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

Current Water Temperature

65.7°F

Measurement Time: Monday, July 13, 2026, 3:24 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

63°F
Clear
Clear
63°F
62.1°F
94%
SSW 5.4 mph
11.3 mph
62.1°F
56.7°F
0 in
0%
6 mi
1021 mbar
0

Five Day Weather Forecast

Sunny
Mon
H: 88°F
L: 60°F
Sunny
Tue
H: 86°F
L: 70°F
Sunny
Wed
H: 83°F
L: 69°F
Sunny
Thu
H: 77°F
L: 59°F
Sunny
Fri
H: 72°F
L: 56°F

Air Quality

AQI: 1 - Good
PM2.5: 1.7 μg/m3
PM10: 1.7 μg/m3
Carbon Monoxide: 136 μg/m3
Nitrogen Dioxide: 9.6 μg/m3
Sulphur Dioxide: 0.8 μg/m3
Ozone: 61 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 1:09 PM
Sunset: 8:47 PM
Daylight: 15 hrs 15 mins
Moonrise: 4:04 AM
Moon Transit: 12:27 AM
Moonset: 8:42 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

1:21 AM - 3:51 AM
11:57 AM - 2:27 PM

Minor Periods

8:12 PM - 9:42 PM
3:34 AM - 5:04 AM

Action Rating: 4 out of 5

yellow warning - air quality - in effect

Effective: Sun July 12, 2026, 11:15 AM
Expires: Mon July 13, 2026, 12:59 AM

Smoke is causing or expected to cause poor air quality and reduced visibility. Smoke from forest fires in Quebec will continue to affect the regions through today. ### As smoke levels increase, health risks increase. Limit time outdoors. Consider reducing or rescheduling outdoor sports, activities and events. You may experience mild and common symptoms such as eye, nose and throat irritation, headaches or a mild cough. More serious but less common symptoms include wheezing, chest pains or severe cough. If you think you are having a medical emergency, seek immediate medical assistance. People more likely to be impacted by wildfire smoke, including people aged 65 and older, pregnant people, infants and young children, people with an existing illness or chronic health condition, and people who work outdoors, should reduce or reschedule strenuous activities outdoors and seek medical attention if experiencing symptoms. For further information visit the website https://www.airqualityontario.com/ or contact the Ontario Ministry of the Environment, Conservation and Parks at 416-314-6666. Visit http://www.airhealth.ca for information on how to reduce your health risk and your personal contribution to pollution levels, as well as for current and forecast AQHI values. Please continue to monitor alerts and forecasts issued by Environment Canada.

When indoors, keep windows and doors closed as much as possible. When there is an extreme heat event occurring with poor air quality, prioritize keeping cool. Protect your indoor air from wildfire smoke. Actions can include using the highest quality air filter that your ventilation system can handle and/or a certified portable air cleaner that can filter fine particles. If you must spend time outdoors, a well-constructed, well-fitting and properly worn respirator type mask (such as a NIOSH-certified N95 or equivalent respirator) can reduce your exposure to the fine particles in the smoke. Even though exposure may be reduced, there can still be risks to health. Check in on others who are in your care or live nearby who may be more likely to be impacted by wildfire smoke. Always follow guidance from local authorities. Learn more at https://www.canada.ca/wildfire-smoke.


yellow warning - air quality - in effect

Effective: Sun July 12, 2026, 11:15 AM
Expires: Mon July 13, 2026, 12:59 AM

Smoke is causing or expected to cause poor air quality and reduced visibility. ### As smoke levels increase, health risks increase. Limit time outdoors. Consider reducing or rescheduling outdoor sports, activities and events. You may experience mild and common symptoms such as eye, nose and throat irritation, headaches or a mild cough. More serious but less common symptoms include wheezing, chest pains or severe cough. If you think you are having a medical emergency, seek immediate medical assistance. People more likely to be impacted by wildfire smoke, including people aged 65 and older, pregnant people, infants and young children, people with an existing illness or chronic health condition, and people who work outdoors, should reduce or reschedule strenuous activities outdoors and seek medical attention if experiencing symptoms. For further information visit the website https://www.airqualityontario.com/ or contact the Ontario Ministry of the Environment, Conservation and Parks at 416-314-6666. Visit http://www.airhealth.ca for information on how to reduce your health risk and your personal contribution to pollution levels, as well as for current and forecast AQHI values. Please continue to monitor alerts and forecasts issued by Environment Canada.

