Water Temperature of the Thames River in Groton, CT

Current Water Temperature

37.0°F

Measurement Time: Tuesday, March 10, 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

34°F
Sunny
Sunny
29.2°F
39.2°F
72%
N 5.1 mph
8.7 mph
37.8°F
21.9°F
0 in
0%
9 mi
1033 mbar
0.2

Five Day Weather Forecast

Sunny
Sun
H: 58°F
L: 36°F
Patchy rain nearby
Mon
H: 53°F
L: 44°F
Partly Cloudy
Tue
H: 67°F
L: 52°F
Patchy rain nearby
Wed
H: 67°F
L: 52°F
Patchy rain nearby
Thu
H: 69°F
L: 53°F

Air Quality

AQI: 1 - Good
PM2.5: 8.85 μg/m3
PM10: 10.05 μg/m3
Carbon Monoxide: 177.85 μg/m3
Nitrogen Dioxide: 8.25 μg/m3
Sulphur Dioxide: 2.15 μg/m3
Ozone: 85 μg/m3

Astronomical

Sunrise: 6:14 AM
Sun Transit: 12:49 AM
Sunset: 7:25 PM
Daylight: 13 hrs 12 mins
Moonrise: 3:50 AM
Moon Transit: 8:54 AM
Moonset: 2:07 PM
Moon Phase: Waning Crescent
Moon Illumination: 12.6%

Best Times for Fishing or Hunting

Major Periods

8:24 AM - 10:54 AM
12:00 AM - 12:00 AM

Minor Periods

1:37 PM - 3:07 PM
3:20 AM - 4:50 AM

Action Rating: 2 out of 5

Frost Advisory issued April 11 at 1:23PM EDT until April 12 at 9:00AM EDT by NWS Upton NY

Effective: Sat April 11, 2026, 1:23 PM
Expires: Sun April 12, 2026, 7:45 AM

* WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...In Connecticut, Southern Middlesex and Southern New London Counties. In New Jersey, Western Bergen and Western Passaic Counties. In New York, Northeast Suffolk, Northern Westchester, Rockland, and Southeast Suffolk Counties. * WHEN...From midnight tonight to 9 AM EDT Sunday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.
Sunday, April 12, 2026

Weather Forecast

Sunny
58.1°F
36.3°F
46.6°F
48%
0 in
0%
0%
12.1 mph
1.6


Air Quality

AQI: 1 - Good
PM2.5: 7.79 μg/m3
PM10: 9.09 μg/m3
Carbon Monoxide: 188.85 μg/m3
Nitrogen Dioxide: 7.44 μg/m3
Sulphur Dioxide: 1.85 μg/m3
Ozone: 86.52 μg/m3

Astronomical

Sunrise: 6:14 AM
Sun Transit: 12:49 AM
Sunset: 7:25 PM
Daylight: 13 hrs 12 mins
Moonrise: 3:50 AM
Moon Transit: 8:54 AM
Moonset: 2:07 PM
Moon Phase: Waning Crescent
Moon Illumination: 12.6%

Best Times for Fishing or Hunting

Major Periods

8:24 AM - 10:54 AM
12:00 AM - 12:00 AM

Minor Periods

1:37 PM - 3:07 PM
3:20 AM - 4:50 AM

Action Rating: 2 out of 5

Monday, April 13, 2026

Weather Forecast

Patchy rain nearby
53.2°F
43.9°F
49.3°F
92%
0.12 in
89%
0%
18.6 mph
0.9


Air Quality

AQI: 1 - Good
PM2.5: 10.58 μg/m3
PM10: 14.15 μg/m3
Carbon Monoxide: 169.65 μg/m3
Nitrogen Dioxide: 4.04 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 106.64 μg/m3

Astronomical

Sunrise: 6:12 AM
Sun Transit: 12:48 AM
Sunset: 7:26 PM
Daylight: 13 hrs 14 mins
Moonrise: 4:15 AM
Moon Transit: 9:40 AM
Moonset: 3:15 PM
Moon Phase: Waning Crescent
Moon Illumination: 6.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:10 AM - 11:40 AM

Minor Periods

2:45 PM - 4:15 PM
3:45 AM - 5:15 AM

Action Rating: 2 out of 5

Tuesday, April 14, 2026

Weather Forecast

Partly Cloudy
67.3°F
52°F
57.5°F
87%
0 in
0%
0%
10.3 mph
1.7


Air Quality

AQI: 2 - Moderate
PM2.5: 15.83 μg/m3
PM10: 17.04 μg/m3
Carbon Monoxide: 195.97 μg/m3
Nitrogen Dioxide: 15.57 μg/m3
Sulphur Dioxide: 3.98 μg/m3
Ozone: 83.44 μg/m3

Astronomical

Sunrise: 6:10 AM
Sun Transit: 12:48 AM
Sunset: 7:27 PM
Daylight: 13 hrs 17 mins
Moonrise: 4:38 AM
Moon Transit: 10:25 AM
Moonset: 4:26 PM
Moon Phase: Waning Crescent
Moon Illumination: 1.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 2:30 AM
9:55 AM - 12:25 AM

Minor Periods

3:56 PM - 5:26 PM
4:08 AM - 5:38 AM

Action Rating: 2 out of 5

Wednesday, April 15, 2026

Weather Forecast

Patchy rain nearby
66.6°F
52°F
58.6°F
81%
0.16 in
64%
0%
17 mph
1.7


Air Quality

AQI: 2 - Moderate
PM2.5: 19.12 μg/m3
PM10: 20.79 μg/m3
Carbon Monoxide: 206.79 μg/m3
Nitrogen Dioxide: 18.97 μg/m3
Sulphur Dioxide: 3.4 μg/m3
Ozone: 79.92 μg/m3

Astronomical

Sunrise: 6:09 AM
Sun Transit: 12:48 AM
Sunset: 7:28 PM
Daylight: 13 hrs 20 mins
Moonrise: 5:00 AM
Moon Transit: 11:12 AM
Moonset: 5:37 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

11:03 AM - 1:33 PM
10:42 AM - 1:12 PM

Minor Periods

5:07 PM - 6:37 PM
4:30 AM - 6:00 AM

Action Rating: 3 out of 5

Thursday, April 16, 2026

Weather Forecast

Patchy rain nearby
68.6°F
53.4°F
59.9°F
87%
0.03 in
89%
0%
12.8 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 14.37 μg/m3
PM10: 17.4 μg/m3
Carbon Monoxide: 226.31 μg/m3
Nitrogen Dioxide: 9.91 μg/m3
Sulphur Dioxide: 2.19 μg/m3
Ozone: 82.85 μg/m3

Astronomical

Sunrise: 6:07 AM
Sun Transit: 12:48 AM
Sunset: 7:30 PM
Daylight: 13 hrs 22 mins
Moonrise: 5:23 AM
Moon Transit: 12:00 AM
Moonset: 6:53 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

1:34 AM - 4:04 AM
11:30 AM - 2:00 PM

Minor Periods

6:23 PM - 7:53 PM
4:53 AM - 6:23 AM

Action Rating: 5 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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