Water Temperature of the Thames River in Groton, CT
Current Water Temperature
Measurement Time: Friday, June 20, 2025, 4:45 AM EDT
Temperature Locations
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Local Points of Interest
New London, CTSponsored Content
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

Humidity: 97%
Feels Like: 76.6°F
Wind: WSW 5.4 mph
Wind Gusts: 9.3 mph
Precipitation: 0 in
Cloud Cover: 25%
Visibility: 8 mi
UV Index: 0
Five Day Weather Forecast

Wed
H: 81°F
L: 72°F

Thu
H: 74°F
L: 69°F

Fri
H: 73°F
L: 68°F

Sat
H: 76°F
L: 68°F

Sun
H: 77°F
L: 69°F
Air Quality
Nitrogen Dioxide: 38.3 μg/m3
Sulphur Dioxide: 6.11 μg/m3
Ozone: 84 μg/m3
Astronomical
Sun Transit: 12:53 AM
Sunset: 8:23 PM
Daylight: 15 hrs mins
Moon Transit: 12:00 AM
Moonset: 3:40 AM
Moon Phase: Full
Moon Illumination: 99.6%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM1:52 PM - 4:22 PM
Minor Periods
7:34 PM - 9:04 PM3:10 AM - 4:40 AM
Action Rating: 3 out of 5
Flood Watch issued July 8 at 2:16PM EDT until July 9 at 2:00AM EDT by NWS Upton NY
Effective: Tue July 8, 2025, 2:16 PM
Expires: Wed July 9, 2025, 2:00 AM
* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of southern Connecticut, including the following areas, Northern Fairfield, Northern Middlesex, Northern New Haven, Northern New London, Southern Fairfield, Southern Middlesex, Southern New Haven and Southern New London, northeast New Jersey, including the following areas, Eastern Bergen, Eastern Essex, Eastern Passaic, Eastern Union, Hudson, Western Bergen, Western Essex, Western Passaic and Western Union, and southeast New York, including the following areas, Bronx, Kings (Brooklyn), New York (Manhattan), Northeast Suffolk, Northern Nassau, Northern Queens, Northern Westchester, Northwest Suffolk, Orange, Putnam, Richmond (Staten Island), Rockland, Southeast Suffolk, Southern Nassau, Southern Queens, Southern Westchester and Southwest Suffolk. * WHEN...Until 2 AM EDT Wednesday. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - A slow moving frontal boundary will interact with a tropical air mass to bring showers and thunderstorms this afternoon and evening. Locally heavy rainfall is possible and rainfall rates may be near, or exceed, 2" per hour at times. This rainfall could lead to flash flooding. - http://www.weather.gov/safety/flood
You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
Flood Watch issued July 8 at 2:16PM EDT until July 9 at 2:00AM EDT by NWS Upton NY
Effective: Tue July 8, 2025, 2:16 PM
Expires: Wed July 9, 2025, 2:00 AM
* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of southern Connecticut, including the following areas, Northern Fairfield, Northern Middlesex, Northern New Haven, Northern New London, Southern Fairfield, Southern Middlesex, Southern New Haven and Southern New London, northeast New Jersey, including the following areas, Eastern Bergen, Eastern Essex, Eastern Passaic, Eastern Union, Hudson, Western Bergen, Western Essex, Western Passaic and Western Union, and southeast New York, including the following areas, Bronx, Kings (Brooklyn), New York (Manhattan), Northeast Suffolk, Northern Nassau, Northern Queens, Northern Westchester, Northwest Suffolk, Orange, Putnam, Richmond (Staten Island), Rockland, Southeast Suffolk, Southern Nassau, Southern Queens, Southern Westchester and Southwest Suffolk. * WHEN...Until 2 AM EDT Wednesday. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - A slow moving frontal boundary will interact with a tropical air mass to bring showers and thunderstorms this afternoon and evening. Locally heavy rainfall is possible and rainfall rates may be near, or exceed, 2" per hour at times. This rainfall could lead to flash flooding. - http://www.weather.gov/safety/flood
You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
Weather Forecast
Average Temperature: 75°F
Average Humidity: 94%
Wind: 7.8 mph
UV Index: 2.5
Air Quality
Nitrogen Dioxide: 25.55 μg/m3
Sulphur Dioxide: 3.76 μg/m3
Ozone: 150.16 μg/m3
Astronomical
Sun Transit: 12:53 AM
Sunset: 8:23 PM
Daylight: 15 hrs mins
Moon Transit: 12:00 AM
Moonset: 3:40 AM
Moon Phase: Full
Moon Illumination: 99.6%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM1:52 PM - 4:22 PM
Minor Periods
7:34 PM - 9:04 PM3:10 AM - 4:40 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 71.4°F
Average Humidity: 96%
Wind: 10.1 mph
UV Index: 1.6
Air Quality
Nitrogen Dioxide: 13.08 μg/m3
Sulphur Dioxide: 0.21 μg/m3
Ozone: 125.76 μg/m3
Astronomical
Sun Transit: 12:53 AM
Sunset: 8:23 PM
Daylight: 14 hrs 59 mins
Moon Transit: 12:20 AM
Moonset: 4:40 AM
Moon Phase: Full
Moon Illumination: 99.8%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM2:46 PM - 5:16 PM
Minor Periods
8:19 PM - 9:49 PM4:10 AM - 5:40 AM
Action Rating: 5 out of 5
Weather Forecast
Average Temperature: 70.3°F
Average Humidity: 91%
Wind: 9.6 mph
UV Index: 0.9
Air Quality
Nitrogen Dioxide: 14.07 μg/m3
Sulphur Dioxide: 0.45 μg/m3
Ozone: 87.44 μg/m3
Astronomical
Sun Transit: 12:53 AM
Sunset: 8:23 PM
Daylight: 14 hrs 57 mins
Moon Transit: 1:15 AM
Moonset: 5:47 AM
Moon Phase: Full
Moon Illumination: 97.4%
Best Times for Fishing or Hunting
Major Periods
12:45 AM - 3:15 AM3:40 PM - 6:10 PM
Minor Periods
8:55 PM - 10:25 PM5:17 AM - 6:47 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 72.5°F
Average Humidity: 87%
Wind: 7.2 mph
UV Index: 2
Air Quality
Nitrogen Dioxide: 21.66 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 99.77 μg/m3
Astronomical
Sun Transit: 12:54 AM
Sunset: 8:22 PM
Daylight: 14 hrs 56 mins
Moon Transit: 2:07 AM
Moonset: 6:58 AM
Moon Phase: Full
Moon Illumination: 92.7%
Best Times for Fishing or Hunting
Major Periods
1:37 AM - 4:07 AM4:31 PM - 7:01 PM
Minor Periods
9:25 PM - 10:55 PM6:28 AM - 7:58 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 72.4°F
Average Humidity: 89%
Wind: 9.6 mph
UV Index: 0.1
Air Quality
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3
Astronomical
Sun Transit: 12:54 AM
Sunset: 8:21 PM
Daylight: 14 hrs 55 mins
Moon Transit: 2:58 AM
Moonset: 8:10 AM
Moon Phase: Waning Gibbous
Moon Illumination: 85.7%
Best Times for Fishing or Hunting
Major Periods
2:28 AM - 4:58 AM5:20 PM - 7:50 PM
Minor Periods
9:51 PM - 11:21 PM7:40 AM - 9:10 AM
Action Rating: 3 out of 5