Water Temperature of the Thames River in Groton, CT

Current Water Temperature

71.1°F

Measurement Time: Sunday, September 13, 2026, 8:45 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

57°F
Mostly Cloudy
Mostly Cloudy
90%
E 6 mph
54°F

Weather Forecast

Slight Chance Light Rain
Overnight
54°F - Slight Chance Light Rain
Rain
Sunday
65°F - Rain
Periods Of Rain
Sunday Night
59°F - Periods Of Rain
Chance Light Rain then Mostly Cloudy
Monday
66°F - Chance Light Rain then Mostly Cloudy
Mostly Cloudy
Monday Night
56°F - Mostly Cloudy
Chance Rain Showers
Tuesday
61°F - Chance Rain Showers
Chance Rain Showers then Mostly Cloudy
Tuesday Night
53°F - Chance Rain Showers then Mostly Cloudy
Partly Sunny
Wednesday
62°F - Partly Sunny
Mostly Cloudy
Wednesday Night
49°F - Mostly Cloudy
Chance Rain Showers
Thursday
65°F - Chance Rain Showers
Chance Rain Showers
Thursday Night
49°F - Chance Rain Showers
Chance Rain Showers
Friday
65°F - Chance Rain Showers
Chance Rain Showers
Friday Night
50°F - Chance Rain Showers
Chance Rain Showers
Saturday
67°F - Chance Rain Showers

Astronomical

Sunrise: 6:34 AM
Sun Transit: 12:41 AM
Sunset: 6:49 PM
Daylight: 12 hrs 15 mins
Moonrise: 3:55 PM
Moon Transit: 8:24 PM
Moonset: 12:56 AM
Moon Phase: First Quarter
Moon Illumination: 65.4%

Best Times for Fishing or Hunting

Major Periods

9:57 AM - 12:27 AM
7:54 PM - 10:24 PM

Minor Periods

3:25 PM - 4:55 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:34 AM
Sun Transit: 12:41 AM
Sunset: 6:49 PM
Daylight: 12 hrs 15 mins
Moonrise: 3:55 PM
Moon Transit: 8:24 PM
Moonset: 12:56 AM
Moon Phase: First Quarter
Moon Illumination: 65.4%

Best Times for Fishing or Hunting

Major Periods

9:57 AM - 12:27 AM
7:54 PM - 10:24 PM

Minor Periods

3:25 PM - 4:55 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:34 AM
Sun Transit: 12:41 AM
Sunset: 6:49 PM
Daylight: 12 hrs 15 mins
Moonrise: 3:55 PM
Moon Transit: 8:24 PM
Moonset: 12:56 AM
Moon Phase: First Quarter
Moon Illumination: 65.4%

Best Times for Fishing or Hunting

Major Periods

9:57 AM - 12:27 AM
7:54 PM - 10:24 PM

Minor Periods

3:25 PM - 4:55 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:34 AM
Sun Transit: 12:41 AM
Sunset: 6:49 PM
Daylight: 12 hrs 15 mins
Moonrise: 3:55 PM
Moon Transit: 8:24 PM
Moonset: 12:56 AM
Moon Phase: First Quarter
Moon Illumination: 65.4%

Best Times for Fishing or Hunting

Major Periods

9:57 AM - 12:27 AM
7:54 PM - 10:24 PM

Minor Periods

3:25 PM - 4:55 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:35 AM
Sun Transit: 12:41 AM
Sunset: 6:47 PM
Daylight: 12 hrs 12 mins
Moonrise: 4:28 PM
Moon Transit: 9:12 PM
Moonset: 12:59 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 75.7%

Best Times for Fishing or Hunting

Major Periods

10:46 AM - 1:16 PM
8:42 PM - 11:12 PM

Minor Periods

3:58 PM - 5:28 PM
12:29 AM - 1:59 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:35 AM
Sun Transit: 12:41 AM
Sunset: 6:47 PM
Daylight: 12 hrs 12 mins
Moonrise: 4:28 PM
Moon Transit: 9:12 PM
Moonset: 12:59 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 75.7%

