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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1001 am edt sat may 23 2026


slz022-024-232100-
saint lawrence river from cape vincent to saint regis
1001 am edt sat may 23 2026

.this afternoon...east winds 5 to 10 knots becoming southeast.
cloudy.
.tonight...south winds 5 to 10 knots becoming southeast. a chance
of showers in the evening, then showers after midnight. 
.sunday...southeast winds 5 to 10 knots. showers.
.sunday night...southeast winds 10 knots or less becoming south.
a chance of showers. 
.monday...light and variable winds. a chance of showers during
the day. 
.tuesday...southwest winds 10 knots or less. partly cloudy. 
.wednesday...west winds 10 knots or less becoming north. becoming
mainly clear. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
1000 am edt sat may 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 large 30.4 inch high will strengthen to 30.6 inches as 
it anchors over atlantic canada through sunday. a 29.9 inch low and 
attendant warm front will then approach the lower great lakes late 
tonight and saturday, before weakening and sliding eastward sunday. 
a 30.1 inch high will settle across the region monday through 
tuesday. a cold front associated with a 29.8 inch low over new 
england will drop south across the lake on wednesday. high pressure 
over canada will start to expand south over the lake on thursday.


loz063>065-232100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1000 am edt sat may 23 2026

.this afternoon...southeast winds 15 to 25 knots. rain. waves 1 to
3 feet building to 3 to 5 feet. 
.tonight...southeast winds 15 to 25 knots. rain early, then
showers from late evening on. waves 3 to 6 feet building to 4 to
7 feet, then subsiding to 3 to 6 feet. waves occasionally around
9 feet. 
.sunday...southeast winds 15 to 25 knots. showers. waves 3 to
5 feet subsiding to 2 to 4 feet. 
.sunday night...southeast winds 15 to 20 knots becoming south
10 to 15 knots. a chance of showers overnight. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.monday...southwest winds 10 knots or less. a chance of showers
during the day. waves 1 foot or less. 
.tuesday...southwest winds 5 to 10 knots becoming west. waves
1 foot or less. 
.wednesday...west winds 5 to 10 knots becoming north. waves
1 foot or less. 

$$