Water Temperature of the St. Lawrence River in Wellesley Island, NY

Current Water Temperature

72.0°F

Measurement Time: Monday, August 3, 2026, 7:30 AM EDT

Temperature Locations

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Local Points of Interest

Coast Guard Station Alexandria Bay; Keewaydin State Park

St. Lawrence River

Station Name: Alexandria Bay
Data Source: NOAA Tides and Currents

Elevation Above Sea Level: 240 feet

Sensor Depth: -2 feet

Nearest Address:
45898 Hopewell Hall Rd
Wellesley Island, NY 13640
Jefferson County

GPS Coordinates: 44.331110, -75.934528

Nearby Water Temperatures

St. Lawrence River, Ogdensburg, NY (33.6 mi)
Independence River, Donnattsburg, NY (50.2 mi)
Oswego River, Oswego, NY (67.1 mi)
Buck Creek, Inlet, NY (72.6 mi)
Lake Ontario, Rochester, NY (87.9 mi)
Skaneateles Lake, Skaneateles, NY (98.9 mi)
Irondequoit Creek, Penfield, NY (113.6 mi)
Allen Creek, Brighton, NY (115 mi)
Northrup Creek, North Greece, NY (116.9 mi)
Genesee River, Rochester, NY (117.5 mi)
Erie Canal, Rochester, NY (119.5 mi)
Sandy Creek, North Hamlin, NY (120.2 mi)
Mohawk River, Fonda, NY (123.3 mi)
Lake Champlain, Port Henry, NY (124.4 mi)
Schoharie Creek, Fort Hunter, NY (126.9 mi)

Weather for Wellesley Island, New York

Current Weather

70.9°F
Patchy rain nearby
Patchy rain nearby
70°F
75.8°F
93%
SSW 14.3 mph
21.7 mph
70.9°F
68.8°F
0.01 in
100%
6 mi
1003 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Mon
H: 76°F
L: 62°F
Sunny
Tue
H: 76°F
L: 62°F
Sunny
Wed
H: 80°F
L: 64°F
Patchy rain nearby
Thu
H: 83°F
L: 68°F
Sunny
Fri
H: 78°F
L: 67°F

Air Quality

AQI: 1 - Good
PM2.5: 1.5 μg/m3
PM10: 1.5 μg/m3
Carbon Monoxide: 120 μg/m3
Nitrogen Dioxide: 2.2 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 61 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:09 PM
Sunset: 8:26 PM
Daylight: 14 hrs 33 mins
Moonrise: 10:29 PM
Moon Transit: 12:00 AM
Moonset: 11:14 AM
Moon Phase: Waning Gibbous
Moon Illumination: 65.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

9:59 PM - 11:29 PM
10:44 AM - 12:14 AM

Action Rating: 2 out of 5

squall watch in effect

Effective: Sun August 2, 2026, 6:42 PM
Expires: Mon August 3, 2026, 4:03 AM

Conditions are favourable for the development of squalls with wind gusts possibly exceeding 35 knots, frequent lightning and poor to very poor visibility in torrential downpours. Numerous showers and thunderstorms are possible for the St. Lawrence River as well as Lake Ontario. The threat should diminish later tonight. ### Poor to very poor visibility may contribute to voyage delays and make marine navigation hazardous. Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Consider delaying or postponing travel in areas under the Squall Watch.


squall watch in effect

Effective: Sun August 2, 2026, 6:13 PM
Expires: Mon August 3, 2026, 4:04 AM

Conditions are favourable for the development of squalls with wind gusts possibly exceeding 35 knots, frequent lightning and poor to very poor visibility in torrential downpours. Numerous showers and thunderstorms are possible for the St. Lawrence River as well as eastern Lake Ontario. The threat should diminish later tonight. ### Poor to very poor visibility may contribute to voyage delays and make marine navigation hazardous. Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.

Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway. Consider delaying or postponing travel in areas under the Squall Watch.
Monday, August 3, 2026

Weather Forecast

Patchy rain nearby
75.6°F
62.3°F
69.3°F
83%
0.05 in
61%
0%
24.6 mph
6.7


Air Quality

AQI: 1 - Good
PM2.5: 2.6 μg/m3
PM10: 2.74 μg/m3
Carbon Monoxide: 120.67 μg/m3
Nitrogen Dioxide: 2.25 μg/m3
Sulphur Dioxide: 0.44 μg/m3
Ozone: 64.42 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:09 PM
Sunset: 8:26 PM
Daylight: 14 hrs 33 mins
Moonrise: 10:29 PM
Moon Transit: 12:00 AM
Moonset: 11:14 AM
Moon Phase: Waning Gibbous
Moon Illumination: 65.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

9:59 PM - 11:29 PM
10:44 AM - 12:14 AM

Action Rating: 2 out of 5

Tuesday, August 4, 2026

Weather Forecast

Sunny
76.4°F
61.9°F
68.7°F
71%
0 in
6%
0%
9.6 mph
8.2


Air Quality

AQI: 1 - Good
PM2.5: 3.41 μg/m3
PM10: 3.51 μg/m3
Carbon Monoxide: 134.75 μg/m3
Nitrogen Dioxide: 3.67 μg/m3
Sulphur Dioxide: 0.52 μg/m3
Ozone: 61.75 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 1:09 PM
Sunset: 8:25 PM
Daylight: 14 hrs 30 mins
Moonrise: 10:51 PM
Moon Transit: 5:20 AM
Moonset: 12:27 AM
Moon Phase: Last Quarter
Moon Illumination: 54.6%

Best Times for Fishing or Hunting

Major Periods

4:50 AM - 7:20 AM
7:10 PM - 9:40 PM

Minor Periods

10:21 PM - 11:51 PM
11:57 AM - 1:27 PM

Action Rating: 2 out of 5

Wednesday, August 5, 2026

Weather Forecast

Sunny
80.2°F
63.7°F
71.6°F
70%
0 in
7%
0%
7.8 mph
7.9


Air Quality

AQI: 1 - Good
PM2.5: 6.6 μg/m3
PM10: 6.72 μg/m3
Carbon Monoxide: 146.88 μg/m3
Nitrogen Dioxide: 5 μg/m3
Sulphur Dioxide: 0.76 μg/m3
Ozone: 78.71 μg/m3

Astronomical

Sunrise: 5:56 AM
Sun Transit: 1:09 PM
Sunset: 8:23 PM
Daylight: 14 hrs 28 mins
Moonrise: 11:18 PM
Moon Transit: 6:09 AM
Moonset: 1:43 PM
Moon Phase: Last Quarter
Moon Illumination: 43.2%

Best Times for Fishing or Hunting

Major Periods

5:39 AM - 8:09 AM
8:02 PM - 10:32 PM

Minor Periods

12:00 AM - 12:00 AM
1:13 PM - 2:43 PM

Action Rating: 4 out of 5

Thursday, August 6, 2026

Weather Forecast

Patchy rain nearby
83°F
68.4°F
74.7°F
84%
0.19 in
76%
0%
14.1 mph
8.3


Air Quality

AQI: 1 - Good
PM2.5: 6.36 μg/m3
PM10: 6.47 μg/m3
Carbon Monoxide: 152.44 μg/m3
Nitrogen Dioxide: 4.78 μg/m3
Sulphur Dioxide: 0.76 μg/m3
Ozone: 77.92 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 1:09 PM
Sunset: 8:22 PM
Daylight: 14 hrs 25 mins
Moonrise: 12:18 AM
Moon Transit: 7:02 AM
Moonset: 3:01 PM
Moon Phase: Last Quarter
Moon Illumination: 32.3%

Best Times for Fishing or Hunting

Major Periods

6:32 AM - 9:02 AM
8:58 PM - 11:28 PM

Minor Periods

2:31 PM - 4:01 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Friday, August 7, 2026

Weather Forecast

Sunny
78.1°F
66.7°F
71.7°F
78%
0.1 in
60%
0%
8.9 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 3.02 μg/m3
PM10: 3.02 μg/m3
Carbon Monoxide: 243.67 μg/m3
Nitrogen Dioxide: 3.19 μg/m3
Sulphur Dioxide: 0.71 μg/m3
Ozone: 71.11 μg/m3

Astronomical

Sunrise: 5:58 AM
Sun Transit: 1:09 PM
Sunset: 8:21 PM
Daylight: 14 hrs 23 mins
Moonrise: 12:54 AM
Moon Transit: 8:01 AM
Moonset: 4:19 PM
Moon Phase: Last Quarter
Moon Illumination: 22.2%

Best Times for Fishing or Hunting

Major Periods

7:31 AM - 10:01 AM
12:00 AM - 12:00 AM

Minor Periods

3:49 PM - 5:19 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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