Water Temperature of the Thames River in Groton, CT

Current Water Temperature

32.0°F

Measurement Time: Monday, October 5, 2026, 6:46 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

65°F
Mostly Sunny
Mostly Sunny
74%
W 7 mph
56°F

Weather Forecast

Mostly Sunny
Today
71°F - Mostly Sunny
Mostly Clear
Tonight
44°F - Mostly Clear
Sunny
Tuesday
62°F - Sunny
Clear
Tuesday Night
39°F - Clear
Sunny
Wednesday
64°F - Sunny
Mostly Clear
Wednesday Night
57°F - Mostly Clear
Sunny
Thursday
69°F - Sunny
Mostly Clear
Thursday Night
50°F - Mostly Clear
Sunny
Friday
68°F - Sunny
Mostly Clear
Friday Night
51°F - Mostly Clear
Sunny
Saturday
66°F - Sunny
Mostly Clear
Saturday Night
47°F - Mostly Clear
Mostly Sunny
Sunday
63°F - Mostly Sunny
Mostly Cloudy then Slight Chance Rain Showers
Sunday Night
52°F - Mostly Cloudy then Slight Chance Rain Showers

Astronomical

Sunrise: 6:50 AM
Sun Transit: 12:36 AM
Sunset: 6:24 PM
Daylight: 11 hrs 34 mins
Moonrise: 12:58 AM
Moon Transit: 8:34 AM
Moonset: 3:59 PM
Moon Phase: Last Quarter
Moon Illumination: 22.8%

Best Times for Fishing or Hunting

Major Periods

8:04 AM - 10:34 AM
12:00 AM - 12:00 AM

Minor Periods

3:29 PM - 4:59 PM
12:28 AM - 1:58 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: 6:50 AM
Sun Transit: 12:36 AM
Sunset: 6:24 PM
Daylight: 11 hrs 34 mins
Moonrise: 12:58 AM
Moon Transit: 8:34 AM
Moonset: 3:59 PM
Moon Phase: Last Quarter
Moon Illumination: 22.8%

Best Times for Fishing or Hunting

Major Periods

8:04 AM - 10:34 AM
12:00 AM - 12:00 AM

Minor Periods

3:29 PM - 4:59 PM
12:28 AM - 1:58 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: 6:50 AM
Sun Transit: 12:36 AM
Sunset: 6:24 PM
Daylight: 11 hrs 34 mins
Moonrise: 12:58 AM
Moon Transit: 8:34 AM
Moonset: 3:59 PM
Moon Phase: Last Quarter
Moon Illumination: 22.8%

Best Times for Fishing or Hunting

Major Periods

8:04 AM - 10:34 AM
12:00 AM - 12:00 AM

Minor Periods

3:29 PM - 4:59 PM
12:28 AM - 1:58 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: 6:51 AM
Sun Transit: 12:36 AM
Sunset: 6:22 PM
Daylight: 11 hrs 31 mins
Moonrise: 2:13 AM
Moon Transit: 9:26 AM
Moonset: 4:27 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.1%

Best Times for Fishing or Hunting

Major Periods

8:56 AM - 11:26 AM
12:00 AM - 12:00 AM

Minor Periods

3:57 PM - 5:27 PM
1:43 AM - 3:13 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: 6:51 AM
Sun Transit: 12:36 AM
Sunset: 6:22 PM
Daylight: 11 hrs 31 mins
Moonrise: 2:13 AM
Moon Transit: 9:26 AM
Moonset: 4:27 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.1%

Best Times for Fishing or Hunting

Major Periods

8:56 AM - 11:26 AM
12:00 AM - 12:00 AM

Minor Periods

3:57 PM - 5:27 PM
1:43 AM - 3:13 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: 6:52 AM
Sun Transit: 12:36 AM
Sunset: 6:20 PM
Daylight: 11 hrs 29 mins
Moonrise: 3:26 AM
Moon Transit: 10:15 AM
Moonset: 4:51 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:45 AM - 12:15 AM

