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open lake forecast for lake ontario
national weather service buffalo ny
408 pm edt tue oct 13 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 warm front over eastern portions of the lake drifts northeastward 
through this evening. otherwise, a cold front sweeps southeastward 
across the lake tonight. behind the cold front, a high pressure 
ridge averaging 30.2 inches builds from the north-central united 
states and vicinity through thursday. during thursday night through 
friday, the ridge should exit eastward and be followed by a warm 
front sweeping quickly northeastward across the lake and then a cold 
front sweeping quickly eastward across the lake as a low tracks 
northeastward from the southwestern great lakes to near southern 
quebec and deepens to 29.3 inches. behind the cold front, a ridge 
averaging 30.5 inches should build from the west through this 
weekend.


loz063>065-140315-
lake ontario open waters from hamlin beach to the saint lawrence
river-
408 pm edt tue oct 13 2026

.tonight...southwest winds 15 to 20 knots becoming west. showers
likely with a chance of thunderstorms early, then a chance of
showers late this evening. waves 1 to 3 feet building to 3 to
5 feet. 
.wednesday...west winds 10 to 15 knots increasing to 15 to
20 knots. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.wednesday night...northwest winds 15 to 20 knots becoming north.
waves 2 to 4 feet. 
.thursday...northeast winds 5 to 15 knots. waves 1 to 3 feet. 
.thursday night...east winds 10 to 15 knots becoming southeast
and increasing to 15 to 25 knots. a chance of showers in the
evening, then showers overnight. waves 1 to 3 feet building to
2 to 4 feet. 
.friday...southwest winds 15 to 25 knots becoming northwest and
increasing to 35 knot gales. rain showers. waves 3 to 6 feet
building to 10 to 14 feet. waves occasionally around 18 feet. 
.saturday...northwest gales to 35 knots becoming west and
diminishing to 15 to 20 knots. a chance of rain showers during
the day. waves 10 to 14 feet subsiding to 3 to 6 feet. waves
occasionally around 18 feet. 
.sunday...west winds 15 to 20 knots becoming south. waves 3 to
5 feet. 

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 pm edt tue oct 13 2026


slz022-024-140300-
saint lawrence river from cape vincent to saint regis
403 pm edt tue oct 13 2026

.tonight...northeast winds 5 to 10 knots becoming west. showers
with a chance of thunderstorms this evening, then a chance of
showers after midnight. 
.wednesday...west winds 5 to 10 knots. mostly cloudy. 
.wednesday night...northwest winds 5 to 10 knots becoming north.
mostly cloudy. 
.thursday...north winds 10 knots or less becoming northeast.
mostly sunny. 
.thursday night...northeast winds 10 knots or less becoming east.
rain showers overnight. 
.friday...southeast winds 5 to 15 knots becoming northwest 15 to
20 knots. rain showers. 
.saturday...northwest winds 15 to 20 knots becoming southwest and
diminishing to less than 10 knots. partly cloudy. 
.sunday...southwest winds 5 to 15 knots becoming south. partly
cloudy. 

winds and waves higher in and near thunderstorms.

$$