Water Temperature of the Thames River in Groton, CT
Current Water Temperature
Measurement Time: Tuesday, March 10, 2026, 5:00 AM EDT
Temperature Locations
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Local Points of Interest
New London, CTStation Name: THAMES R AT GROTON, CT.
Data Source: Water Data - usgc.gov
Elevation Above Sea Level: 10 feet
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 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

Five Day Weather Forecast

Sun
H: 51°F
L: 26°F

Mon
H: 54°F
L: 37°F

Tue
H: 56°F
L: 45°F

Wed
H: 57°F
L: 48°F

Thu
H: 47°F
L: 40°F
Air Quality
Nitrogen Dioxide: 2.95 μg/m3
Sulphur Dioxide: 1.75 μg/m3
Ozone: 109 μg/m3
Astronomical
Sun Transit: 12:00 AM
Sunset: 7:10 PM
Daylight: 12 hrs 34 mins
Moon Transit: 10:42 PM
Moonset: 5:01 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.2%
Best Times for Fishing or Hunting
Major Periods
12:16 AM - 2:46 PM12:00 AM - 12:00 AM
Minor Periods
3:16 PM - 4:46 PM4:31 AM - 6:01 AM
Action Rating: 2 out of 5
Special Weather Statement issued March 29 at 12:17AM EDT by NWS Upton NY
Effective: Sun March 29, 2026, 12:17 AM
Expires: Sun March 29, 2026, 6:00 PM
Dry and breezy conditions expected today. The combination of afternoon RH values around 30 to 40 percent and a southwesterly flow increasing to 20 to 25 mph gusts will result in an elevated risk of fire spread. Use caution when handling any potential ignition sources, including machinery, cigarettes and matches. Any fires that ignite will have the potential to spread quickly. The forecast considers meteorological, fuel and land conditions and has been developed in coordination with state fire and land management officials.
Special Weather Statement issued March 29 at 5:43AM EDT by NWS Boston/Norton MA
Effective: Sun March 29, 2026, 5:43 AM
Expires: Sun March 29, 2026, 7:00 PM
A dry but breezy day is forecast today, with relative humidities this afternoon expected to drop into the 30 to 40 percent range and southwesterly wind gusts between 25 and 30 mph. When combined with the lack of recent significant rainfall, elevated fire weather potential will exist today. Use caution when handling and disposing of ignition sources such as matches and cigarettes.
Special Weather Statement issued March 29 at 5:43AM EDT by NWS Boston/Norton MA
Effective: Sun March 29, 2026, 5:43 AM
Expires: Sun March 29, 2026, 7:00 PM
A dry but breezy day is forecast today, with relative humidities this afternoon expected to drop into the 25 to 35 percent range and southwesterly wind gusts between 25 and 30 mph. When combined with the lack of recent significant rainfall, elevated fire weather potential will exist today. Use caution when handling and disposing of ignition sources such as matches and cigarettes.
Weather Forecast
Air Quality
Nitrogen Dioxide: 4.39 μg/m3
Sulphur Dioxide: 2.01 μg/m3
Ozone: 96.6 μg/m3
Astronomical
Sun Transit: 12:00 AM
Sunset: 7:10 PM
Daylight: 12 hrs 34 mins
Moon Transit: 10:42 PM
Moonset: 5:01 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.2%
Best Times for Fishing or Hunting
Major Periods
12:16 AM - 2:46 PM12:00 AM - 12:00 AM
Minor Periods
3:16 PM - 4:46 PM4:31 AM - 6:01 AM
Action Rating: 2 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 6.87 μg/m3
Sulphur Dioxide: 2.11 μg/m3
Ozone: 99.64 μg/m3
Astronomical
Sun Transit: 12:00 AM
Sunset: 7:11 PM
Daylight: 12 hrs 36 mins
Moon Transit: 11:26 PM
Moonset: 5:25 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 93.0%
Best Times for Fishing or Hunting
Major Periods
1:02 PM - 3:32 PM12:00 AM - 12:00 AM
Minor Periods
4:25 PM - 5:55 PM4:55 AM - 6:25 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 7.11 μg/m3
Sulphur Dioxide: 1.83 μg/m3
Ozone: 95.56 μg/m3
Astronomical
Sun Transit: 12:00 AM
Sunset: 7:12 PM
Daylight: 12 hrs 39 mins
Moon Transit: 12:00 AM
Moonset: 5:46 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.6%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM1:45 PM - 4:15 PM
Minor Periods
5:32 PM - 7:02 PM5:16 AM - 6:46 AM
Action Rating: 4 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 4.55 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 99.96 μg/m3
Astronomical
Sun Transit: 12:00 AM
Sunset: 7:13 PM
Daylight: 12 hrs 42 mins
Moon Transit: 12:09 AM
Moonset: 6:07 AM
Moon Phase: Full
Moon Illumination: 99.8%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM2:28 PM - 4:58 PM
Minor Periods
6:37 PM - 8:07 PM5:37 AM - 7:07 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 8.09 μg/m3
Sulphur Dioxide: 1.83 μg/m3
Ozone: 81.38 μg/m3
Astronomical
Sun Transit: 12:00 AM
Sunset: 7:15 PM
Daylight: 12 hrs 45 mins
Moon Transit: 12:51 AM
Moonset: 6:27 AM
Moon Phase: Full
Moon Illumination: 99.5%
Best Times for Fishing or Hunting
Major Periods
12:21 AM - 2:51 AM3:10 PM - 5:40 PM
Minor Periods
7:42 PM - 9:12 PM5:57 AM - 7:27 AM
Action Rating: 4 out of 5
