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

60.1°F
Clear
Clear
60.1°F
63.1°F
100%
S 7.6 mph
15.4 mph
63.1°F
58.4°F
0 in
0%
9 mi
1015 mbar
0

Five Day Weather Forecast

Sunny
Tue
H: 78°F
L: 63°F
Patchy rain nearby
Wed
H: 79°F
L: 67°F
Sunny
Thu
H: 75°F
L: 60°F
Sunny
Fri
H: 74°F
L: 59°F
Sunny
Sat
H: 75°F
L: 59°F

Air Quality

AQI: 1 - Good
PM2.5: 10.6 μg/m3
PM10: 14.5 μg/m3
Carbon Monoxide: 145 μg/m3
Nitrogen Dioxide: 2.4 μg/m3
Sulphur Dioxide: 0.6 μg/m3
Ozone: 106 μg/m3

Astronomical

Sunrise: 5:33 AM
Sun Transit: 12:54 AM
Sunset: 8:16 PM
Daylight: 14 hrs 43 mins
Moonrise: 1:44 PM
Moon Transit: 6:52 PM
Moonset: 12:28 AM
Moon Phase: First Quarter
Moon Illumination: 43.7%

Best Times for Fishing or Hunting

Major Periods

8:28 AM - 10:58 AM
6:22 PM - 8:52 PM

Minor Periods

1:14 PM - 2:44 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Small Craft Advisory issued July 20 at 2:33PM EDT until July 22 at 6:00PM EDT by NWS Upton NY

Effective: Mon July 20, 2026, 2:33 PM
Expires: Tue July 21, 2026, 6:00 AM

* WHAT...South winds 10 to 20 kt with gusts up to 25 kt. * WHERE...Long Island Sound east of Orient Point and the Connecticut River, and Peconic and Gardiners Bays. * WHEN...From 2 PM Tuesday to 6 PM 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 20 at 2:33PM EDT until July 22 at 6:00PM EDT by NWS Upton NY

Effective: Mon July 20, 2026, 2:33 PM
Expires: Tue July 21, 2026, 6:00 AM

* WHAT...South winds 15 to 25 kt with gusts up to 30 kt and seas 6 to 8 feet expected. * WHERE...Sandy Hook NJ to Montauk Point NY out 20 nm. * WHEN...From 8 AM Tuesday to 6 PM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Tuesday, July 21, 2026

Weather Forecast

Sunny
77.7°F
63.1°F
69.8°F
88%
0.6 in
82%
0%
20.8 mph
7.1


Air Quality

AQI: 1 - Good
PM2.5: 11.05 μg/m3
PM10: 15.52 μg/m3
Carbon Monoxide: 131.38 μg/m3
Nitrogen Dioxide: 2.18 μg/m3
Sulphur Dioxide: 0.42 μg/m3
Ozone: 99.21 μg/m3

Astronomical

Sunrise: 5:33 AM
Sun Transit: 12:54 AM
Sunset: 8:16 PM
Daylight: 14 hrs 43 mins
Moonrise: 1:44 PM
Moon Transit: 6:52 PM
Moonset: 12:28 AM
Moon Phase: First Quarter
Moon Illumination: 43.7%

Best Times for Fishing or Hunting

Major Periods

8:28 AM - 10:58 AM
6:22 PM - 8:52 PM

Minor Periods

1:14 PM - 2:44 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, July 22, 2026

Weather Forecast

Patchy rain nearby
78.9°F
66.7°F
73.4°F
82%
0.17 in
75%
0%
22.1 mph
7.4


Air Quality

AQI: 1 - Good
PM2.5: 8.78 μg/m3
PM10: 11.11 μg/m3
Carbon Monoxide: 149.63 μg/m3
Nitrogen Dioxide: 3.8 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 100.5 μg/m3

Astronomical

Sunrise: 5:34 AM
Sun Transit: 12:54 AM
Sunset: 8:15 PM
Daylight: 14 hrs 41 mins
Moonrise: 2:50 PM
Moon Transit: 7:38 PM
Moonset: 12:52 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

9:13 AM - 11:43 AM
7:08 PM - 9:38 PM

Minor Periods

2:20 PM - 3:50 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, July 23, 2026

Weather Forecast

Sunny
74.6°F
59.8°F
66.7°F
62%
0 in
4%
0%
9.6 mph
8.5


Air Quality

AQI: 1 - Good
PM2.5: 3.38 μg/m3
PM10: 3.46 μg/m3
Carbon Monoxide: 143.29 μg/m3
Nitrogen Dioxide: 5.38 μg/m3
Sulphur Dioxide: 0.38 μg/m3
Ozone: 73.83 μg/m3

Astronomical

Sunrise: 5:35 AM
Sun Transit: 12:54 AM
Sunset: 8:14 PM
Daylight: 14 hrs 40 mins
Moonrise: 3:53 PM
Moon Transit: 8:26 PM
Moonset: 12:21 AM
Moon Phase: First Quarter
Moon Illumination: 66.1%

Best Times for Fishing or Hunting

Major Periods

10:00 AM - 12:30 AM
7:56 PM - 10:26 PM

Minor Periods

3:23 PM - 4:53 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Friday, July 24, 2026

Weather Forecast

Sunny
74.4°F
58.9°F
67°F
68%
0 in
5%
0%
10.1 mph
8.3


Air Quality

AQI: 1 - Good
PM2.5: 7.68 μg/m3
PM10: 8.26 μg/m3
Carbon Monoxide: 146.17 μg/m3
Nitrogen Dioxide: 7.29 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 86.67 μg/m3

Astronomical

Sunrise: 5:36 AM
Sun Transit: 12:54 AM
Sunset: 8:13 PM
Daylight: 14 hrs 38 mins
Moonrise: 4:55 PM
Moon Transit: 9:15 PM
Moonset: 12:54 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

10:49 AM - 1:19 PM
8:45 PM - 11:15 PM

Minor Periods

4:25 PM - 5:55 PM
12:24 AM - 1:54 AM

Action Rating: 2 out of 5

Saturday, July 25, 2026

Weather Forecast

Sunny
75.4°F
59.2°F
67.1°F
67%
0 in
5%
0%
11 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 8.88 μg/m3
PM10: 12.19 μg/m3
Carbon Monoxide: 166 μg/m3
Nitrogen Dioxide: 5.09 μg/m3
Sulphur Dioxide: 0.76 μg/m3
Ozone: 90.22 μg/m3

Astronomical

Sunrise: 5:37 AM
Sun Transit: 12:54 AM
Sunset: 8:13 PM
Daylight: 14 hrs 36 mins
Moonrise: 5:51 PM
Moon Transit: 10:07 PM
Moonset: 1:35 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.2%

Best Times for Fishing or Hunting

Major Periods

11:39 AM - 2:09 PM
12:00 AM - 12:00 AM

Minor Periods

5:21 PM - 6:51 PM
1:05 AM - 2:35 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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