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

30°F
Clear
Clear
20.8°F
30.7°F
51%
N 11 mph
14.9 mph
23.5°F
18.5°F
0 in
0%
9 mi
1033 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 51°F
L: 31°F
Partly Cloudy
Thu
H: 42°F
L: 35°F
Overcast
Fri
H: 54°F
L: 37°F
Sunny
Sat
H: 56°F
L: 44°F
Sunny
Sun
H: 49°F
L: 38°F

Air Quality

AQI: 1 - Good
PM2.5: 3.45 μg/m3
PM10: 4.15 μg/m3
Carbon Monoxide: 173.85 μg/m3
Nitrogen Dioxide: 3.45 μg/m3
Sulphur Dioxide: 1.45 μg/m3
Ozone: 92 μg/m3

Astronomical

Sunrise: 6:20 AM
Sun Transit: 12:50 AM
Sunset: 7:21 PM
Daylight: 13 hrs 1 mins
Moonrise: 1:21 AM
Moon Transit: 5:36 AM
Moonset: 9:52 AM
Moon Phase: Last Quarter
Moon Illumination: 53.2%

Best Times for Fishing or Hunting

Major Periods

5:06 AM - 7:36 AM
8:00 PM - 10:30 PM

Minor Periods

9:22 AM - 10:52 AM
12:51 AM - 2:21 AM

Action Rating: 2 out of 5

Special Weather Statement issued April 7 at 4:27PM EDT by NWS Boston/Norton MA

Effective: Tue April 7, 2026, 4:27 PM
Expires: Wed April 8, 2026, 4:00 AM

Despite relatively light winds Wednesday averaging 5 to 10 mph, it will become quite dry with afternoon relative humidities dropping to 15 to 25 percent away from the south coast. When combined with the lack of recent significant rainfall and exposed fine fuels and leaf litter, elevated fire weather potential will exist on Wednesday.


Wednesday, April 8, 2026

Weather Forecast

Sunny
50.7°F
30.6°F
38.6°F
51%
0 in
0%
0%
16.3 mph
1.3


Air Quality

AQI: 1 - Good
PM2.5: 4.3 μg/m3
PM10: 5.16 μg/m3
Carbon Monoxide: 182.41 μg/m3
Nitrogen Dioxide: 4.12 μg/m3
Sulphur Dioxide: 1.68 μg/m3
Ozone: 91.72 μg/m3

Astronomical

Sunrise: 6:20 AM
Sun Transit: 12:50 AM
Sunset: 7:21 PM
Daylight: 13 hrs 1 mins
Moonrise: 1:21 AM
Moon Transit: 5:36 AM
Moonset: 9:52 AM
Moon Phase: Last Quarter
Moon Illumination: 53.2%

Best Times for Fishing or Hunting

Major Periods

5:06 AM - 7:36 AM
8:00 PM - 10:30 PM

Minor Periods

9:22 AM - 10:52 AM
12:51 AM - 2:21 AM

Action Rating: 2 out of 5

Thursday, April 9, 2026

Weather Forecast

Partly Cloudy
42.4°F
34.7°F
37.9°F
81%
0 in
0%
0%
9.6 mph
1.4


Air Quality

AQI: 1 - Good
PM2.5: 8.32 μg/m3
PM10: 12.54 μg/m3
Carbon Monoxide: 176.21 μg/m3
Nitrogen Dioxide: 3.32 μg/m3
Sulphur Dioxide: 1.63 μg/m3
Ozone: 101.48 μg/m3

Astronomical

Sunrise: 6:18 AM
Sun Transit: 12:49 AM
Sunset: 7:22 PM
Daylight: 13 hrs 4 mins
Moonrise: 2:09 AM
Moon Transit: 6:27 AM
Moonset: 10:49 AM
Moon Phase: Last Quarter
Moon Illumination: 41.9%

Best Times for Fishing or Hunting

Major Periods

5:57 AM - 8:27 AM
8:51 PM - 11:21 PM

Minor Periods

10:19 AM - 11:49 AM
1:39 AM - 3:09 AM

Action Rating: 3 out of 5

Friday, April 10, 2026

Weather Forecast

Overcast
54.3°F
36.5°F
42.3°F
86%
0 in
0%
0%
7.8 mph
1.5


Air Quality

AQI: 1 - Good
PM2.5: 13.09 μg/m3
PM10: 18.22 μg/m3
Carbon Monoxide: 170.21 μg/m3
Nitrogen Dioxide: 5.11 μg/m3
Sulphur Dioxide: 1.85 μg/m3
Ozone: 89.4 μg/m3

Astronomical

Sunrise: 6:17 AM
Sun Transit: 12:49 AM
Sunset: 7:23 PM
Daylight: 13 hrs 6 mins
Moonrise: 2:49 AM
Moon Transit: 7:18 AM
Moonset: 11:52 AM
Moon Phase: Last Quarter
Moon Illumination: 31.0%

Best Times for Fishing or Hunting

Major Periods

6:48 AM - 9:18 AM
12:00 AM - 12:00 AM

Minor Periods

11:22 AM - 12:52 AM
2:19 AM - 3:49 AM

Action Rating: 2 out of 5

Saturday, April 11, 2026

Weather Forecast

Sunny
56°F
44.2°F
49.4°F
63%
0 in
0%
0%
17 mph
1.5


Air Quality

AQI: 1 - Good
PM2.5: 8.37 μg/m3
PM10: 9.87 μg/m3
Carbon Monoxide: 182.13 μg/m3
Nitrogen Dioxide: 8.57 μg/m3
Sulphur Dioxide: 2.18 μg/m3
Ozone: 85.52 μg/m3

Astronomical

Sunrise: 6:15 AM
Sun Transit: 12:49 AM
Sunset: 7:24 PM
Daylight: 13 hrs 9 mins
Moonrise: 3:22 AM
Moon Transit: 8:06 AM
Moonset: 12:59 AM
Moon Phase: Last Quarter
Moon Illumination: 21.1%

Best Times for Fishing or Hunting

Major Periods

7:36 AM - 10:06 AM
12:00 AM - 12:00 AM

Minor Periods

12:29 AM - 1:59 PM
2:52 AM - 4:22 AM

Action Rating: 2 out of 5

Sunday, April 12, 2026

Weather Forecast

Sunny
49.3°F
37.6°F
43.3°F
62%
0 in
0%
0%
14.3 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 5.53 μg/m3
PM10: 5.75 μg/m3
Carbon Monoxide: 201.29 μg/m3
Nitrogen Dioxide: 9.03 μg/m3
Sulphur Dioxide: 1.94 μg/m3
Ozone: 80.38 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

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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