Water Temperature of the Thames River in Groton, CT

Current Water Temperature

50.0°F

Measurement Time: Saturday, May 2, 2026, 11:45 PM 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

76.3°F
Sunny
Sunny
66.6°F
76°F
32%
W 4.5 mph
6.2 mph
76.3°F
45.2°F
0 in
0%
6 mi
1019 mbar
7

Five Day Weather Forecast

Sunny
Tue
H: 79°F
L: 45°F
Sunny
Wed
H: 69°F
L: 52°F
Sunny
Thu
H: 73°F
L: 56°F
Sunny
Fri
H: 74°F
L: 58°F
Sunny
Sat
H: 78°F
L: 63°F

Air Quality

AQI: 1 - Good
PM2.5: 12.5 μg/m3
PM10: 14.1 μg/m3
Carbon Monoxide: 124 μg/m3
Nitrogen Dioxide: 7.9 μg/m3
Sulphur Dioxide: 0.7 μg/m3
Ozone: 87 μg/m3

Astronomical

Sunrise: 5:17 AM
Sun Transit: 12:46 AM
Sunset: 8:16 PM
Daylight: 15 hrs mins
Moonrise: 10:45 PM
Moon Transit: 2:16 AM
Moonset: 6:35 AM
Moon Phase: Full
Moon Illumination: 91.7%

Best Times for Fishing or Hunting

Major Periods

1:46 AM - 4:16 AM
4:40 PM - 7:10 PM

Minor Periods

10:15 PM - 11:45 PM
6:05 AM - 7:35 AM

Action Rating: 3 out of 5

Tuesday, June 2, 2026

Weather Forecast

Sunny
79.3°F
44.8°F
61.8°F
59%
0 in
1%
0%
6.7 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 11.24 μg/m3
PM10: 14.06 μg/m3
Carbon Monoxide: 161.75 μg/m3
Nitrogen Dioxide: 9.53 μg/m3
Sulphur Dioxide: 0.83 μg/m3
Ozone: 85.75 μg/m3

Astronomical

Sunrise: 5:17 AM
Sun Transit: 12:46 AM
Sunset: 8:16 PM
Daylight: 15 hrs mins
Moonrise: 10:45 PM
Moon Transit: 2:16 AM
Moonset: 6:35 AM
Moon Phase: Full
Moon Illumination: 91.7%

Best Times for Fishing or Hunting

Major Periods

1:46 AM - 4:16 AM
4:40 PM - 7:10 PM

Minor Periods

10:15 PM - 11:45 PM
6:05 AM - 7:35 AM

Action Rating: 3 out of 5

Wednesday, June 3, 2026

Weather Forecast

Sunny
69.1°F
51.6°F
60.4°F
62%
0 in
1%
0%
11.2 mph
7.8


Air Quality

AQI: 1 - Good
PM2.5: 7.95 μg/m3
PM10: 9.23 μg/m3
Carbon Monoxide: 140.71 μg/m3
Nitrogen Dioxide: 7.91 μg/m3
Sulphur Dioxide: 0.65 μg/m3
Ozone: 86.58 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:46 AM
Sunset: 8:17 PM
Daylight: 15 hrs 1 mins
Moonrise: 11:21 PM
Moon Transit: 3:07 AM
Moonset: 7:34 AM
Moon Phase: Waning Gibbous
Moon Illumination: 84.4%

Best Times for Fishing or Hunting

Major Periods

2:37 AM - 5:07 AM
5:30 PM - 8:00 PM

Minor Periods

12:00 AM - 12:00 AM
7:04 AM - 8:34 AM

Action Rating: 4 out of 5

Thursday, June 4, 2026

Weather Forecast

Sunny
73.1°F
55.8°F
63.9°F
65%
0 in
1%
0%
13.4 mph
8.1


Air Quality

AQI: 1 - Good
PM2.5: 10.85 μg/m3
PM10: 14.53 μg/m3
Carbon Monoxide: 143.63 μg/m3
Nitrogen Dioxide: 6.97 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 99.67 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:46 AM
Sunset: 8:18 PM
Daylight: 15 hrs 2 mins
Moonrise: 12:21 AM
Moon Transit: 3:56 AM
Moonset: 8:37 AM
Moon Phase: Waning Gibbous
Moon Illumination: 75.3%

Best Times for Fishing or Hunting

Major Periods

3:26 AM - 5:56 AM
6:18 PM - 8:48 PM

Minor Periods

8:07 AM - 9:37 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Friday, June 5, 2026

Weather Forecast

Sunny
74°F
58.1°F
65.8°F
68%
0 in
2%
0%
8.7 mph
8.4


Air Quality

AQI: 1 - Good
PM2.5: 13.4 μg/m3
PM10: 18.14 μg/m3
Carbon Monoxide: 152.96 μg/m3
Nitrogen Dioxide: 7.17 μg/m3
Sulphur Dioxide: 0.66 μg/m3
Ozone: 109.58 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:46 AM
Sunset: 8:18 PM
Daylight: 15 hrs 3 mins
Moonrise: 12:52 AM
Moon Transit: 4:43 AM
Moonset: 9:41 AM
Moon Phase: Waning Gibbous
Moon Illumination: 65.0%

Best Times for Fishing or Hunting

Major Periods

4:13 AM - 6:43 AM
7:03 PM - 9:33 PM

Minor Periods

9:11 AM - 10:41 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Saturday, June 6, 2026

Weather Forecast

Sunny
77.9°F
62.6°F
68.8°F
69%
0 in
2%
0%
15.7 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 12.7 μg/m3
PM10: 16.69 μg/m3
Carbon Monoxide: 190.56 μg/m3
Nitrogen Dioxide: 9.84 μg/m3
Sulphur Dioxide: 0.82 μg/m3
Ozone: 90.56 μg/m3

Astronomical

Sunrise: 5:15 AM
Sun Transit: 12:47 AM
Sunset: 8:19 PM
Daylight: 15 hrs 4 mins
Moonrise: 12:19 AM
Moon Transit: 5:28 AM
Moonset: 10:47 AM
Moon Phase: Last Quarter
Moon Illumination: 53.9%

Best Times for Fishing or Hunting

Major Periods

4:58 AM - 7:28 AM
7:47 PM - 10:17 PM

Minor Periods

10:17 AM - 11:47 AM
12:00 AM - 12:00 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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