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

37°F
Overcast
Overcast
27.7°F
37.1°F
89%
NNE 15.9 mph
22.6 mph
29.6°F
35.3°F
0.05 in
100%
9 mi
1024 mbar
1

Five Day Weather Forecast

Moderate rain
Fri
H: 40°F
L: 35°F
Mist
Sat
H: 38°F
L: 33°F
Fog
Sun
H: 45°F
L: 38°F
Cloudy
Mon
H: 48°F
L: 38°F
Patchy rain nearby
Tue
H: 54°F
L: 44°F

Air Quality

AQI: 1 - Good
PM2.5: 2.15 μg/m3
PM10: 2.45 μg/m3
Carbon Monoxide: 198.85 μg/m3
Nitrogen Dioxide: 6.15 μg/m3
Sulphur Dioxide: 1.35 μg/m3
Ozone: 89 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

Special Weather Statement issued March 5 at 1:38PM EST by NWS Upton NY

Effective: Thu March 5, 2026, 1:38 PM
Expires: Fri March 6, 2026, 4:00 AM

As rain continues to fall tonight into Friday morning, temperatures are expected to lower to near the freezing mark. Localized icy conditions could develop, and motorists and pedestrians are advised to use extra caution if traveling tonight or early Friday morning. Check with your local Department of Transportation on current road conditions.


Winter Weather Advisory issued March 5 at 1:23PM EST until March 6 at 12:00PM EST by NWS Boston/Norton MA

Effective: Thu March 5, 2026, 1:23 PM
Expires: Fri March 6, 2026, 5:00 AM

* WHAT...Mixed precipitation expected. Total snow and sleet accumulations up to 3 inches and ice accumulations around three tenths of an inch. Greatest risk for over one quarter inch of ice accretion will be in the southern Berkshires and the southern Worcester Hills. * WHERE...Portions of northern Connecticut and central, eastern, and western Massachusetts. * WHEN...From 5 PM this afternoon to noon EST Friday. * IMPACTS...Power outages and tree damage are likely due to the ice. Travel could be nearly impossible. The hazardous conditions could impact the Thursday evening and Friday morning commutes.

Slow down and use caution while traveling.


Winter Weather Advisory issued March 5 at 10:28PM EST until March 6 at 12:00PM EST by NWS Boston/Norton MA

Effective: Thu March 5, 2026, 10:28 PM
Expires: Fri March 6, 2026, 11:30 AM

* WHAT...Mixed precipitation expected. Total snow and sleet accumulations up to 3 inches and ice accumulations around three tenths of an inch. Greatest risk for over one quarter inch of ice accretion will be in the southern Berkshires and the southern Worcester Hills. * WHERE...Portions of northern Connecticut and central, eastern, and western Massachusetts. * WHEN...Until noon EST Friday. * IMPACTS...Greatest risk for ice damage will be in the southern Berks and the southern Worcester Hills. The Friday morning commute will be impacted.

Slow down and use caution while traveling.


Winter Weather Advisory issued March 5 at 1:23PM EST until March 6 at 12:00PM EST by NWS Boston/Norton MA

Effective: Thu March 5, 2026, 1:23 PM
Expires: Fri March 6, 2026, 5:00 AM

* WHAT...Mixed precipitation expected. Total snow and sleet accumulations of a coating to 2 inches in western MA, up to 4 inches in northeastern MA, and ice accumulations around one tenth of an inch in both regions. * WHERE...Portions of northern Connecticut, eastern, northeastern, and western Massachusetts, and northern Rhode Island. * WHEN...From 5 PM this afternoon to noon EST Friday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Thursday evening and Friday morning commutes.

Slow down and use caution while traveling.


Winter Weather Advisory issued March 5 at 10:28PM EST until March 6 at 12:00PM EST by NWS Boston/Norton MA

Effective: Thu March 5, 2026, 10:28 PM
Expires: Fri March 6, 2026, 11:30 AM

* WHAT...Mixed precipitation expected. Total snow and sleet accumulations of a coating to 2 inches in western MA, up to 4 inches in northeastern MA with isolated 5-6 inch amounts not of out of the question near the New Hampshire border. Ice accumulations around one tenth of an inch in both regions. * WHERE...Portions of northern Connecticut, eastern, northeastern, and western Massachusetts, and northern Rhode Island. * WHEN...Until noon EST Friday. * IMPACTS...Plan on slippery road conditions. The Friday morning commute will be impacted.

