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

72°F
Sunny
Sunny
75.1°F
77.8°F
61%
NW 10.3 mph
19 mph
77.2°F
51°F
0 in
0%
6 mi
1008 mbar
0.2

Five Day Weather Forecast

Sunny
Sat
H: 83°F
L: 60°F
Sunny
Sun
H: 75°F
L: 59°F
Moderate rain
Mon
H: 68°F
L: 61°F
Moderate rain
Tue
H: 68°F
L: 62°F
Sunny
Wed
H: 75°F
L: 59°F

Air Quality

AQI: 1 - Good
PM2.5: 6.7 μg/m3
PM10: 8.1 μg/m3
Carbon Monoxide: 114 μg/m3
Nitrogen Dioxide: 4.6 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 89 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

Special Weather Statement issued June 20 at 2:51AM EDT by NWS Upton NY

Effective: Sat June 20, 2026, 2:51 AM
Expires: Sat June 20, 2026, 5:00 PM

The combination of northwest winds gusting to 25 to 30 mph, relative humidity as low as 35 percent, and a lack of significant rainfall recently will lead to an elevated fire spread potential today. This forecast considers meteorological, fuel, and land conditions and has been developed in coordination with state fire and land management officials.


Small Craft Advisory issued June 20 at 2:19AM EDT until June 20 at 6:00PM EDT by NWS Upton NY

Effective: Sat June 20, 2026, 2:19 AM
Expires: Sat June 20, 2026, 6:00 PM

* WHAT...West winds 10 to 20 kt with gusts up to 25 kt and seas 2 to 4 feet on Long Island Sound. * WHERE...Long Island Sound, New York Harbor, Peconic and Gardiners Bays, and South Shore Bays from Jones Inlet through Shinnecock Bay. * WHEN...Until 6 PM EDT this evening. * 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 June 20 at 2:28PM EDT until June 20 at 6:00PM EDT by NWS Upton NY

Effective: Sat June 20, 2026, 2:28 PM
Expires: Sat June 20, 2026, 6:00 PM

* WHAT...West winds 10 to 15 kt with gusts up to 25 kt. * WHERE...Long Island Sound, New York Harbor, Peconic and Gardiners Bays, and South Shore Bays from Jones Inlet through Shinnecock Bay. * WHEN...Until 6 PM EDT this evening. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Saturday, June 20, 2026

Weather Forecast

Sunny
82.8°F
59.9°F
71.4°F
48%
0 in
2%
0%
20.4 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 5.72 μg/m3
PM10: 6.23 μg/m3
Carbon Monoxide: 114.25 μg/m3
Nitrogen Dioxide: 3.02 μg/m3
Sulphur Dioxide: 0.36 μg/m3
Ozone: 81.08 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

Sunny
75.4°F
58.5°F
67.7°F
59%
0 in
4%
0%
11.4 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 11.05 μg/m3
PM10: 12.83 μg/m3
Carbon Monoxide: 113.88 μg/m3
Nitrogen Dioxide: 6.35 μg/m3
Sulphur Dioxide: 0.59 μg/m3
Ozone: 87.54 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

Monday, June 22, 2026

Weather Forecast

Moderate rain
67.9°F
60.5°F
64°F
83%
0.41 in
83%
0%
14.3 mph
1


Air Quality

AQI: 2 - Moderate
PM2.5: 15.99 μg/m3
PM10: 21.2 μg/m3
Carbon Monoxide: 141.38 μg/m3
Nitrogen Dioxide: 9.13 μg/m3
Sulphur Dioxide: 0.62 μg/m3
Ozone: 85.71 μg/m3

Astronomical

Sunrise: 5:15 AM
Sun Transit: 12:50 AM
Sunset: 8:26 PM
Daylight: 15 hrs 11 mins
Moonrise: 1:46 PM
Moon Transit: 7:29 PM
Moonset: 12:43 AM
Moon Phase: First Quarter
Moon Illumination: 49.7%

Best Times for Fishing or Hunting

Major Periods

9:06 AM - 11:36 AM
6:59 PM - 9:29 PM

Minor Periods

1:16 PM - 2:46 PM
12:13 AM - 1:43 AM

Action Rating: 2 out of 5

Tuesday, June 23, 2026

Weather Forecast

Moderate rain
67.5°F
61.9°F
64.2°F
94%
0.39 in
89%
0%
9.6 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 5.1 μg/m3
PM10: 6.15 μg/m3
Carbon Monoxide: 133.96 μg/m3
Nitrogen Dioxide: 4.27 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 96.17 μg/m3

Astronomical

Sunrise: 5:15 AM
Sun Transit: 12:50 AM
Sunset: 8:26 PM
Daylight: 15 hrs 10 mins
Moonrise: 2:51 PM
Moon Transit: 8:12 PM
Moonset: 1:03 AM
Moon Phase: First Quarter
Moon Illumination: 61.0%

Best Times for Fishing or Hunting

Major Periods

9:48 AM - 12:18 AM
7:42 PM - 10:12 PM

Minor Periods

2:21 PM - 3:51 PM
12:33 AM - 2:03 AM

Action Rating: 2 out of 5

Wednesday, June 24, 2026

Weather Forecast

Sunny
75.4°F
58.9°F
67.3°F
74%
0 in
7%
0%
9.6 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 3.98 μg/m3
PM10: 4.09 μg/m3
Carbon Monoxide: 160.44 μg/m3
Nitrogen Dioxide: 5.9 μg/m3
Sulphur Dioxide: 0.37 μg/m3
Ozone: 55.67 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:50 AM
Sunset: 8:26 PM
Daylight: 15 hrs 10 mins
Moonrise: 3:55 PM
Moon Transit: 8:56 PM
Moonset: 1:25 AM
Moon Phase: First Quarter
Moon Illumination: 71.7%

Best Times for Fishing or Hunting

Major Periods

10:31 AM - 1:01 PM
8:26 PM - 10:56 PM

Minor Periods

3:25 PM - 4:55 PM
12:55 AM - 2:25 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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