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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt fri may 22 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 slide east from the great 
lakes and off the new england coast tonight. this 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>065-230300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt fri may 22 2026

.tonight...northeast winds 15 to 20 knots becoming east. waves
1 to 3 feet building to 2 to 4 feet. 
.saturday...east winds 15 to 20 knots becoming southeast. a
chance of showers late in the morning. showers in the afternoon.
waves 1 to 3 feet building to 3 to 5 feet. 
.saturday night...southeast winds 15 to 25 knots. showers. 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
6 feet. 
.sunday night...southeast winds 15 to 20 knots becoming south
10 to 15 knots. showers likely overnight. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.monday...southwest winds 10 knots or less. showers likely during
the day. waves 2 feet or less. 
.tuesday...southwest winds 5 to 10 knots becoming west. waves
1 foot or less. 
.wednesday...northwest winds 5 to 10 knots becoming north. waves
1 foot or less. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt fri may 22 2026


slz022-024-230300-
saint lawrence river from cape vincent to saint regis
403 pm edt fri may 22 2026

.tonight...northeast winds 5 to 15 knots becoming east. partly to
mostly cloudy. 
.saturday...east winds 10 knots or less becoming southeast.
partly sunny early, then becoming mostly cloudy. 
.saturday night...south winds 5 to 10 knots becoming southeast.
showers.
.sunday...southeast winds 5 to 10 knots. showers.
.sunday night...southeast winds 10 knots or less becoming south.
a chance of showers in the evening, then showers likely
overnight. 
.monday...southwest winds less than 10 knots. showers likely
during the day. 
.tuesday...southwest winds 10 knots or less becoming west. a
chance of showers tuesday night. 
.wednesday...northwest winds 10 knots or less becoming north.
becoming mainly clear. 

$$