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

15.1°F
Clear
Clear
9.9°F
17.1°F
80%
SSE 3.1 mph
6.6 mph
13.6°F
5°F
0 in
0%
9 mi
1038 mbar
0

Five Day Weather Forecast

Moderate or heavy snow showers
Tue
H: 35°F
L: 16°F
Moderate rain
Wed
H: 40°F
L: 31°F
Patchy rain nearby
Thu
H: 40°F
L: 30°F
Moderate rain
Fri
H: 38°F
L: 33°F
Patchy rain nearby
Sat
H: 39°F
L: 34°F

Air Quality

AQI: 1 - Good
PM2.5: 7.55 μg/m3
PM10: 10.95 μg/m3
Carbon Monoxide: 234.85 μg/m3
Nitrogen Dioxide: 2.25 μg/m3
Sulphur Dioxide: 1.95 μg/m3
Ozone: 96 μg/m3

Astronomical

Sunrise: 6:20 AM
Sun Transit: 12:00 AM
Sunset: 5:41 PM
Daylight: 11 hrs 22 mins
Moonrise: 6:09 PM
Moon Transit: 12:00 AM
Moonset: 6:22 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:07 PM - 4:37 PM

Minor Periods

5:39 PM - 7:09 PM
5:52 AM - 7:22 AM

Action Rating: 5 out of 5

Winter Weather Advisory issued March 3 at 12:36AM EST until March 3 at 10:00PM EST by NWS Upton NY

Effective: Tue March 3, 2026, 12:36 AM
Expires: Tue March 3, 2026, 3:00 PM

* WHAT...Mixed precipitation expected. Total snow accumulations up to one inch and ice accumulations of a light glaze to a few hundredths of an inch. * WHERE...In Connecticut, Northern Fairfield, Northern Middlesex, Northern New Haven, and Northern New London Counties. In New York, Putnam County. * WHEN...From 10 AM this morning to 10 PM EST this evening. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Tuesday evening commute. * ADDITIONAL DETAILS...Amounts could approach a tenth of an inch for higher elevations and north and west of Interstate 84.

Slow down and use caution while traveling. Check local Department of Transportation information services for the latest road conditions.


Winter Weather Advisory issued March 2 at 12:54PM EST until March 4 at 7:00AM EST by NWS Boston/Norton MA

Effective: Mon March 2, 2026, 12:54 PM
Expires: Tue March 3, 2026, 6:00 AM

* WHAT...Mixed precipitation expected. Total snow and sleet accumulations up to one inch and ice accumulations up to one-tenth of an inch. * WHERE...Northern Connecticut, northwest Rhode Island, and western, central and northeastern Massachusetts. * WHEN...From noon Tuesday to 7 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.


Winter Weather Advisory issued March 2 at 10:32PM EST until March 4 at 7:00AM EST by NWS Boston/Norton MA

Effective: Mon March 2, 2026, 10:32 PM
Expires: Tue March 3, 2026, 4:15 PM

* WHAT...Mixed precipitation expected. Total snow accumulations up to two inches and ice accumulations around one tenth of an inch. * WHERE...Portions of northern Connecticut, central, eastern, northeastern, and western Massachusetts, and northern Rhode Island. * WHEN...From noon Tuesday to 7 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.
Tuesday, March 3, 2026

Weather Forecast

Moderate or heavy snow showers
34.5°F
15.6°F
26.6°F
82%
0.44 in
69%
12%
8.5 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 7.31 μg/m3
PM10: 10.45 μg/m3
Carbon Monoxide: 226.81 μg/m3
Nitrogen Dioxide: 3.33 μg/m3
Sulphur Dioxide: 2 μg/m3
Ozone: 93.04 μg/m3

Astronomical

Sunrise: 6:20 AM
Sun Transit: 12:00 AM
Sunset: 5:41 PM
Daylight: 11 hrs 22 mins
Moonrise: 6:09 PM
Moon Transit: 12:00 AM
Moonset: 6:22 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:07 PM - 4:37 PM