When indoors, keep windows and doors closed as much as possible. When there is an extreme heat event occurring with poor air quality, prioritize keeping cool. Protect your indoor air from wildfire smoke. Actions can include using the highest quality air filter that your ventilation system can handle and/or a certified portable air cleaner that can filter fine particles. If you must spend time outdoors, a well-constructed, well-fitting and properly worn respirator type mask (such as a NIOSH-certified N95 or equivalent respirator) can reduce your exposure to the fine particles in the smoke. Even though exposure may be reduced, there can still be risks to health. Check in on others who are in your care or live nearby who may be more likely to be impacted by wildfire smoke. Always follow guidance from local authorities. Learn more at https://www.canada.ca/wildfire-smoke.


yellow warning - air quality - in effect

Effective: Sun July 12, 2026, 11:17 AM
Expires: Mon July 13, 2026, 3:17 AM

Smoke is causing or expected to cause poor air quality and reduced visibility. Smoke from forest fires in Quebec will continue to affect the regions through today. ### As smoke levels increase, health risks increase. Limit time outdoors. Consider reducing or rescheduling outdoor sports, activities and events. You may experience mild and common symptoms such as eye, nose and throat irritation, headaches or a mild cough. More serious but less common symptoms include wheezing, chest pains or severe cough. If you think you are having a medical emergency, seek immediate medical assistance. People more likely to be impacted by wildfire smoke, including people aged 65 and older, pregnant people, infants and young children, people with an existing illness or chronic health condition, and people who work outdoors, should reduce or reschedule strenuous activities outdoors and seek medical attention if experiencing symptoms. For further information visit the website https://www.airqualityontario.com/ or contact the Ontario Ministry of the Environment, Conservation and Parks at 416-314-6666. Visit http://www.airhealth.ca for information on how to reduce your health risk and your personal contribution to pollution levels, as well as for current and forecast AQHI values. Please continue to monitor alerts and forecasts issued by Environment Canada.

When indoors, keep windows and doors closed as much as possible. When there is an extreme heat event occurring with poor air quality, prioritize keeping cool. Protect your indoor air from wildfire smoke. Actions can include using the highest quality air filter that your ventilation system can handle and/or a certified portable air cleaner that can filter fine particles. If you must spend time outdoors, a well-constructed, well-fitting and properly worn respirator type mask (such as a NIOSH-certified N95 or equivalent respirator) can reduce your exposure to the fine particles in the smoke. Even though exposure may be reduced, there can still be risks to health. Check in on others who are in your care or live nearby who may be more likely to be impacted by wildfire smoke. Always follow guidance from local authorities. Learn more at https://www.canada.ca/wildfire-smoke.


yellow warning - air quality - in effect

Effective: Sun July 12, 2026, 11:17 AM
Expires: Mon July 13, 2026, 3:17 AM

Smoke is causing or expected to cause poor air quality and reduced visibility. ### As smoke levels increase, health risks increase. Limit time outdoors. Consider reducing or rescheduling outdoor sports, activities and events. You may experience mild and common symptoms such as eye, nose and throat irritation, headaches or a mild cough. More serious but less common symptoms include wheezing, chest pains or severe cough. If you think you are having a medical emergency, seek immediate medical assistance. People more likely to be impacted by wildfire smoke, including people aged 65 and older, pregnant people, infants and young children, people with an existing illness or chronic health condition, and people who work outdoors, should reduce or reschedule strenuous activities outdoors and seek medical attention if experiencing symptoms. For further information visit the website https://www.airqualityontario.com/ or contact the Ontario Ministry of the Environment, Conservation and Parks at 416-314-6666. Visit http://www.airhealth.ca for information on how to reduce your health risk and your personal contribution to pollution levels, as well as for current and forecast AQHI values. Please continue to monitor alerts and forecasts issued by Environment Canada.

When indoors, keep windows and doors closed as much as possible. When there is an extreme heat event occurring with poor air quality, prioritize keeping cool. Protect your indoor air from wildfire smoke. Actions can include using the highest quality air filter that your ventilation system can handle and/or a certified portable air cleaner that can filter fine particles. If you must spend time outdoors, a well-constructed, well-fitting and properly worn respirator type mask (such as a NIOSH-certified N95 or equivalent respirator) can reduce your exposure to the fine particles in the smoke. Even though exposure may be reduced, there can still be risks to health. Check in on others who are in your care or live nearby who may be more likely to be impacted by wildfire smoke. Always follow guidance from local authorities. Learn more at https://www.canada.ca/wildfire-smoke.


