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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
402 am edt thu aug 13 2026


slz022-024-131500-
saint lawrence river from cape vincent to saint regis
402 am edt thu aug 13 2026

.today...northwest winds 10 knots or less. patchy fog early. a
chance of showers and thunderstorms late. 
.tonight...northwest winds less than 10 knots. a chance of
showers and thunderstorms early. patchy fog after midnight. 
.friday...north winds less than 10 knots becoming northwest.
patchy fog in the morning. 
.friday night...northwest winds less than 10 knots. patchy fog
overnight. 
.saturday...north winds less than 10 knots. patchy fog during the
day. 
.sunday...southeast winds less than 10 knots becoming northwest.
showers likely with a chance of thunderstorms. 
.monday...northwest winds less than 10 knots. partly cloudy, then
becoming mainly clear. 

winds and waves higher in and near thunderstorms.

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt thu aug 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 trough averaging 29.7 inches lingers over the lake ontario region 
today. a high pressure ridge averaging 30.2 inches begins to build 
from the canadian prairies tonight before settling over lake ontario 
and vicinity by this saturday. the ridge begins to exit eastward 
saturday night through sunday morning and allows a warm front to 
sweep northeastward across lake ontario as a low of 29.7 inches 
moves eastward across the northern great lakes. this low should move 
generally east-southeastward from near the northern great lakes to 
near the gulf of maine later sunday through this monday. the low 
track should allow a cold front to sweep eastward across lake 
ontario sunday evening through sunday night. behind the cold front, 
a high pressure ridge averaging 30.0 inches should attempt to build 
from the upper midwest through monday.


loz063>065-131500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt thu aug 13 2026

.today...west winds 5 to 10 knots. waves 1 foot or less. 
.tonight...west winds 10 knots or less becoming north. waves
1 foot or less. 
.friday...northeast winds 10 knots or less. waves 1 foot or less.
.friday night...northeast winds 10 knots or less. waves 1 foot or
less. 
.saturday...northeast winds 10 knots or less becoming southeast.
a chance of showers saturday night. waves 1 foot or less. 
.sunday...south winds 5 to 15 knots becoming northwest. showers
likely with a chance of thunderstorms. waves 1 foot or less. 
.monday...north winds 5 to 15 knots. waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$