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

Current Water Temperature

47.8°F

Measurement Time: Sunday, May 10, 2026, 7:00 PM 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

54.3°F
Overcast
Overcast
49.9°F
52.9°F
47%
WSW 16.6 mph
26.5 mph
50.3°F
33.9°F
0 in
0%
6 mi
1016 mbar
0.3

Five Day Weather Forecast

Sunny
Sun
H: 60°F
L: 45°F
Patchy rain nearby
Mon
H: 49°F
L: 37°F
Sunny
Tue
H: 52°F
L: 34°F
Moderate rain
Wed
H: 52°F
L: 44°F
Patchy rain nearby
Thu
H: 50°F
L: 43°F

Air Quality

AQI: 1 - Good
PM2.5: 1.75 μg/m3
PM10: 1.85 μg/m3
Carbon Monoxide: 156.85 μg/m3
Nitrogen Dioxide: 5.15 μg/m3
Sulphur Dioxide: 1.15 μg/m3
Ozone: 63 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 1:00 PM
Sunset: 8:19 PM
Daylight: 14 hrs 37 mins
Moonrise: 2:38 AM
Moon Transit: 7:48 AM
Moonset: 1:08 PM
Moon Phase: Last Quarter
Moon Illumination: 26.2%

Best Times for Fishing or Hunting

Major Periods

7:18 AM - 9:48 AM
12:00 AM - 12:00 AM

Minor Periods

12:38 AM - 2:08 PM
2:08 AM - 3:38 AM

Action Rating: 2 out of 5

Frost Advisory issued May 10 at 12:33PM EDT until May 11 at 8:00AM EDT by NWS Buffalo NY

Effective: Sun May 10, 2026, 12:33 PM
Expires: Mon May 11, 2026, 8:00 AM

* WHAT...Temperatures in the lower to mid 30s will result in frost formation. * WHERE...Oswego, Jefferson, Lewis, Wyoming, Chautauqua, Cattaraugus, Allegany, and Southern Erie Counties. Greatest coverage of frost will be inland from the lake shoreline. * WHEN...From 11 PM this evening to 8 AM EDT Monday. * IMPACTS...Frost could kill sensitive outdoor vegetation if left unprotected.

Take steps now to protect tender plants from the cold.
Sunday, May 10, 2026

Weather Forecast

Sunny
59.7°F
45.1°F
51.4°F
66%
0 in
0%
0%
19.5 mph
6.2


Air Quality

AQI: 1 - Good
PM2.5: 6.68 μg/m3
PM10: 7.05 μg/m3
Carbon Monoxide: 154.21 μg/m3
Nitrogen Dioxide: 3.85 μg/m3
Sulphur Dioxide: 1.72 μg/m3
Ozone: 79.72 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 1:00 PM
Sunset: 8:19 PM
Daylight: 14 hrs 37 mins
Moonrise: 2:38 AM
Moon Transit: 7:48 AM
Moonset: 1:08 PM
Moon Phase: Last Quarter
Moon Illumination: 26.2%

Best Times for Fishing or Hunting

Major Periods

7:18 AM - 9:48 AM
12:00 AM - 12:00 AM

Minor Periods

12:38 AM - 2:08 PM
2:08 AM - 3:38 AM

Action Rating: 2 out of 5

Monday, May 11, 2026

Weather Forecast

Patchy rain nearby
48.8°F
36.9°F
43.3°F
70%
0.04 in
86%
0%
12.8 mph
5.4


Air Quality

AQI: 1 - Good
PM2.5: 1.79 μg/m3
PM10: 1.81 μg/m3
Carbon Monoxide: 140.89 μg/m3
Nitrogen Dioxide: 3.43 μg/m3
Sulphur Dioxide: 1.12 μg/m3
Ozone: 62.84 μg/m3

Astronomical

Sunrise: 5:41 AM
Sun Transit: 1:00 PM
Sunset: 8:20 PM
Daylight: 14 hrs 39 mins
Moonrise: 2:58 AM
Moon Transit: 8:32 AM
Moonset: 2:19 PM
Moon Phase: Last Quarter
Moon Illumination: 16.9%

Best Times for Fishing or Hunting

Major Periods

8:02 AM - 10:32 AM
12:00 AM - 12:00 AM

Minor Periods

1:49 PM - 3:19 PM
2:28 AM - 3:58 AM

Action Rating: 2 out of 5

Tuesday, May 12, 2026

Weather Forecast

Sunny
52°F
33.8°F
43.4°F
69%
0 in
0%
0%
12.8 mph
6.4


Air Quality

AQI: 1 - Good
PM2.5: 2.21 μg/m3
PM10: 2.25 μg/m3
Carbon Monoxide: 140.49 μg/m3
Nitrogen Dioxide: 4.46 μg/m3
Sulphur Dioxide: 1.2 μg/m3
Ozone: 56.44 μg/m3

Astronomical

Sunrise: 5:40 AM
Sun Transit: 1:00 PM
Sunset: 8:21 PM
Daylight: 14 hrs 41 mins
Moonrise: 3:17 AM
Moon Transit: 9:41 PM
Moonset: 3:30 PM
Moon Phase: Waning Crescent
Moon Illumination: 9.3%

Best Times for Fishing or Hunting

Major Periods

9:11 PM - 11:41 PM
9:11 PM - 11:41 PM

Minor Periods

3:00 PM - 4:30 PM
2:47 AM - 4:17 AM

Action Rating: 2 out of 5

Wednesday, May 13, 2026

Weather Forecast

Moderate rain
51.8°F
43.7°F
48.3°F
83%
0.39 in
84%
0%
20.8 mph
0.8


Air Quality

AQI: 1 - Good
PM2.5: 4.71 μg/m3
PM10: 4.87 μg/m3
Carbon Monoxide: 145.54 μg/m3
Nitrogen Dioxide: 4.14 μg/m3
Sulphur Dioxide: 1.82 μg/m3
Ozone: 66.64 μg/m3

Astronomical

Sunrise: 5:39 AM
Sun Transit: 1:00 PM
Sunset: 8:22 PM
Daylight: 14 hrs 44 mins
Moonrise: 3:37 AM
Moon Transit: 10:03 AM
Moonset: 4:46 PM
Moon Phase: Waning Crescent
Moon Illumination: 3.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:33 AM - 12:03 AM

Minor Periods

4:16 PM - 5:46 PM
3:07 AM - 4:37 AM

Action Rating: 2 out of 5

Thursday, May 14, 2026

Weather Forecast

Patchy rain nearby
49.6°F
43.2°F
46.8°F
86%
0.02 in
86%
0%
9.8 mph
4.3


Air Quality

AQI: 1 - Good
PM2.5: 8.59 μg/m3
PM10: 8.65 μg/m3
Carbon Monoxide: 192.71 μg/m3
Nitrogen Dioxide: 5.48 μg/m3
Sulphur Dioxide: 1.31 μg/m3
Ozone: 58.92 μg/m3

Astronomical

Sunrise: 5:38 AM
Sun Transit: 1:00 PM
Sunset: 8:23 PM
Daylight: 14 hrs 46 mins
Moonrise: 3:58 AM
Moon Transit: 10:53 AM
Moonset: 6:05 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
10:23 AM - 12:53 AM

Minor Periods

5:35 PM - 7:05 PM
3:28 AM - 4:58 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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