Minor Periods

4:21 PM - 5:51 PM
2:56 AM - 4:26 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: 6:52 AM
Sun Transit: 12:36 AM
Sunset: 6:20 PM
Daylight: 11 hrs 29 mins
Moonrise: 3:26 AM
Moon Transit: 10:15 AM
Moonset: 4:51 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:45 AM - 12:15 AM

Minor Periods

4:21 PM - 5:51 PM
2:56 AM - 4:26 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: 6:53 AM
Sun Transit: 12:35 AM
Sunset: 6:19 PM
Daylight: 11 hrs 26 mins
Moonrise: 4:37 AM
Moon Transit: 11:01 AM
Moonset: 5:13 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

12:36 AM - 3:06 AM
10:31 AM - 1:01 PM

Minor Periods

4:43 PM - 6:13 PM
4:07 AM - 5:37 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: 6:53 AM
Sun Transit: 12:35 AM
Sunset: 6:19 PM
Daylight: 11 hrs 26 mins
Moonrise: 4:37 AM
Moon Transit: 11:01 AM
Moonset: 5:13 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

12:36 AM - 3:06 AM
10:31 AM - 1:01 PM

Minor Periods

4:43 PM - 6:13 PM
4:07 AM - 5:37 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: 6:54 AM
Sun Transit: 12:35 AM
Sunset: 6:17 PM
Daylight: 11 hrs 23 mins
Moonrise: 5:46 AM
Moon Transit: 11:45 AM
Moonset: 5:35 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

1:21 AM - 3:51 AM
11:15 AM - 1:45 PM

Minor Periods

5:05 PM - 6:35 PM
5:16 AM - 6:46 AM

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: 6:54 AM
Sun Transit: 12:35 AM
Sunset: 6:17 PM
Daylight: 11 hrs 23 mins
Moonrise: 5:46 AM
Moon Transit: 11:45 AM
Moonset: 5:35 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

1:21 AM - 3:51 AM
11:15 AM - 1:45 PM

Minor Periods

5:05 PM - 6:35 PM
5:16 AM - 6:46 AM

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: 6:55 AM
Sun Transit: 12:35 AM
Sunset: 6:15 PM
Daylight: 11 hrs 21 mins
Moonrise: 6:54 AM
Moon Transit: 12:30 AM
Moonset: 5:57 PM
Moon Phase: New
Moon Illumination: 0.5%

Best Times for Fishing or Hunting

Major Periods

2:05 AM - 4:35 AM
12:00 AM - 2:30 PM

Minor Periods

5:27 PM - 6:57 PM
6:24 AM - 7:54 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: 6:55 AM
Sun Transit: 12:35 AM
Sunset: 6:15 PM
Daylight: 11 hrs 21 mins
Moonrise: 6:54 AM
Moon Transit: 12:30 AM
Moonset: 5:57 PM
Moon Phase: New
Moon Illumination: 0.5%

Best Times for Fishing or Hunting

Major Periods

2:05 AM - 4:35 AM
12:00 AM - 2:30 PM

Minor Periods

5:27 PM - 6:57 PM
6:24 AM - 7:54 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: 6:56 AM
Sun Transit: 12:35 AM
Sunset: 6:14 PM
Daylight: 11 hrs 18 mins
Moonrise: 8:01 AM
Moon Transit: 1:16 PM
Moonset: 6:22 PM
Moon Phase: New
Moon Illumination: 3.3%

Best Times for Fishing or Hunting

Major Periods

2:51 AM - 5:21 AM
12:46 AM - 3:16 PM

Minor Periods

5:52 PM - 7:22 PM
7:31 AM - 9:01 AM

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: 6:56 AM
Sun Transit: 12:35 AM
Sunset: 6:14 PM
Daylight: 11 hrs 18 mins
Moonrise: 8:01 AM
Moon Transit: 1:16 PM
Moonset: 6:22 PM
Moon Phase: New
Moon Illumination: 3.3%

Best Times for Fishing or Hunting

Major Periods

2:51 AM - 5:21 AM
12:46 AM - 3:16 PM

Minor Periods

5:52 PM - 7:22 PM
7:31 AM - 9:01 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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