Best Times for Fishing or Hunting

Major Periods

10:46 AM - 1:16 PM
8:42 PM - 11:12 PM

Minor Periods

3:58 PM - 5:28 PM
12:29 AM - 1:59 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:36 AM
Sun Transit: 12:40 AM
Sunset: 6:46 PM
Daylight: 12 hrs 10 mins
Moonrise: 4:56 PM
Moon Transit: 9:58 PM
Moonset: 2:03 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 84.7%

Best Times for Fishing or Hunting

Major Periods

11:33 AM - 2:03 PM
9:28 PM - 11:58 PM

Minor Periods

4:26 PM - 5:56 PM
1:33 AM - 3:03 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:36 AM
Sun Transit: 12:40 AM
Sunset: 6:46 PM
Daylight: 12 hrs 10 mins
Moonrise: 4:56 PM
Moon Transit: 9:58 PM
Moonset: 2:03 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 84.7%

Best Times for Fishing or Hunting

Major Periods

11:33 AM - 2:03 PM
9:28 PM - 11:58 PM

Minor Periods

4:26 PM - 5:56 PM
1:33 AM - 3:03 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:37 AM
Sun Transit: 12:40 AM
Sunset: 6:44 PM
Daylight: 12 hrs 7 mins
Moonrise: 5:21 PM
Moon Transit: 10:43 PM
Moonset: 3:09 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.9%

Best Times for Fishing or Hunting

Major Periods

12:18 AM - 2:48 PM
12:00 AM - 12:00 AM

Minor Periods

4:51 PM - 6:21 PM
2:39 AM - 4:09 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:37 AM
Sun Transit: 12:40 AM
Sunset: 6:44 PM
Daylight: 12 hrs 7 mins
Moonrise: 5:21 PM
Moon Transit: 10:43 PM
Moonset: 3:09 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 91.9%

Best Times for Fishing or Hunting

Major Periods

12:18 AM - 2:48 PM
12:00 AM - 12:00 AM

Minor Periods

4:51 PM - 6:21 PM
2:39 AM - 4:09 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:38 AM
Sun Transit: 12:40 AM
Sunset: 6:42 PM
Daylight: 12 hrs 4 mins
Moonrise: 5:43 PM
Moon Transit: 11:27 PM
Moonset: 4:16 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.0%

Best Times for Fishing or Hunting

Major Periods

1:03 PM - 3:33 PM
12:00 AM - 12:00 AM

Minor Periods

5:13 PM - 6:43 PM
3:46 AM - 5:16 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:38 AM
Sun Transit: 12:40 AM
Sunset: 6:42 PM
Daylight: 12 hrs 4 mins
Moonrise: 5:43 PM
Moon Transit: 11:27 PM
Moonset: 4:16 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.0%

Best Times for Fishing or Hunting

Major Periods

1:03 PM - 3:33 PM
12:00 AM - 12:00 AM

Minor Periods

5:13 PM - 6:43 PM
3:46 AM - 5:16 AM

Action Rating: 3 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:39 AM
Sun Transit: 12:39 AM
Sunset: 6:41 PM
Daylight: 12 hrs 1 mins
Moonrise: 6:04 PM
Moon Transit: 12:00 AM
Moonset: 5:23 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

5:34 PM - 7:04 PM
4:53 AM - 6:23 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:39 AM
Sun Transit: 12:39 AM
Sunset: 6:41 PM
Daylight: 12 hrs 1 mins
Moonrise: 6:04 PM
Moon Transit: 12:00 AM
Moonset: 5:23 AM
Moon Phase: Full
Moon Illumination: 99.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

5:34 PM - 7:04 PM
4:53 AM - 6:23 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

°F
°F
°F
%
in
%
%
mph


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:40 AM
Sun Transit: 12:39 AM
Sunset: 6:39 PM
Daylight: 11 hrs 59 mins
Moonrise: 6:26 PM
Moon Transit: 8:33 AM
Moonset: 6:31 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

8:03 AM - 10:33 AM
8:03 AM - 10:33 AM

Minor Periods

5:56 PM - 7:26 PM
6:01 AM - 7:31 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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