Water Temperature of the Thames River in Groton, CT

Current Water Temperature

35.2°F

Measurement Time: Tuesday, February 3, 2026, 4:15 AM EST

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

35.1°F
Overcast
Overcast
28.4°F
33°F
96%
WSW 8.3 mph
12.8 mph
29.6°F
30.4°F
0 in
100%
9 mi
1004 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Wed
H: 42°F
L: 29°F
Sunny
Thu
H: 39°F
L: 25°F
Sunny
Fri
H: 39°F
L: 19°F
Partly Cloudy
Sat
H: 36°F
L: 26°F
Partly Cloudy
Sun
H: 36°F
L: 27°F

Air Quality

AQI: 1 - Good
PM2.5: 24.05 μg/m3
PM10: 24.65 μg/m3
Carbon Monoxide: 284.85 μg/m3
Nitrogen Dioxide: 15.95 μg/m3
Sulphur Dioxide: 4.25 μg/m3
Ozone: 59 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 12:02 AM
Sunset: 5:17 PM
Daylight: 10 hrs 29 mins
Moonrise: 2:52 AM
Moon Transit: 7:11 AM
Moonset: 11:27 AM
Moon Phase: Last Quarter
Moon Illumination: 20.5%

Best Times for Fishing or Hunting

Major Periods

6:41 AM - 9:11 AM
12:00 AM - 12:00 AM

Minor Periods

10:57 AM - 12:27 AM
2:22 AM - 3:52 AM

Action Rating: 3 out of 5

Winter Weather Advisory issued February 10 at 1:24PM EST until February 11 at 6:00AM EST by NWS Upton NY

Effective: Tue February 10, 2026, 1:24 PM
Expires: Wed February 11, 2026, 3:00 AM

* WHAT...Mixed precipitation expected. Total snow accumulations up to one inch and ice accumulations up to one tenth of an inch. * WHERE...Portions of southern Connecticut and southeast New York. * WHEN...From 6 PM this evening to 6 AM EST Wednesday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday evening and Wednesday morning commutes. * ADDITIONAL DETAILS...The precipitation is expected to begin mainly as light snow, then change to mainly light freezing rain and freezing drizzle.

Slow down and use caution while traveling. Check local Department of Transportation information services for the latest road conditions. Be prepared for slippery roads. Slow down and use caution while driving. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be icy and slippery, increasing your risk of a fall and injury.


Winter Weather Advisory issued February 10 at 1:34PM EST until February 11 at 6:00AM EST by NWS Boston/Norton MA

Effective: Tue February 10, 2026, 1:34 PM
Expires: Wed February 11, 2026, 6:00 AM

* WHAT...Mixed precipitation expected. Total snow accumulations up to one inch and ice accumulations around a light glaze. * WHERE...In Connecticut, Hartford County. In Massachusetts, Western Hampden County. * WHEN...From 6 PM this evening to 6 AM EST Wednesday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday evening and Wednesday morning commutes.

Slow down and use caution while traveling.
Wednesday, February 11, 2026

Weather Forecast

Patchy rain nearby
41.7°F
29.1°F
34.6°F
75%
0.01 in
63%
16%
15.2 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 10.77 μg/m3
PM10: 12.69 μg/m3
Carbon Monoxide: 233.85 μg/m3
Nitrogen Dioxide: 8.15 μg/m3
Sulphur Dioxide: 2.93 μg/m3
Ozone: 71.32 μg/m3

Astronomical

Sunrise: 6:48 AM
Sun Transit: 12:02 AM
Sunset: 5:17 PM
Daylight: 10 hrs 29 mins
Moonrise: 2:52 AM
Moon Transit: 7:11 AM
Moonset: 11:27 AM
Moon Phase: Last Quarter
Moon Illumination: 20.5%

