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glfsl 
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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 pm edt sat sep 19 2026


slz022-024-200300-
saint lawrence river from cape vincent to saint regis
403 pm edt sat sep 19 2026

.tonight...northeast winds less than 10 knots. a chance of
showers late. 
.sunday...east winds 10 knots or less becoming northeast. showers
through early afternoon. 
.sunday night...northeast winds 10 knots or less becoming north
10 to 15 knots. partly cloudy. 
.monday...north winds 5 to 15 knots becoming northeast. partly
sunny. 
.monday night...northeast winds 5 to 10 knots. mostly cloudy. 
.tuesday...northeast winds 5 to 10 knots. becoming mainly clear. 
.wednesday...northeast winds 10 knots or less becoming east.
mainly clear, then becoming partly cloudy. 
.thursday...northeast winds 10 knots or less. partly to mostly
cloudy. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sat sep 19 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 ridge of high pressure averaging 30.4 inches 
over the lake will slowly drift to the east through tonight and 
sunday, before drifting off the new england coast sunday night. this 
will open the door for a cold front to sweep southward across the 
lake sunday night, with a ridge averaging 30.4 inches building in 
from northern ontario through monday. by monday night through 
tuesday, a low of 30.0 inches should move from near the lower ohio 
valley toward the mid-atlantic states and extend a weak trough 
averaging 30.3 inches over the eastern great lakes. meanwhile, a 
strong 30.6 inch high over quebec tuesday will then ridge south 
across the lake from tuesday night through at least thursday.


loz062-200300-
lake ontario open waters from the niagara river to hamlin beach-
402 pm edt sat sep 19 2026

.tonight...east winds 15 to 20 knots diminishing to 10 to
15 knots. a chance of showers after midnight. waves 2 to 4 feet
subsiding to 1 to 2 feet. 
.sunday...east winds 10 to 15 knots becoming northeast. a chance
of showers in the morning. waves 1 to 3 feet building to 2 to
4 feet. 
.sunday night...northeast winds 10 to 15 knots increasing to
15 to 25 knots. waves 1 to 3 feet building to 3 to 6 feet. 
.monday...northeast winds 15 to 20 knots. waves 3 to 6 feet
subsiding to 2 to 4 feet. 
.monday night...northeast winds 15 to 25 knots. waves 2 to 4 feet
building to 5 to 7 feet. waves occasionally around 9 feet. 
.tuesday...northeast winds 15 to 25 knots becoming east. waves
5 to 8 feet. waves occasionally around 10 feet. 
.wednesday...east winds 15 to 25 knots. waves 4 to 7 feet
subsiding to 3 to 5 feet. waves occasionally around 9 feet. 
.thursday...east winds 15 to 20 knots diminishing to around
10 knots. waves 2 to 4 feet. 

$$

fzus61 kbuf 192002
glflo 
expires:202609200300;;726354

open lake forecast for lake ontario
national weather service buffalo ny
402 pm edt sat sep 19 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 ridge of high pressure averaging 30.4 inches 
over the lake will slowly drift to the east through tonight and 
sunday, before drifting off the new england coast sunday night. this 
will open the door for a cold front to sweep southward across the 
lake sunday night, with a ridge averaging 30.4 inches building in 
from northern ontario through monday. by monday night through 
tuesday, a low of 30.0 inches should move from near the lower ohio 
valley toward the mid-atlantic states and extend a weak trough 
averaging 30.3 inches over the eastern great lakes. meanwhile, a 
strong 30.6 inch high over quebec tuesday will then ridge south 
across the lake from tuesday night through at least thursday.


loz063>065-200300-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 pm edt sat sep 19 2026

.tonight...northeast winds 5 to 15 knots becoming southeast.
showers late. waves 2 feet or less. 
.sunday...southeast winds 10 to 15 knots becoming northeast 15 to
20 knots. showers in the morning, then a chance of showers early
in the afternoon. waves 2 feet or less building to 2 to 4 feet. 
.sunday night...northeast winds 15 to 25 knots. waves 2 to 4 feet
building to 3 to 6 feet. 
.monday...northeast winds 15 to 25 knots. waves 4 to 7 feet
subsiding to 2 to 4 feet. waves occasionally around 9 feet. 
.monday night...northeast winds 15 to 20 knots becoming east.
waves 2 to 4 feet building to 3 to 6 feet. 
.tuesday...east winds 15 to 20 knots. waves 3 to 6 feet. 
.wednesday...east winds 15 to 20 knots. waves 3 to 5 feet
subsiding to 2 to 4 feet. 
.thursday...east winds 15 to 20 knots diminishing to 5 to
15 knots. waves 2 to 4 feet subsiding to 1 to 3 feet. 

$$