Water Temperature of the Thames River in Groton, CT

Current Water Temperature

44.8°F

Measurement Time: Wednesday, December 10, 2025, 3:03 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

19°F
Overcast
Overcast
5.3°F
16.1°F
70%
W 14.3 mph
20.3 mph
8.6°F
10.5°F
0 in
100%
9 mi
1008 mbar
0

Five Day Weather Forecast

Sunny
Fri
H: 32°F
L: 15°F
Partly Cloudy
Sat
H: 30°F
L: 23°F
Overcast
Sun
H: 34°F
L: 27°F
Partly Cloudy
Mon
H: 29°F
L: 21°F
Moderate or heavy snow showers
Tue
H: 40°F
L: 29°F

Air Quality

AQI: 1 - Good
PM2.5: 5.95 μg/m3
PM10: 6.15 μg/m3
Carbon Monoxide: 200.85 μg/m3
Nitrogen Dioxide: 10.05 μg/m3
Sulphur Dioxide: 5.15 μg/m3
Ozone: 72 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 11:52 AM
Sunset: 4:31 PM
Daylight: 9 hrs 17 mins
Moonrise: 3:28 PM
Moon Transit: 11:40 PM
Moonset: 6:48 AM
Moon Phase: Full
Moon Illumination: 99.2%

Best Times for Fishing or Hunting

Major Periods

1:07 PM - 3:37 PM
12:00 AM - 12:00 AM

Minor Periods

2:58 PM - 4:28 PM
6:18 AM - 7:48 AM

Action Rating: 4 out of 5

Friday, January 2, 2026

Weather Forecast

Sunny
31.5°F
14.7°F
22.6°F
55%
0 in
0%
0%
16.6 mph
0.2


Air Quality

AQI: 1 - Good
PM2.5: 3.88 μg/m3
PM10: 4.04 μg/m3
Carbon Monoxide: 187.85 μg/m3
Nitrogen Dioxide: 6.59 μg/m3
Sulphur Dioxide: 3.2 μg/m3
Ozone: 75.28 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 11:52 AM
Sunset: 4:31 PM
Daylight: 9 hrs 17 mins
Moonrise: 3:28 PM
Moon Transit: 11:40 PM
Moonset: 6:48 AM
Moon Phase: Full
Moon Illumination: 99.2%

Best Times for Fishing or Hunting

Major Periods

1:07 PM - 3:37 PM
12:00 AM - 12:00 AM

Minor Periods

2:58 PM - 4:28 PM
6:18 AM - 7:48 AM

Action Rating: 4 out of 5

Saturday, January 3, 2026

Weather Forecast

Partly Cloudy
30.4°F
23.2°F
27°F
56%
0 in
0%
0%
13.2 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 3.3 μg/m3
PM10: 3.31 μg/m3
Carbon Monoxide: 198.49 μg/m3
Nitrogen Dioxide: 5.4 μg/m3
Sulphur Dioxide: 2.1 μg/m3
Ozone: 76.52 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 11:52 AM
Sunset: 4:32 PM
Daylight: 9 hrs 18 mins
Moonrise: 4:45 PM
Moon Transit: 12:00 AM
Moonset: 7:46 AM
Moon Phase: Full
Moon Illumination: 99.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:12 PM - 4:42 PM

Minor Periods

4:15 PM - 5:45 PM
7:16 AM - 8:46 AM

Action Rating: 6 out of 5

Sunday, January 4, 2026

Weather Forecast

Overcast
33.8°F
26.6°F
30.4°F
70%
0 in
0%
0%
14.3 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 4.3 μg/m3
PM10: 4.4 μg/m3
Carbon Monoxide: 248.49 μg/m3
Nitrogen Dioxide: 7.44 μg/m3
Sulphur Dioxide: 2.33 μg/m3
Ozone: 68.72 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 11:53 AM
Sunset: 4:33 PM
Daylight: 9 hrs 18 mins
Moonrise: 6:04 PM
Moon Transit: 12:44 AM
Moonset: 8:32 AM
Moon Phase: Full
Moon Illumination: 98.1%

Best Times for Fishing or Hunting

Major Periods

12:14 AM - 2:44 AM
3:12 PM - 5:42 PM

Minor Periods

5:34 PM - 7:04 PM
8:02 AM - 9:32 AM

Action Rating: 3 out of 5

Monday, January 5, 2026

Weather Forecast

Partly Cloudy
29.1°F
21°F
25.5°F
58%
0 in
0%
3%
16.3 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 3.47 μg/m3
PM10: 3.55 μg/m3
Carbon Monoxide: 207.06 μg/m3
Nitrogen Dioxide: 5.83 μg/m3
Sulphur Dioxide: 1.97 μg/m3
Ozone: 68.96 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 11:53 AM
Sunset: 4:34 PM
Daylight: 9 hrs 19 mins
Moonrise: 7:21 PM
Moon Transit: 1:42 AM
Moonset: 9:06 AM
Moon Phase: Full
Moon Illumination: 93.7%

Best Times for Fishing or Hunting

Major Periods

1:12 AM - 3:42 AM
4:07 PM - 6:37 PM

Minor Periods

6:51 PM - 8:21 PM
8:36 AM - 10:06 AM

Action Rating: 4 out of 5

Tuesday, January 6, 2026

Weather Forecast

Moderate or heavy snow showers
39.8°F
28.9°F
33.5°F
91%
0.13 in
61%
41%
11 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 4.33 μg/m3
PM10: 5.37 μg/m3
Carbon Monoxide: 169.84 μg/m3
Nitrogen Dioxide: 4.83 μg/m3
Sulphur Dioxide: 2.13 μg/m3
Ozone: 69.69 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 11:54 AM
Sunset: 4:35 PM
Daylight: 9 hrs 20 mins
Moonrise: 8:34 PM
Moon Transit: 2:34 AM
Moonset: 9:34 AM
Moon Phase: Waning Gibbous
Moon Illumination: 87.1%

Best Times for Fishing or Hunting

Major Periods

2:04 AM - 4:34 AM
4:56 PM - 7:26 PM

Minor Periods

8:04 PM - 9:34 PM
9:04 AM - 10:34 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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