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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt mon may 18 2026


slz022-024-190300-
saint lawrence river from cape vincent to saint regis
403 pm edt mon may 18 2026

.tonight...southwest winds 5 to 10 knots. a chance of showers
late. 
.tuesday...southwest winds 5 to 15 knots. a chance of showers
early. 
.tuesday night...southwest winds 10 to 15 knots. showers likely. 
.wednesday...southwest winds 10 to 15 knots becoming west. a
chance of showers in the morning. 
.wednesday night...northwest winds 5 to 15 knots becoming north.
mainly clear in the evening, then becoming partly cloudy. 
.thursday...north winds 5 to 10 knots becoming light and
variable. mainly clear. 
.friday...light and variable winds. a chance of showers friday
night. 
.saturday...east winds 10 knots or less becoming southeast. a
chance of showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt mon may 18 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 area of low pressure developing over the central 
plains today will weaken from 29.4 inches to 29.6 inches as it 
tracks northeast to the upper great lakes tonight into tuesday 
morning, then to central quebec wednesday while strengthening to 
29.4 inches. a cold front attendant to this low will cross the lake 
late tuesday night into wednesday morning. a large 30.4 inch high 
will then build across the entire great lakes region wednesday night 
through thursday. high pressure will move to the east and weaken to 
30.1 inches friday. a 29.9 inch low will track across the ohio 
valley and near the lake saturday.


loz063>065-190300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt mon may 18 2026

.tonight...south winds 5 to 10 knots becoming southwest. a chance
of showers. waves 2 feet or less. 
.tuesday...southwest winds 10 to 15 knots. waves 1 to 3 feet
building to 2 to 4 feet. 
.tuesday night...southwest winds 15 to 20 knots becoming west.
showers likely with a chance of thunderstorms in the evening,
then showers likely overnight. waves 2 to 4 feet building to 3 to
5 feet. 
.wednesday...west winds 15 to 25 knots. a chance of showers in
the morning. waves 3 to 6 feet building to 4 to 7 feet. waves
occasionally around 9 feet. 
.wednesday night...west winds 15 to 20 knots becoming north 10 to
15 knots. waves 4 to 7 feet subsiding to 2 to 4 feet. waves
occasionally around 9 feet. 
.thursday...north winds 5 to 15 knots becoming east less than
10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.friday...east winds 5 to 15 knots. a chance of showers friday
night. waves 1 to 3 feet. 
.saturday...southeast winds 15 to 20 knots diminishing to 10 to
15 knots. showers likely. waves 2 to 4 feet building to 3 to
5 feet, then subsiding to 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$