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

87.1°F
Sunny
Sunny
84.5°F
90.2°F
27%
WSW 8.7 mph
17.6 mph
91.3°F
54.1°F
0 in
0%
9 mi
1014 mbar
6.6

Five Day Weather Forecast

Sunny
Fri
H: 93°F
L: 57°F
Patchy rain nearby
Sat
H: 75°F
L: 62°F
Moderate rain
Sun
H: 77°F
L: 63°F
Sunny
Mon
H: 70°F
L: 54°F
Sunny
Tue
H: 74°F
L: 58°F

Air Quality

AQI: 1 - Good
PM2.5: 15.1 μg/m3
PM10: 16.3 μg/m3
Carbon Monoxide: 144 μg/m3
Nitrogen Dioxide: 9.2 μg/m3
Sulphur Dioxide: 0.9 μg/m3
Ozone: 142 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

Air Quality Alert issued June 4 at 11:36AM EDT by NWS Upton NY

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Thu June 4, 2026, 11:36 AM
Expires: Fri June 5, 2026, 11:45 AM

The Connecticut Department of Energy and Environmental Protection has issued an Air Quality Action Day for the following counties: Southern Fairfield, Southern New Haven, Southern Middlesex, Southern New London. from 11 AM to 11 PM EDT Friday. An Air Quality Action Day means that Ground Level Ozone within the region may approach or exceed unhealthy standards. For additional information, please visit the Connecticut Department of Energy and Environmental Protection Web site at http://www.ct.gov/deep/aqi


Air Quality Alert issued June 4 at 3:15PM EDT by NWS Upton NY

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Thu June 4, 2026, 3:15 PM
Expires: Fri June 5, 2026, 11:00 PM

The Connecticut Department of Energy and Environmental Protection has issued an Air Quality Action Day for the following counties: Southern Fairfield, Southern New Haven, Southern Middlesex, Southern New London. from 11 AM to 11 PM EDT Friday. An Air Quality Action Day means that Ground Level Ozone within the region may approach or exceed unhealthy standards. For additional information, please visit the Connecticut Department of Energy and Environmental Protection Web site at http://www.ct.gov/deep/aqi


Air Quality Alert issued June 5 at 3:42AM EDT by NWS Upton NY

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Fri June 5, 2026, 3:42 AM
Expires: Fri June 5, 2026, 11:00 PM

The Connecticut Department of Energy and Environmental Protection has issued an Air Quality Action Day for the following counties: Southern Fairfield, Southern New Haven, Southern Middlesex, Southern New London. from 11 AM to 11 PM EDT Friday. An Air Quality Action Day means that Ground Level Ozone within the region may approach or exceed unhealthy standards. For additional information, please visit the Connecticut Department of Energy and Environmental Protection Web site at http://www.ct.gov/deep/aqi


Friday, June 5, 2026

Weather Forecast

Sunny
93.2°F
57.4°F
73.5°F
51%
0 in
0%
0%
8.9 mph
7.8


Air Quality

AQI: 1 - Good
PM2.5: 12.55 μg/m3
PM10: 15.69 μg/m3
Carbon Monoxide: 151.5 μg/m3
Nitrogen Dioxide: 9.78 μg/m3
Sulphur Dioxide: 0.81 μg/m3
Ozone: 113.13 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

Patchy rain nearby
75.3°F
61.6°F
67.7°F
72%
0.02 in
73%
0%
13.2 mph
9.2


Air Quality

AQI: 1 - Good
PM2.5: 12.95 μg/m3
PM10: 17.51 μg/m3
Carbon Monoxide: 148.75 μg/m3
Nitrogen Dioxide: 4.11 μg/m3
Sulphur Dioxide: 0.6 μg/m3
Ozone: 138 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

Sunday, June 7, 2026

Weather Forecast

Moderate rain
77°F
62.9°F
68.9°F
76%
0.26 in
73%
0%
14.5 mph
1.1


Air Quality

AQI: 1 - Good
PM2.5: 7.98 μg/m3
PM10: 9.25 μg/m3
Carbon Monoxide: 137.88 μg/m3
Nitrogen Dioxide: 7.1 μg/m3
Sulphur Dioxide: 0.65 μg/m3
Ozone: 104.88 μg/m3

Astronomical

Sunrise: 5:15 AM
Sun Transit: 12:47 AM
Sunset: 8:20 PM
Daylight: 15 hrs 5 mins
Moonrise: 12:42 AM
Moon Transit: 6:11 AM
Moonset: 11:52 AM
Moon Phase: Last Quarter
Moon Illumination: 42.6%

Best Times for Fishing or Hunting

Major Periods

5:41 AM - 8:11 AM
8:31 PM - 11:01 PM

Minor Periods

11:22 AM - 12:52 AM
12:12 AM - 1:42 AM

Action Rating: 4 out of 5

Monday, June 8, 2026

Weather Forecast

Sunny
70.4°F
53.9°F
63.2°F
63%
0 in
1%
0%
13.6 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 3.56 μg/m3
PM10: 4.71 μg/m3
Carbon Monoxide: 120.35 μg/m3
Nitrogen Dioxide: 3.92 μg/m3
Sulphur Dioxide: 0.48 μg/m3
Ozone: 81.04 μg/m3

Astronomical

Sunrise: 5:15 AM
Sun Transit: 12:47 AM
Sunset: 8:20 PM
Daylight: 15 hrs 5 mins
Moonrise: 1:03 AM
Moon Transit: 6:55 AM
Moonset: 12:58 AM
Moon Phase: Last Quarter
Moon Illumination: 31.6%

Best Times for Fishing or Hunting

Major Periods

6:25 AM - 8:55 AM
9:14 PM - 11:44 PM

Minor Periods

12:28 AM - 1:58 PM
12:33 AM - 2:03 AM

Action Rating: 2 out of 5

Tuesday, June 9, 2026

Weather Forecast

Sunny
74.4°F
58.1°F
65.4°F
62%
0 in
1%
0%
13.9 mph
5


Air Quality

AQI: 1 - Good
PM2.5: 3.84 μg/m3
PM10: 5.68 μg/m3
Carbon Monoxide: 117.11 μg/m3
Nitrogen Dioxide: 3.84 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 79.44 μg/m3

Astronomical

Sunrise: 5:15 AM
Sun Transit: 12:47 AM
Sunset: 8:21 PM
Daylight: 15 hrs 6 mins
Moonrise: 1:24 AM
Moon Transit: 6:27 AM
Moonset: 2:07 PM
Moon Phase: Last Quarter
Moon Illumination: 21.6%

Best Times for Fishing or Hunting

Major Periods

5:57 AM - 8:27 AM
5:57 AM - 8:27 AM

Minor Periods

1:37 PM - 3:07 PM
12:54 AM - 2:24 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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