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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 pm edt tue may 19 2026


slz022-024-200900-
saint lawrence river from cape vincent to saint regis
1003 pm edt tue may 19 2026

.rest of tonight...southwest winds 10 to 15 knots. a chance of
showers and thunderstorms late this evening, then a chance of
showers after midnight. 
.wednesday...southwest winds 5 to 15 knots becoming west. mostly
cloudy early, then becoming mostly sunny. 
.wednesday night...northwest winds 5 to 15 knots becoming north.
partly cloudy. 
.thursday...north winds 10 knots or less becoming northwest.
sunny.
.thursday night...northwest winds less than 10 knots. mainly
clear. 
.friday...light and variable winds. a chance of showers friday
night. 
.saturday...east winds 5 to 10 knots becoming southeast. a chance
of showers. 
.sunday...southeast winds 10 knots or less becoming south. a
chance of showers during the day, then showers likely 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
1002 pm edt tue may 19 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...an 29.6 inch area of low pressure over western quebec 
this evening will swing a cold front across the lake late tonight. a 
large 30.4 inch area of surface high pressure will then build across 
the entire great lakes region wednesday afternoon through thursday, 
before sliding east off the new england coast late friday. this 
surface high will then strengthen to 30.6 inches as it anchors over 
atlantic canada through sunday.  a 29.9 inch low and attendant warm 
front will then slowly approach the lake later friday night and 
saturday, before weakening and sliding eastward sunday with the 
large area of high pressure over atlantic canada.


loz062-200900-
lake ontario open waters from the niagara river to hamlin beach-
1002 pm edt tue may 19 2026

.rest of tonight...southwest winds 15 to 20 knots becoming west.
showers with a chance of thunderstorms late this evening, then a
chance of showers after midnight. showers likely late. waves 3 to
5 feet. 
.wednesday...northwest winds 10 to 15 knots becoming west. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.wednesday night...northwest winds 10 to 15 knots becoming north.
waves 1 to 3 feet. 
.thursday...northeast winds 5 to 15 knots becoming southeast.
waves 2 feet or less. 
.thursday night...east winds 10 knots or less. waves 1 foot or
less. 
.friday...east winds 10 to 15 knots increasing to 15 to 20 knots.
showers likely friday night. waves 2 feet or less building to
2 to 4 feet. 
.saturday...east winds 15 to 25 knots. showers likely. waves 3 to
6 feet. 
.sunday...east winds 5 to 15 knots becoming southwest less than
10 knots. showers likely during the day, then a chance of showers
sunday night. waves 1 to 3 feet subsiding to 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1002 pm edt tue may 19 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...an 29.6 inch area of low pressure over western quebec 
this evening will swing a cold front across the lake late tonight. a 
large 30.4 inch area of surface high pressure will then build across 
the entire great lakes region wednesday afternoon through thursday, 
before sliding east off the new england coast late friday. this 
surface high will then strengthen to 30.6 inches as it anchors over 
atlantic canada through sunday.  a 29.9 inch low and attendant warm 
front will then slowly approach the lake later friday night and 
saturday, before weakening and sliding eastward sunday with the 
large area of high pressure over atlantic canada.


loz063>065-200900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 pm edt tue may 19 2026

.rest of tonight...southwest winds 15 to 20 knots becoming west.
showers likely with a chance of thunderstorms late this evening,
then showers likely after midnight. waves 2 to 4 feet. 
.wednesday...west winds 15 to 20 knots. a chance of showers
early. waves 2 to 4 feet building to 3 to 6 feet. 
.wednesday night...west winds 15 to 20 knots becoming north 10 to
15 knots. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.thursday...northeast winds 5 to 15 knots becoming west. waves
1 to 3 feet subsiding to 1 foot or less. 
.thursday night...west winds less than 10 knots. waves 1 foot or
less. 
.friday...east winds 5 to 15 knots increasing to 15 to 20 knots.
a chance of showers friday night. waves 1 to 3 feet. 
.saturday...east winds 15 to 20 knots becoming southeast. showers
likely. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.sunday...southeast winds 15 to 20 knots becoming south 10 to
15 knots. showers likely during the day, then a chance of showers
sunday night. waves 2 to 4 feet subsiding to 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$