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


slz022-024-191500-
saint lawrence river from cape vincent to saint regis
403 am edt tue may 19 2026

.today...southwest winds 10 to 15 knots. mostly cloudy this
morning, then becoming mostly sunny. 
.tonight...southwest winds 10 to 15 knots. a chance of showers
through the early overnight, then showers likely late. 
.wednesday...southwest winds 5 to 15 knots becoming northwest. a
chance of showers in the morning. 
.wednesday night...northwest winds 5 to 15 knots becoming north.
mainly clear. 
.thursday...north winds 5 to 10 knots becoming light and
variable. mainly clear, then becoming partly cloudy. 
.friday...light and variable winds. a chance of showers friday
night. 
.saturday...east winds 10 knots or less. showers likely. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 the upper great 
lakes this morning, will move northeast into central quebec by 
wednesday morning while strengthening to 29.4 inches. a cold front 
attendant to this low will cross the lake tonight into wednesday 
morning. a large 30.4 inch high will then build across the entire 
great lakes region wednesday afternoon through thursday, before 
sliding east off the new england coast late friday. a 29.9 inch low 
and attendant warm front will then slowly approach the lake later 
friday night and saturday.


loz062-191500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt tue may 19 2026

.today...southwest winds 10 to 15 knots increasing to 15 to
20 knots. a chance of showers early. waves 2 to 4 feet building
to 3 to 5 feet. 
.tonight...southwest winds 15 to 20 knots becoming west. showers
with a chance of thunderstorms in the evening, then showers
likely after midnight. waves 3 to 5 feet. 
.wednesday...northwest winds 10 to 15 knots becoming west. a
chance of showers in the morning. 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 east 10 knots
or less. waves 2 feet 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
3 to 5 feet. 
.saturday...east winds 15 to 25 knots diminishing to 10 to
15 knots. showers likely. waves 4 to 7 feet subsiding to 2 to
4 feet. waves occasionally around 9 feet. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am 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 the upper great 
lakes this morning, will move northeast into central quebec by 
wednesday morning while strengthening to 29.4 inches. a cold front 
attendant to this low will cross the lake tonight into wednesday 
morning. a large 30.4 inch high will then build across the entire 
great lakes region wednesday afternoon through thursday, before 
sliding east off the new england coast late friday. a 29.9 inch low 
and attendant warm front will then slowly approach the lake later 
friday night and saturday.


loz063>065-191500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt tue may 19 2026

.today...southwest winds 10 to 15 knots. a chance of showers
early. waves 1 to 3 feet building to 2 to 4 feet. 
.tonight...southwest winds 10 to 15 knots becoming west 15 to
20 knots. a chance of showers and thunderstorms early, then
showers with a chance of thunderstorms. a chance of showers late.
waves 2 to 4 feet. 
.wednesday...west winds 15 to 20 knots. a chance of showers in
the morning. 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 diminishing to less
than 10 knots. waves 1 to 3 feet subsiding to 1 foot or less. 
.friday...east winds 5 to 15 knots increasing to 15 to 20 knots.
showers likely friday night. waves 1 to 3 feet building to 2 to
4 feet. 
.saturday...east winds 15 to 25 knots becoming southeast.
showers. waves 3 to 6 feet subsiding to 2 to 4 feet. 

winds and waves higher in and near thunderstorms.

$$