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

Current Water Temperature

44.8°F

Measurement Time: Wednesday, April 29, 2026, 3:48 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

57°F
Overcast
Overcast
56.7°F
54.3°F
74%
NNE 4.5 mph
7.8 mph
52.9°F
52.6°F
0.03 in
100%
9 mi
1009 mbar
0.2

Five Day Weather Forecast

Heavy rain
Wed
H: 55°F
L: 50°F
Moderate rain
Thu
H: 50°F
L: 44°F
Patchy rain nearby
Fri
H: 47°F
L: 36°F
Patchy rain nearby
Sat
H: 46°F
L: 38°F
Patchy rain nearby
Sun
H: 47°F
L: 35°F

Air Quality

AQI: 1 - Good
PM2.5: 10.75 μg/m3
PM10: 10.95 μg/m3
Carbon Monoxide: 194.85 μg/m3
Nitrogen Dioxide: 8.05 μg/m3
Sulphur Dioxide: 2.25 μg/m3
Ozone: 59 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 1:01 PM
Sunset: 8:06 PM
Daylight: 14 hrs 8 mins
Moonrise: 6:22 PM
Moon Transit: 11:47 PM
Moonset: 4:45 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 95.5%

Best Times for Fishing or Hunting

Major Periods

12:52 AM - 3:22 PM
12:00 AM - 12:00 AM

Minor Periods

5:52 PM - 7:22 PM
4:15 AM - 5:45 AM

Action Rating: 3 out of 5

yellow warning - rainfall - in effect

Service Notice – February 2026: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2026, changes are expected to include... 1) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard is tentatively set for Spring 2026 deployment. Data changes will appear in CAP following this deployment and 2) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – février 2026: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2026, il y aura des changements incluant... 1) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique devrait être déployée provisoirement au printemps 2026. Des changements de données apparaîtront dans le PAC à la suite de ce déploiement et 2) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/

Effective: Tue April 28, 2026, 10:26 PM
Expires: Wed April 29, 2026, 2:26 PM

Heavy rain is expected beginning late Wednesday. The ground, already near saturation, has little ability to absorb further rainfall. What: Rainfall amounts of 30 to 50 mm. When: Late Wednesday afternoon into Thursday morning. Additional information: A low pressure system will bring heavy, widespread rain beginning late Wednesday. ### Water will likely pool on roads and in low-lying areas. For information concerning flooding, please consult your local Conservation Authority or Ontario Ministry of Natural Resources office. Visit https://www.ontario.ca/page/floods for the latest details. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.

Don't drive through flooded roadways. Watch for washouts near rivers, creeks and culverts.


yellow warning - rainfall - in effect

Service Notice – February 2026: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2026, changes are expected to include... 1) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard is tentatively set for Spring 2026 deployment. Data changes will appear in CAP following this deployment and 2) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – février 2026: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2026, il y aura des changements incluant... 1) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique devrait être déployée provisoirement au printemps 2026. Des changements de données apparaîtront dans le PAC à la suite de ce déploiement et 2) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/

Effective: Wed April 29, 2026, 5:05 AM
Expires: Wed April 29, 2026, 9:05 PM

Heavy rain is expected. The ground, already near saturation, has little ability to absorb further rainfall. What: Rainfall amounts of 30 to 50 mm. When: Late this afternoon into Thursday morning. Additional information: A low pressure system will bring heavy, widespread rain beginning late this afternoon. ### Water will likely pool on roads and in low-lying areas. For information concerning flooding, please consult your local Conservation Authority or Ontario Ministry of Natural Resources office. Visit https://www.ontario.ca/page/floods for the latest details. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.

Don't drive through flooded roadways. Watch for washouts near rivers, creeks and culverts.


yellow warning - rainfall - in effect

Service Notice – February 2026: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For 2026, changes are expected to include... 1) ECCC's initiative to introduce free-form polygons to represent the true threat area of a weather hazard is tentatively set for Spring 2026 deployment. Data changes will appear in CAP following this deployment and 2) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – février 2026: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour 2026, il y aura des changements incluant... 1) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique devrait être déployée provisoirement au printemps 2026. Des changements de données apparaîtront dans le PAC à la suite de ce déploiement et 2) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/

Effective: Wed April 29, 2026, 11:03 AM
Expires: Thu April 30, 2026, 3:03 AM

Heavy rain is expected. The ground, already nearly saturated, will have a reduced ability to absorb more rain. What: From 30 to 50 millimetres of rain. When: Late this afternoon until Thursday morning. Additional information: A low pressure system will cause widespread heavy rain starting this afternoon. ### Water will likely pool on roads and in low-lying areas. For information concerning flooding, please consult your local Conservation Authority or Ontario Ministry of Natural Resources office. Visit https://www.ontario.ca/page/floods for the latest details. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.

