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

69°F

Conditions: Mostly Sunny

Humidity: 87%

Wind: SW 9 mph

Dew Point: 65°F

Weather Forecast

Today
75°F - Mostly Sunny then Chance Showers And Thunderstorms

Tonight
59°F - Chance Showers And Thunderstorms

Saturday
68°F - Sunny

Saturday Night
52°F - Mostly Clear

Sunday
64°F - Partly Sunny then Chance Rain Showers

Sunday Night
55°F - Chance Rain Showers

Monday
68°F - Mostly Sunny

Monday Night
44°F - Mostly Clear

Tuesday
59°F - Sunny

Tuesday Night
41°F - Clear

Wednesday
60°F - Sunny

Wednesday Night
48°F - Mostly Clear

Thursday
65°F - Sunny

Thursday Night
52°F - Partly Cloudy

Astronomical

Sunrise: 6:46 AM
Sun Transit: 12:37 AM
Sunset: 6:29 PM
Daylight: 11 hrs 42 mins

Moonrise: 10:30 PM
Moon Transit: 5:36 AM
Moonset: 1:47 PM
Moon Phase: Last Quarter
Moon Illumination: 55.3%

Best Times for Fishing or Hunting

Major Periods

5:06 AM - 7:36 AM
8:07 PM - 10:37 PM

Minor Periods

10:00 PM - 11:30 PM
1:17 PM - 2:47 PM

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: 6:46 AM
Sun Transit: 12:37 AM
Sunset: 6:29 PM
Daylight: 11 hrs 42 mins

Moonrise: 10:30 PM
Moon Transit: 5:36 AM
Moonset: 1:47 PM
Moon Phase: Last Quarter
Moon Illumination: 55.3%

Best Times for Fishing or Hunting

Major Periods

5:06 AM - 7:36 AM
8:07 PM - 10:37 PM

Minor Periods

10:00 PM - 11:30 PM
1:17 PM - 2:47 PM

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: 6:46 AM
Sun Transit: 12:37 AM
Sunset: 6:29 PM
Daylight: 11 hrs 42 mins

Moonrise: 10:30 PM
Moon Transit: 5:36 AM
Moonset: 1:47 PM
Moon Phase: Last Quarter
Moon Illumination: 55.3%

Best Times for Fishing or Hunting

Major Periods

5:06 AM - 7:36 AM
8:07 PM - 10:37 PM

Minor Periods

10:00 PM - 11:30 PM
1:17 PM - 2:47 PM

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: 6:47 AM
Sun Transit: 12:37 AM
Sunset: 6:27 PM
Daylight: 11 hrs 39 mins

Moonrise: 11:42 PM
Moon Transit: 6:38 AM
Moonset: 2:42 PM
Moon Phase: Last Quarter
Moon Illumination: 43.9%

Best Times for Fishing or Hunting

Major Periods

6:08 AM - 8:38 AM
9:08 PM - 11:38 PM

Minor Periods

12:00 AM - 12:00 AM
2:12 PM - 3:42 PM

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: 6:47 AM
Sun Transit: 12:37 AM
Sunset: 6:27 PM
Daylight: 11 hrs 39 mins

Moonrise: 11:42 PM
Moon Transit: 6:38 AM
Moonset: 2:42 PM
Moon Phase: Last Quarter
Moon Illumination: 43.9%

Best Times for Fishing or Hunting

Major Periods

6:08 AM - 8:38 AM
9:08 PM - 11:38 PM

Minor Periods

12:00 AM - 12:00 AM
2:12 PM - 3:42 PM

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: 6:48 AM
Sun Transit: 12:36 AM
Sunset: 6:25 PM
Daylight: 11 hrs 37 mins

Moonrise: 12:42 AM
Moon Transit: 7:38 AM
Moonset: 3:24 PM
Moon Phase: Last Quarter
Moon Illumination: 32.9%

Best Times for Fishing or Hunting

Major Periods

7:08 AM - 9:38 AM
12:00 AM - 12:00 AM

Minor Periods

2:54 PM - 4:24 PM
12:00 AM - 12:00 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: 6:48 AM
Sun Transit: 12:36 AM
Sunset: 6:25 PM
Daylight: 11 hrs 37 mins

Moonrise: 12:42 AM
Moon Transit: 7:38 AM
Moonset: 3:24 PM
Moon Phase: Last Quarter
Moon Illumination: 32.9%

Best Times for Fishing or Hunting

Major Periods

7:08 AM - 9:38 AM
12:00 AM - 12:00 AM

Minor Periods

2:54 PM - 4:24 PM
12:00 AM - 12:00 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: 6:50 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

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: 6:50 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

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: 6:51 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

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: 6:51 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

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: 6:52 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

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: 6:52 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

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: 6:53 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

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: 6:53 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

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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