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open lake forecast for lake ontario
national weather service buffalo ny
1020 am edt sat apr 25 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 29.7 inch low will pass through the lower lakes today 
then slide southeast into the mid atlantic region. a 30.3 inch area 
of high pressure will build in across the lower great lakes tonight 
through monday. a 29.4 inch area of low pressure over the great 
plains monday night, will advance northeast into the upper great 
lakes later monday night into tuesday morning while pushing an 
attendant warm front across the lake before heading northeast to 
james bay tuesday night sending an attendant cold front across the 
lake. an inverted trough averaging 29.7 inch inverted trough is 
expected across the lake from wednesday through wednesday night.


loz062-252100-
lake ontario open waters from the niagara river to hamlin beach-
1020 am edt sat apr 25 2026

.this afternoon...east winds to 30 knots becoming northeast.
showers. waves 7 to 11 feet. waves occasionally around 14 feet. 
.tonight...northeast winds 15 to 25 knots diminishing to 10 to
15 knots. a chance of showers early. waves 6 to 9 feet subsiding
to 1 to 3 feet. waves occasionally around 11 feet. 
.sunday...northeast winds 5 to 10 knots becoming east. waves 1 to
3 feet. 
.sunday night...east winds 10 knots or less. waves 1 foot or
less. 
.monday...east winds 5 to 15 knots becoming southeast. waves
2 feet or less. 
.tuesday...southeast winds 5 to 15 knots becoming southwest.
showers likely. waves 1 to 3 feet. 
.wednesday...west winds 5 to 10 knots becoming northwest. a
chance of showers. waves 2 feet or less. 

$$

fzus61 kbuf 251420
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expires:202604252100;;500507

open lake forecast for lake ontario
national weather service buffalo ny
1020 am edt sat apr 25 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 29.7 inch low will pass through the lower lakes today 
then slide southeast into the mid atlantic region. a 30.3 inch area 
of high pressure will build in across the lower great lakes tonight 
through monday. a 29.4 inch area of low pressure over the great 
plains monday night, will advance northeast into the upper great 
lakes later monday night into tuesday morning while pushing an 
attendant warm front across the lake before heading northeast to 
james bay tuesday night sending an attendant cold front across the 
lake. an inverted trough averaging 29.7 inch inverted trough is 
expected across the lake from wednesday through wednesday night.


loz063>065-252100-
lake ontario open waters from hamlin beach to the saint lawrence
river-
1020 am edt sat apr 25 2026

.this afternoon...east winds 15 to 25 knots becoming northeast.
showers. waves 5 to 8 feet. waves occasionally around 10 feet. 
.tonight...east winds 15 to 20 knots diminishing to 5 to
15 knots. showers likely early, then a chance of showers late in
the evening. waves 3 to 6 feet subsiding to 1 to 3 feet. 
.sunday...northeast winds 10 knots or less becoming northwest.
waves 1 foot or less. 
.sunday night...northwest winds less than 10 knots becoming
north. waves 1 foot or less. 
.monday...northeast winds 10 knots or less becoming southeast
10 to 15 knots. waves 2 feet or less. 
.tuesday...southeast winds 15 to 20 knots becoming south. showers
likely. waves 1 to 3 feet building to 2 to 4 feet. 
.wednesday...south winds 15 to 20 knots becoming west 5 to
15 knots. showers likely. waves 1 to 3 feet. 

$$

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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
1003 am edt sat apr 25 2026


slz022-024-252100-
saint lawrence river from cape vincent to saint regis
1003 am edt sat apr 25 2026

.this afternoon...northeast winds 10 to 15 knots. partly sunny,
then becoming mostly cloudy. 
.tonight...northeast winds 5 to 10 knots becoming light and
variable. mostly cloudy. 
.sunday...light and variable winds. sunny.
.sunday night...northeast winds less than 10 knots. mainly clear.
.monday...light and variable winds becoming southeast 5 to
10 knots. mainly clear. 
.tuesday...southeast winds 5 to 10 knots becoming south and
increasing to 15 to 20 knots. a chance of showers. 
.wednesday...south winds 10 knots or less. showers likely. 

$$