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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 27 2026


slz022-024-271500-
saint lawrence river from cape vincent to saint regis
403 am edt mon jul 27 2026

.today...southwest winds 10 knots or less. scattered showers and
thunderstorms this afternoon. 
.tonight...southwest winds less than 10 knots. a chance of
showers and thunderstorms late. 
.tuesday...southeast winds less than 10 knots becoming east.
showers with a chance of thunderstorms. 
.tuesday night...northeast winds 5 to 15 knots. showers with a
chance of thunderstorms in the evening, then showers overnight. 
.wednesday...northeast winds 5 to 15 knots becoming north.
showers with a chance of thunderstorms. 
.thursday...north winds 5 to 10 knots becoming light and
variable. a chance of showers and thunderstorms. 
.friday...light and variable winds. mainly clear, then becoming
partly cloudy. 

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 mon jul 27 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 29.6 inch low over the western great lakes this 
morning will strengthen to 29.3 inches while moving southeast into 
the lower great lakes tonight and tuesday. a cold front associated 
with this low will swing across the lake late tuesday and tuesday 
night. the low will then weaken to 29.6 inches while drifting east 
into new england by wednesday, before entering the northern atlantic 
thursday and friday. meanwhile a 30.0 inch high will slide across 
the great lakes thursday and friday.


loz063>065-271500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt mon jul 27 2026

.today...southwest winds 5 to 10 knots becoming northeast. waves
1 foot or less. 
.tonight...southeast winds 10 knots or less becoming south 10 to
15 knots. a chance of showers and thunderstorms after midnight.
showers likely with a chance of thunderstorms late. waves 2 feet
or less. 
.tuesday...southeast winds 10 to 15 knots becoming east. showers
with a chance of thunderstorms. waves 2 feet or less. 
.tuesday night...northeast winds 15 to 20 knots becoming north.
showers with a chance of thunderstorms in the evening, then
showers overnight. waves 1 to 3 feet building to 3 to 5 feet. 
.wednesday...northeast winds 15 to 20 knots becoming north.
showers. waves 3 to 5 feet subsiding to 2 to 4 feet. 
.thursday...north winds 15 to 20 knots becoming northwest 5 to
15 knots. waves 2 to 4 feet subsiding to 1 foot or less. 
.friday...northwest winds 10 knots or less becoming southwest.
waves 1 foot or less. 

winds and waves higher in and near thunderstorms.

$$