Water Temperature of the Thames River in Groton, CT

Current Water Temperature

45.5°F

Measurement Time: Monday, April 13, 2026, 4:45 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

51.1°F
Overcast
Overcast
47.2°F
51.4°F
79%
NNW 10.5 mph
14.4 mph
48.5°F
44.9°F
0 in
100%
9 mi
1009 mbar
0.4

Five Day Weather Forecast

Patchy rain nearby
Thu
H: 66°F
L: 50°F
Partly Cloudy
Fri
H: 58°F
L: 45°F
Moderate rain
Sat
H: 55°F
L: 46°F
Patchy rain nearby
Sun
H: 61°F
L: 47°F
Moderate rain
Mon
H: 60°F
L: 47°F

Air Quality

AQI: 1 - Good
PM2.5: 6.05 μg/m3
PM10: 6.25 μg/m3
Carbon Monoxide: 146.85 μg/m3
Nitrogen Dioxide: 5.95 μg/m3
Sulphur Dioxide: 1.55 μg/m3
Ozone: 90 μg/m3

Astronomical

Sunrise: 5:38 AM
Sun Transit: 12:44 AM
Sunset: 7:52 PM
Daylight: 14 hrs 14 mins
Moonrise: 12:46 AM
Moon Transit: 5:11 AM
Moonset: 9:41 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.1%

Best Times for Fishing or Hunting

Major Periods

4:41 AM - 7:11 AM
7:34 PM - 10:04 PM

Minor Periods

9:11 AM - 10:41 AM
12:16 AM - 1:46 AM

Action Rating: 3 out of 5

Thursday, May 7, 2026

Weather Forecast

Patchy rain nearby
66.4°F
49.6°F
55.6°F
68%
0.19 in
89%
0%
11 mph
2.9


Air Quality

AQI: 1 - Good
PM2.5: 6.04 μg/m3
PM10: 7.23 μg/m3
Carbon Monoxide: 152.81 μg/m3
Nitrogen Dioxide: 6.22 μg/m3
Sulphur Dioxide: 1.58 μg/m3
Ozone: 88.76 μg/m3

Astronomical

Sunrise: 5:38 AM
Sun Transit: 12:44 AM
Sunset: 7:52 PM
Daylight: 14 hrs 14 mins
Moonrise: 12:46 AM
Moon Transit: 5:11 AM
Moonset: 9:41 AM
Moon Phase: Waning Gibbous
Moon Illumination: 59.1%

Best Times for Fishing or Hunting

Major Periods

4:41 AM - 7:11 AM
7:34 PM - 10:04 PM

Minor Periods

9:11 AM - 10:41 AM
12:16 AM - 1:46 AM

Action Rating: 3 out of 5

Friday, May 8, 2026

Weather Forecast

Partly Cloudy
58°F
44.5°F
51.3°F
57%
0 in
0%
0%
16.3 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 4.55 μg/m3
PM10: 4.88 μg/m3
Carbon Monoxide: 157.85 μg/m3
Nitrogen Dioxide: 7.85 μg/m3
Sulphur Dioxide: 1.71 μg/m3
Ozone: 80.04 μg/m3

Astronomical

Sunrise: 5:37 AM
Sun Transit: 12:44 AM
Sunset: 7:53 PM
Daylight: 14 hrs 16 mins
Moonrise: 1:21 AM
Moon Transit: 6:00 AM
Moonset: 10:46 AM
Moon Phase: Last Quarter
Moon Illumination: 47.9%

Best Times for Fishing or Hunting

Major Periods

5:30 AM - 8:00 AM
8:21 PM - 10:51 PM

Minor Periods

10:16 AM - 11:46 AM
12:51 AM - 2:21 AM

Action Rating: 4 out of 5

Saturday, May 9, 2026

Weather Forecast

Moderate rain
54.5°F
46.1°F
50.6°F
85%
0.29 in
78%
0%
11.6 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 10.54 μg/m3
PM10: 13.59 μg/m3
Carbon Monoxide: 178.37 μg/m3
Nitrogen Dioxide: 7.64 μg/m3
Sulphur Dioxide: 2.01 μg/m3
Ozone: 87.72 μg/m3

Astronomical

Sunrise: 5:36 AM
Sun Transit: 12:44 AM
Sunset: 7:54 PM
Daylight: 14 hrs 19 mins
Moonrise: 1:51 AM
Moon Transit: 6:46 AM
Moonset: 11:51 AM
Moon Phase: Last Quarter
Moon Illumination: 36.7%

Best Times for Fishing or Hunting

Major Periods

6:16 AM - 8:46 AM
9:07 PM - 11:37 PM

Minor Periods

11:21 AM - 12:51 AM
1:21 AM - 2:51 AM

Action Rating: 2 out of 5

Sunday, May 10, 2026

Weather Forecast

Patchy rain nearby
60.5°F
47.2°F
54.1°F
82%
0.01 in
79%
0%
10.5 mph
3


Air Quality

AQI: 2 - Moderate
PM2.5: 18.24 μg/m3
PM10: 19.56 μg/m3
Carbon Monoxide: 189.28 μg/m3
Nitrogen Dioxide: 12.87 μg/m3
Sulphur Dioxide: 3.58 μg/m3
Ozone: 89.56 μg/m3

Astronomical

Sunrise: 5:35 AM
Sun Transit: 12:44 AM
Sunset: 7:55 PM
Daylight: 14 hrs 21 mins
Moonrise: 2:16 AM
Moon Transit: 7:32 AM
Moonset: 12:58 AM
Moon Phase: Last Quarter
Moon Illumination: 26.2%

Best Times for Fishing or Hunting

Major Periods

7:02 AM - 9:32 AM
12:00 AM - 12:00 AM

Minor Periods

12:28 AM - 1:58 PM
1:46 AM - 3:16 AM

Action Rating: 2 out of 5

Monday, May 11, 2026

Weather Forecast

Moderate rain
60.2°F
46.9°F
54.5°F
90%
0.53 in
87%
0%
25.1 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 15.42 μg/m3
PM10: 20.3 μg/m3
Carbon Monoxide: 177.66 μg/m3
Nitrogen Dioxide: 3.48 μg/m3
Sulphur Dioxide: 1.91 μg/m3
Ozone: 119.85 μg/m3

Astronomical

Sunrise: 5:33 AM
Sun Transit: 12:44 AM
Sunset: 7:56 PM
Daylight: 14 hrs 23 mins
Moonrise: 2:39 AM
Moon Transit: 8:16 AM
Moonset: 2:05 PM
Moon Phase: Last Quarter
Moon Illumination: 16.9%

Best Times for Fishing or Hunting

Major Periods

7:46 AM - 10:16 AM
12:00 AM - 12:00 AM

Minor Periods

1:35 PM - 3:05 PM
2:09 AM - 3:39 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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