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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
451 pm edt fri apr 24 2026


slz022-024-250300-
saint lawrence river from cape vincent to saint regis
451 pm edt fri apr 24 2026

.tonight...northeast winds 5 to 10 knots becoming east. mainly
clear through the early overnight, then becoming partly cloudy. 
.saturday...northeast winds 5 to 10 knots. partly to mostly
sunny. 
.saturday night...northeast winds 5 to 10 knots becoming light
and variable. mostly cloudy in the evening, then becoming partly
cloudy. 
.sunday...northeast winds less than 10 knots. sunny.
.sunday night...northeast winds less than 10 knots. mainly clear.
.monday...light and variable winds. mainly clear. 
.tuesday...southeast winds 5 to 10 knots becoming south and
increasing to 15 to 20 knots. a chance of showers. 
.wednesday...south winds 5 to 15 knots becoming southwest less
than 10 knots. a chance of showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
450 pm edt fri apr 24 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 29.6 inch low will slightly weaken to 29.7 inches as 
it passes just southwest of lake tonight, while nudging a warm front 
a bit further east over the lake. the low then slide southeast into 
the mid atlantic region saturday forcing the front back to the 
southwest of the lake. a 30.2 inch area of high pressure will build 
across the lower great lakes saturday night through monday. a 29.4 
inch area of low pressure over the great plains monday night, will 
advance northeast into the upper great lakes later monday night into 
tuesday morning while pushing an attendant warm front across the 
lake before heading northeast to james bay tuesday night sending an 
attendant cold front across the lake.


loz062-250300-
lake ontario open waters from the niagara river to hamlin beach-
450 pm edt fri apr 24 2026

.tonight...east winds 15 to 20 knots. a chance of rain showers.
rain showers late. waves 2 to 4 feet building to 3 to 5 feet. 
.saturday...east winds 20 to 25 knots. rain showers in the
morning, then a chance of rain showers in the afternoon. waves
4 to 7 feet building to 5 to 9 feet. waves occasionally around
11 feet. 
.saturday night...east winds 15 to 20 knots becoming northeast
10 to 15 knots. waves 4 to 7 feet subsiding to 1 to 3 feet. waves
occasionally around 9 feet. 
.sunday...northeast winds 5 to 15 knots becoming east. waves
2 feet or less. 
.sunday night...east winds 10 knots or less. waves 1 foot or
less. 
.monday...east winds 5 to 15 knots becoming southeast. waves
2 feet or less. 
.tuesday...southeast winds 10 to 15 knots becoming southwest.
showers likely. waves 1 to 3 feet. 
.wednesday...west winds 5 to 10 knots becoming northwest. a
chance of showers. waves 1 to 2 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
450 pm edt fri apr 24 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 29.6 inch low will slightly weaken to 29.7 inches as 
it passes just southwest of lake tonight, while nudging a warm front 
a bit further east over the lake. the low then slide southeast into 
the mid atlantic region saturday forcing the front back to the 
southwest of the lake. a 30.2 inch area of high pressure will build 
across the lower great lakes saturday night through monday. a 29.4 
inch area of low pressure over the great plains monday night, will 
advance northeast into the upper great lakes later monday night into 
tuesday morning while pushing an attendant warm front across the 
lake before heading northeast to james bay tuesday night sending an 
attendant cold front across the lake.


loz063>065-250300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
450 pm edt fri apr 24 2026

.tonight...northeast winds 5 to 15 knots becoming east 15 to
20 knots. a chance of rain showers late. waves 1 to 3 feet
building to 2 to 4 feet. 
.saturday...east winds 15 to 20 knots becoming northeast. a
chance of showers early, then showers likely. a chance of showers
late. waves 3 to 6 feet. 
.saturday night...east winds 15 to 20 knots diminishing to 5 to
15 knots. a chance of showers in the evening. waves 2 to 4 feet
subsiding to 1 foot or less. 
.sunday...northeast winds 5 to 10 knots becoming north. waves
1 foot or less. 
.sunday night...north winds less than 10 knots becoming
northeast. waves 1 foot or less. 
.monday...northeast winds 10 knots or less becoming southeast
10 to 15 knots. waves 2 feet or less. 
.tuesday...southeast winds 15 to 20 knots becoming south. a
chance of showers. waves 1 to 3 feet building to 2 to 4 feet. 
.wednesday...southwest winds 5 to 15 knots becoming west. a
chance of showers. waves 1 to 3 feet. 

$$