Water Temperature of the Thames River in Groton, CT

Current Water Temperature

70.9°F

Measurement Time: Tuesday, July 21, 2026, 4:30 AM EDT

Temperature Locations

View Nearby Locations     View All Connecticut Locations     View Locations Near Me

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

57.9°F
Clear
Clear
59.2°F
61.7°F
97%
WSW 2.2 mph
4.7 mph
61.7°F
57°F
0 in
0%
9 mi
1023 mbar
0

Five Day Weather Forecast

Sunny
Fri
H: 85°F
L: 59°F
Sunny
Sat
H: 75°F
L: 59°F
Sunny
Sun
H: 77°F
L: 56°F
Sunny
Mon
H: 73°F
L: 58°F
Partly Cloudy
Tue
H: 74°F
L: 66°F

Air Quality

AQI: 1 - Good
PM2.5: 10.7 μg/m3
PM10: 14.1 μg/m3
Carbon Monoxide: 131 μg/m3
Nitrogen Dioxide: 3.3 μg/m3
Sulphur Dioxide: 0.6 μg/m3
Ozone: 97 μg/m3

Astronomical

Sunrise: 5:36 AM
Sun Transit: 12:54 AM
Sunset: 8:13 PM
Daylight: 14 hrs 38 mins
Moonrise: 4:55 PM
Moon Transit: 9:15 PM
Moonset: 12:54 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

10:49 AM - 1:19 PM
8:45 PM - 11:15 PM

Minor Periods

4:25 PM - 5:55 PM
12:24 AM - 1:54 AM

Action Rating: 2 out of 5

Friday, July 24, 2026

Weather Forecast

Sunny
84.7°F
59.4°F
69.1°F
69%
0 in
5%
0%
10.5 mph
8.5


Air Quality

AQI: 1 - Good
PM2.5: 12.53 μg/m3
PM10: 15.06 μg/m3
Carbon Monoxide: 137.63 μg/m3
Nitrogen Dioxide: 6.76 μg/m3
Sulphur Dioxide: 0.61 μg/m3
Ozone: 100.04 μg/m3

Astronomical

Sunrise: 5:36 AM
Sun Transit: 12:54 AM
Sunset: 8:13 PM
Daylight: 14 hrs 38 mins
Moonrise: 4:55 PM
Moon Transit: 9:15 PM
Moonset: 12:54 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

10:49 AM - 1:19 PM
8:45 PM - 11:15 PM

Minor Periods

4:25 PM - 5:55 PM
12:24 AM - 1:54 AM

Action Rating: 2 out of 5

Saturday, July 25, 2026

Weather Forecast

Sunny
75°F
58.7°F
66.8°F
64%
0 in
4%
0%
11.4 mph
8.5


Air Quality

AQI: 1 - Good
PM2.5: 10.45 μg/m3
PM10: 13.92 μg/m3
Carbon Monoxide: 132.33 μg/m3
Nitrogen Dioxide: 5.61 μg/m3
Sulphur Dioxide: 0.54 μg/m3
Ozone: 86.79 μg/m3

Astronomical

Sunrise: 5:37 AM
Sun Transit: 12:54 AM
Sunset: 8:13 PM
Daylight: 14 hrs 36 mins
Moonrise: 5:51 PM
Moon Transit: 10:07 PM
Moonset: 1:35 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.2%

Best Times for Fishing or Hunting

Major Periods

11:39 AM - 2:09 PM
12:00 AM - 12:00 AM

Minor Periods

5:21 PM - 6:51 PM
1:05 AM - 2:35 AM

Action Rating: 2 out of 5

Sunday, July 26, 2026

Weather Forecast

Sunny
76.9°F
56.1°F
66°F
64%
0 in
4%
0%
10.7 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 8.69 μg/m3
PM10: 10.49 μg/m3
Carbon Monoxide: 139.67 μg/m3
Nitrogen Dioxide: 5.26 μg/m3
Sulphur Dioxide: 0.56 μg/m3
Ozone: 98.88 μg/m3

Astronomical

Sunrise: 5:38 AM
Sun Transit: 12:54 AM
Sunset: 8:12 PM
Daylight: 14 hrs 34 mins
Moonrise: 6:41 PM
Moon Transit: 10:58 PM
Moonset: 2:23 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.3%

Best Times for Fishing or Hunting

Major Periods

12:31 AM - 3:01 PM
12:00 AM - 12:00 AM

Minor Periods

6:11 PM - 7:41 PM
1:53 AM - 3:23 AM

Action Rating: 2 out of 5

Monday, July 27, 2026

Weather Forecast

Sunny
73.1°F
57.6°F
66°F
68%
0 in
6%
0%
8.7 mph
7.4


Air Quality

AQI: 1 - Good
PM2.5: 6.74 μg/m3
PM10: 7.82 μg/m3
Carbon Monoxide: 115.45 μg/m3
Nitrogen Dioxide: 6.07 μg/m3
Sulphur Dioxide: 0.53 μg/m3
Ozone: 77.42 μg/m3

Astronomical

Sunrise: 5:39 AM
Sun Transit: 12:54 AM
Sunset: 8:11 PM
Daylight: 14 hrs 32 mins
Moonrise: 7:22 PM
Moon Transit: 11:49 PM
Moonset: 3:19 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.2%

Best Times for Fishing or Hunting

Major Periods

1:22 PM - 3:52 PM
12:00 AM - 12:00 AM

Minor Periods

6:52 PM - 8:22 PM
2:49 AM - 4:19 AM

Action Rating: 3 out of 5

Tuesday, July 28, 2026

Weather Forecast

Partly Cloudy
74.4°F
65.6°F
70.2°F
82%
0 in
16%
0%
12.1 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 10.73 μg/m3
PM10: 15.41 μg/m3
Carbon Monoxide: 144.11 μg/m3
Nitrogen Dioxide: 1.88 μg/m3
Sulphur Dioxide: 0.56 μg/m3
Ozone: 89.11 μg/m3

Astronomical

Sunrise: 5:39 AM
Sun Transit: 12:54 AM
Sunset: 8:10 PM
Daylight: 14 hrs 30 mins
Moonrise: 7:57 PM
Moon Transit: 12:00 AM
Moonset: 4:21 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:12 PM - 4:42 PM

Minor Periods

7:27 PM - 8:57 PM
3:51 AM - 5:21 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.

Webcams Near Groton, CT

Sponsored Content