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forecast for the saint lawrence river
including the thousand islands region
national weather service buffalo ny
403 am edt sat may 9 2026


slz022-024-091500-
saint lawrence river from cape vincent to saint regis
403 am edt sat may 9 2026

.today...south winds 5 to 10 knots. mostly sunny. 
.tonight...south winds 5 to 15 knots becoming southwest. showers.
a chance of showers late. 
.sunday...southwest winds 5 to 15 knots. mostly sunny. 
.sunday night...southwest winds 5 to 15 knots becoming west less
than 10 knots. partly cloudy in the evening, then becoming mainly
clear. 
.monday...west winds less than 10 knots. a chance of rain
showers. 
.tuesday...northwest winds less than 10 knots. mainly clear, then
becoming partly cloudy. 
.wednesday...southeast winds 5 to 10 knots. a chance of rain
showers. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sat may 9 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 30.1 inch high will drift off the mid atlantic coast 
through tonight. a weak 29.5 inch low will then move from the upper 
great lakes saturday to western quebec by early sunday before moving 
to northern quebec early monday. meanwhile, a trailing cold front 
will cross the lake sunday night. a 30.4 inch high will then build 
from the upper great lakes monday to the lower great lakes by 
tuesday.


loz062-091500-
lake ontario open waters from the niagara river to hamlin beach-
402 am edt sat may 9 2026

.today...southeast winds 10 knots or less increasing to 10 to
15 knots. waves 2 feet or less. 
.tonight...southwest winds 15 to 20 knots becoming west 10 to
15 knots. a chance of showers in the evening. waves 1 to 3 feet. 
.sunday...west winds around 10 knots. waves 1 to 2 feet. 
.sunday night...west winds 5 to 10 knots becoming northwest.
waves 1 to 2 feet. 
.monday...west winds 5 to 10 knots becoming northwest. waves
2 feet or less. 
.tuesday...west winds 5 to 15 knots becoming southeast. rain
showers likely tuesday night. waves 2 feet or less. 
.wednesday...southeast winds 15 to 20 knots becoming north 10 to
15 knots. showers likely during the day, then a chance of showers
wednesday night. waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 

$$

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open lake forecast for lake ontario
national weather service buffalo ny
402 am edt sat may 9 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 30.1 inch high will drift off the mid atlantic coast 
through tonight. a weak 29.5 inch low will then move from the upper 
great lakes saturday to western quebec by early sunday before moving 
to northern quebec early monday. meanwhile, a trailing cold front 
will cross the lake sunday night. a 30.4 inch high will then build 
from the upper great lakes monday to the lower great lakes by 
tuesday.


loz063>065-091500-
lake ontario open waters from hamlin beach to the saint lawrence
river-
402 am edt sat may 9 2026

.today...southeast winds 5 to 15 knots. waves 2 feet or less. 
.tonight...south winds 10 to 15 knots becoming west. a chance of
showers early, then showers late in the evening. a chance of
showers after midnight. waves 1 to 3 feet. 
.sunday...west winds 10 to 15 knots increasing to 15 to 20 knots.
waves 1 to 3 feet building to 2 to 4 feet. 
.sunday night...west winds 5 to 15 knots. waves 1 to 3 feet. 
.monday...west winds 5 to 15 knots becoming northwest. waves 1 to
3 feet. 
.tuesday...northwest winds 5 to 15 knots becoming southeast. a
chance of rain showers tuesday night. waves 2 feet or less. 
.wednesday...southeast winds 10 to 15 knots. showers likely.
waves 1 to 3 feet. 

$$

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open lake forecast for lake erie
national weather service cleveland oh
400 am edt sat may 9 2026

for waters beyond five nautical miles of shore on lake erie

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...
mean sea level pressure wavers around 29.80 inches through this 
afternoon as subtle trough axes move eastward across lake erie. a 
cold front is expected to sweep southeastward across the lake 
this evening through tonight. behind the front, a ridge averaging
30.10 inches should affect lake erie as the embedded high 
pressure center moves from the canadian prairies to atlantic 
waters near north carolina on sunday through tuesday. the ridge 
exits generally eastward tuesday night through wednesday as a low 
of 29.70 inches wobbles east-southeastward from the northwestern 
great lakes toward lake ontario. this should allow a warm front to
sweep northward across lake erie tuesday night through wednesday 
morning and a cold front to sweep eastward across the lake later 
on wednesday. 


lez061-168-169-091430-
ripley to buffalo ny extending from 5nm off shoreline to us-
canadian border-geneva-on-the-
lake to conneaut oh beyond 5 nm off shoreline to us-
canadian border-
conneaut oh to ripley ny beyond 5 nm off shoreline to us-
canadian border-
400 am edt sat may 9 2026

.today...south winds 5 to 10 knots becoming southwest. a chance
of showers and thunderstorms late. waves 2 feet or less. 
.tonight...southwest winds 5 to 15 knots becoming northwest.
showers and thunderstorms likely early, then a slight chance of
showers and thunderstorms late in the evening. waves 1 to 3 feet.
.sunday...northwest winds 5 to 10 knots becoming southwest. waves
2 feet or less. 
.sunday night...west winds 10 knots or less becoming north. waves
1 foot or less. 
.monday...north winds 5 to 10 knots. waves 2 feet or less. 
.tuesday...northwest winds 10 knots or less becoming south and
increasing to 15 to 20 knots. rain showers tuesday night. waves
2 feet or less. 
.wednesday...south winds 15 to 20 knots becoming northwest 5 to
15 knots. showers likely during the day, then a chance of showers
wednesday night. waves 1 to 3 feet. 

winds and waves higher in and near thunderstorms.

$$