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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1012 am edt tue mar 31 2026


slz022-024-312100-
saint lawrence river from cape vincent to saint regis
1012 am edt tue mar 31 2026

.this afternoon...northeast winds 5 to 15 knots. a chance of rain
showers, then rain showers likely with a chance of thunderstorms
late. 
.tonight...northeast winds 5 to 10 knots. rain showers with a
chance of thunderstorms in the evening, then rain showers likely
after midnight. a chance of rain showers late. some thunderstorms
may produce gusty winds early. 
.wednesday...north winds 5 to 10 knots. mostly cloudy. 
.wednesday night...northeast winds 5 to 10 knots. mostly cloudy. 
.thursday...northeast winds 5 to 15 knots becoming southeast
15 to 20 knots. rain and snow showers with freezing rain likely
during the day, then rain 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...northeast winds 5 to 15 knots becoming south. a
chance of rain showers during the day, then rain showers saturday
night. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1010 am edt tue mar 31 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 south shore of the 
lake today. a 29.6 inch low will move across southern ontario 
province this evening before reaching the canadian maritimes 
wednesday, with a trailing cold front moving south across the lake 
tonight. 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.


loz062-312100-
lake ontario open waters from the niagara river to hamlin beach-
1010 am edt tue mar 31 2026

.rest of today...east winds 15 to 20 knots. rain showers likely
with a chance of thunderstorms late this morning, then a chance
of rain showers early this afternoon. rain showers with a chance
of thunderstorms late. some thunderstorms may produce gusty winds
late. waves 2 to 4 feet. 
.tonight...east winds 15 to 20 knots becoming north 10 to
15 knots. rain showers with a chance of thunderstorms in the
evening, then rain showers likely after midnight. a chance of
rain showers late. some thunderstorms may produce gusty winds
early. waves 2 to 4 feet. 
.wednesday...north winds 5 to 15 knots becoming northeast. a
chance of rain showers. waves 1 to 3 feet. 
.wednesday night...east winds 5 to 15 knots becoming northeast
15 to 20 knots. a chance of rain showers. waves 2 feet or less
building to 3 to 5 feet. 
.thursday...east winds 15 to 25 knots becoming south. rain
showers likely. waves 4 to 7 feet subsiding to 3 to 5 feet. waves
occasionally around 9 feet. 
.friday...southwest winds 15 to 25 knots becoming north and
diminishing to 10 to 15 knots. showers likely during the day,
then a chance of showers friday night. waves 3 to 6 feet
subsiding to 2 to 4 feet. 
.saturday...northeast winds 10 to 15 knots becoming southwest
15 to 20 knots. a chance of showers during the day, then showers
likely saturday night. waves 1 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
1010 am edt tue mar 31 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 south shore of the 
lake today. a 29.6 inch low will move across southern ontario 
province this evening before reaching the canadian maritimes 
wednesday, with a trailing cold front moving south across the lake 
tonight. 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>065-312100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1010 am edt tue mar 31 2026

.rest of today...north winds 10 to 15 knots becoming northeast.
rain showers with a chance of thunderstorms late this morning,
then a chance of rain showers early this afternoon. rain showers
with a chance of thunderstorms late. some thunderstorms may
produce gusty winds late. waves 1 to 2 feet. 
.tonight...east winds 10 to 15 knots becoming north. rain showers
with a chance of thunderstorms in the evening, then rain showers
likely with a chance of thunderstorms after midnight. a chance of
rain showers late. some thunderstorms may produce gusty winds
early. waves 1 to 3 feet. 
.wednesday...north winds 5 to 15 knots becoming northeast. a
chance of rain showers. waves 1 to 3 feet. 
.wednesday night...northeast winds 5 to 15 knots increasing to
15 to 20 knots. a chance of rain showers. waves 1 to 3 feet
building to 2 to 4 feet. 
.thursday...northeast winds 15 to 25 knots becoming south to
30 knots. rain showers likely. waves 3 to 6 feet building to 4 to
7 feet. waves occasionally around 9 feet. 
.friday...south winds to 30 knots becoming northwest and
diminishing to 10 to 15 knots. showers likely during the day,
then a chance of showers friday night. waves 4 to 7 feet
subsiding to 2 to 4 feet. waves occasionally around 9 feet. 
.saturday...northeast winds 5 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 4 to 7 feet. waves occasionally around 9 feet. 

winds and waves higher in and near thunderstorms.

$$