Monday, July 13, 2026

Weather Forecast

Sunny
88°F
60.4°F
72.5°F
67%
0 in
5%
0%
15.2 mph
8.1


Air Quality

AQI: 1 - Good
PM2.5: 3.18 μg/m3
PM10: 3.26 μg/m3
Carbon Monoxide: 125.75 μg/m3
Nitrogen Dioxide: 4.81 μg/m3
Sulphur Dioxide: 0.98 μg/m3
Ozone: 95.67 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 1:09 PM
Sunset: 8:47 PM
Daylight: 15 hrs 15 mins
Moonrise: 4:04 AM
Moon Transit: 12:27 AM
Moonset: 8:42 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

1:21 AM - 3:51 AM
11:57 AM - 2:27 PM

Minor Periods

8:12 PM - 9:42 PM
3:34 AM - 5:04 AM

Action Rating: 4 out of 5

Tuesday, July 14, 2026

Weather Forecast

Sunny
85.6°F
70°F
77.6°F
74%
0.02 in
36%
0%
20.4 mph
7.5


Air Quality

AQI: 1 - Good
PM2.5: 6.63 μg/m3
PM10: 6.75 μg/m3
Carbon Monoxide: 160.71 μg/m3
Nitrogen Dioxide: 4.95 μg/m3
Sulphur Dioxide: 2.06 μg/m3
Ozone: 125.29 μg/m3

Astronomical

Sunrise: 5:33 AM
Sun Transit: 1:09 PM
Sunset: 8:46 PM
Daylight: 15 hrs 13 mins
Moonrise: 5:24 AM
Moon Transit: 1:31 PM
Moonset: 9:23 PM
Moon Phase: New
Moon Illumination: 1.9%

Best Times for Fishing or Hunting

Major Periods

2:27 AM - 4:57 AM
1:01 PM - 3:31 PM

Minor Periods

8:53 PM - 10:23 PM
4:54 AM - 6:24 AM

Action Rating: 4 out of 5

Wednesday, July 15, 2026

Weather Forecast

Sunny
83°F
69.1°F
74.9°F
66%
0.06 in
57%
0%
19.5 mph
8.1


Air Quality

AQI: 1 - Good
PM2.5: 4.09 μg/m3
PM10: 4.17 μg/m3
Carbon Monoxide: 145.75 μg/m3
Nitrogen Dioxide: 3 μg/m3
Sulphur Dioxide: 0.41 μg/m3
Ozone: 89.33 μg/m3

Astronomical

Sunrise: 5:34 AM
Sun Transit: 1:09 PM
Sunset: 8:45 PM
Daylight: 15 hrs 12 mins
Moonrise: 6:48 AM
Moon Transit: 2:29 PM
Moonset: 9:55 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

3:28 AM - 5:58 AM
1:59 PM - 4:29 PM

Minor Periods

9:25 PM - 10:55 PM
6:18 AM - 7:48 AM

Action Rating: 4 out of 5

Thursday, July 16, 2026

Weather Forecast

Sunny
76.9°F
59.4°F
69.5°F
56%
0.01 in
17%
0%
17.2 mph
6.9


Air Quality

AQI: 1 - Good
PM2.5: 3.72 μg/m3
PM10: 3.8 μg/m3
Carbon Monoxide: 117.42 μg/m3
Nitrogen Dioxide: 3.03 μg/m3
Sulphur Dioxide: 0.36 μg/m3
Ozone: 73.13 μg/m3

Astronomical

Sunrise: 5:35 AM
Sun Transit: 1:09 PM
Sunset: 8:45 PM
Daylight: 15 hrs 10 mins
Moonrise: 8:10 AM
Moon Transit: 3:23 PM
Moonset: 10:20 PM
Moon Phase: New
Moon Illumination: 2.4%

Best Times for Fishing or Hunting

Major Periods

4:23 AM - 6:53 AM
2:53 PM - 5:23 PM

Minor Periods

9:50 PM - 11:20 PM
7:40 AM - 9:10 AM

Action Rating: 3 out of 5

Friday, July 17, 2026

Weather Forecast

Sunny
72.3°F
56.2°F
64°F
65%
0 in
6%
0%
10.5 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 2.02 μg/m3
PM10: 2.1 μg/m3
Carbon Monoxide: 130.22 μg/m3
Nitrogen Dioxide: 4.4 μg/m3
Sulphur Dioxide: 0.71 μg/m3
Ozone: 53.56 μg/m3

Astronomical

Sunrise: 5:35 AM
Sun Transit: 1:09 PM
Sunset: 8:44 PM
Daylight: 15 hrs 9 mins
Moonrise: 9:28 AM
Moon Transit: 4:11 PM
Moonset: 10:41 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.0%

Best Times for Fishing or Hunting

Major Periods

5:14 AM - 7:44 AM
3:41 PM - 6:11 PM

Minor Periods

10:11 PM - 11:41 PM
8:58 AM - 10:28 AM

Action Rating: 3 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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