Water Temperature of the Thames River in Groton, CT

Current Water Temperature

37.0°F

Measurement Time: Tuesday, March 10, 2026, 5:00 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

30.9°F
Clear
Clear
22.2°F
32°F
56%
WNW 10.3 mph
14.9 mph
28.6°F
26.6°F
0 in
0%
9 mi
1018 mbar
0

Five Day Weather Forecast

Sunny
Fri
H: 43°F
L: 32°F
Sunny
Sat
H: 50°F
L: 36°F
Overcast
Sun
H: 38°F
L: 30°F
Heavy rain
Mon
H: 51°F
L: 40°F
Moderate rain
Tue
H: 42°F
L: 32°F

Air Quality

AQI: 1 - Good
PM2.5: 2.95 μg/m3
PM10: 3.05 μg/m3
Carbon Monoxide: 192.85 μg/m3
Nitrogen Dioxide: 3.95 μg/m3
Sulphur Dioxide: 2.05 μg/m3
Ozone: 88 μg/m3

Astronomical

Sunrise: 7:03 AM
Sun Transit: 12:57 AM
Sunset: 6:53 PM
Daylight: 11 hrs 50 mins
Moonrise: 4:15 AM
Moon Transit: 8:36 AM
Moonset: 1:03 PM
Moon Phase: Waning Crescent
Moon Illumination: 16.4%

Best Times for Fishing or Hunting

Major Periods

8:06 AM - 10:36 AM
12:00 AM - 12:00 AM

Minor Periods

12:33 AM - 2:03 PM
3:45 AM - 5:15 AM

Action Rating: 2 out of 5

Flood Warning issued March 12 at 11:52PM EDT until March 14 at 8:21AM EDT by NWS Albany NY

Effective: Thu March 12, 2026, 11:52 PM
Expires: Fri March 13, 2026, 1:00 PM

* WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Housatonic River at Stevenson Dam. * WHEN...Until Saturday morning. * IMPACTS...At 11.5 feet, Water reaches the Maples area of Shelton. * ADDITIONAL DETAILS... - At 11:30 PM EDT Thursday the stage was 11.7 feet. - Forecast...The river is expected to rise to remain near 11.5 feet through tomorrow morning. It will then fall below flood stage early Saturday morning. - Flood stage is 11.0 feet. - http://www.weather.gov/safety/flood


Friday, March 13, 2026

Weather Forecast

Sunny
43.2°F
31.6°F
36.3°F
66%
0 in
0%
0%
22.1 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 3.4 μg/m3
PM10: 4.15 μg/m3
Carbon Monoxide: 188.29 μg/m3
Nitrogen Dioxide: 4.25 μg/m3
Sulphur Dioxide: 1.78 μg/m3
Ozone: 90.08 μg/m3

Astronomical

Sunrise: 7:03 AM
Sun Transit: 12:57 AM
Sunset: 6:53 PM
Daylight: 11 hrs 50 mins
Moonrise: 4:15 AM
Moon Transit: 8:36 AM
Moonset: 1:03 PM
Moon Phase: Waning Crescent
Moon Illumination: 16.4%

Best Times for Fishing or Hunting

Major Periods

8:06 AM - 10:36 AM
12:00 AM - 12:00 AM

Minor Periods

12:33 AM - 2:03 PM
3:45 AM - 5:15 AM

Action Rating: 2 out of 5

Saturday, March 14, 2026

Weather Forecast

Sunny
50°F
36.1°F
41.7°F
61%
0 in
0%
0%
26.6 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 4.79 μg/m3
PM10: 5.83 μg/m3
Carbon Monoxide: 178.65 μg/m3
Nitrogen Dioxide: 5.47 μg/m3
Sulphur Dioxide: 2.39 μg/m3
Ozone: 92.64 μg/m3

Astronomical

Sunrise: 7:02 AM
Sun Transit: 12:57 AM
Sunset: 6:54 PM
Daylight: 11 hrs 52 mins
Moonrise: 4:53 AM
Moon Transit: 9:27 AM
Moonset: 2:09 PM
Moon Phase: Waning Crescent
Moon Illumination: 8.9%

Best Times for Fishing or Hunting

Major Periods

8:57 AM - 11:27 AM
12:00 AM - 12:00 AM

Minor Periods

1:39 PM - 3:09 PM
4:23 AM - 5:53 AM

Action Rating: 2 out of 5

Sunday, March 15, 2026

Weather Forecast

Overcast
37.8°F
30.4°F
34.6°F
59%
0 in
0%
0%
16.1 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 4.69 μg/m3
PM10: 5.99 μg/m3
Carbon Monoxide: 193.97 μg/m3
Nitrogen Dioxide: 4.15 μg/m3
Sulphur Dioxide: 1.82 μg/m3
Ozone: 93.64 μg/m3

Astronomical

Sunrise: 7:00 AM
Sun Transit: 12:57 AM
Sunset: 6:55 PM
Daylight: 11 hrs 55 mins
Moonrise: 5:24 AM
Moon Transit: 10:16 AM
Moonset: 3:17 PM
Moon Phase: Waning Crescent
Moon Illumination: 3.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:46 AM - 12:16 AM

Minor Periods

2:47 PM - 4:17 PM
4:54 AM - 6:24 AM

Action Rating: 2 out of 5

Monday, March 16, 2026

Weather Forecast

Heavy rain
51.4°F
40.3°F
48.2°F
96%
1.06 in
79%
0%
30 mph
0.2


Air Quality

AQI: 1 - Good
PM2.5: 7.63 μg/m3
PM10: 11.46 μg/m3
Carbon Monoxide: 148.89 μg/m3
Nitrogen Dioxide: 2.13 μg/m3
Sulphur Dioxide: 1.05 μg/m3
Ozone: 92.76 μg/m3

Astronomical

Sunrise: 6:58 AM
Sun Transit: 12:56 AM
Sunset: 6:56 PM
Daylight: 11 hrs 58 mins
Moonrise: 5:51 AM
Moon Transit: 11:04 AM
Moonset: 4:27 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.6%

Best Times for Fishing or Hunting

Major Periods

12:38 AM - 3:08 AM
10:34 AM - 1:04 PM

Minor Periods

3:57 PM - 5:27 PM
5:21 AM - 6:51 AM

Action Rating: 3 out of 5

Tuesday, March 17, 2026

Weather Forecast

Moderate rain
41.8°F
32.1°F
41.8°F
76%
0.56 in
79%
0%
31.8 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 3.76 μg/m3
PM10: 4.99 μg/m3
Carbon Monoxide: 130.41 μg/m3
Nitrogen Dioxide: 3.7 μg/m3
Sulphur Dioxide: 1.63 μg/m3
Ozone: 70.38 μg/m3

Astronomical

Sunrise: 6:57 AM
Sun Transit: 12:56 AM
Sunset: 6:57 PM
Daylight: 12 hrs 1 mins
Moonrise: 6:15 AM
Moon Transit: 11:50 AM
Moonset: 5:37 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

1:25 AM - 3:55 AM
11:20 AM - 1:50 PM

Minor Periods

5:07 PM - 6:37 PM
5:45 AM - 7:15 AM

Action Rating: 5 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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