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

50.4°F
Sunny
Sunny
47.4°F
52.3°F
74%
WNW 7.4 mph
9.5 mph
50.6°F
46.2°F
0 in
0%
9 mi
1013 mbar
1.9

Five Day Weather Forecast

Sunny
Thu
H: 74°F
L: 40°F
Partly Cloudy
Fri
H: 52°F
L: 42°F
Partly Cloudy
Sat
H: 47°F
L: 41°F
Patchy rain nearby
Sun
H: 48°F
L: 42°F
Patchy rain nearby
Mon
H: 53°F
L: 44°F

Air Quality

AQI: 1 - Good
PM2.5: 11.55 μg/m3
PM10: 12.65 μg/m3
Carbon Monoxide: 177.85 μg/m3
Nitrogen Dioxide: 7.65 μg/m3
Sulphur Dioxide: 2.35 μg/m3
Ozone: 101 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 12:46 AM
Sunset: 7:37 PM
Daylight: 13 hrs 41 mins
Moonrise: 11:11 AM
Moon Transit: 7:00 PM
Moonset: 1:58 AM
Moon Phase: First Quarter
Moon Illumination: 39.1%

Best Times for Fishing or Hunting

Major Periods

8:30 AM - 11:00 AM
6:30 PM - 9:00 PM

Minor Periods

10:41 AM - 12:11 AM
1:28 AM - 2:58 AM

Action Rating: 2 out of 5

Thursday, April 23, 2026

Weather Forecast

Sunny
73.6°F
39.6°F
53.7°F
66%
0 in
0%
0%
12.8 mph
5.7


Air Quality

AQI: 1 - Good
PM2.5: 13.81 μg/m3
PM10: 18.08 μg/m3
Carbon Monoxide: 184.21 μg/m3
Nitrogen Dioxide: 7.84 μg/m3
Sulphur Dioxide: 2.1 μg/m3
Ozone: 90.84 μg/m3

Astronomical

Sunrise: 5:57 AM
Sun Transit: 12:46 AM
Sunset: 7:37 PM
Daylight: 13 hrs 41 mins
Moonrise: 11:11 AM
Moon Transit: 7:00 PM
Moonset: 1:58 AM
Moon Phase: First Quarter
Moon Illumination: 39.1%

Best Times for Fishing or Hunting

Major Periods

8:30 AM - 11:00 AM
6:30 PM - 9:00 PM

Minor Periods

10:41 AM - 12:11 AM
1:28 AM - 2:58 AM

Action Rating: 2 out of 5

Friday, April 24, 2026

Weather Forecast

Partly Cloudy
51.5°F
41.7°F
46°F
61%
0 in
0%
0%
12.3 mph
5.6


Air Quality

AQI: 1 - Good
PM2.5: 7.76 μg/m3
PM10: 8.44 μg/m3
Carbon Monoxide: 182.53 μg/m3
Nitrogen Dioxide: 13.17 μg/m3
Sulphur Dioxide: 1.95 μg/m3
Ozone: 71.4 μg/m3

Astronomical

Sunrise: 5:55 AM
Sun Transit: 12:46 AM
Sunset: 7:38 PM
Daylight: 13 hrs 43 mins
Moonrise: 12:26 AM
Moon Transit: 7:52 PM
Moonset: 2:36 AM
Moon Phase: First Quarter
Moon Illumination: 50.4%

Best Times for Fishing or Hunting

Major Periods

9:25 AM - 11:55 AM
7:22 PM - 9:52 PM

Minor Periods

11:56 AM - 1:26 PM
2:06 AM - 3:36 AM

Action Rating: 3 out of 5

Saturday, April 25, 2026

Weather Forecast

Partly Cloudy
47.2°F
40.5°F
43.7°F
74%
0 in
0%
0%
8.3 mph
1.6


Air Quality

AQI: 1 - Good
PM2.5: 6 μg/m3
PM10: 7.88 μg/m3
Carbon Monoxide: 187.33 μg/m3
Nitrogen Dioxide: 4.71 μg/m3
Sulphur Dioxide: 1.6 μg/m3
Ozone: 88.96 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 12:46 AM
Sunset: 7:39 PM
Daylight: 13 hrs 46 mins
Moonrise: 1:38 PM
Moon Transit: 8:40 PM
Moonset: 3:05 AM
Moon Phase: First Quarter
Moon Illumination: 61.6%

Best Times for Fishing or Hunting

Major Periods

10:15 AM - 12:45 AM
8:10 PM - 10:40 PM

Minor Periods

1:08 PM - 2:38 PM
2:35 AM - 4:05 AM

Action Rating: 2 out of 5

Sunday, April 26, 2026

Weather Forecast

Patchy rain nearby
47.8°F
42.4°F
45.3°F
82%
0.01 in
89%
0%
8.7 mph
6.2


Air Quality

AQI: 1 - Good
PM2.5: 5.43 μg/m3
PM10: 7.02 μg/m3
Carbon Monoxide: 184.11 μg/m3
Nitrogen Dioxide: 6.49 μg/m3
Sulphur Dioxide: 1.7 μg/m3
Ozone: 80.88 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 12:46 AM
Sunset: 7:40 PM
Daylight: 13 hrs 48 mins
Moonrise: 2:47 PM
Moon Transit: 9:25 PM
Moonset: 3:30 AM
Moon Phase: First Quarter
Moon Illumination: 72.3%

Best Times for Fishing or Hunting

Major Periods

11:01 AM - 1:31 PM
8:55 PM - 11:25 PM

Minor Periods

2:17 PM - 3:47 PM
3:00 AM - 4:30 AM

Action Rating: 2 out of 5

Monday, April 27, 2026

Weather Forecast

Patchy rain nearby
53.4°F
43.9°F
46.8°F
85%
0.02 in
88%
0%
9.4 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 9.27 μg/m3
PM10: 10.72 μg/m3
Carbon Monoxide: 223.23 μg/m3
Nitrogen Dioxide: 13.69 μg/m3
Sulphur Dioxide: 2.04 μg/m3
Ozone: 70.62 μg/m3

Astronomical

Sunrise: 5:51 AM
Sun Transit: 12:45 AM
Sunset: 7:41 PM
Daylight: 13 hrs 51 mins
Moonrise: 3:53 PM
Moon Transit: 10:07 PM
Moonset: 3:52 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 81.8%

Best Times for Fishing or Hunting

Major Periods

11:44 AM - 2:14 PM
12:00 AM - 12:00 AM

Minor Periods

3:23 PM - 4:53 PM
3:22 AM - 4:52 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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