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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt mon jul 20 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 30.0 inch area of high pressure will build across the great lakes 
today, followed by a warm front crossing the lake tonight and 
another cold front tuesday night, with these fronts attached to a 
29.4 inch area of low pressure near james bay. a secondary cold 
front will cross the lake wednesday, with a 30.1 inch high building 
across the lower great lakes region wednesday night through friday.


loz063>065-201500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon jul 20 2026

.today...west winds 10 knots or less becoming east. waves 1 foot
or less. 
.tonight...east winds 5 to 15 knots becoming south 15 to
20 knots. waves 1 foot or less building to 2 to 4 feet. 
.tuesday...south winds 15 to 20 knots. showers with a chance of
thunderstorms. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.tuesday night...southwest winds 10 to 15 knots becoming west
15 to 20 knots. showers with a chance of thunderstorms. waves
1 to 3 feet building to 3 to 6 feet. 
.wednesday...west winds 15 to 25 knots. showers likely during the
day. waves 5 to 8 feet subsiding to 3 to 5 feet. waves
occasionally around 10 feet. 
.thursday...west winds 5 to 15 knots becoming southwest. waves
1 to 3 feet subsiding to 1 foot or less. 
.friday...southwest winds 10 knots or less becoming south. waves
1 foot or less. 

winds and waves higher in and near thunderstorms.

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt mon jul 20 2026


slz022-024-201500-
saint lawrence river from cape vincent to saint regis
403 am edt mon jul 20 2026

.today...light and variable winds becoming southwest 5 to
10 knots. sunny.
.tonight...southwest winds 10 knots or less becoming south 10 to
15 knots. partly cloudy early, then becoming mostly cloudy. 
.tuesday...south winds 10 to 15 knots. a chance of showers in the
morning, then showers with a chance of thunderstorms in the
afternoon. 
.tuesday night...south winds 5 to 15 knots becoming southwest.
showers with a chance of thunderstorms in the evening, then
showers overnight. 
.wednesday...west winds 5 to 15 knots. showers during the day,
then a chance of showers wednesday night. 
.thursday...west winds 5 to 10 knots becoming light and variable.
mainly clear. 
.friday...southwest winds less than 10 knots. mainly clear, then
becoming partly cloudy. 

winds and waves higher in and near thunderstorms.

$$