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
Light rain
Light rain
43.6°F
47.3°F
97%
S 3.4 mph
7 mph
45.5°F
47°F
0 in
100%
6 mi
1008 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Sun
H: 48°F
L: 37°F
Heavy rain
Mon
H: 41°F
L: 35°F
Sunny
Tue
H: 46°F
L: 30°F
Overcast
Wed
H: 45°F
L: 35°F
Partly Cloudy
Thu
H: 51°F
L: 41°F

Air Quality

AQI: 1 - Good
PM2.5: 19.15 μg/m3
PM10: 22.55 μg/m3
Carbon Monoxide: 298.85 μg/m3
Nitrogen Dioxide: 6.05 μg/m3
Sulphur Dioxide: 1.75 μg/m3
Ozone: 138 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 12:00 AM
Sunset: 7:03 PM
Daylight: 12 hrs 14 mins
Moonrise: 8:23 AM
Moon Transit: 4:02 PM
Moonset: 11:55 PM
Moon Phase: Waxing Crescent
Moon Illumination: 14.9%

Best Times for Fishing or Hunting

Major Periods

5:32 AM - 8:02 AM
3:32 PM - 6:02 PM

Minor Periods

12:00 AM - 12:00 AM
7:53 AM - 9:23 AM

Action Rating: 2 out of 5

Sunday, March 22, 2026

Weather Forecast

Patchy rain nearby
47.5°F
37°F
43.2°F
90%
0.04 in
89%
0%
15.4 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 10.03 μg/m3
PM10: 13.34 μg/m3
Carbon Monoxide: 230.21 μg/m3
Nitrogen Dioxide: 6.37 μg/m3
Sulphur Dioxide: 1.52 μg/m3
Ozone: 98.4 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 12:00 AM
Sunset: 7:03 PM
Daylight: 12 hrs 14 mins
Moonrise: 8:23 AM
Moon Transit: 4:02 PM
Moonset: 11:55 PM
Moon Phase: Waxing Crescent
Moon Illumination: 14.9%

Best Times for Fishing or Hunting

Major Periods

5:32 AM - 8:02 AM
3:32 PM - 6:02 PM

Minor Periods

12:00 AM - 12:00 AM
7:53 AM - 9:23 AM

Action Rating: 2 out of 5

Monday, March 23, 2026

Weather Forecast

Heavy rain
40.6°F
34.7°F
39.4°F
85%
1.13 in
88%
0%
13.6 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 7.81 μg/m3
PM10: 8.69 μg/m3
Carbon Monoxide: 240.65 μg/m3
Nitrogen Dioxide: 8.75 μg/m3
Sulphur Dioxide: 1.93 μg/m3
Ozone: 95.88 μg/m3

Astronomical

Sunrise: 6:47 AM
Sun Transit: 12:00 AM
Sunset: 7:04 PM
Daylight: 12 hrs 17 mins
Moonrise: 9:03 AM
Moon Transit: 5:02 PM
Moonset: 12:55 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.8%

Best Times for Fishing or Hunting

Major Periods

6:31 AM - 9:01 AM
4:32 PM - 7:02 PM

Minor Periods

8:33 AM - 10:03 AM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Tuesday, March 24, 2026

Weather Forecast

Sunny
46.4°F
30°F
37.7°F
59%
0 in
0%
0%
15 mph
0.9


Air Quality

AQI: 1 - Good
PM2.5: 4.51 μg/m3
PM10: 5.11 μg/m3
Carbon Monoxide: 188.65 μg/m3
Nitrogen Dioxide: 5.34 μg/m3
Sulphur Dioxide: 1.85 μg/m3
Ozone: 98.36 μg/m3

Astronomical

Sunrise: 6:45 AM
Sun Transit: 12:00 AM
Sunset: 7:05 PM
Daylight: 12 hrs 20 mins
Moonrise: 9:54 AM
Moon Transit: 6:05 PM
Moonset: 1:11 AM
Moon Phase: Waxing Crescent
Moon Illumination: 34.0%

Best Times for Fishing or Hunting

Major Periods

7:33 AM - 10:03 AM
5:35 PM - 8:05 PM

Minor Periods

9:24 AM - 10:54 AM
12:41 AM - 2:11 AM

Action Rating: 2 out of 5

Wednesday, March 25, 2026

Weather Forecast

Overcast
45°F
34.9°F
39.5°F
73%
0 in
0%
0%
16.8 mph
0.9


Air Quality

AQI: 1 - Good
PM2.5: 9.9 μg/m3
PM10: 11.25 μg/m3
Carbon Monoxide: 195.06 μg/m3
Nitrogen Dioxide: 13.87 μg/m3
Sulphur Dioxide: 2.95 μg/m3
Ozone: 73.96 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 12:00 AM
Sunset: 7:06 PM
Daylight: 12 hrs 23 mins
Moonrise: 10:56 AM
Moon Transit: 7:07 PM
Moonset: 2:19 AM
Moon Phase: First Quarter
Moon Illumination: 45.1%

Best Times for Fishing or Hunting

Major Periods

8:36 AM - 11:06 AM
6:37 PM - 9:07 PM

Minor Periods

10:26 AM - 11:56 AM
1:49 AM - 3:19 AM

Action Rating: 3 out of 5

Thursday, March 26, 2026

Weather Forecast

Partly Cloudy
50.6°F
41.2°F
45.1°F
82%
0 in
0%
0%
20.6 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 8.84 μg/m3
PM10: 9.96 μg/m3
Carbon Monoxide: 228.63 μg/m3
Nitrogen Dioxide: 16.07 μg/m3
Sulphur Dioxide: 2.62 μg/m3
Ozone: 66.77 μg/m3

Astronomical

Sunrise: 6:42 AM
Sun Transit: 12:00 AM
Sunset: 7:07 PM
Daylight: 12 hrs 25 mins
Moonrise: 12:06 AM
Moon Transit: 8:07 PM
Moonset: 3:14 AM
Moon Phase: First Quarter
Moon Illumination: 56.4%

Best Times for Fishing or Hunting

Major Periods

9:37 AM - 12:07 AM
7:37 PM - 10:07 PM

Minor Periods

11:36 AM - 1:06 PM
2:44 AM - 4:14 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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