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


slz022-024-241500-
saint lawrence river from cape vincent to saint regis
404 am edt fri apr 24 2026

.today...north winds 10 knots or less becoming northeast. sunny.
.tonight...northeast winds 10 knots or less 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. partly to mostly cloudy. 
.sunday...northeast winds less than 10 knots. mainly clear. 
.monday...light and variable winds becoming southeast 5 to
10 knots. mainly clear. 
.tuesday...southeast winds 5 to 15 knots becoming south. a chance
of showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am 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 strong 30.7 inch high centered well to the north will 
remain ridged south across the lake through today. a 29.6 inch low 
over the upper great lakes this morning will nudge a warm front 
toward the lake as it moves into the central great lakes this 
afternoon. this low will slightly weaken to 29.7 inches as it passes 
just southwest of lake tonight while nudging the 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 then 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. the 29.4 inch low will then continue northeast to james bay 
tuesday night sending an attendant cold front across the lake.


loz062-241500-
lake ontario open waters from the niagara river to hamlin beach-
403 am edt fri apr 24 2026

.today...east winds 15 to 20 knots. waves 2 to 4 feet. 
.tonight...east winds 15 to 25 knots. a chance of rain showers
after midnight. rain showers likely late. waves 2 to 4 feet
building to 3 to 6 feet. 
.saturday...east winds to 30 knots. rain showers likely. waves
5 to 9 feet. waves occasionally around 11 feet. 
.saturday night...east winds 15 to 25 knots diminishing to 10 to
15 knots. a chance of showers in the evening. waves 5 to 8 feet
subsiding to 1 to 3 feet. waves occasionally around 10 feet. 
.sunday...northeast winds 10 knots or less becoming east. waves
2 feet or less. 
.monday...east winds 5 to 15 knots becoming southeast. waves 1 to
3 feet. 
.tuesday...southeast winds 15 to 20 knots becoming southwest
10 to 15 knots. showers likely. waves 2 to 4 feet subsiding to
1 to 3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
403 am 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 strong 30.7 inch high centered well to the north will 
remain ridged south across the lake through today. a 29.6 inch low 
over the upper great lakes this morning will nudge a warm front 
toward the lake as it moves into the central great lakes this 
afternoon. this low will slightly weaken to 29.7 inches as it passes 
just southwest of lake tonight while nudging the 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 then 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. the 29.4 inch low will then continue northeast to james bay 
tuesday night sending an attendant cold front across the lake.


loz063>065-241500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 am edt fri apr 24 2026

.today...northeast winds 5 to 15 knots. waves 1 to 3 feet. 
.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 25 knots. showers likely. 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 3 to 5 feet
subsiding to 2 feet or less. 
.sunday...east winds 10 knots or less becoming northeast. waves
1 foot or less. 
.monday...east winds 10 knots or less becoming southeast 10 to
15 knots. waves 1 to 3 feet. 
.tuesday...southeast winds 15 to 20 knots becoming south. showers
likely. waves 2 to 4 feet subsiding to 1 to 3 feet. 

$$