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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt fri apr 24 2026


slz022-024-242100-
saint lawrence river from cape vincent to saint regis
1003 am edt fri apr 24 2026

.this afternoon...north winds less than 10 knots 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
1002 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 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 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.


loz062-242100-
lake ontario open waters from the niagara river to hamlin beach-
1002 am edt fri apr 24 2026

.this afternoon...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
1002 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 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 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>065-242100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1002 am edt fri apr 24 2026

.this afternoon...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. 

$$