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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1011 am edt mon apr 13 2026


slz022-024-132100-
saint lawrence river from cape vincent to saint regis
1011 am edt mon apr 13 2026

.this afternoon...southwest winds 10 to 15 knots. showers, then a
chance of showers late. 
.tonight...southwest winds 10 to 15 knots becoming light and
variable. mostly cloudy. 
.tuesday...northeast winds 10 knots or less becoming southwest.
showers likely in the morning, then showers with a chance of
thunderstorms in the afternoon. 
.tuesday night...southwest winds 10 knots or less. showers with a
chance of thunderstorms in the evening, then showers likely
overnight. 
.wednesday...southwest winds 10 knots or less becoming northeast.
showers likely during the day, then a chance of showers wednesday
night. 
.thursday...east winds 5 to 10 knots becoming southwest. showers.
.friday...west winds 10 knots or less becoming southeast. a
chance of showers during the day. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1010 am edt mon apr 13 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 29.3 inch low will move across northern quebec today, 
with a trailing weak trough crossing the lake. a 29.6 inch low will 
then move into the central great lakes tuesday morning before 
weakening across the saint lawrence valley tuesday night. another 
29.6 inch low will move into the central great lakes wednesday night 
before reaching southern quebec thursday night. a 30.0 inch high is 
then forecast to build from the central great lakes friday to the 
lower great lakes saturday.


loz063>065-132100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1010 am edt mon apr 13 2026

.rest of today...southwest winds 15 to 20 knots. showers. waves
2 to 4 feet building to 3 to 5 feet. 
.tonight...west winds 15 to 20 knots becoming south and
diminishing to less than 10 knots after midnight. waves 2 to
4 feet subsiding to 1 to 3 feet. 
.tuesday...southeast winds 5 to 15 knots becoming southwest.
showers in the morning, then showers with a chance of
thunderstorms in the afternoon. waves 1 to 3 feet. 
.tuesday night...southwest winds 15 to 20 knots diminishing to
5 to 15 knots. showers with a chance of thunderstorms. waves 1 to
3 feet. 
.wednesday...southwest winds 5 to 10 knots becoming south.
showers likely with a chance of thunderstorms during the day,
then showers likely wednesday night. waves 2 feet or less. 
.thursday...south winds 5 to 15 knots becoming southwest 15 to
20 knots. showers likely. waves 1 to 3 feet. 
.friday...west winds 15 to 20 knots becoming south and
diminishing to 10 knots or less. a chance of showers during the
day. waves 1 to 3 feet subsiding to 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$