Minor Periods

5:39 PM - 7:09 PM
5:52 AM - 7:22 AM

Action Rating: 5 out of 5

Wednesday, March 4, 2026

Weather Forecast

Moderate rain
39.7°F
30.8°F
36.2°F
96%
0.49 in
86%
3%
8.9 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 10.91 μg/m3
PM10: 12.19 μg/m3
Carbon Monoxide: 266.61 μg/m3
Nitrogen Dioxide: 17.18 μg/m3
Sulphur Dioxide: 2.55 μg/m3
Ozone: 62.48 μg/m3

Astronomical

Sunrise: 6:18 AM
Sun Transit: 12:00 AM
Sunset: 5:42 PM
Daylight: 11 hrs 24 mins
Moonrise: 7:16 PM
Moon Transit: 12:31 AM
Moonset: 6:42 AM
Moon Phase: Full
Moon Illumination: 98.2%

Best Times for Fishing or Hunting

Major Periods

12:01 AM - 2:31 AM
2:50 PM - 5:20 PM

Minor Periods

6:46 PM - 8:16 PM
6:12 AM - 7:42 AM

Action Rating: 5 out of 5

Thursday, March 5, 2026

Weather Forecast

Patchy rain nearby
40.2°F
30°F
35.4°F
97%
0.13 in
84%
0%
8.9 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 14.35 μg/m3
PM10: 16.83 μg/m3
Carbon Monoxide: 393.13 μg/m3
Nitrogen Dioxide: 25.29 μg/m3
Sulphur Dioxide: 3.01 μg/m3
Ozone: 37.52 μg/m3

Astronomical

Sunrise: 6:17 AM
Sun Transit: 12:00 AM
Sunset: 5:44 PM
Daylight: 11 hrs 27 mins
Moonrise: 8:22 PM
Moon Transit: 1:14 AM
Moonset: 7:02 AM
Moon Phase: Full
Moon Illumination: 94.0%

Best Times for Fishing or Hunting

Major Periods

12:44 AM - 3:14 AM
3:33 PM - 6:03 PM

Minor Periods

7:52 PM - 9:22 PM
6:32 AM - 8:02 AM

Action Rating: 5 out of 5

Friday, March 6, 2026

Weather Forecast

Moderate rain
37.9°F
33.4°F
36.5°F
95%
0.37 in
87%
0%
14.8 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 5.21 μg/m3
PM10: 6.06 μg/m3
Carbon Monoxide: 252.72 μg/m3
Nitrogen Dioxide: 12.96 μg/m3
Sulphur Dioxide: 1.7 μg/m3
Ozone: 68.24 μg/m3

Astronomical

Sunrise: 6:15 AM
Sun Transit: 12:00 AM
Sunset: 5:45 PM
Daylight: 11 hrs 30 mins
Moonrise: 9:27 PM
Moon Transit: 1:57 AM
Moonset: 7:23 AM
Moon Phase: Waning Gibbous
Moon Illumination: 87.6%

Best Times for Fishing or Hunting

Major Periods

1:27 AM - 3:57 AM
4:16 PM - 6:46 PM

Minor Periods

8:57 PM - 10:27 PM
6:53 AM - 8:23 AM

Action Rating: 2 out of 5

Saturday, March 7, 2026

Weather Forecast

Patchy rain nearby
38.9°F
34°F
36.3°F
96%
0 in
87%
0%
11.2 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 5.67 μg/m3
PM10: 7.73 μg/m3
Carbon Monoxide: 185.68 μg/m3
Nitrogen Dioxide: 5.83 μg/m3
Sulphur Dioxide: 1.42 μg/m3
Ozone: 79.31 μg/m3

Astronomical

Sunrise: 6:13 AM
Sun Transit: 12:00 AM
Sunset: 5:46 PM
Daylight: 11 hrs 33 mins
Moonrise: 10:32 PM
Moon Transit: 2:40 AM
Moonset: 7:46 AM
Moon Phase: Waning Gibbous
Moon Illumination: 79.2%

Best Times for Fishing or Hunting

Major Periods

2:10 AM - 4:40 AM
5:00 PM - 7:30 PM

Minor Periods

10:02 PM - 11:32 PM
7:16 AM - 8:46 AM

Action Rating: 2 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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