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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 31 2026


slz022-024-010300-
saint lawrence river from cape vincent to saint regis
410 pm edt tue mar 31 2026

.tonight...northeast winds 5 to 10 knots becoming north. rain
showers likely with a chance of thunderstorms early, then rain
showers with a chance of thunderstorms late this evening. rain
showers likely with a chance of thunderstorms after midnight.
some thunderstorms may produce gusty winds through the early
overnight. 
.wednesday...north winds 5 to 10 knots. mostly cloudy. 
.wednesday night...north winds 5 to 10 knots becoming northeast.
mostly cloudy. 
.thursday...northeast winds 5 to 15 knots. rain showers with a
chance of snow showers. 
.thursday night...east winds 5 to 15 knots becoming south 15 to
20 knots. rain showers. 
.friday...south winds 15 to 20 knots becoming northwest and
diminishing to 5 to 10 knots. rain showers during the day. 
.saturday...north winds 5 to 15 knots becoming south. a chance of
rain showers during the day, then rain showers saturday night. 
.sunday...southwest winds 10 to 15 knots becoming west. rain
showers during the day, then a chance of rain showers sunday
night. 

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 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.


loz062-010300-
lake ontario open waters from the niagara river to hamlin beach-
409 pm edt tue mar 31 2026

.tonight...southeast winds 5 to 15 knots becoming northwest. rain
showers with a chance of thunderstorms this evening, then a
chance of rain showers after midnight. patchy fog late this
evening. some thunderstorms may produce gusty winds this evening.
waves 1 to 2 feet. 
.wednesday...northwest winds 5 to 10 knots becoming northeast.
waves 2 feet or less. 
.wednesday night...east winds 5 to 15 knots increasing to 15 to
20 knots. a chance of rain showers overnight. waves 2 feet or
less building to 3 to 5 feet. 
.thursday...east winds 15 to 25 knots. rain showers likely. waves
4 to 7 feet. waves occasionally around 9 feet. 
.thursday night...east winds 15 to 20 knots becoming south. rain
showers likely. waves 3 to 6 feet. 
.friday...southwest winds 15 to 25 knots becoming north and
diminishing to around 10 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...east winds 15 to 25 knots becoming southwest.
showers. waves 2 to 4 feet building to 3 to 6 feet. 
.sunday...west winds 20 to 25 knots becoming northwest. rain
showers likely during the day, then a chance of rain showers
sunday night. waves 5 to 8 feet. waves occasionally around
10 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 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>065-010300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
409 pm edt tue mar 31 2026

.tonight...east winds 5 to 15 knots becoming northwest. rain
showers with a chance of thunderstorms this evening, then rain
showers likely with a chance of thunderstorms after midnight.
patchy fog late this evening. some thunderstorms may produce
gusty winds through the early overnight. waves 2 feet or less. 
.wednesday...northwest winds 5 to 15 knots becoming north. waves
2 feet or less. 
.wednesday night...northeast winds 5 to 15 knots increasing to
15 to 20 knots. a chance of rain showers overnight. waves 1 to
3 feet building to 2 to 4 feet. 
.thursday...northeast winds 15 to 20 knots becoming east. rain
showers likely. waves 3 to 5 feet. 
.thursday night...east winds 15 to 25 knots becoming south to
30 knots. showers likely. waves 3 to 5 feet building to 5 to
8 feet. waves occasionally around 10 feet. 
.friday...south winds to 30 knots becoming northwest and
diminishing to 10 to 15 knots. rain showers likely during the
day, then a chance of rain showers friday night. waves 4 to
7 feet subsiding to 2 to 4 feet. waves occasionally around
9 feet. 
.saturday...northeast winds 10 to 15 knots becoming southwest and
increasing to 15 to 25 knots. a chance of rain showers during the
day, then rain showers saturday night. waves 1 to 3 feet building
to 3 to 6 feet. 
.sunday...southwest winds to 30 knots becoming northwest. rain
showers during the day, then a chance of rain showers sunday
night. waves 5 to 8 feet building to 7 to 10 feet. waves
occasionally around 13 feet. 

winds and waves higher in and near thunderstorms.

$$