Water Temperature of the Thames River in Groton, CT

Current Water Temperature

70.0°F

Measurement Time: Tuesday, September 16, 2025, 4:15 AM EDT

Temperature Locations

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Local Points of Interest

New London, CT

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Thames River

Station Name: THAMES R AT GROTON, CT.
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 10 feet / 3 meters

Nearest Address:
515 Thames St
Groton, CT 06340
New London County

GPS Coordinates: 41.34870948, -72.0820204

Nearby Water Temperatures

Thames River, New London, CT (1.7 mi)
Mystic River, Noank, CT (5.3 mi)
Mystic Harbor, Mystic, CT (5.9 mi)
Mystic River, Mystic, CT (6.0 mi)
Mystic River, Old Mystic, CT (6.5 mi)
Pawcatuck River, Westerly, RI (13.1 mi)
Connecticut River, Old Lyme, CT (13.9 mi)
East Branch Eightmile River, Lyme, CT (14.2 mi)
Eightmile River, East Haddam, CT (14.5 mi)
Yantic River, Norwich, CT (14.7 mi)
Orient Harbor, Orient, NY (18.7 mi)
Fort Pond Bay, Montauk, NY (21.7 mi)
Connecticut River, Middletown, CT (27.8 mi)
Natchaug River, Chaplin, CT (32.3 mi)
Hemlock Brook, Foster, RI (36.4 mi)

Weather for Groton, Connecticut

Current Weather

48°F
Clear
Conditions: Clear
Humidity: 51%
Feels Like: 40.1°F
Wind: WNW 25.1 mph
Wind Gusts: 35.9 mph
Pressure: 29.71 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Thu
H: 51°F
L: 40°F
Overcast
Fri
H: 54°F
L: 38°F
Heavy rain
Sat
H: 57°F
L: 48°F
Patchy rain nearby
Sun
H: 58°F
L: 45°F
Moderate rain
Mon
H: 50°F
L: 36°F

Air Quality

AQI: 1 - Good
PM2.5: 1.15 μg/m3
PM10: 1.25 μg/m3
Carbon Monoxide: 141.85 μg/m3
Nitrogen Dioxide: 2.55 μg/m3
Sulphur Dioxide: 1.45 μg/m3
Ozone: 81 μg/m3

Astronomical

Sunrise: 6:26 AM
Sun Transit: 11:31 AM
Sunset: 4:38 PM
Daylight: 10 hrs 11 mins
Moonrise: 5:08 PM
Moon Transit: 12:04 AM
Moonset: 7:58 AM
Moon Phase: Full
Moon Illumination: 97.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:35 PM - 5:05 PM

Minor Periods

4:38 PM - 6:08 PM
7:28 AM - 8:58 AM

Action Rating: 5 out of 5

Wind Advisory issued November 5 at 12:41PM EST until November 6 at 8:00AM EST by NWS Upton NY

Effective: Wed November 5, 2025, 12:41 PM
Expires: Thu November 6, 2025, 4:00 AM

* WHAT...West winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...Portions of southern Connecticut, northeast New Jersey, and southeast New York. * WHEN...From 9 PM this evening to 8 AM EST Thursday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects.


Wind Advisory issued November 6 at 1:10AM EST until November 6 at 8:00AM EST by NWS Upton NY

Effective: Thu November 6, 2025, 1:10 AM
Expires: Thu November 6, 2025, 8:00 AM

* WHAT...Northwest winds 15 to 25 mph with gusts 45 to 55 mph. Localized higher gusts up to 60 mph possible. * WHERE...Portions of southern Connecticut, northeast New Jersey, and southeast New York. * WHEN...Until 8 AM EST this morning. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects.


Wind Advisory issued November 6 at 1:10AM EST until November 6 at 8:00AM EST by NWS Upton NY

Effective: Thu November 6, 2025, 1:10 AM
Expires: Thu November 6, 2025, 9:15 AM

* WHAT...For the Wind Advisory, northwest winds 15 to 25 mph with gusts 45 to 55 mph. Localized higher gusts up to 60 mph possible. For the Frost Advisory, temperatures as low as 32 will result in frost formation. * WHERE...Portions of southern Connecticut, northeast New Jersey, and southeast New York. * WHEN...For the Wind Advisory, until 8 AM EST this morning. For the Frost Advisory, from midnight tonight to 7 AM EST Friday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects. Take steps now to protect tender plants from the cold.


