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open lake forecast for lake ontario
national weather service buffalo ny
403 pm 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 cross the lower great lakes through 
tonight, 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 morning. high pressure over 
canada will start to expand south over the lake on thursday.


loz062-240300-
lake ontario open waters from the niagara river to hamlin beach-
403 pm edt sat may 23 2026

.tonight...east winds to 30 knots diminishing to 15 to 20 knots.
rain. waves 5 to 8 feet subsiding to 3 to 6 feet. waves
occasionally around 10 feet. 
.sunday...east winds 15 to 20 knots diminishing to less than
10 knots in the afternoon. showers likely early. waves 3 to
5 feet subsiding to 1 to 3 feet. 
.sunday night...east winds 5 to 10 knots becoming light and
variable. a chance of showers in the evening, then showers likely
overnight. waves 1 foot or less. 
.monday...light and variable winds. a chance of showers in the
morning. waves 1 foot or less. 
.monday night...southwest winds less than 10 knots. waves 1 foot
or less. 
.tuesday...southwest winds 10 knots or less. waves 1 foot or
less. 
.wednesday...west winds 5 to 10 knots becoming north. waves
1 foot or less. 
.thursday...north winds 5 to 10 knots. waves 1 foot or less. 

$$

fzus61 kbuf 232003
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open lake forecast for lake ontario
national weather service buffalo ny
403 pm 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 cross the lower great lakes through 
tonight, 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 morning. high pressure over 
canada will start to expand south over the lake on thursday.


loz063>065-240300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
403 pm edt sat may 23 2026

.tonight...southeast winds 15 to 25 knots. rain. waves 4 to
7 feet subsiding to 3 to 6 feet. waves occasionally around
9 feet. 
.sunday...southeast winds 15 to 25 knots. rain early, then
showers likely late in the morning. waves 3 to 5 feet. 
.sunday night...southeast winds 15 to 20 knots diminishing to
5 to 15 knots. showers likely overnight. waves 2 to 4 feet
subsiding to 1 to 3 feet. 
.monday...southwest winds 10 knots or less becoming west. showers
likely in the morning. waves 1 foot or less. 
.monday night...southwest winds 10 knots or less. 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. 
.thursday...north winds 5 to 10 knots. waves 2 feet 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 sat may 23 2026


slz022-024-240300-
saint lawrence river from cape vincent to saint regis
403 pm edt sat may 23 2026

.tonight...southeast winds 5 to 10 knots. a chance of showers
early, then rain from late evening on. 
.sunday...southeast winds 5 to 10 knots. rain in the morning,
then a chance of showers early in the afternoon. 
.sunday night...southeast winds 10 knots or less. occasional
showers overnight. 
.monday...light and variable winds becoming southwest 5 to
10 knots. showers likely in the morning, then a chance of showers
in the afternoon. 
.monday night...southwest winds 10 knots or less. partly cloudy. 
.tuesday...southwest winds 10 knots or less. mainly clear. 
.wednesday...west winds 10 knots or less becoming north. a chance
of showers. 
.thursday...north winds 5 to 10 knots becoming northwest. mainly
clear, then becoming partly cloudy. 

$$