Best Times for Fishing or Hunting

Major Periods

6:41 AM - 9:11 AM
12:00 AM - 12:00 AM

Minor Periods

10:57 AM - 12:27 AM
2:22 AM - 3:52 AM

Action Rating: 3 out of 5

Thursday, February 12, 2026

Weather Forecast

Sunny
38.7°F
24.6°F
30.5°F
66%
0 in
0%
0%
16.1 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 2.23 μg/m3
PM10: 2.25 μg/m3
Carbon Monoxide: 202.25 μg/m3
Nitrogen Dioxide: 4.61 μg/m3
Sulphur Dioxide: 1.92 μg/m3
Ozone: 78.04 μg/m3

Astronomical

Sunrise: 6:47 AM
Sun Transit: 12:02 AM
Sunset: 5:18 PM
Daylight: 10 hrs 31 mins
Moonrise: 3:48 AM
Moon Transit: 8:02 AM
Moonset: 12:17 AM
Moon Phase: Waning Crescent
Moon Illumination: 12.2%

Best Times for Fishing or Hunting

Major Periods

7:32 AM - 10:02 AM
12:00 AM - 12:00 AM

Minor Periods

11:47 AM - 1:17 PM
3:18 AM - 4:48 AM

Action Rating: 2 out of 5

Friday, February 13, 2026

Weather Forecast

Sunny
38.7°F
18.9°F
28.5°F
67%
0 in
0%
0%
11.6 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 4.83 μg/m3
PM10: 4.95 μg/m3
Carbon Monoxide: 200.61 μg/m3
Nitrogen Dioxide: 8.09 μg/m3
Sulphur Dioxide: 2.14 μg/m3
Ozone: 82.4 μg/m3

Astronomical

Sunrise: 6:46 AM
Sun Transit: 12:02 AM
Sunset: 5:20 PM
Daylight: 10 hrs 34 mins
Moonrise: 4:39 AM
Moon Transit: 8:55 AM
Moonset: 1:15 PM
Moon Phase: Waning Crescent
Moon Illumination: 5.8%

Best Times for Fishing or Hunting

Major Periods

8:25 AM - 10:55 AM
12:00 AM - 12:00 AM

Minor Periods

12:45 AM - 2:15 PM
4:09 AM - 5:39 AM

Action Rating: 2 out of 5

Saturday, February 14, 2026

Weather Forecast

Partly Cloudy
36.1°F
25.8°F
30.8°F
82%
0 in
0%
3%
12.1 mph
0.5


Air Quality

AQI: 1 - Good
PM2.5: 11.9 μg/m3
PM10: 11.97 μg/m3
Carbon Monoxide: 238.39 μg/m3
Nitrogen Dioxide: 21.93 μg/m3
Sulphur Dioxide: 4.85 μg/m3
Ozone: 59.44 μg/m3

Astronomical

Sunrise: 6:45 AM
Sun Transit: 12:02 AM
Sunset: 5:21 PM
Daylight: 10 hrs 36 mins
Moonrise: 5:20 AM
Moon Transit: 9:47 AM
Moonset: 2:19 PM
Moon Phase: Waning Crescent
Moon Illumination: 1.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:17 AM - 11:47 AM

Minor Periods

1:49 PM - 3:19 PM
4:50 AM - 6:20 AM

Action Rating: 3 out of 5

Sunday, February 15, 2026

Weather Forecast

Partly Cloudy
35.8°F
27.1°F
30.6°F
81%
0 in
0%
0%
10.3 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 1.97 μg/m3
PM10: 2 μg/m3
Carbon Monoxide: 176.35 μg/m3
Nitrogen Dioxide: 3.7 μg/m3
Sulphur Dioxide: 1.51 μg/m3
Ozone: 83.23 μg/m3

Astronomical

Sunrise: 6:43 AM
Sun Transit: 12:02 AM
Sunset: 5:22 PM
Daylight: 10 hrs 39 mins
Moonrise: 5:55 AM
Moon Transit: 10:37 AM
Moonset: 3:27 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.0%

Best Times for Fishing or Hunting

Major Periods

12:11 AM - 2:41 AM
10:07 AM - 12:37 AM

Minor Periods

2:57 PM - 4:27 PM
5:25 AM - 6:55 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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