Frost Advisory issued November 6 at 1:10AM EST until November 7 at 7:00AM EST by NWS Upton NY

Effective: Thu November 6, 2025, 1:10 AM
Expires: Thu November 6, 2025, 9:15 AM

* WHAT...For the Wind Advisory, northwest winds 15 to 25 mph with gusts 45 to 55 mph. Localized higher gusts up to 60 mph possible. For the Frost Advisory, temperatures as low as 32 will result in frost formation. * WHERE...Portions of southern Connecticut, northeast New Jersey, and southeast New York. * WHEN...For the Wind Advisory, until 8 AM EST this morning. For the Frost Advisory, from midnight tonight to 7 AM EST Friday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects. Take steps now to protect tender plants from the cold.


Wind Advisory issued November 5 at 11:52AM EST until November 6 at 8:00AM EST by NWS Boston/Norton MA

Effective: Wed November 5, 2025, 11:52 AM
Expires: Thu November 6, 2025, 4:00 AM

* WHAT...West winds 20 to 30 mph with gusts up to 55 mph expected. * WHERE...Portions of northern Connecticut, central, eastern, northeastern, southeastern, and western Massachusetts, and northern and southern Rhode Island. * WHEN...From 10 PM this evening to 8 AM EST Thursday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and some power outages may result.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution.


High Wind Warning issued November 5 at 11:52AM EST until November 6 at 8:00AM EST by NWS Boston/Norton MA

Effective: Wed November 5, 2025, 11:52 AM
Expires: Thu November 6, 2025, 4:00 AM

* WHAT...West winds 30 to 35 mph with gusts up to 60 mph expected. * WHERE...Block Island RI. * WHEN...From 10 PM this evening to 8 AM EST Thursday. * IMPACTS...Damaging winds will blow down trees and power lines. Power outages are possible. Travel will be difficult, especially for high profile vehicles.

Remain in the lower levels of your home during the windstorm, and avoid windows. Watch for falling debris and tree limbs. Use caution if you must drive.


Wind Advisory issued November 5 at 12:41PM EST until November 6 at 8:00AM EST by NWS Upton NY

Effective: Wed November 5, 2025, 12:41 PM
Expires: Thu November 6, 2025, 4:00 AM

* WHAT...West winds 15 to 25 mph with gusts up to 45 mph expected. * WHERE...Portions of southern Connecticut, northeast New Jersey, and southeast New York. * WHEN...From 9 PM this evening to 8 AM EST Thursday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects.


Wind Advisory issued November 6 at 1:10AM EST until November 6 at 8:00AM EST by NWS Upton NY

Effective: Thu November 6, 2025, 1:10 AM
Expires: Thu November 6, 2025, 8:00 AM

* WHAT...Northwest winds 10 to 20 mph with gusts 45 to 55 mph. Localized higher gusts up to 60 mph possible. * WHERE...Portions of southern Connecticut, northeast New Jersey, and southeast New York. * WHEN...Until 8 AM EST this morning. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects.
Thursday, November 6, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 47.7°F
Average Humidity: 53%
Chance of Rain: 0%
Wind: 29.3 mph
UV Index: 0.4

Air Quality

AQI: 1 - Good
PM2.5: 2.55 μg/m3
PM10: 2.8 μg/m3
Carbon Monoxide: 158.85 μg/m3
Nitrogen Dioxide: 3.73 μg/m3
Sulphur Dioxide: 2.2 μg/m3
Ozone: 79.84 μg/m3

Astronomical

Sunrise: 6:26 AM
Sun Transit: 11:31 AM
Sunset: 4:38 PM
Daylight: 10 hrs 11 mins
Moonrise: 5:08 PM
Moon Transit: 12:04 AM
Moonset: 7:58 AM
Moon Phase: Full
Moon Illumination: 97.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:35 PM - 5:05 PM

