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

68.5°F
Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
68.5°F
77.4°F
96%
SSW 12.8 mph
25 mph
73.2°F
71.2°F
0.1 in
100%
1 mi
1006 mbar
0

Five Day Weather Forecast

Sunny
Sat
H: 86°F
L: 64°F
Sunny
Sun
H: 79°F
L: 65°F
Sunny
Mon
H: 76°F
L: 60°F
Sunny
Tue
H: 75°F
L: 66°F
Patchy rain nearby
Wed
H: 80°F
L: 69°F

Air Quality

AQI: 1 - Good
PM2.5: 21.1 μg/m3
PM10: 26.3 μg/m3
Carbon Monoxide: 134 μg/m3
Nitrogen Dioxide: 2.8 μg/m3
Sulphur Dioxide: 0.5 μg/m3
Ozone: 119 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

Small Craft Advisory issued July 18 at 2:32AM EDT until July 19 at 12:00AM EDT by NWS Upton NY

Effective: Sat July 18, 2026, 2:32 AM
Expires: Sat July 18, 2026, 5:00 PM

* WHAT...Southwest winds 10 to 20 kt with gusts up to 25 kt. * WHERE...Long Island Sound east of Port Jefferson and New Haven, Peconic and Gardiners Bays, and South Shore Bays from Jones Inlet through Shinnecock Bay. * WHEN...From noon today to midnight EDT tonight. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Saturday, July 18, 2026

Weather Forecast

Sunny
85.6°F
63.7°F
72°F
85%
0.79 in
80%
0%
20.8 mph
3.8


Air Quality

AQI: 2 - Moderate
PM2.5: 32.42 μg/m3
PM10: 37 μg/m3
Carbon Monoxide: 143.58 μg/m3
Nitrogen Dioxide: 2.97 μg/m3
Sulphur Dioxide: 0.6 μg/m3
Ozone: 115.79 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
79.1°F
64.9°F
72.1°F
66%
0.06 in
57%
0%
21 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 7.7 μg/m3
PM10: 8.05 μg/m3
Carbon Monoxide: 162.08 μg/m3
Nitrogen Dioxide: 3.89 μg/m3
Sulphur Dioxide: 0.55 μg/m3
Ozone: 96.96 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

Monday, July 20, 2026

Weather Forecast

Sunny
76.4°F
59.6°F
68.2°F
56%
0 in
3%
0%
10.5 mph
8.3


Air Quality

AQI: 1 - Good
PM2.5: 7.48 μg/m3
PM10: 8.76 μg/m3
Carbon Monoxide: 149.67 μg/m3
Nitrogen Dioxide: 5.75 μg/m3
Sulphur Dioxide: 0.39 μg/m3
Ozone: 87.5 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 12:54 AM
Sunset: 8:17 PM
Daylight: 14 hrs 45 mins
Moonrise: 12:40 AM
Moon Transit: 6:08 PM
Moonset: 12:06 AM
Moon Phase: Waxing Crescent
Moon Illumination: 32.7%

Best Times for Fishing or Hunting

Major Periods

7:44 AM - 10:14 AM
5:38 PM - 8:08 PM

Minor Periods

12:10 AM - 1:40 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Tuesday, July 21, 2026

Weather Forecast

Sunny
74.9°F
65.7°F
70.4°F
85%
0.41 in
82%
0%
14.1 mph
6.9


Air Quality

AQI: 1 - Good
PM2.5: 10.75 μg/m3
PM10: 15.71 μg/m3
Carbon Monoxide: 146.73 μg/m3
Nitrogen Dioxide: 3.15 μg/m3
Sulphur Dioxide: 0.51 μg/m3
Ozone: 92.13 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
80.3°F
69.1°F
74.2°F
80%
0.11 in
70%
0%
19.5 mph
7.1


Air Quality

AQI: 1 - Good
PM2.5: 5.93 μg/m3
PM10: 8.72 μg/m3
Carbon Monoxide: 136.56 μg/m3
Nitrogen Dioxide: 1.94 μg/m3
Sulphur Dioxide: 0.28 μg/m3
Ozone: 82 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

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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