Water Temperature of the Thames River in Groton, CT

Current Water Temperature

71.1°F

Measurement Time: Sunday, September 13, 2026, 8:45 AM EDT

Temperature Locations

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Local Points of Interest

New London, CT

Thames River

Station 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

62.4°F
Overcast
Conditions: Overcast
Humidity: 54%
Feels Like: 50.2°F
Wind: NNE 19.9 mph
Wind Gusts: 30 mph
Pressure: 30.18 in
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 6 mi
UV Index: 3.3

Weather Forecast

Overcast
Tue
H: 62°F
L: 50°F
Overcast
Wed
H: 56°F
L: 49°F
Overcast
Thu
H: 62°F
L: 48°F

Air Quality

PM2.5: 3.9 μg/m3
PM10: 4 μg/m3
Carbon Monoxide: 149 μg/m3
Nitrogen Dioxide: 3.5 μg/m3
Sulphur Dioxide: 1.6 μg/m3
Ozone: 89 μg/m3

Astronomical

Sunrise: 7:06 AM
Sun Transit: 12:33 AM
Sunset: 6:00 PM
Daylight: 10 hrs 54 mins
Moonrise: 3:21 PM
Moon Transit: 8:35 PM
Moonset: 12:53 AM
Moon Phase: First Quarter
Moon Illumination: 70.4%

Best Times for Fishing or Hunting

Major Periods

10:10 AM - 12:40 AM
8:05 PM - 10:35 PM

Minor Periods

2:51 PM - 4:21 PM
12:23 AM - 1:53 AM

Action Rating: 2 out of 5

Tuesday, October 20, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 55.5°F
Average Humidity: 68%
Chance of Rain: 12%
Wind: 21.5 mph
UV Index: 3.8

Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:06 AM
Sun Transit: 12:33 AM
Sunset: 6:00 PM
Daylight: 10 hrs 54 mins
Moonrise: 3:21 PM
Moon Transit: 8:35 PM
Moonset: 12:53 AM
Moon Phase: First Quarter
Moon Illumination: 70.4%

Best Times for Fishing or Hunting

Major Periods

10:10 AM - 12:40 AM
8:05 PM - 10:35 PM

Minor Periods

2:51 PM - 4:21 PM
12:23 AM - 1:53 AM

Action Rating: 2 out of 5

Wednesday, October 21, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 52.5°F
Average Humidity: 73%
Chance of Rain: 16%
Wind: 23.9 mph
UV Index: 3.6

Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:07 AM
Sun Transit: 12:32 AM
Sunset: 5:58 PM
Daylight: 10 hrs 51 mins
Moonrise: 3:44 PM
Moon Transit: 9:18 PM
Moonset: 1:58 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 80.1%

Best Times for Fishing or Hunting

Major Periods

10:54 AM - 1:24 PM
8:48 PM - 11:18 PM

Minor Periods

3:14 PM - 4:44 PM
1:28 AM - 2:58 AM

Action Rating: 2 out of 5

Thursday, October 22, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 54°F
Average Humidity: 64%
Chance of Rain: 8%
Wind: 20.6 mph
UV Index: 2.7

Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:08 AM
Sun Transit: 12:32 AM
Sunset: 5:57 PM
Daylight: 10 hrs 49 mins
Moonrise: 4:06 PM
Moon Transit: 12:00 AM
Moonset: 3:04 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 88.3%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
11:38 AM - 2:08 PM

Minor Periods

3:36 PM - 5:06 PM
2:34 AM - 4:04 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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