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: Partly Cloudy

Humidity: 73%

Wind: NW 8 mph

Dew Point: 62°F

Weather Forecast

Tonight
64°F - Mostly Clear

Saturday
77°F - Mostly Sunny then Showers And Thunderstorms Likely

Saturday Night
58°F - Showers And Thunderstorms Likely then Mostly Cloudy

Sunday
69°F - Mostly Sunny

Sunday Night
58°F - Mostly Clear

Labor Day
73°F - Sunny

Monday Night
57°F - Mostly Clear

Tuesday
77°F - Sunny

Tuesday Night
59°F - Partly Cloudy

Wednesday
74°F - Partly Sunny

Wednesday Night
66°F - Chance Rain Showers

Thursday
81°F - Chance Rain Showers

Thursday Night
59°F - Slight Chance Rain Showers

Friday
71°F - Mostly Sunny

Astronomical

Sunrise: 6:18 AM
Sun Transit: 12:47 AM
Sunset: 7:16 PM
Daylight: 12 hrs 58 mins

Moonrise: 11:30 PM
Moon Transit: 6:39 AM
Moonset: 2:50 PM
Moon Phase: Last Quarter
Moon Illumination: 38.0%

Best Times for Fishing or Hunting

Major Periods

6:09 AM - 8:39 AM
9:10 PM - 11:40 PM

Minor Periods

12:00 AM - 12:00 AM
2:20 PM - 3:50 PM

Action Rating: 3 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: 6:18 AM
Sun Transit: 12:47 AM
Sunset: 7:16 PM
Daylight: 12 hrs 58 mins

Moonrise: 11:30 PM
Moon Transit: 6:39 AM
Moonset: 2:50 PM
Moon Phase: Last Quarter
Moon Illumination: 38.0%

Best Times for Fishing or Hunting

Major Periods

6:09 AM - 8:39 AM
9:10 PM - 11:40 PM

Minor Periods

12:00 AM - 12:00 AM
2:20 PM - 3:50 PM

Action Rating: 3 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: 6:19 AM
Sun Transit: 12:46 AM
Sunset: 7:14 PM
Daylight: 12 hrs 55 mins

Moonrise: 12:30 AM
Moon Transit: 7:42 AM
Moonset: 3:52 PM
Moon Phase: Last Quarter
Moon Illumination: 27.4%

Best Times for Fishing or Hunting

Major Periods

7:12 AM - 9:42 AM
12:00 AM - 12:00 AM

Minor Periods

3:22 PM - 4:52 PM
12:00 AM - 12:00 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: 6:19 AM
Sun Transit: 12:46 AM
Sunset: 7:14 PM
Daylight: 12 hrs 55 mins

Moonrise: 12:30 AM
Moon Transit: 7:42 AM
Moonset: 3:52 PM
Moon Phase: Last Quarter
Moon Illumination: 27.4%

Best Times for Fishing or Hunting

Major Periods

7:12 AM - 9:42 AM
12:00 AM - 12:00 AM

Minor Periods

3:22 PM - 4:52 PM
12:00 AM - 12:00 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: 6:20 AM
Sun Transit: 12:46 AM
Sunset: 7:13 PM
Daylight: 12 hrs 53 mins

Moonrise: 12:38 AM
Moon Transit: 8:44 AM
Moonset: 4:44 PM
Moon Phase: Last Quarter
Moon Illumination: 18.0%

Best Times for Fishing or Hunting

Major Periods

8:14 AM - 10:44 AM
12:00 AM - 12:00 AM

Minor Periods

4:14 PM - 5:44 PM
12:08 AM - 1:38 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: 6:20 AM
Sun Transit: 12:46 AM
Sunset: 7:13 PM
Daylight: 12 hrs 53 mins

Moonrise: 12:38 AM
Moon Transit: 8:44 AM
Moonset: 4:44 PM
Moon Phase: Last Quarter
Moon Illumination: 18.0%

Best Times for Fishing or Hunting

Major Periods

8:14 AM - 10:44 AM
12:00 AM - 12:00 AM

Minor Periods

4:14 PM - 5:44 PM
12:08 AM - 1:38 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: 6:21 AM
Sun Transit: 12:46 AM
Sunset: 7:11 PM
Daylight: 12 hrs 50 mins

Moonrise: 1:53 AM
Moon Transit: 9:44 AM
Moonset: 5:25 PM
Moon Phase: Waning Crescent
Moon Illumination: 10.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:14 AM - 11:44 AM

Minor Periods

4:55 PM - 6:25 PM
1:23 AM - 2:53 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: 6:21 AM
Sun Transit: 12:46 AM
Sunset: 7:11 PM
Daylight: 12 hrs 50 mins

Moonrise: 1:53 AM
Moon Transit: 9:44 AM
Moonset: 5:25 PM
Moon Phase: Waning Crescent
Moon Illumination: 10.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:14 AM - 11:44 AM

Minor Periods

4:55 PM - 6:25 PM
1:23 AM - 2:53 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: 6:22 AM
Sun Transit: 12:45 AM
Sunset: 7:09 PM
Daylight: 12 hrs 47 mins

Moonrise: 3:11 AM
Moon Transit: 10:41 AM
Moonset: 5:57 PM
Moon Phase: Waning Crescent
Moon Illumination: 4.4%

Best Times for Fishing or Hunting

Major Periods

12:12 AM - 2:42 AM
10:11 AM - 12:41 AM

Minor Periods

5:27 PM - 6:57 PM
2:41 AM - 4:11 AM

Action Rating: 3 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: 6:22 AM
Sun Transit: 12:45 AM
Sunset: 7:09 PM
Daylight: 12 hrs 47 mins

Moonrise: 3:11 AM
Moon Transit: 10:41 AM
Moonset: 5:57 PM
Moon Phase: Waning Crescent
Moon Illumination: 4.4%

Best Times for Fishing or Hunting

Major Periods

12:12 AM - 2:42 AM
10:11 AM - 12:41 AM

Minor Periods

5:27 PM - 6:57 PM
2:41 AM - 4:11 AM

Action Rating: 3 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: 6:23 AM
Sun Transit: 12:45 AM
Sunset: 7:08 PM
Daylight: 12 hrs 45 mins

Moonrise: 4:28 AM
Moon Transit: 11:33 AM
Moonset: 6:25 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.9%

Best Times for Fishing or Hunting

Major Periods

1:06 AM - 3:36 AM
11:03 AM - 1:33 PM

Minor Periods

5:55 PM - 7:25 PM
3:58 AM - 5:28 AM

Action Rating: 3 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: 6:23 AM
Sun Transit: 12:45 AM
Sunset: 7:08 PM
Daylight: 12 hrs 45 mins

Moonrise: 4:28 AM
Moon Transit: 11:33 AM
Moonset: 6:25 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.9%

Best Times for Fishing or Hunting

Major Periods

1:06 AM - 3:36 AM
11:03 AM - 1:33 PM

Minor Periods

5:55 PM - 7:25 PM
3:58 AM - 5:28 AM

Action Rating: 3 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: 6:24 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

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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