Minor Periods

4:38 PM - 6:08 PM
7:28 AM - 8:58 AM

Action Rating: 5 out of 5

Friday, November 7, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 45.9°F
Average Humidity: 64%
Chance of Rain: 0%
Wind: 23.3 mph
UV Index: 0.5

Air Quality

AQI: 1 - Good
PM2.5: 3.34 μg/m3
PM10: 4.19 μg/m3
Carbon Monoxide: 167.21 μg/m3
Nitrogen Dioxide: 3.6 μg/m3
Sulphur Dioxide: 2.03 μg/m3
Ozone: 78.2 μg/m3

Astronomical

Sunrise: 6:28 AM
Sun Transit: 11:32 AM
Sunset: 4:36 PM
Daylight: 10 hrs 9 mins
Moonrise: 6:02 PM
Moon Transit: 1:08 AM
Moonset: 9:19 AM
Moon Phase: Full
Moon Illumination: 93.4%

Best Times for Fishing or Hunting

Major Periods

12:38 AM - 3:08 AM
3:41 PM - 6:11 PM

Minor Periods

5:32 PM - 7:02 PM
8:49 AM - 10:19 AM

Action Rating: 3 out of 5

Saturday, November 8, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 54.9°F
Average Humidity: 88%
Chance of Rain: 89%
Wind: 21.3 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 8.13 μg/m3
PM10: 9.4 μg/m3
Carbon Monoxide: 171.13 μg/m3
Nitrogen Dioxide: 9.46 μg/m3
Sulphur Dioxide: 4.25 μg/m3
Ozone: 85.28 μg/m3

Astronomical

Sunrise: 6:29 AM
Sun Transit: 11:32 AM
Sunset: 4:35 PM
Daylight: 10 hrs 7 mins
Moonrise: 7:08 PM
Moon Transit: 2:15 AM
Moonset: 10:30 AM
Moon Phase: Waning Gibbous
Moon Illumination: 86.7%

Best Times for Fishing or Hunting

Major Periods

1:45 AM - 4:15 AM
4:47 PM - 7:17 PM

Minor Periods

6:38 PM - 8:08 PM
10:00 AM - 11:30 AM

Action Rating: 3 out of 5

Sunday, November 9, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 52.7°F
Average Humidity: 86%
Chance of Rain: 82%
Wind: 16.6 mph
UV Index: 0.5

Air Quality

AQI: 1 - Good
PM2.5: 9.19 μg/m3
PM10: 10.74 μg/m3
Carbon Monoxide: 183.45 μg/m3
Nitrogen Dioxide: 13.11 μg/m3
Sulphur Dioxide: 3.64 μg/m3
Ozone: 64.4 μg/m3

Astronomical

Sunrise: 6:30 AM
Sun Transit: 11:32 AM
Sunset: 4:34 PM
Daylight: 10 hrs 4 mins
Moonrise: 8:22 PM
Moon Transit: 3:20 AM
Moonset: 11:26 AM
Moon Phase: Waning Gibbous
Moon Illumination: 78.1%

Best Times for Fishing or Hunting

Major Periods

2:50 AM - 5:20 AM
5:50 PM - 8:20 PM

Minor Periods

7:52 PM - 9:22 PM
10:56 AM - 12:26 AM

Action Rating: 2 out of 5

Monday, November 10, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 46°F
Average Humidity: 71%
Chance of Rain: 80%
Wind: 22.4 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 8.39 μg/m3
PM10: 8.92 μg/m3
Carbon Monoxide: 213.23 μg/m3
Nitrogen Dioxide: 13.29 μg/m3
Sulphur Dioxide: 4.53 μg/m3
Ozone: 62.77 μg/m3

Astronomical

Sunrise: 6:31 AM
Sun Transit: 11:32 AM
Sunset: 4:33 PM
Daylight: 10 hrs 2 mins
Moonrise: 9:36 PM
Moon Transit: 4:21 AM
Moonset: 12:10 AM
Moon Phase: Waning Gibbous
Moon Illumination: 68.0%

Best Times for Fishing or Hunting

Major Periods

3:51 AM - 6:21 AM
6:48 PM - 9:18 PM

Minor Periods

9:06 PM - 10:36 PM
11:40 AM - 1:10 PM

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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