Water Temperature of the Thames River in Groton, CT

Current Water Temperature

39.6°F

Measurement Time: Tuesday, January 6, 2026, 4:00 AM EST

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

10°F
Sunny
Sunny
-4.5°F
3.7°F
52%
WNW 11.4 mph
17.6 mph
-8°F
-7.3°F
0 in
0%
9 mi
1017 mbar
0.3

Five Day Weather Forecast

Moderate snow
Tue
H: 23°F
L: 3°F
Sunny
Wed
H: 28°F
L: 14°F
Sunny
Thu
H: 28°F
L: 11°F
Partly Cloudy
Fri
H: 17°F
L: 3°F
Sunny
Sat
H: 22°F
L: -1°F

Air Quality

AQI: 1 - Good
PM2.5: 5.65 μg/m3
PM10: 5.75 μg/m3
Carbon Monoxide: 201.85 μg/m3
Nitrogen Dioxide: 9.05 μg/m3
Sulphur Dioxide: 2.65 μg/m3
Ozone: 72 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 12:01 AM
Sunset: 4:59 PM
Daylight: 9 hrs 54 mins
Moonrise: 11:21 AM
Moon Transit: 7:14 PM
Moonset: 2:00 AM
Moon Phase: First Quarter
Moon Illumination: 68.0%

Best Times for Fishing or Hunting

Major Periods

8:43 AM - 11:13 AM
6:44 PM - 9:14 PM

Minor Periods

10:51 AM - 12:21 AM
1:30 AM - 3:00 AM

Action Rating: 2 out of 5

Tuesday, January 27, 2026

Weather Forecast

Moderate snow
23.2°F
3.2°F
14°F
66%
0.06 in
67%
3%
22.6 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 5.19 μg/m3
PM10: 5.34 μg/m3
Carbon Monoxide: 211.49 μg/m3
Nitrogen Dioxide: 7.82 μg/m3
Sulphur Dioxide: 2.95 μg/m3
Ozone: 72.8 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 12:01 AM
Sunset: 4:59 PM
Daylight: 9 hrs 54 mins
Moonrise: 11:21 AM
Moon Transit: 7:14 PM
Moonset: 2:00 AM
Moon Phase: First Quarter
Moon Illumination: 68.0%

Best Times for Fishing or Hunting

Major Periods

8:43 AM - 11:13 AM
6:44 PM - 9:14 PM

Minor Periods

10:51 AM - 12:21 AM
1:30 AM - 3:00 AM

Action Rating: 2 out of 5

Wednesday, January 28, 2026

Weather Forecast

Sunny
27.9°F
13.8°F
19.3°F
62%
0 in
0%
4%
15 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 9.07 μg/m3
PM10: 9.23 μg/m3
Carbon Monoxide: 249.57 μg/m3
Nitrogen Dioxide: 7.69 μg/m3
Sulphur Dioxide: 3.17 μg/m3
Ozone: 67.56 μg/m3

Astronomical

Sunrise: 7:03 AM
Sun Transit: 12:01 AM
Sunset: 5:00 PM
Daylight: 9 hrs 56 mins
Moonrise: 12:08 AM
Moon Transit: 8:16 PM
Moonset: 3:17 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 78.1%

Best Times for Fishing or Hunting

Major Periods

9:44 AM - 12:14 AM
7:46 PM - 10:16 PM

Minor Periods

11:38 AM - 1:08 PM
2:47 AM - 4:17 AM

Action Rating: 2 out of 5

Thursday, January 29, 2026

Weather Forecast

Sunny
28.2°F
10.9°F
19.4°F
59%
0 in
0%
0%
14.5 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 6.28 μg/m3
PM10: 6.33 μg/m3
Carbon Monoxide: 236.37 μg/m3
Nitrogen Dioxide: 7.85 μg/m3
Sulphur Dioxide: 2.4 μg/m3
Ozone: 67.36 μg/m3

Astronomical

Sunrise: 7:02 AM
Sun Transit: 12:01 AM
Sunset: 5:01 PM
Daylight: 9 hrs 59 mins
Moonrise: 1:07 PM
Moon Transit: 9:21 PM
Moonset: 4:30 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.7%

Best Times for Fishing or Hunting

Major Periods

10:48 AM - 1:18 PM
8:51 PM - 11:21 PM

Minor Periods

12:37 AM - 2:07 PM
4:00 AM - 5:30 AM

Action Rating: 2 out of 5

Friday, January 30, 2026

Weather Forecast

Partly Cloudy
17.4°F
2.8°F
11.5°F
76%
0 in
0%
11%
14.3 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 3.31 μg/m3
PM10: 3.38 μg/m3
Carbon Monoxide: 180.94 μg/m3
Nitrogen Dioxide: 4.57 μg/m3
Sulphur Dioxide: 1.56 μg/m3
Ozone: 71.96 μg/m3

Astronomical

Sunrise: 7:02 AM
Sun Transit: 12:01 AM
Sunset: 5:02 PM
Daylight: 10 hrs 1 mins
Moonrise: 2:18 PM
Moon Transit: 10:25 PM
Moonset: 5:32 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 93.4%

Best Times for Fishing or Hunting

Major Periods

11:53 AM - 2:23 PM
12:00 AM - 12:00 AM

Minor Periods

1:48 PM - 3:18 PM
5:02 AM - 6:32 AM

Action Rating: 3 out of 5

Saturday, January 31, 2026

Weather Forecast

Sunny
22.1°F
-0.9°F
9.4°F
84%
0 in
0%
0%
11.4 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 2.9 μg/m3
PM10: 3.04 μg/m3
Carbon Monoxide: 183.56 μg/m3
Nitrogen Dioxide: 4.69 μg/m3
Sulphur Dioxide: 1.46 μg/m3
Ozone: 68.54 μg/m3

Astronomical

Sunrise: 7:01 AM
Sun Transit: 12:01 AM
Sunset: 5:03 PM
Daylight: 10 hrs 3 mins
Moonrise: 3:35 PM
Moon Transit: 11:25 PM
Moonset: 6:23 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.9%

Best Times for Fishing or Hunting

Major Periods

12:54 AM - 3:24 PM
12:00 AM - 12:00 AM

Minor Periods

3:05 PM - 4:35 PM
5:53 AM - 7:23 AM

Action Rating: 4 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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