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

View Nearby Locations     View All Connecticut Locations     View Locations Near Me

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

66°F
Partly Cloudy
Partly Cloudy
70%
NW 5 mph
56°F

Weather Forecast

Partly Cloudy
Tonight
58°F - Partly Cloudy
Mostly Sunny
Tuesday
77°F - Mostly Sunny
Partly Cloudy
Tuesday Night
65°F - Partly Cloudy
Mostly Sunny
Wednesday
75°F - Mostly Sunny
Partly Cloudy
Wednesday Night
70°F - Partly Cloudy
Mostly Sunny then Chance Rain Showers
Thursday
78°F - Mostly Sunny then Chance Rain Showers
Chance Rain Showers
Thursday Night
61°F - Chance Rain Showers
Mostly Sunny
Friday
76°F - Mostly Sunny
Mostly Clear
Friday Night
56°F - Mostly Clear
Sunny
Saturday
73°F - Sunny
Partly Cloudy
Saturday Night
60°F - Partly Cloudy
Slight Chance Rain Showers
Sunday
76°F - Slight Chance Rain Showers
Partly Cloudy
Sunday Night
61°F - Partly Cloudy
Mostly Sunny
Monday
77°F - Mostly Sunny

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

°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: 6:21 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

°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: 6:22 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

°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: 6:22 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

°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: 6:23 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

°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: 6:23 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

°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: 6:24 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

°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: 6:24 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

°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: 6:25 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

°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: 6:25 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

°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: 6:26 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

°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: 6:26 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

°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: 6:27 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

°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: 6:27 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

°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: 6:28 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

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.

Webcams Near Groton, CT