Water Temperature of the Thames River in Groton, CT

Current Water Temperature

32.0°F

Measurement Time: Monday, September 14, 2026, 9:19 PM 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

58°F
Clear
Clear
69%
N 8 mph
48°F

Weather Forecast

Clear
Overnight
51°F - Clear
Sunny
Tuesday
69°F - Sunny
Partly Cloudy
Tuesday Night
53°F - Partly Cloudy
Mostly Sunny
Wednesday
73°F - Mostly Sunny
Mostly Clear
Wednesday Night
60°F - Mostly Clear
Mostly Sunny
Thursday
75°F - Mostly Sunny
Slight Chance Rain Showers
Thursday Night
64°F - Slight Chance Rain Showers
Slight Chance Rain Showers then Partly Sunny
Friday
79°F - Slight Chance Rain Showers then Partly Sunny
Partly Cloudy
Friday Night
57°F - Partly Cloudy
Mostly Sunny
Saturday
73°F - Mostly Sunny
Chance Rain Showers
Saturday Night
59°F - Chance Rain Showers
Chance Rain Showers
Sunday
74°F - Chance Rain Showers
Chance Rain Showers
Sunday Night
57°F - Chance Rain Showers
Chance Rain Showers
Monday
71°F - Chance Rain Showers

Astronomical

Sunrise: 6:29 AM
Sun Transit: 12:43 AM
Sunset: 6:58 PM
Daylight: 12 hrs 28 mins
Moonrise: 11:25 AM
Moon Transit: 4:11 PM
Moonset: 8:51 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.4%

Best Times for Fishing or Hunting

Major Periods

5:45 AM - 8:15 AM
3:41 PM - 6:11 PM

Minor Periods

8:21 PM - 9:51 PM
10:55 AM - 12:25 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: 6:29 AM
Sun Transit: 12:43 AM
Sunset: 6:58 PM
Daylight: 12 hrs 28 mins
Moonrise: 11:25 AM
Moon Transit: 4:11 PM
Moonset: 8:51 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.4%

Best Times for Fishing or Hunting

Major Periods

5:45 AM - 8:15 AM
3:41 PM - 6:11 PM

Minor Periods

8:21 PM - 9:51 PM
10:55 AM - 12:25 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: 6:29 AM
Sun Transit: 12:43 AM
Sunset: 6:58 PM
Daylight: 12 hrs 28 mins
Moonrise: 11:25 AM
Moon Transit: 4:11 PM
Moonset: 8:51 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.4%

Best Times for Fishing or Hunting

Major Periods

5:45 AM - 8:15 AM
3:41 PM - 6:11 PM

Minor Periods

8:21 PM - 9:51 PM
10:55 AM - 12:25 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: 6:29 AM
Sun Transit: 12:43 AM
Sunset: 6:58 PM
Daylight: 12 hrs 28 mins
Moonrise: 11:25 AM
Moon Transit: 4:11 PM
Moonset: 8:51 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.4%

Best Times for Fishing or Hunting

Major Periods

5:45 AM - 8:15 AM
3:41 PM - 6:11 PM

Minor Periods

8:21 PM - 9:51 PM
10:55 AM - 12:25 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: 6:30 AM
Sun Transit: 12:43 AM
Sunset: 6:56 PM
Daylight: 12 hrs 26 mins
Moonrise: 12:31 AM
Moon Transit: 5:00 PM
Moonset: 9:26 PM
Moon Phase: Waxing Crescent
Moon Illumination: 22.0%

Best Times for Fishing or Hunting

Major Periods

6:34 AM - 9:04 AM
4:30 PM - 7:00 PM

Minor Periods

8:56 PM - 10:26 PM
12:01 AM - 1:31 PM

Action Rating: 4 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: 6:30 AM
Sun Transit: 12:43 AM
Sunset: 6:56 PM
Daylight: 12 hrs 26 mins
Moonrise: 12:31 AM
Moon Transit: 5:00 PM
Moonset: 9:26 PM
Moon Phase: Waxing Crescent
Moon Illumination: 22.0%

Best Times for Fishing or Hunting

Major Periods

6:34 AM - 9:04 AM
4:30 PM - 7:00 PM

Minor Periods

8:56 PM - 10:26 PM
12:01 AM - 1:31 PM

Action Rating: 4 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: 6:31 AM
Sun Transit: 12:42 AM
Sunset: 6:54 PM
Daylight: 12 hrs 23 mins
Moonrise: 1:32 PM
Moon Transit: 5:51 PM
Moonset: 10:09 PM
Moon Phase: Waxing Crescent
Moon Illumination: 32.1%

Best Times for Fishing or Hunting

Major Periods

7:24 AM - 9:54 AM
5:21 PM - 7:51 PM

Minor Periods

9:39 PM - 11:09 PM
1:02 PM - 2:32 PM

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: 6:31 AM
Sun Transit: 12:42 AM
Sunset: 6:54 PM
Daylight: 12 hrs 23 mins
Moonrise: 1:32 PM
Moon Transit: 5:51 PM
Moonset: 10:09 PM
Moon Phase: Waxing Crescent
Moon Illumination: 32.1%

Best Times for Fishing or Hunting

Major Periods

7:24 AM - 9:54 AM
5:21 PM - 7:51 PM

Minor Periods

9:39 PM - 11:09 PM
1:02 PM - 2:32 PM

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: 6:32 AM
Sun Transit: 12:42 AM
Sunset: 6:52 PM
Daylight: 12 hrs 20 mins
Moonrise: 2:27 PM
Moon Transit: 6:42 PM
Moonset: 10:59 PM
Moon Phase: First Quarter
Moon Illumination: 43.0%

Best Times for Fishing or Hunting

Major Periods

8:15 AM - 10:45 AM
6:12 PM - 8:42 PM

Minor Periods

10:29 PM - 11:59 PM
1:57 PM - 3:27 PM

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: 6:32 AM
Sun Transit: 12:42 AM
Sunset: 6:52 PM
Daylight: 12 hrs 20 mins
Moonrise: 2:27 PM
Moon Transit: 6:42 PM
Moonset: 10:59 PM
Moon Phase: First Quarter
Moon Illumination: 43.0%

Best Times for Fishing or Hunting

Major Periods

8:15 AM - 10:45 AM
6:12 PM - 8:42 PM

Minor Periods

10:29 PM - 11:59 PM
1:57 PM - 3:27 PM

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: 6:33 AM
Sun Transit: 12:42 AM
Sunset: 6:51 PM
Daylight: 12 hrs 18 mins
Moonrise: 3:15 PM
Moon Transit: 7:34 PM
Moonset: 11:56 PM
Moon Phase: First Quarter
Moon Illumination: 54.3%

Best Times for Fishing or Hunting

Major Periods

9:07 AM - 11:37 AM
7:04 PM - 9:34 PM

Minor Periods

12:00 AM - 12:00 AM
2:45 PM - 4:15 PM

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: 6:33 AM
Sun Transit: 12:42 AM
Sunset: 6:51 PM
Daylight: 12 hrs 18 mins
Moonrise: 3:15 PM
Moon Transit: 7:34 PM
Moonset: 11:56 PM
Moon Phase: First Quarter
Moon Illumination: 54.3%

Best Times for Fishing or Hunting

Major Periods

9:07 AM - 11:37 AM
7:04 PM - 9:34 PM

Minor Periods

12:00 AM - 12:00 AM
2:45 PM - 4:15 PM

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: 6:34 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

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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