Water Temperature of the Thames River in Groton, CT

Current Water Temperature

32.0°F

Measurement Time: Saturday, September 26, 2026, 1:12 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

56°F
Light Rain Likely
Light Rain Likely
83%
NE 31 mph
51°F

Weather Forecast

Light Rain Likely
Overnight
56°F - Light Rain Likely
Rain
Saturday
63°F - Rain
Rain
Saturday Night
55°F - Rain
Showers And Thunderstorms
Sunday
67°F - Showers And Thunderstorms
Showers And Thunderstorms
Sunday Night
62°F - Showers And Thunderstorms
Rain Showers
Monday
66°F - Rain Showers
Rain Showers Likely
Monday Night
60°F - Rain Showers Likely
Slight Chance Rain Showers then Partly Sunny
Tuesday
69°F - Slight Chance Rain Showers then Partly Sunny
Mostly Cloudy
Tuesday Night
55°F - Mostly Cloudy
Mostly Sunny
Wednesday
72°F - Mostly Sunny
Partly Cloudy
Wednesday Night
57°F - Partly Cloudy
Mostly Sunny
Thursday
73°F - Mostly Sunny
Partly Cloudy
Thursday Night
59°F - Partly Cloudy
Mostly Sunny
Friday
73°F - Mostly Sunny

Astronomical

Sunrise: 6:40 AM
Sun Transit: 12:39 AM
Sunset: 6:39 PM
Daylight: 11 hrs 59 mins
Moonrise: 6:26 PM
Moon Transit: 8:33 AM
Moonset: 6:31 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

8:03 AM - 10:33 AM
8:03 AM - 10:33 AM

Minor Periods

5:56 PM - 7:26 PM
6:01 AM - 7:31 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: 6:40 AM
Sun Transit: 12:39 AM
Sunset: 6:39 PM
Daylight: 11 hrs 59 mins
Moonrise: 6:26 PM
Moon Transit: 8:33 AM
Moonset: 6:31 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

8:03 AM - 10:33 AM
8:03 AM - 10:33 AM

Minor Periods

5:56 PM - 7:26 PM
6:01 AM - 7:31 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: 6:40 AM
Sun Transit: 12:39 AM
Sunset: 6:39 PM
Daylight: 11 hrs 59 mins
Moonrise: 6:26 PM
Moon Transit: 8:33 AM
Moonset: 6:31 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

8:03 AM - 10:33 AM
8:03 AM - 10:33 AM

Minor Periods

5:56 PM - 7:26 PM
6:01 AM - 7:31 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: 6:40 AM
Sun Transit: 12:39 AM
Sunset: 6:39 PM
Daylight: 11 hrs 59 mins
Moonrise: 6:26 PM
Moon Transit: 8:33 AM
Moonset: 6:31 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

8:03 AM - 10:33 AM
8:03 AM - 10:33 AM

Minor Periods

5:56 PM - 7:26 PM
6:01 AM - 7:31 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: 6:41 AM
Sun Transit: 12:39 AM
Sunset: 6:37 PM
Daylight: 11 hrs 56 mins
Moonrise: 6:50 PM
Moon Transit: 12:00 AM
Moonset: 7:42 AM
Moon Phase: Full
Moon Illumination: 97.3%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:19 PM - 5:49 PM

Minor Periods

6:20 PM - 7:50 PM
7:12 AM - 8:42 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: 6:41 AM
Sun Transit: 12:39 AM
Sunset: 6:37 PM
Daylight: 11 hrs 56 mins
Moonrise: 6:50 PM
Moon Transit: 12:00 AM
Moonset: 7:42 AM
Moon Phase: Full
Moon Illumination: 97.3%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
3:19 PM - 5:49 PM

Minor Periods

6:20 PM - 7:50 PM
7:12 AM - 8:42 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: 6:42 AM
Sun Transit: 12:38 AM
Sunset: 6:35 PM
Daylight: 11 hrs 53 mins
Moonrise: 7:17 PM
Moon Transit: 1:45 AM
Moonset: 8:55 AM
Moon Phase: Full
Moon Illumination: 92.4%

Best Times for Fishing or Hunting

Major Periods

1:15 AM - 3:45 AM
4:09 PM - 6:39 PM

Minor Periods

6:47 PM - 8:17 PM
8:25 AM - 9:55 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: 6:42 AM
Sun Transit: 12:38 AM
Sunset: 6:35 PM
Daylight: 11 hrs 53 mins
Moonrise: 7:17 PM
Moon Transit: 1:45 AM
Moonset: 8:55 AM
Moon Phase: Full
Moon Illumination: 92.4%

Best Times for Fishing or Hunting

Major Periods

1:15 AM - 3:45 AM
4:09 PM - 6:39 PM

Minor Periods

6:47 PM - 8:17 PM
8:25 AM - 9:55 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: 6:43 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

°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: 6:43 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

°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: 6:44 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

°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: 6:44 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

°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: 6:45 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

°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: 6:45 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

°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: 6:46 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

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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