding to 2 to 4 feet. 
.saturday...northeast winds 15 to 20 knots becoming southwest. a
chance of showers during the day, then showers likely saturday
night. waves 2 to 3 feet building to 3 to 5 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
409 pm edt mon mar 30 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 frontal zone will stall near the lake through tuesday. 
a 29.6 inch low will move across southern ontario province tuesday 
evening before reaching the canadian maritimes wednesday, with a 
trailing cold front moving south across the lake. a 30.6 inch high 
will then build east across ontario and quebec wednesday through 
thursday. a 29.6 inch low is then forecast to move into the central 
great lakes thursday night before reaching southern quebec late 
friday.


loz063>065-310300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
409 pm edt mon mar 30 2026

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

winds and waves higher in and near thunderstorms.

$$