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

67°F
Chance Showers And Thunderstorms
Chance Showers And Thunderstorms
100%
E 12 mph
67°F

Weather Forecast

Chance Showers And Thunderstorms
Tonight
63°F - Chance Showers And Thunderstorms
Mostly Cloudy
Wednesday
71°F - Mostly Cloudy
Mostly Cloudy then Showers And Thunderstorms Likely
Wednesday Night
65°F - Mostly Cloudy then Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Thursday
74°F - Showers And Thunderstorms Likely
Showers And Thunderstorms Likely
Thursday Night
68°F - Showers And Thunderstorms Likely
Sunny
Friday
77°F - Sunny
Mostly Clear
Friday Night
60°F - Mostly Clear
Sunny then Slight Chance Rain Showers
Saturday
76°F - Sunny then Slight Chance Rain Showers
Slight Chance Rain Showers then Partly Cloudy
Saturday Night
56°F - Slight Chance Rain Showers then Partly Cloudy
Mostly Sunny
Sunday
72°F - Mostly Sunny
Mostly Clear
Sunday Night
57°F - Mostly Clear
Sunny
Labor Day
74°F - Sunny
Slight Chance Rain Showers
Monday Night
59°F - Slight Chance Rain Showers
Mostly Sunny then Slight Chance Rain Showers
Tuesday
75°F - Mostly Sunny then Slight Chance Rain Showers

Astronomical

Sunrise: 6:15 AM
Sun Transit: 12:48 AM
Sunset: 7:21 PM
Daylight: 13 hrs 6 mins
Moonrise: 9:15 PM
Moon Transit: 3:50 AM
Moonset: 11:09 AM
Moon Phase: Waning Gibbous
Moon Illumination: 71.2%

Best Times for Fishing or Hunting

Major Periods

3:20 AM - 5:50 AM
6:14 PM - 8:44 PM

Minor Periods

8:45 PM - 10:15 PM
10:39 AM - 12:09 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: 6:15 AM
Sun Transit: 12:48 AM
Sunset: 7:21 PM
Daylight: 13 hrs 6 mins
Moonrise: 9:15 PM
Moon Transit: 3:50 AM
Moonset: 11:09 AM
Moon Phase: Waning Gibbous
Moon Illumination: 71.2%

Best Times for Fishing or Hunting

Major Periods

3:20 AM - 5:50 AM
6:14 PM - 8:44 PM

Minor Periods

8:45 PM - 10:15 PM
10:39 AM - 12:09 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: 6:16 AM
Sun Transit: 12:47 AM
Sunset: 7:19 PM
Daylight: 13 hrs 3 mins
Moonrise: 9:50 PM
Moon Transit: 4:42 AM
Moonset: 12:24 AM
Moon Phase: Waning Gibbous
Moon Illumination: 60.5%

Best Times for Fishing or Hunting

Major Periods

4:12 AM - 6:42 AM
7:09 PM - 9:39 PM

Minor Periods

9:20 PM - 10:50 PM
11:54 AM - 1:24 PM

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: 6:16 AM
Sun Transit: 12:47 AM
Sunset: 7:19 PM
Daylight: 13 hrs 3 mins
Moonrise: 9:50 PM
Moon Transit: 4:42 AM
Moonset: 12:24 AM
Moon Phase: Waning Gibbous
Moon Illumination: 60.5%

Best Times for Fishing or Hunting

Major Periods

4:12 AM - 6:42 AM
7:09 PM - 9:39 PM

Minor Periods

9:20 PM - 10:50 PM
11:54 AM - 1:24 PM

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: 6:17 AM
Sun Transit: 12:47 AM
Sunset: 7:18 PM
Daylight: 13 hrs 1 mins
Moonrise: 10:35 PM
Moon Transit: 5:39 AM
Moonset: 1:39 PM
Moon Phase: Last Quarter
Moon Illumination: 49.2%

Best Times for Fishing or Hunting

Major Periods

5:09 AM - 7:39 AM
8:08 PM - 10:38 PM

Minor Periods

10:05 PM - 11:35 PM
1:09 PM - 2:39 PM

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: 6:17 AM
Sun Transit: 12:47 AM
Sunset: 7:18 PM
Daylight: 13 hrs 1 mins
Moonrise: 10:35 PM
Moon Transit: 5:39 AM
Moonset: 1:39 PM
Moon Phase: Last Quarter
Moon Illumination: 49.2%

Best Times for Fishing or Hunting

Major Periods

5:09 AM - 7:39 AM
8:08 PM - 10:38 PM

Minor Periods

10:05 PM - 11:35 PM
1:09 PM - 2:39 PM

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: 6:18 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

°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: 6:18 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

°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: 6:19 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

°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: 6:19 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

°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: 6:20 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

°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: 6:20 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

°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: 6:21 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

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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