Water Temperature of the Thames River in Groton, CT

Current Water Temperature

50.0°F

Measurement Time: Saturday, May 2, 2026, 11:45 PM 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

58.3°F
Patchy rain nearby
Patchy rain nearby
57°F
58.3°F
72%
NNE 10.1 mph
13.6 mph
57°F
49.2°F
0 in
78%
5 mi
1024 mbar
3

Five Day Weather Forecast

Patchy rain nearby
Thu
H: 65°F
L: 51°F
Sunny
Fri
H: 61°F
L: 46°F
Partly Cloudy
Sat
H: 59°F
L: 52°F
Patchy rain nearby
Sun
H: 55°F
L: 52°F
Patchy rain nearby
Mon
H: 59°F
L: 52°F

Air Quality

AQI: 1 - Good
PM2.5: 4.75 μg/m3
PM10: 5.05 μg/m3
Carbon Monoxide: 143.85 μg/m3
Nitrogen Dioxide: 8.45 μg/m3
Sulphur Dioxide: 1.35 μg/m3
Ozone: 64 μg/m3

Astronomical

Sunrise: 5:24 AM
Sun Transit: 12:44 AM
Sunset: 8:06 PM
Daylight: 14 hrs 42 mins
Moonrise: 10:13 AM
Moon Transit: 5:46 PM
Moonset: 12:34 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

7:18 AM - 9:48 AM
5:16 PM - 7:46 PM

Minor Periods

9:43 AM - 11:13 AM
12:04 AM - 1:34 AM

Action Rating: 3 out of 5

Thursday, May 21, 2026

Weather Forecast

Patchy rain nearby
64.6°F
51°F
59.5°F
74%
0.02 in
85%
0%
11.4 mph
1.5


Air Quality

AQI: 1 - Good
PM2.5: 6.27 μg/m3
PM10: 6.74 μg/m3
Carbon Monoxide: 150.73 μg/m3
Nitrogen Dioxide: 10.49 μg/m3
Sulphur Dioxide: 1.29 μg/m3
Ozone: 63.28 μg/m3

Astronomical

Sunrise: 5:24 AM
Sun Transit: 12:44 AM
Sunset: 8:06 PM
Daylight: 14 hrs 42 mins
Moonrise: 10:13 AM
Moon Transit: 5:46 PM
Moonset: 12:34 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

7:18 AM - 9:48 AM
5:16 PM - 7:46 PM

Minor Periods

9:43 AM - 11:13 AM
12:04 AM - 1:34 AM

Action Rating: 3 out of 5

Friday, May 22, 2026

Weather Forecast

Sunny
61.2°F
46°F
54.3°F
73%
0 in
0%
0%
11.4 mph
4


Air Quality

AQI: 1 - Good
PM2.5: 8.11 μg/m3
PM10: 10.11 μg/m3
Carbon Monoxide: 159.61 μg/m3
Nitrogen Dioxide: 8.11 μg/m3
Sulphur Dioxide: 1.38 μg/m3
Ozone: 71.08 μg/m3

Astronomical

Sunrise: 5:23 AM
Sun Transit: 12:45 AM
Sunset: 8:07 PM
Daylight: 14 hrs 44 mins
Moonrise: 11:27 AM
Moon Transit: 6:37 PM
Moonset: 1:07 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

8:11 AM - 10:41 AM
6:07 PM - 8:37 PM

Minor Periods

10:57 AM - 12:27 AM
12:37 AM - 2:07 AM

Action Rating: 3 out of 5

Saturday, May 23, 2026

Weather Forecast

Partly Cloudy
58.8°F
52.4°F
54.9°F
68%
0 in
0%
0%
9.4 mph
4


Air Quality

AQI: 1 - Good
PM2.5: 8.45 μg/m3
PM10: 12.01 μg/m3
Carbon Monoxide: 146.65 μg/m3
Nitrogen Dioxide: 4.28 μg/m3
Sulphur Dioxide: 1.23 μg/m3
Ozone: 83 μg/m3

Astronomical

Sunrise: 5:22 AM
Sun Transit: 12:45 AM
Sunset: 8:08 PM
Daylight: 14 hrs 46 mins
Moonrise: 12:39 AM
Moon Transit: 7:24 PM
Moonset: 1:34 AM
Moon Phase: First Quarter
Moon Illumination: 44.4%

Best Times for Fishing or Hunting

Major Periods

8:59 AM - 11:29 AM
6:54 PM - 9:24 PM

Minor Periods

12:09 AM - 1:39 PM
1:04 AM - 2:34 AM

Action Rating: 2 out of 5

Sunday, May 24, 2026

Weather Forecast

Patchy rain nearby
54.5°F
51.9°F
53.4°F
76%
0.11 in
87%
0%
21.3 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 8.03 μg/m3
PM10: 11.41 μg/m3
Carbon Monoxide: 124.12 μg/m3
Nitrogen Dioxide: 2.21 μg/m3
Sulphur Dioxide: 1.21 μg/m3
Ozone: 82.32 μg/m3

Astronomical

Sunrise: 5:22 AM
Sun Transit: 12:45 AM
Sunset: 8:09 PM
Daylight: 14 hrs 47 mins
Moonrise: 1:46 PM
Moon Transit: 8:07 PM
Moonset: 1:57 AM
Moon Phase: First Quarter
Moon Illumination: 55.7%

Best Times for Fishing or Hunting

Major Periods

9:43 AM - 12:13 AM
7:37 PM - 10:07 PM

Minor Periods

1:16 PM - 2:46 PM
1:27 AM - 2:57 AM

Action Rating: 2 out of 5

Monday, May 25, 2026

Weather Forecast

Patchy rain nearby
59.3°F
51.9°F
54.8°F
93%
0.06 in
78%
0%
19.5 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 8.33 μg/m3
PM10: 12.61 μg/m3
Carbon Monoxide: 125.5 μg/m3
Nitrogen Dioxide: 2.97 μg/m3
Sulphur Dioxide: 1.23 μg/m3
Ozone: 78.69 μg/m3

Astronomical

Sunrise: 5:21 AM
Sun Transit: 12:45 AM
Sunset: 8:10 PM
Daylight: 14 hrs 49 mins
Moonrise: 2:51 PM
Moon Transit: 8:49 PM
Moonset: 2:18 AM
Moon Phase: First Quarter
Moon Illumination: 66.7%

Best Times for Fishing or Hunting

Major Periods

10:26 AM - 12:56 AM
8:19 PM - 10:49 PM

Minor Periods

2:21 PM - 3:51 PM
1:48 AM - 3:18 AM

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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