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

Current Water Temperature

42.3°F

Measurement Time: Sunday, April 19, 2026, 2:30 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

40.5°F
Light drizzle
Light drizzle
33°F
43°F
82%
W 13.2 mph
16.9 mph
36.4°F
33°F
0.02 in
0%
6 mi
1012 mbar
4

Five Day Weather Forecast

Patchy rain nearby
Sun
H: 48°F
L: 35°F
Cloudy
Mon
H: 40°F
L: 30°F
Patchy rain nearby
Tue
H: 48°F
L: 30°F
Patchy rain nearby
Wed
H: 56°F
L: 42°F
Partly Cloudy
Thu
H: 53°F
L: 38°F

Air Quality

AQI: 2 - Moderate
PM2.5: 5.55 μg/m3
PM10: 7.15 μg/m3
Carbon Monoxide: 163.85 μg/m3
Nitrogen Dioxide: 2.95 μg/m3
Sulphur Dioxide: 1.35 μg/m3
Ozone: 94 μg/m3

Astronomical

Sunrise: 6:13 AM
Sun Transit: 1:02 PM
Sunset: 7:53 PM
Daylight: 13 hrs 40 mins
Moonrise: 7:02 AM
Moon Transit: 3:06 PM
Moonset: 11:22 PM
Moon Phase: Waxing Crescent
Moon Illumination: 4.9%

Best Times for Fishing or Hunting

Major Periods

4:02 AM - 6:32 AM
2:36 PM - 5:06 PM

Minor Periods

12:00 AM - 12:00 AM
6:32 AM - 8:02 AM

Action Rating: 4 out of 5

special weather statement 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: Sat April 18, 2026, 10:06 PM
Expires: Sun April 19, 2026, 2:01 PM

Rainfall expected. The ground, already near saturation, has a limited capacity to absorb this rainfall. What: Rainfall amounts of 10 to 20 mm. When: Now into Sunday morning. Additional information: A cold front will sweep through the region tonight, bringing showers and the risk of a thunderstorm. Then another round of showers, possibly mixed with snow, will move through later tonight into Sunday morning. Portions of the region have received significant rainfall amounts over the last few days. As a result, further rainfall could have significant impacts. Water will likely pool on roads and in low-lying areas. Don't drive through flooded roadways. Avoid low-lying areas. For information concerning flooding, please consult your local Conservation Authority or Ontario Ministry of Natural Resources office. Visit Ontario.ca/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.


special weather statement 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: Sat April 18, 2026, 9:10 PM
Expires: Sun April 19, 2026, 1:10 PM

Rainfall expected. The ground, already near saturation, has a limited capacity to absorb this rainfall. What: Rainfall amounts of 10 to 20 mm. When: Now into Sunday morning. Additional information: A cold front will sweep through the region this evening and tonight, bringing showers and the risk of a thunderstorm. Then another round of showers, possibly mixed with snow, will move through later tonight into Sunday morning. Portions of the region have received significant rainfall amounts over the last few days. As a result, further rainfall could have significant impacts. Water will likely pool on roads and in low-lying areas. Don't drive through flooded roadways. Avoid low-lying areas. For information concerning flooding, please consult your local Conservation Authority or Ontario Ministry of Natural Resources office. Visit Ontario.ca/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.


special weather statement 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: Sat April 18, 2026, 11:03 PM
Expires: Sun April 19, 2026, 2:02 PM

Rainfall expected. The ground, already near saturation, has a limited capacity to absorb this rainfall. What: Rainfall amounts of 10 to 20 mm. When: Now into Sunday morning. Additional information: A cold front will sweep through the region tonight, bringing showers and the risk of a thunderstorm. Then another round of showers, possibly mixed with snow, will move through later tonight into Sunday morning. Portions of the region have received significant rainfall amounts over the last few days. As a result, further rainfall could have significant impacts. Water will likely pool on roads and in low-lying areas. Don't drive through flooded roadways. Avoid low-lying areas. For information concerning flooding, please consult your local Conservation Authority or Ontario Ministry of Natural Resources office. Visit Ontario.ca/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.


