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

45°F
Sunny
Sunny
38.4°F
49.4°F
49%
SSW 14.1 mph
21.1 mph
45.4°F
27.7°F
0 in
0%
9 mi
1031 mbar
0.2

Five Day Weather Forecast

Sunny
Sun
H: 51°F
L: 26°F
Patchy rain nearby
Mon
H: 54°F
L: 37°F
Thundery outbreaks in nearby
Tue
H: 56°F
L: 45°F
Patchy rain nearby
Wed
H: 57°F
L: 48°F
Moderate rain
Thu
H: 47°F
L: 40°F

Air Quality

AQI: 1 - Good
PM2.5: 8.15 μg/m3
PM10: 10.85 μg/m3
Carbon Monoxide: 202.85 μg/m3
Nitrogen Dioxide: 2.95 μg/m3
Sulphur Dioxide: 1.75 μg/m3
Ozone: 109 μg/m3

Astronomical

Sunrise: 6:37 AM
Sun Transit: 12:00 AM
Sunset: 7:10 PM
Daylight: 12 hrs 34 mins
Moonrise: 3:46 PM
Moon Transit: 10:42 PM
Moonset: 5:01 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.2%

Best Times for Fishing or Hunting

Major Periods

12:16 AM - 2:46 PM
12:00 AM - 12:00 AM

Minor Periods

3:16 PM - 4:46 PM
4:31 AM - 6:01 AM

Action Rating: 2 out of 5

Special Weather Statement issued March 29 at 12:17AM EDT by NWS Upton NY

Effective: Sun March 29, 2026, 12:17 AM
Expires: Sun March 29, 2026, 6:00 PM

Dry and breezy conditions expected today. The combination of afternoon RH values around 30 to 40 percent and a southwesterly flow increasing to 20 to 25 mph gusts will result in an elevated risk of fire spread. Use caution when handling any potential ignition sources, including machinery, cigarettes and matches. Any fires that ignite will have the potential to spread quickly. The forecast considers meteorological, fuel and land conditions and has been developed in coordination with state fire and land management officials.


Special Weather Statement issued March 29 at 5:43AM EDT by NWS Boston/Norton MA

Effective: Sun March 29, 2026, 5:43 AM
Expires: Sun March 29, 2026, 7:00 PM

A dry but breezy day is forecast today, with relative humidities this afternoon expected to drop into the 30 to 40 percent range and southwesterly wind gusts between 25 and 30 mph. When combined with the lack of recent significant rainfall, elevated fire weather potential will exist today. Use caution when handling and disposing of ignition sources such as matches and cigarettes.


Special Weather Statement issued March 29 at 5:43AM EDT by NWS Boston/Norton MA

Effective: Sun March 29, 2026, 5:43 AM
Expires: Sun March 29, 2026, 7:00 PM

A dry but breezy day is forecast today, with relative humidities this afternoon expected to drop into the 25 to 35 percent range and southwesterly wind gusts between 25 and 30 mph. When combined with the lack of recent significant rainfall, elevated fire weather potential will exist today. Use caution when handling and disposing of ignition sources such as matches and cigarettes.


Sunday, March 29, 2026

Weather Forecast

Sunny
51.4°F
26.4°F
39.1°F
57%
0 in
0%
0%
15.2 mph
1.1


Air Quality

AQI: 1 - Good
PM2.5: 7.3 μg/m3
PM10: 9.22 μg/m3
Carbon Monoxide: 230.97 μg/m3
Nitrogen Dioxide: 4.39 μg/m3
Sulphur Dioxide: 2.01 μg/m3
Ozone: 96.6 μg/m3

Astronomical

Sunrise: 6:37 AM
Sun Transit: 12:00 AM
Sunset: 7:10 PM
Daylight: 12 hrs 34 mins
Moonrise: 3:46 PM
Moon Transit: 10:42 PM
Moonset: 5:01 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.2%