Slow down and use caution while traveling.


Friday, March 6, 2026

Weather Forecast

Moderate rain
39.7°F
34.5°F
37.4°F
92%
0.72 in
86%
0%
17.9 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 3.95 μg/m3
PM10: 4.82 μg/m3
Carbon Monoxide: 197.49 μg/m3
Nitrogen Dioxide: 6.93 μg/m3
Sulphur Dioxide: 1.47 μg/m3
Ozone: 83.8 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

Mist
37.5°F
33.4°F
35.8°F
96%
0 in
0%
0%
10.5 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 7.98 μg/m3
PM10: 10.9 μg/m3
Carbon Monoxide: 203.21 μg/m3
Nitrogen Dioxide: 7.21 μg/m3
Sulphur Dioxide: 1.39 μg/m3
Ozone: 75.72 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

Sunday, March 8, 2026

Weather Forecast

Fog
45°F
38°F
42.1°F
98%
0 in
0%
0%
12.3 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 10.35 μg/m3
PM10: 11.26 μg/m3
Carbon Monoxide: 189.25 μg/m3
Nitrogen Dioxide: 12.67 μg/m3
Sulphur Dioxide: 2.13 μg/m3
Ozone: 52.6 μg/m3

Astronomical

Sunrise: 6:12 AM
Sun Transit: 12:00 AM
Sunset: 5:47 PM
Daylight: 11 hrs 35 mins
Moonrise: 11:36 PM
Moon Transit: 3:25 AM
Moonset: 8:13 AM
Moon Phase: Waning Gibbous
Moon Illumination: 69.3%

Best Times for Fishing or Hunting

Major Periods

2:55 AM - 5:25 AM
5:47 PM - 8:17 PM

Minor Periods

12:00 AM - 12:00 AM
7:43 AM - 9:13 AM

Action Rating: 3 out of 5

Monday, March 9, 2026

Weather Forecast

Cloudy
47.8°F
38.4°F
43.1°F
92%
0 in
0%
0%
8.7 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 12.59 μg/m3
PM10: 13.52 μg/m3
Carbon Monoxide: 263.72 μg/m3
Nitrogen Dioxide: 23.66 μg/m3
Sulphur Dioxide: 3.74 μg/m3
Ozone: 49.96 μg/m3

Astronomical

Sunrise: 6:10 AM
Sun Transit: 11:58 AM
Sunset: 5:48 PM
Daylight: 11 hrs 38 mins
Moonrise: 12:36 AM
Moon Transit: 4:12 AM
Moonset: 8:44 AM
Moon Phase: Waning Gibbous
Moon Illumination: 58.5%

Best Times for Fishing or Hunting

Major Periods

3:42 AM - 6:12 AM
6:35 PM - 9:05 PM

Minor Periods

8:14 AM - 9:44 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Tuesday, March 10, 2026

Weather Forecast

Patchy rain nearby
54.2°F
43.9°F
46.7°F
95%
0.01 in
89%
0%
9.6 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 8.46 μg/m3
PM10: 9.4 μg/m3
Carbon Monoxide: 178.14 μg/m3
Nitrogen Dioxide: 6.62 μg/m3
Sulphur Dioxide: 1.33 μg/m3
Ozone: 72.17 μg/m3

Astronomical

Sunrise: 6:08 AM
Sun Transit: 11:58 AM
Sunset: 5:49 PM
Daylight: 11 hrs 41 mins
Moonrise: 12:39 AM
Moon Transit: 5:02 AM
Moonset: 9:21 AM
Moon Phase: Last Quarter
Moon Illumination: 47.2%

Best Times for Fishing or Hunting

Major Periods

4:32 AM - 7:02 AM
7:25 PM - 9:55 PM

Minor Periods

8:51 AM - 10:21 AM
12:09 AM - 1:39 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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