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

57°F

Conditions: Patchy Fog

Humidity: 96%

Wind: NW 6 mph

Dew Point: 56°F

Weather Forecast

Today
69°F - Patchy Fog then Mostly Sunny

Tonight
57°F - Partly Cloudy

Wednesday
70°F - Mostly Sunny

Wednesday Night
61°F - Mostly Cloudy

Thursday
73°F - Mostly Sunny

Thursday Night
66°F - Partly Cloudy

Friday
75°F - Mostly Sunny

Friday Night
58°F - Slight Chance Rain Showers

Saturday
70°F - Slight Chance Rain Showers

Saturday Night
50°F - Chance Rain Showers

Sunday
65°F - Rain Showers Likely

Sunday Night
51°F - Rain Showers Likely

Monday
65°F - Chance Rain Showers then Partly Sunny

Monday Night
44°F - Partly Cloudy

Astronomical

Sunrise: 6:43 AM
Sun Transit: 12:38 AM
Sunset: 6:34 PM
Daylight: 11 hrs 50 mins

Moonrise: 7:51 PM
Moon Transit: 2:37 AM
Moonset: 10:11 AM
Moon Phase: Waning Gibbous
Moon Illumination: 85.4%

Best Times for Fishing or Hunting

Major Periods

2:07 AM - 4:37 AM
5:03 PM - 7:33 PM

Minor Periods

7:21 PM - 8:51 PM
9:41 AM - 11:11 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: 6:43 AM
Sun Transit: 12:38 AM
Sunset: 6:34 PM
Daylight: 11 hrs 50 mins

Moonrise: 7:51 PM
Moon Transit: 2:37 AM
Moonset: 10:11 AM
Moon Phase: Waning Gibbous
Moon Illumination: 85.4%

Best Times for Fishing or Hunting

Major Periods

2:07 AM - 4:37 AM
5:03 PM - 7:33 PM

Minor Periods

7:21 PM - 8:51 PM
9:41 AM - 11:11 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: 6:43 AM
Sun Transit: 12:38 AM
Sunset: 6:34 PM
Daylight: 11 hrs 50 mins

Moonrise: 7:51 PM
Moon Transit: 2:37 AM
Moonset: 10:11 AM
Moon Phase: Waning Gibbous
Moon Illumination: 85.4%

Best Times for Fishing or Hunting

Major Periods

2:07 AM - 4:37 AM
5:03 PM - 7:33 PM

Minor Periods

7:21 PM - 8:51 PM
9:41 AM - 11:11 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: 6:44 AM
Sun Transit: 12:38 AM
Sunset: 6:32 PM
Daylight: 11 hrs 48 mins

Moonrise: 8:33 PM
Moon Transit: 3:33 AM
Moonset: 11:28 AM
Moon Phase: Waning Gibbous
Moon Illumination: 76.5%

Best Times for Fishing or Hunting

Major Periods

3:03 AM - 5:33 AM
6:02 PM - 8:32 PM

Minor Periods

8:03 PM - 9:33 PM
10:58 AM - 12:28 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: 6:44 AM
Sun Transit: 12:38 AM
Sunset: 6:32 PM
Daylight: 11 hrs 48 mins

Moonrise: 8:33 PM
Moon Transit: 3:33 AM
Moonset: 11:28 AM
Moon Phase: Waning Gibbous
Moon Illumination: 76.5%

Best Times for Fishing or Hunting

Major Periods

3:03 AM - 5:33 AM
6:02 PM - 8:32 PM

Minor Periods

8:03 PM - 9:33 PM
10:58 AM - 12:28 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: 6:45 AM
Sun Transit: 12:37 AM
Sunset: 6:30 PM
Daylight: 11 hrs 45 mins

Moonrise: 9:26 PM
Moon Transit: 4:33 AM
Moonset: 12:42 AM
Moon Phase: Waning Gibbous
Moon Illumination: 66.3%

Best Times for Fishing or Hunting

Major Periods

4:03 AM - 6:33 AM
7:04 PM - 9:34 PM

Minor Periods

8:56 PM - 10:26 PM
12:12 AM - 1:42 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: 6:45 AM
Sun Transit: 12:37 AM
Sunset: 6:30 PM
Daylight: 11 hrs 45 mins

Moonrise: 9:26 PM
Moon Transit: 4:33 AM
Moonset: 12:42 AM
Moon Phase: Waning Gibbous
Moon Illumination: 66.3%

Best Times for Fishing or Hunting

Major Periods

4:03 AM - 6:33 AM
7:04 PM - 9:34 PM

Minor Periods

8:56 PM - 10:26 PM
12:12 AM - 1:42 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: 6:46 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

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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