Water Temperature of the Thames River in Groton, CT

Current Water Temperature

67.3°F

Measurement Time: Wednesday, July 8, 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

75°F
Clear
Clear
78.3°F
78.6°F
82%
WSW 13.9 mph
29.1 mph
75.4°F
66.9°F
0 in
0%
9 mi
1010 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 94°F
L: 72°F
Sunny
Thu
H: 83°F
L: 70°F
Sunny
Fri
H: 80°F
L: 64°F
Light rain
Sat
H: 69°F
L: 65°F
Sunny
Sun
H: 76°F
L: 67°F

Air Quality

AQI: 1 - Good
PM2.5: 15.5 μg/m3
PM10: 17.2 μg/m3
Carbon Monoxide: 160 μg/m3
Nitrogen Dioxide: 7.4 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 114 μg/m3

Astronomical

Sunrise: 5:28 AM
Sun Transit: 12:54 AM
Sunset: 8:20 PM
Daylight: 14 hrs 52 mins
Moonrise: 6:41 AM
Moon Transit: 2:13 PM
Moonset: 9:32 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

3:44 AM - 6:14 AM
1:43 PM - 4:13 PM

Minor Periods

9:02 PM - 10:32 PM
6:11 AM - 7:41 AM

Action Rating: 3 out of 5

Small Craft Advisory issued July 14 at 2:25PM EDT until July 15 at 2:00AM EDT by NWS Upton NY

Effective: Tue July 14, 2026, 2:25 PM
Expires: Wed July 15, 2026, 2:00 AM

* WHAT...Southwest winds 10 to 20 kt with gusts up to 25 kt. * WHERE...The south shore and eastern bays of Long Island, and Long Island Sound East of the Mouth of the Connecticut River. * WHEN...Until 2 AM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.


Small Craft Advisory issued July 14 at 2:25PM EDT until July 15 at 2:00PM EDT by NWS Upton NY

Effective: Tue July 14, 2026, 2:25 PM
Expires: Wed July 15, 2026, 3:30 AM

* WHAT...Southwest winds 15 to 25 kt with gusts up to 30 kt and seas 4 to 7 feet expected. * WHERE...Fire Island Inlet NY to Montauk Point NY out 20 nm. * WHEN...Until 2 PM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Wednesday, July 15, 2026

Weather Forecast

Sunny
94.1°F
72.3°F
81.2°F
62%
0 in
4%
0%
14.5 mph
7.4


Air Quality

AQI: 1 - Good
PM2.5: 12.17 μg/m3
PM10: 12.96 μg/m3
Carbon Monoxide: 140.13 μg/m3
Nitrogen Dioxide: 5.37 μg/m3
Sulphur Dioxide: 0.87 μg/m3
Ozone: 115.38 μg/m3

Astronomical

Sunrise: 5:28 AM
Sun Transit: 12:54 AM
Sunset: 8:20 PM
Daylight: 14 hrs 52 mins
Moonrise: 6:41 AM
Moon Transit: 2:13 PM
Moonset: 9:32 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

3:44 AM - 6:14 AM
1:43 PM - 4:13 PM

Minor Periods

9:02 PM - 10:32 PM
6:11 AM - 7:41 AM

Action Rating: 3 out of 5

Thursday, July 16, 2026

Weather Forecast

Sunny
82.9°F
70.4°F
76.8°F
56%
0 in
4%
0%
13.4 mph
7.5


Air Quality

AQI: 1 - Good
PM2.5: 15.38 μg/m3
PM10: 17.1 μg/m3
Carbon Monoxide: 153.17 μg/m3
Nitrogen Dioxide: 6.43 μg/m3
Sulphur Dioxide: 0.65 μg/m3
Ozone: 107.67 μg/m3

Astronomical

Sunrise: 5:29 AM
Sun Transit: 12:54 AM
Sunset: 8:20 PM
Daylight: 14 hrs 51 mins
Moonrise: 8:00 AM
Moon Transit: 3:07 PM
Moonset: 10:00 PM
Moon Phase: New
Moon Illumination: 2.4%

Best Times for Fishing or Hunting

Major Periods

4:39 AM - 7:09 AM
2:37 PM - 5:07 PM

Minor Periods

9:30 PM - 11:00 PM
7:30 AM - 9:00 AM

Action Rating: 3 out of 5

Friday, July 17, 2026

Weather Forecast

Sunny
79.8°F
64.3°F
72.2°F
59%
0 in
4%
0%
9.4 mph
7.9


Air Quality

AQI: 1 - Good
PM2.5: 7.79 μg/m3
PM10: 9.71 μg/m3
Carbon Monoxide: 137.46 μg/m3
Nitrogen Dioxide: 6.75 μg/m3
Sulphur Dioxide: 0.46 μg/m3
Ozone: 80.08 μg/m3

Astronomical

Sunrise: 5:30 AM
Sun Transit: 12:54 AM
Sunset: 8:19 PM
Daylight: 14 hrs 50 mins
Moonrise: 9:15 AM
Moon Transit: 3:55 PM
Moonset: 10:24 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.0%

Best Times for Fishing or Hunting

Major Periods

5:30 AM - 8:00 AM
3:25 PM - 5:55 PM

Minor Periods

9:54 PM - 11:24 PM
8:45 AM - 10:15 AM

Action Rating: 3 out of 5

Saturday, July 18, 2026

Weather Forecast

Light rain
69.1°F
64.7°F
66.7°F
92%
0.48 in
90%
0%
13.9 mph
1.7


Air Quality

AQI: 1 - Good
PM2.5: 9.33 μg/m3
PM10: 13.38 μg/m3
Carbon Monoxide: 158.69 μg/m3
Nitrogen Dioxide: 3.42 μg/m3
Sulphur Dioxide: 0.48 μg/m3
Ozone: 90.58 μg/m3

Astronomical

Sunrise: 5:30 AM
Sun Transit: 12:54 AM
Sunset: 8:18 PM
Daylight: 14 hrs 48 mins
Moonrise: 10:26 AM
Moon Transit: 4:41 PM
Moonset: 10:45 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.9%

Best Times for Fishing or Hunting

Major Periods

6:16 AM - 8:46 AM
4:11 PM - 6:41 PM

Minor Periods

10:15 PM - 11:45 PM
9:56 AM - 11:26 AM

Action Rating: 2 out of 5

Sunday, July 19, 2026

Weather Forecast

Sunny
75.7°F
66.5°F
69.7°F
88%
0 in
31%
0%
7.4 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 6.76 μg/m3
PM10: 8.84 μg/m3
Carbon Monoxide: 215.22 μg/m3
Nitrogen Dioxide: 3.33 μg/m3
Sulphur Dioxide: 0.49 μg/m3
Ozone: 100.11 μg/m3

Astronomical

Sunrise: 5:31 AM
Sun Transit: 12:54 AM
Sunset: 8:18 PM
Daylight: 14 hrs 46 mins
Moonrise: 11:33 AM
Moon Transit: 5:25 PM
Moonset: 11:06 PM
Moon Phase: Waxing Crescent
Moon Illumination: 22.6%

Best Times for Fishing or Hunting

Major Periods

7:01 AM - 9:31 AM
4:55 PM - 7:25 PM

Minor Periods

12:00 AM - 12:00 AM
11:03 AM - 12:33 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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