Don't drive through flooded roadways. Watch for washouts near rivers, creeks and culverts.


Wednesday, April 29, 2026

Weather Forecast

Heavy rain
55.4°F
49.5°F
53.4°F
88%
1.09 in
88%
0%
15.7 mph
2.3


Air Quality

AQI: 1 - Good
PM2.5: 10.13 μg/m3
PM10: 10.48 μg/m3
Carbon Monoxide: 169.49 μg/m3
Nitrogen Dioxide: 5.87 μg/m3
Sulphur Dioxide: 2.49 μg/m3
Ozone: 64.72 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 1:01 PM
Sunset: 8:06 PM
Daylight: 14 hrs 8 mins
Moonrise: 6:22 PM
Moon Transit: 11:47 PM
Moonset: 4:45 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 95.5%

Best Times for Fishing or Hunting

Major Periods

12:52 AM - 3:22 PM
12:00 AM - 12:00 AM

Minor Periods

5:52 PM - 7:22 PM
4:15 AM - 5:45 AM

Action Rating: 3 out of 5

Thursday, April 30, 2026

Weather Forecast

Moderate rain
50.2°F
44.1°F
46.5°F
88%
0.24 in
92%
0%
13.9 mph
3.1


Air Quality

AQI: 1 - Good
PM2.5: 3.04 μg/m3
PM10: 3.16 μg/m3
Carbon Monoxide: 158.73 μg/m3
Nitrogen Dioxide: 3.59 μg/m3
Sulphur Dioxide: 1.35 μg/m3
Ozone: 77.56 μg/m3

Astronomical

Sunrise: 5:56 AM
Sun Transit: 1:00 PM
Sunset: 8:07 PM
Daylight: 14 hrs 11 mins
Moonrise: 7:29 PM
Moon Transit: 12:00 AM
Moonset: 5:04 AM
Moon Phase: Full
Moon Illumination: 99.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:35 PM - 4:05 PM

Minor Periods

6:59 PM - 8:29 PM
4:34 AM - 6:04 AM

Action Rating: 5 out of 5

Friday, May 1, 2026

Weather Forecast

Patchy rain nearby
46.6°F
36°F
42°F
80%
0.11 in
81%
0%
15.7 mph
4.5


Air Quality

AQI: 1 - Good
PM2.5: 2.53 μg/m3
PM10: 2.7 μg/m3
Carbon Monoxide: 151.09 μg/m3
Nitrogen Dioxide: 2.94 μg/m3
Sulphur Dioxide: 1.17 μg/m3
Ozone: 70.64 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 1:00 PM
Sunset: 8:08 PM
Daylight: 14 hrs 14 mins
Moonrise: 8:36 PM
Moon Transit: 12:31 AM
Moonset: 5:25 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:01 AM - 2:31 AM
2:19 PM - 4:49 PM

Minor Periods

8:06 PM - 9:36 PM
4:55 AM - 6:25 AM

Action Rating: 4 out of 5

Saturday, May 2, 2026

Weather Forecast

Patchy rain nearby
46°F
37.9°F
41.6°F
79%
0.1 in
89%
0%
15.7 mph
5.1


Air Quality

AQI: 1 - Good
PM2.5: 3.35 μg/m3
PM10: 3.81 μg/m3
Carbon Monoxide: 155.25 μg/m3
Nitrogen Dioxide: 3.33 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 72.8 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 1:00 PM
Sunset: 8:09 PM
Daylight: 14 hrs 16 mins
Moonrise: 9:42 PM
Moon Transit: 1:16 AM
Moonset: 5:50 AM
Moon Phase: Full
Moon Illumination: 98.4%

Best Times for Fishing or Hunting

Major Periods

12:46 AM - 3:16 AM
3:06 PM - 5:36 PM

Minor Periods

9:12 PM - 10:42 PM
5:20 AM - 6:50 AM

Action Rating: 3 out of 5

Sunday, May 3, 2026

Weather Forecast

Patchy rain nearby
46.5°F
35.2°F
41.4°F
76%
0.03 in
88%
0%
16.8 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 6.12 μg/m3
PM10: 8.13 μg/m3
Carbon Monoxide: 164.47 μg/m3
Nitrogen Dioxide: 5.25 μg/m3
Sulphur Dioxide: 1.43 μg/m3
Ozone: 67.38 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 1:00 PM
Sunset: 8:10 PM
Daylight: 14 hrs 19 mins
Moonrise: 10:46 PM
Moon Transit: 2:04 AM
Moonset: 6:22 AM
Moon Phase: Full
Moon Illumination: 94.4%

Best Times for Fishing or Hunting

Major Periods

1:34 AM - 4:04 AM
3:55 PM - 6:25 PM

Minor Periods

10:16 PM - 11:46 PM
5:52 AM - 7:22 AM

Action Rating: 4 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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