Water Temperature of the Thames River in Groton, CT

Current Water Temperature

45.5°F

Measurement Time: Monday, April 13, 2026, 4:45 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

48.9°F
Clear
Clear
45.4°F
48.4°F
93%
NNE 8.1 mph
13.7 mph
46°F
45.2°F
0 in
0%
9 mi
1017 mbar
0

Five Day Weather Forecast

Partly Cloudy
Sat
H: 65°F
L: 48°F
Patchy rain nearby
Sun
H: 51°F
L: 42°F
Patchy rain nearby
Mon
H: 46°F
L: 38°F
Sunny
Tue
H: 47°F
L: 34°F
Patchy rain nearby
Wed
H: 60°F
L: 43°F

Air Quality

AQI: 1 - Good
PM2.5: 8.95 μg/m3
PM10: 9.75 μg/m3
Carbon Monoxide: 205.85 μg/m3
Nitrogen Dioxide: 8.75 μg/m3
Sulphur Dioxide: 1.95 μg/m3
Ozone: 73 μg/m3

Astronomical

Sunrise: 6:04 AM
Sun Transit: 12:47 AM
Sunset: 7:32 PM
Daylight: 13 hrs 28 mins
Moonrise: 6:20 AM
Moon Transit: 1:49 PM
Moonset: 9:33 PM
Moon Phase: New
Moon Illumination: 1.2%

Best Times for Fishing or Hunting

Major Periods

3:19 AM - 5:49 AM
1:19 PM - 3:49 PM

Minor Periods

9:03 PM - 10:33 PM
5:50 AM - 7:20 AM

Action Rating: 5 out of 5

Coastal Flood Statement issued April 17 at 10:17PM EDT until April 19 at 2:00AM EDT by NWS Upton NY

Effective: Fri April 17, 2026, 10:17 PM
Expires: Sat April 18, 2026, 6:00 AM

* WHAT...Up to one foot of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...Southern New Haven County. * WHEN...From Saturday evening into late Saturday night. * IMPACTS...Brief minor flooding of the more vulnerable locations near the waterfront and shoreline.

Do not drive through flooded roadways.
Saturday, April 18, 2026

Weather Forecast

Partly Cloudy
64.9°F
47.6°F
54.7°F
81%
0 in
0%
0%
11.2 mph
1.4


Air Quality

AQI: 1 - Good
PM2.5: 10.07 μg/m3
PM10: 11.61 μg/m3
Carbon Monoxide: 213.05 μg/m3
Nitrogen Dioxide: 9.55 μg/m3
Sulphur Dioxide: 1.85 μg/m3
Ozone: 72.08 μg/m3

Astronomical

Sunrise: 6:04 AM
Sun Transit: 12:47 AM
Sunset: 7:32 PM
Daylight: 13 hrs 28 mins
Moonrise: 6:20 AM
Moon Transit: 1:49 PM
Moonset: 9:33 PM
Moon Phase: New
Moon Illumination: 1.2%

Best Times for Fishing or Hunting

Major Periods

3:19 AM - 5:49 AM
1:19 PM - 3:49 PM

Minor Periods

9:03 PM - 10:33 PM
5:50 AM - 7:20 AM

Action Rating: 5 out of 5

Sunday, April 19, 2026

Weather Forecast

Patchy rain nearby
50.5°F
42.1°F
47.1°F
88%
0.17 in
87%
0%
16.8 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 8.75 μg/m3
PM10: 11.56 μg/m3
Carbon Monoxide: 182.97 μg/m3
Nitrogen Dioxide: 5.71 μg/m3
Sulphur Dioxide: 1.41 μg/m3
Ozone: 85.04 μg/m3

Astronomical

Sunrise: 6:03 AM
Sun Transit: 12:47 AM
Sunset: 7:33 PM
Daylight: 13 hrs 30 mins
Moonrise: 6:58 AM
Moon Transit: 2:50 PM
Moonset: 10:53 PM
Moon Phase: Waxing Crescent
Moon Illumination: 4.9%

Best Times for Fishing or Hunting

Major Periods

4:18 AM - 6:48 AM
2:20 PM - 4:50 PM

Minor Periods

10:23 PM - 11:53 PM
6:28 AM - 7:58 AM

Action Rating: 3 out of 5

Monday, April 20, 2026

Weather Forecast

Patchy rain nearby
46.1°F
38°F
42.3°F
68%
0.06 in
86%
0%
12.3 mph
0.9


Air Quality

AQI: 1 - Good
PM2.5: 6.31 μg/m3
PM10: 6.67 μg/m3
Carbon Monoxide: 181.77 μg/m3
Nitrogen Dioxide: 7.22 μg/m3
Sulphur Dioxide: 1.93 μg/m3
Ozone: 84.2 μg/m3

Astronomical

Sunrise: 6:01 AM
Sun Transit: 12:47 AM
Sunset: 7:34 PM
Daylight: 13 hrs 33 mins
Moonrise: 7:46 AM
Moon Transit: 3:54 PM
Moonset: 12:07 PM
Moon Phase: Waxing Crescent
Moon Illumination: 10.8%

Best Times for Fishing or Hunting

Major Periods

5:21 AM - 7:51 AM
3:24 PM - 5:54 PM

Minor Periods

12:00 AM - 12:00 AM
7:16 AM - 8:46 AM

Action Rating: 2 out of 5

Tuesday, April 21, 2026

Weather Forecast

Sunny
46.9°F
33.9°F
41.7°F
58%
0 in
0%
0%
15.4 mph
1.5


Air Quality

AQI: 1 - Good
PM2.5: 5.4 μg/m3
PM10: 5.95 μg/m3
Carbon Monoxide: 173.3 μg/m3
Nitrogen Dioxide: 5.86 μg/m3
Sulphur Dioxide: 2.23 μg/m3
Ozone: 91.36 μg/m3

Astronomical

Sunrise: 6:00 AM
Sun Transit: 12:47 AM
Sunset: 7:35 PM
Daylight: 13 hrs 35 mins
Moonrise: 8:47 AM
Moon Transit: 5:00 PM
Moonset: 12:07 AM
Moon Phase: Waxing Crescent
Moon Illumination: 18.8%

Best Times for Fishing or Hunting

Major Periods

6:26 AM - 8:56 AM
4:30 PM - 7:00 PM

Minor Periods

8:17 AM - 9:47 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Wednesday, April 22, 2026

Weather Forecast

Patchy rain nearby
59.8°F
43.2°F
48.6°F
75%
0.06 in
89%
0%
17.7 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 7.16 μg/m3
PM10: 10.15 μg/m3
Carbon Monoxide: 162.6 μg/m3
Nitrogen Dioxide: 1.98 μg/m3
Sulphur Dioxide: 1.43 μg/m3
Ozone: 106.46 μg/m3

Astronomical

Sunrise: 5:58 AM
Sun Transit: 12:46 AM
Sunset: 7:36 PM
Daylight: 13 hrs 38 mins
Moonrise: 9:56 AM
Moon Transit: 6:01 PM
Moonset: 1:09 AM
Moon Phase: Waxing Crescent
Moon Illumination: 28.4%

Best Times for Fishing or Hunting

Major Periods

7:30 AM - 10:00 AM
5:31 PM - 8:01 PM

Minor Periods

9:26 AM - 10:56 AM
12:39 AM - 2:09 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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