Water Temperature of the Thames River in Groton, CT

Current Water Temperature

73.2°F

Measurement Time: Thursday, August 20, 2026, 7:00 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

71°F

Conditions: Mostly Clear

Humidity: 76%

Wind: NW 5 mph

Dew Point: 63°F

Weather Forecast

Tonight
63°F - Partly Cloudy

Friday
75°F - Sunny

Friday Night
56°F - Mostly Clear

Saturday
72°F - Sunny

Saturday Night
67°F - Mostly Cloudy then Chance Rain Showers

Sunday
74°F - Showers And Thunderstorms Likely

Sunday Night
62°F - Chance Showers And Thunderstorms then Partly Cloudy

Monday
76°F - Mostly Sunny

Monday Night
53°F - Partly Cloudy

Tuesday
72°F - Sunny

Tuesday Night
60°F - Mostly Clear

Wednesday
78°F - Sunny then Slight Chance Rain Showers

Wednesday Night
63°F - Slight Chance Rain Showers

Thursday
76°F - Chance Rain Showers

Astronomical

Sunrise: 6:24 AM
Sun Transit: 12:45 AM
Sunset: 7:06 PM
Daylight: 12 hrs 42 mins

Moonrise: 5:42 AM
Moon Transit: 12:21 AM
Moonset: 6:48 PM
Moon Phase: New
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

1:55 AM - 4:25 AM
11:51 AM - 2:21 PM

Minor Periods

6:18 PM - 7:48 PM
5:12 AM - 6:42 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 6:24 AM
Sun Transit: 12:45 AM
Sunset: 7:06 PM
Daylight: 12 hrs 42 mins

Moonrise: 5:42 AM
Moon Transit: 12:21 AM
Moonset: 6:48 PM
Moon Phase: New
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

1:55 AM - 4:25 AM
11:51 AM - 2:21 PM

Minor Periods

6:18 PM - 7:48 PM
5:12 AM - 6:42 AM

Action Rating: 4 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 6:25 AM
Sun Transit: 12:44 AM
Sunset: 7:04 PM
Daylight: 12 hrs 39 mins

Moonrise: 6:54 AM
Moon Transit: 1:07 PM
Moonset: 7:10 PM
Moon Phase: New
Moon Illumination: 1.7%

Best Times for Fishing or Hunting

Major Periods

2:42 AM - 5:12 AM
12:37 AM - 3:07 PM

Minor Periods

6:40 PM - 8:10 PM
6:24 AM - 7:54 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 6:25 AM
Sun Transit: 12:44 AM
Sunset: 7:04 PM
Daylight: 12 hrs 39 mins

Moonrise: 6:54 AM
Moon Transit: 1:07 PM
Moonset: 7:10 PM
Moon Phase: New
Moon Illumination: 1.7%

Best Times for Fishing or Hunting

Major Periods

2:42 AM - 5:12 AM
12:37 AM - 3:07 PM

Minor Periods

6:40 PM - 8:10 PM
6:24 AM - 7:54 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 6:26 AM
Sun Transit: 12:44 AM
Sunset: 7:03 PM
Daylight: 12 hrs 37 mins

Moonrise: 8:03 AM
Moon Transit: 1:52 PM
Moonset: 7:32 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

3:28 AM - 5:58 AM
1:22 PM - 3:52 PM

Minor Periods

7:02 PM - 8:32 PM
7:33 AM - 9:03 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 6:26 AM
Sun Transit: 12:44 AM
Sunset: 7:03 PM
Daylight: 12 hrs 37 mins

Moonrise: 8:03 AM
Moon Transit: 1:52 PM
Moonset: 7:32 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

3:28 AM - 5:58 AM
1:22 PM - 3:52 PM

Minor Periods

7:02 PM - 8:32 PM
7:33 AM - 9:03 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 6:27 AM
Sun Transit: 12:44 AM
Sunset: 7:01 PM
Daylight: 12 hrs 34 mins

Moonrise: 9:11 AM
Moon Transit: 2:37 PM
Moonset: 7:55 PM
Moon Phase: New
Moon Illumination: 2.2%

Best Times for Fishing or Hunting

Major Periods

4:13 AM - 6:43 AM
2:07 PM - 4:37 PM

Minor Periods

7:25 PM - 8:55 PM
8:41 AM - 10:11 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 6:27 AM
Sun Transit: 12:44 AM
Sunset: 7:01 PM
Daylight: 12 hrs 34 mins

Moonrise: 9:11 AM
Moon Transit: 2:37 PM
Moonset: 7:55 PM
Moon Phase: New
Moon Illumination: 2.2%

Best Times for Fishing or Hunting

Major Periods

4:13 AM - 6:43 AM
2:07 PM - 4:37 PM

Minor Periods

7:25 PM - 8:55 PM
8:41 AM - 10:11 AM

Action Rating: 5 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 6:28 AM
Sun Transit: 12:43 AM
Sunset: 6:59 PM
Daylight: 12 hrs 31 mins

Moonrise: 10:19 AM
Moon Transit: 3:23 PM
Moonset: 8:21 PM
Moon Phase: Waxing Crescent
Moon Illumination: 6.7%

Best Times for Fishing or Hunting

Major Periods

4:58 AM - 7:28 AM
2:53 PM - 5:23 PM

Minor Periods

7:51 PM - 9:21 PM
9:49 AM - 11:19 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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: 6:28 AM
Sun Transit: 12:43 AM
Sunset: 6:59 PM
Daylight: 12 hrs 31 mins

Moonrise: 10:19 AM
Moon Transit: 3:23 PM
Moonset: 8:21 PM
Moon Phase: Waxing Crescent
Moon Illumination: 6.7%

Best Times for Fishing or Hunting

Major Periods

4:58 AM - 7:28 AM
2:53 PM - 5:23 PM

Minor Periods

7:51 PM - 9:21 PM
9:49 AM - 11:19 AM

Action Rating: 2 out of 5

Wednesday, December 31, 1969

Weather Forecast

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

Conditions:

High Temperature: °F

Low Temperature: °F

Average Temperature: °F

Average Humidity: %

Precipitation: in

Chance of Rain: %

Chance of Snow: %

Maximum Wind: mph

UV Index:

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

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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