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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1005 pm edt thu apr 23 2026


slz022-024-240900-
saint lawrence river from cape vincent to saint regis
1005 pm edt thu apr 23 2026

.overnight...north winds 10 knots or less. partly to mostly
cloudy. 
.friday...north winds 10 knots or less becoming northeast. sunny.
.friday night...northeast winds 10 knots or less becoming east.
mainly clear. 
.saturday...northeast winds 5 to 10 knots. partly to mostly
sunny. 
.saturday night...northeast winds 10 knots or less. mostly
cloudy. 
.sunday...northeast winds less than 10 knots. becoming mainly
clear. 
.monday...light and variable winds becoming southeast 5 to
10 knots. becoming mainly clear. 
.tuesday...southeast winds 5 to 15 knots becoming south. showers
likely. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1004 pm edt thu apr 23 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 friday. a 29.6 inch low 
over the upper great lakes friday morning will nudge a warm front 
toward the lake as it moves into the central great lakes friday 
afternoon. this low will slightly weaken to 29.7 inches as it passes 
just southwest of lake friday night while nudging the warm front a 
bit further east over the lake. the low then slides 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>065-240900-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1004 pm edt thu apr 23 2026

.overnight...northeast winds 10 knots or less increasing to
10 to 15 knots. waves 2 feet or less. 
.friday...northeast winds 5 to 15 knots. waves 2 feet or less. 
.friday night...northeast winds 5 to 15 knots becoming east 15 to
20 knots. a chance of showers overnight. waves 2 feet or less
building to 2 to 4 feet. 
.saturday...east winds 15 to 20 knots. showers likely. waves 3 to
5 feet. 
.saturday night...east winds 5 to 15 knots. rain showers likely
in the evening, then a chance of rain showers overnight. waves
2 to 4 feet subsiding to 1 to 3 feet. 
.sunday...east winds 5 to 10 knots becoming light and variable.
waves 1 foot or less. 
.monday...east winds 10 knots or less becoming southeast and
increasing to 15 to 20 knots. waves 1 to 3 feet. 
.tuesday...southeast winds 15 to 20 knots becoming south. showers
likely. waves 2 to 4 feet building to 3 to 5 feet, then subsiding
to 2 to 4 feet. 

$$