Best Times for Fishing or Hunting

Major Periods

12:16 AM - 2:46 PM
12:00 AM - 12:00 AM

Minor Periods

3:16 PM - 4:46 PM
4:31 AM - 6:01 AM

Action Rating: 2 out of 5

Monday, March 30, 2026

Weather Forecast

Patchy rain nearby
54°F
36.7°F
45.1°F
84%
0.02 in
82%
0%
17.9 mph
0.9


Air Quality

AQI: 1 - Good
PM2.5: 10.12 μg/m3
PM10: 12.38 μg/m3
Carbon Monoxide: 208.29 μg/m3
Nitrogen Dioxide: 6.87 μg/m3
Sulphur Dioxide: 2.11 μg/m3
Ozone: 99.64 μg/m3

Astronomical

Sunrise: 6:35 AM
Sun Transit: 12:00 AM
Sunset: 7:11 PM
Daylight: 12 hrs 36 mins
Moonrise: 4:55 PM
Moon Transit: 11:26 PM
Moonset: 5:25 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 93.0%

Best Times for Fishing or Hunting

Major Periods

1:02 PM - 3:32 PM
12:00 AM - 12:00 AM

Minor Periods

4:25 PM - 5:55 PM
4:55 AM - 6:25 AM

Action Rating: 3 out of 5

Tuesday, March 31, 2026

Weather Forecast

Thundery outbreaks in nearby
55.8°F
45.3°F
49°F
93%
0 in
0%
0%
16.6 mph
1.1


Air Quality

AQI: 1 - Good
PM2.5: 10.02 μg/m3
PM10: 12.63 μg/m3
Carbon Monoxide: 203.53 μg/m3
Nitrogen Dioxide: 7.11 μg/m3
Sulphur Dioxide: 1.83 μg/m3
Ozone: 95.56 μg/m3

Astronomical

Sunrise: 6:33 AM
Sun Transit: 12:00 AM
Sunset: 7:12 PM
Daylight: 12 hrs 39 mins
Moonrise: 6:02 PM
Moon Transit: 12:00 AM
Moonset: 5:46 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:45 PM - 4:15 PM

Minor Periods

5:32 PM - 7:02 PM
5:16 AM - 6:46 AM

Action Rating: 4 out of 5

Wednesday, April 1, 2026

Weather Forecast

Patchy rain nearby
56.7°F
47.7°F
50.9°F
91%
0.04 in
70%
0%
18.6 mph
1.2


Air Quality

AQI: 1 - Good
PM2.5: 10.18 μg/m3
PM10: 13.05 μg/m3
Carbon Monoxide: 203.56 μg/m3
Nitrogen Dioxide: 4.55 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 99.96 μg/m3

Astronomical

Sunrise: 6:32 AM
Sun Transit: 12:00 AM
Sunset: 7:13 PM
Daylight: 12 hrs 42 mins
Moonrise: 7:07 PM
Moon Transit: 12:09 AM
Moonset: 6:07 AM
Moon Phase: Full
Moon Illumination: 99.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:28 PM - 4:58 PM

Minor Periods

6:37 PM - 8:07 PM
5:37 AM - 7:07 AM

Action Rating: 3 out of 5

Thursday, April 2, 2026

Weather Forecast

Moderate rain
46.6°F
40.4°F
45°F
91%
0.28 in
88%
0%
15 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 3.34 μg/m3
PM10: 3.5 μg/m3
Carbon Monoxide: 203.41 μg/m3
Nitrogen Dioxide: 8.09 μg/m3
Sulphur Dioxide: 1.83 μg/m3
Ozone: 81.38 μg/m3

Astronomical

Sunrise: 6:30 AM
Sun Transit: 12:00 AM
Sunset: 7:15 PM
Daylight: 12 hrs 45 mins
Moonrise: 8:12 PM
Moon Transit: 12:51 AM
Moonset: 6:27 AM
Moon Phase: Full
Moon Illumination: 99.5%

Best Times for Fishing or Hunting

Major Periods

12:21 AM - 2:51 AM
3:10 PM - 5:40 PM

Minor Periods

7:42 PM - 9:12 PM
5:57 AM - 7:27 AM

Action Rating: 4 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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