Water Temperature of the Thames River in Groton, CT

Current Water Temperature

61.5°F

Measurement Time: Tuesday, June 9, 2026, 5:15 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

66.9°F
Sunny
Sunny
66.9°F
73.3°F
66%
S 8.5 mph
12.1 mph
72°F
62.8°F
0 in
0%
9 mi
1010 mbar
0.3

Five Day Weather Forecast

Sunny
Wed
H: 80°F
L: 57°F
Patchy rain nearby
Thu
H: 77°F
L: 62°F
Sunny
Fri
H: 77°F
L: 65°F
Sunny
Sat
H: 76°F
L: 62°F
Partly Cloudy
Sun
H: 72°F
L: 58°F

Air Quality

AQI: 1 - Good
PM2.5: 9.7 μg/m3
PM10: 13.6 μg/m3
Carbon Monoxide: 120 μg/m3
Nitrogen Dioxide: 6.1 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 90 μg/m3

Astronomical

Sunrise: 5:14 AM
Sun Transit: 12:49 AM
Sunset: 8:24 PM
Daylight: 15 hrs 10 mins
Moonrise: 7:49 AM
Moon Transit: 3:33 PM
Moonset: 11:04 PM
Moon Phase: Waxing Crescent
Moon Illumination: 4.6%

Best Times for Fishing or Hunting

Major Periods

5:03 AM - 7:33 AM
3:03 PM - 5:33 PM

Minor Periods

12:00 AM - 12:00 AM
7:19 AM - 8:49 AM

Action Rating: 3 out of 5

Small Craft Advisory issued June 17 at 2:44AM EDT until June 19 at 6:00AM EDT by NWS Upton NY

Effective: Wed June 17, 2026, 2:44 AM
Expires: Wed June 17, 2026, 3:45 PM

* WHAT...Southwest winds 15 to 25 kt with gusts up to 30 kt. Seas 5 to 8 feet expected on the ocean. * WHERE...Sandy Hook NJ to Montauk Point NY out 20 nm, Long Island Sound East of New Haven CT/Port Jefferson NY to the Mouth of the Connecticut River, Long Island Sound East of the Mouth of the Connecticut River, Long Island Sound West of New Haven CT/Port Jefferson NY, New York Harbor, Peconic and Gardiners Bays, and South Shore Bays from Jones Inlet through Shinnecock Bay. * WHEN...From 6 AM Thursday to 6 AM EDT Friday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Wednesday, June 17, 2026

Weather Forecast

Sunny
79.5°F
57.2°F
67.9°F
74%
0 in
7%
0%
11.4 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 9.25 μg/m3
PM10: 13.22 μg/m3
Carbon Monoxide: 118.54 μg/m3
Nitrogen Dioxide: 5.1 μg/m3
Sulphur Dioxide: 0.54 μg/m3
Ozone: 81.17 μg/m3

Astronomical

Sunrise: 5:14 AM
Sun Transit: 12:49 AM
Sunset: 8:24 PM
Daylight: 15 hrs 10 mins
Moonrise: 7:49 AM
Moon Transit: 3:33 PM
Moonset: 11:04 PM
Moon Phase: Waxing Crescent
Moon Illumination: 4.6%

Best Times for Fishing or Hunting

Major Periods

5:03 AM - 7:33 AM
3:03 PM - 5:33 PM

Minor Periods

12:00 AM - 12:00 AM
7:19 AM - 8:49 AM

Action Rating: 3 out of 5

Thursday, June 18, 2026

Weather Forecast

Patchy rain nearby
77°F
61.5°F
69.7°F
79%
0.09 in
59%
0%
22.4 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 9.63 μg/m3
PM10: 14.15 μg/m3
Carbon Monoxide: 123.42 μg/m3
Nitrogen Dioxide: 2.68 μg/m3
Sulphur Dioxide: 0.38 μg/m3
Ozone: 102.58 μg/m3

Astronomical

Sunrise: 5:14 AM
Sun Transit: 12:49 AM
Sunset: 8:25 PM
Daylight: 15 hrs 10 mins
Moonrise: 9:08 AM
Moon Transit: 4:28 PM
Moonset: 12:04 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.4%

Best Times for Fishing or Hunting

Major Periods

6:00 AM - 8:30 AM
3:58 PM - 6:28 PM

Minor Periods

8:38 AM - 10:08 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Friday, June 19, 2026

Weather Forecast

Sunny
77.2°F
65.3°F
71°F
58%
0 in
4%
0%
16.1 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 6.03 μg/m3
PM10: 7.23 μg/m3
Carbon Monoxide: 140.71 μg/m3
Nitrogen Dioxide: 7.84 μg/m3
Sulphur Dioxide: 0.58 μg/m3
Ozone: 80.5 μg/m3

Astronomical

Sunrise: 5:15 AM
Sun Transit: 12:49 AM
Sunset: 8:25 PM
Daylight: 15 hrs 10 mins
Moonrise: 10:24 AM
Moon Transit: 5:18 PM
Moonset: 12:35 AM
Moon Phase: Waxing Crescent
Moon Illumination: 18.3%

Best Times for Fishing or Hunting

Major Periods

6:52 AM - 9:22 AM
4:48 PM - 7:18 PM

Minor Periods

9:54 AM - 11:24 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Saturday, June 20, 2026

Weather Forecast

Sunny
76°F
62°F
68.9°F
57%
0 in
3%
0%
17 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 2.12 μg/m3
PM10: 2.21 μg/m3
Carbon Monoxide: 116.71 μg/m3
Nitrogen Dioxide: 3.16 μg/m3
Sulphur Dioxide: 0.38 μg/m3
Ozone: 69.79 μg/m3

Astronomical

Sunrise: 5:15 AM
Sun Transit: 12:50 AM
Sunset: 8:25 PM
Daylight: 15 hrs 11 mins
Moonrise: 11:34 AM
Moon Transit: 6:04 PM
Moonset: 1:00 AM
Moon Phase: Waxing Crescent
Moon Illumination: 27.8%

Best Times for Fishing or Hunting

Major Periods

7:39 AM - 10:09 AM
5:34 PM - 8:04 PM

Minor Periods

11:04 AM - 12:34 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Sunday, June 21, 2026

Weather Forecast

Partly Cloudy
71.7°F
57.6°F
65.9°F
67%
0 in
7%
0%
9.8 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 2.21 μg/m3
PM10: 2.22 μg/m3
Carbon Monoxide: 145.67 μg/m3
Nitrogen Dioxide: 5.26 μg/m3
Sulphur Dioxide: 0.44 μg/m3
Ozone: 57.89 μg/m3

Astronomical

Sunrise: 5:15 AM
Sun Transit: 12:50 AM
Sunset: 8:26 PM
Daylight: 15 hrs 11 mins
Moonrise: 12:42 AM
Moon Transit: 6:47 PM
Moonset: 12:22 AM
Moon Phase: First Quarter
Moon Illumination: 38.5%

Best Times for Fishing or Hunting

Major Periods

8:23 AM - 10:53 AM
6:17 PM - 8:47 PM

Minor Periods

12:12 AM - 1:42 PM
12:00 AM - 12:00 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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