Sunday, April 19, 2026

Weather Forecast

Patchy rain nearby
47.7°F
35.4°F
41.5°F
78%
0.13 in
89%
0%
17.2 mph
4.9


Air Quality

AQI: 1 - Good
PM2.5: 3.75 μg/m3
PM10: 4.31 μg/m3
Carbon Monoxide: 164.65 μg/m3
Nitrogen Dioxide: 3 μg/m3
Sulphur Dioxide: 1.37 μg/m3
Ozone: 87.4 μg/m3

Astronomical

Sunrise: 6:13 AM
Sun Transit: 1:02 PM
Sunset: 7:53 PM
Daylight: 13 hrs 40 mins
Moonrise: 7:02 AM
Moon Transit: 3:06 PM
Moonset: 11:22 PM
Moon Phase: Waxing Crescent
Moon Illumination: 4.9%

Best Times for Fishing or Hunting

Major Periods

4:02 AM - 6:32 AM
2:36 PM - 5:06 PM

Minor Periods

12:00 AM - 12:00 AM
6:32 AM - 8:02 AM

Action Rating: 4 out of 5

Monday, April 20, 2026

Weather Forecast

Cloudy
39.9°F
30.1°F
34.8°F
54%
0 in
0%
0%
14.1 mph
3.9


Air Quality

AQI: 1 - Good
PM2.5: 3.81 μg/m3
PM10: 4.47 μg/m3
Carbon Monoxide: 170.69 μg/m3
Nitrogen Dioxide: 2.19 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 87.6 μg/m3

Astronomical

Sunrise: 6:12 AM
Sun Transit: 1:02 PM
Sunset: 7:54 PM
Daylight: 13 hrs 43 mins
Moonrise: 7:49 AM
Moon Transit: 4:10 PM
Moonset: 12:22 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.8%

Best Times for Fishing or Hunting

Major Periods

5:05 AM - 7:35 AM
3:40 PM - 6:10 PM

Minor Periods

7:19 AM - 8:49 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Tuesday, April 21, 2026

Weather Forecast

Patchy rain nearby
47.9°F
29.9°F
38.6°F
60%
0.05 in
83%
0%
14.5 mph
4.8


Air Quality

AQI: 1 - Good
PM2.5: 6.4 μg/m3
PM10: 7.53 μg/m3
Carbon Monoxide: 168.05 μg/m3
Nitrogen Dioxide: 3.75 μg/m3
Sulphur Dioxide: 1.66 μg/m3
Ozone: 80.08 μg/m3

Astronomical

Sunrise: 6:10 AM
Sun Transit: 1:02 PM
Sunset: 7:56 PM
Daylight: 13 hrs 46 mins
Moonrise: 8:48 AM
Moon Transit: 5:15 PM
Moonset: 12:38 AM
Moon Phase: Waxing Crescent
Moon Illumination: 18.8%

Best Times for Fishing or Hunting

Major Periods

6:10 AM - 8:40 AM
4:45 PM - 7:15 PM

Minor Periods

8:18 AM - 9:48 AM
12:08 AM - 1:38 AM

Action Rating: 3 out of 5

Wednesday, April 22, 2026

Weather Forecast

Patchy rain nearby
56.3°F
41.8°F
47.7°F
77%
0.01 in
76%
0%
12.1 mph
5.9


Air Quality

AQI: 1 - Good
PM2.5: 14.23 μg/m3
PM10: 17.15 μg/m3
Carbon Monoxide: 176.82 μg/m3
Nitrogen Dioxide: 4.65 μg/m3
Sulphur Dioxide: 3.8 μg/m3
Ozone: 88.72 μg/m3

Astronomical

Sunrise: 6:08 AM
Sun Transit: 1:02 PM
Sunset: 7:57 PM
Daylight: 13 hrs 49 mins
Moonrise: 9:59 AM
Moon Transit: 6:17 PM
Moonset: 1:39 AM
Moon Phase: Waxing Crescent
Moon Illumination: 28.4%

Best Times for Fishing or Hunting

Major Periods

7:14 AM - 9:44 AM
5:47 PM - 8:17 PM

Minor Periods

9:29 AM - 10:59 AM
1:09 AM - 2:39 AM

Action Rating: 3 out of 5

Thursday, April 23, 2026

Weather Forecast

Partly Cloudy
52.8°F
37.7°F
44.9°F
72%
0 in
0%
0%
8.3 mph
0.6


Air Quality

AQI: 2 - Moderate
PM2.5: 26.34 μg/m3
PM10: 27.53 μg/m3
Carbon Monoxide: 245.44 μg/m3
Nitrogen Dioxide: 8.89 μg/m3
Sulphur Dioxide: 2.37 μg/m3
Ozone: 65.92 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 1:02 PM
Sunset: 7:58 PM
Daylight: 13 hrs 51 mins
Moonrise: 11:16 AM
Moon Transit: 7:15 PM
Moonset: 2:26 AM
Moon Phase: First Quarter
Moon Illumination: 39.1%

Best Times for Fishing or Hunting

Major Periods

8:14 AM - 10:44 AM
6:45 PM - 9:15 PM

Minor Periods

10:46 AM - 12:16 AM
1:56 AM - 3:26 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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