Water Temperature of the Thames River in Groton, CT

Current Water Temperature

71.1°F

Measurement Time: Sunday, September 13, 2026, 8:45 AM EDT

Temperature Locations

View Nearby Locations     View All Connecticut Locations     View Locations Near Me

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

64.3°F
Sunny
Conditions: Sunny
Humidity: 74%
Feels Like: 55.6°F
Wind: WSW 18.8 mph
Wind Gusts: 23.8 mph
Pressure: 29.82 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 2.7

Weather Forecast

Sunny
Thu
H: 69°F
L: 60°F
Sunny
Fri
H: 66°F
L: 56°F
Overcast
Sat
H: 63°F
L: 54°F
Overcast
Sun
H: 64°F
L: 60°F
Patchy rain nearby
Mon
H: 65°F
L: 60°F

Air Quality

AQI: 1 - Good
PM2.5: 7.5 μg/m3
PM10: 9.8 μg/m3
Carbon Monoxide: 154 μg/m3
Nitrogen Dioxide: 4.3 μg/m3
Sulphur Dioxide: 1 μg/m3
Ozone: 94 μg/m3

Astronomical

Sunrise: 6:53 AM
Sun Transit: 12:35 AM
Sunset: 6:19 PM
Daylight: 11 hrs 26 mins
Moonrise: 4:37 AM
Moon Transit: 11:01 AM
Moonset: 5:13 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

12:36 AM - 3:06 AM
10:31 AM - 1:01 PM

Minor Periods

4:43 PM - 6:13 PM
4:07 AM - 5:37 AM

Action Rating: 3 out of 5

Thursday, October 8, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 63.9°F
Average Humidity: 68%
Chance of Rain: 5%
Wind: 20.1 mph
UV Index: 4.1

Air Quality

AQI: 1 - Good
PM2.5: 7.58 μg/m3
PM10: 10.06 μg/m3
Carbon Monoxide: 143.63 μg/m3
Nitrogen Dioxide: 4.68 μg/m3
Sulphur Dioxide: 0.97 μg/m3
Ozone: 96.04 μg/m3

Astronomical

Sunrise: 6:53 AM
Sun Transit: 12:35 AM
Sunset: 6:19 PM
Daylight: 11 hrs 26 mins
Moonrise: 4:37 AM
Moon Transit: 11:01 AM
Moonset: 5:13 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

12:36 AM - 3:06 AM
10:31 AM - 1:01 PM

Minor Periods

4:43 PM - 6:13 PM
4:07 AM - 5:37 AM

Action Rating: 3 out of 5

Friday, October 9, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 60.7°F
Average Humidity: 57%
Chance of Rain: 4%
Wind: 18.8 mph
UV Index: 4.1

Air Quality

AQI: 1 - Good
PM2.5: 2.51 μg/m3
PM10: 2.69 μg/m3
Carbon Monoxide: 154.71 μg/m3
Nitrogen Dioxide: 5.12 μg/m3
Sulphur Dioxide: 0.96 μg/m3
Ozone: 71.42 μg/m3

Astronomical

Sunrise: 6:54 AM
Sun Transit: 12:35 AM
Sunset: 6:17 PM
Daylight: 11 hrs 23 mins
Moonrise: 5:46 AM
Moon Transit: 11:45 AM
Moonset: 5:35 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

1:21 AM - 3:51 AM
11:15 AM - 1:45 PM

Minor Periods

5:05 PM - 6:35 PM
5:16 AM - 6:46 AM

Action Rating: 4 out of 5

Saturday, October 10, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 58.9°F
Average Humidity: 57%
Chance of Rain: 13%
Wind: 8.3 mph
UV Index: 3.8

Air Quality

AQI: 1 - Good
PM2.5: 2.83 μg/m3
PM10: 3.38 μg/m3
Carbon Monoxide: 136.17 μg/m3
Nitrogen Dioxide: 3.3 μg/m3
Sulphur Dioxide: 1.03 μg/m3
Ozone: 73.58 μg/m3

Astronomical

Sunrise: 6:55 AM
Sun Transit: 12:35 AM
Sunset: 6:15 PM
Daylight: 11 hrs 21 mins
Moonrise: 6:54 AM
Moon Transit: 12:30 AM
Moonset: 5:57 PM
Moon Phase: New
Moon Illumination: 0.5%

Best Times for Fishing or Hunting

Major Periods

2:05 AM - 4:35 AM
12:00 AM - 2:30 PM

Minor Periods

5:27 PM - 6:57 PM
6:24 AM - 7:54 AM

Action Rating: 3 out of 5

Sunday, October 11, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 62°F
Average Humidity: 74%
Chance of Rain: 85%
Wind: 19.7 mph
UV Index: 1.3

Air Quality

AQI: 1 - Good
PM2.5: 6.94 μg/m3
PM10: 10.83 μg/m3
Carbon Monoxide: 122.24 μg/m3
Nitrogen Dioxide: 1.6 μg/m3
Sulphur Dioxide: 0.94 μg/m3
Ozone: 82.33 μg/m3

Astronomical

Sunrise: 6:56 AM
Sun Transit: 12:35 AM
Sunset: 6:14 PM
Daylight: 11 hrs 18 mins
Moonrise: 8:01 AM
Moon Transit: 1:16 PM
Moonset: 6:22 PM
Moon Phase: New
Moon Illumination: 3.3%

Best Times for Fishing or Hunting

Major Periods

2:51 AM - 5:21 AM
12:46 AM - 3:16 PM

Minor Periods

5:52 PM - 7:22 PM
7:31 AM - 9:01 AM

Action Rating: 4 out of 5

Monday, October 12, 2026

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 62.3°F
Average Humidity: 91%
Chance of Rain: 89%
Wind: 22.1 mph
UV Index: 5

Air Quality

AQI: 1 - Good
PM2.5: 8.5 μg/m3
PM10: 14.3 μg/m3
Carbon Monoxide: 141.56 μg/m3
Nitrogen Dioxide: 1.29 μg/m3
Sulphur Dioxide: 0.43 μg/m3
Ozone: 83.56 μg/m3

Astronomical

Sunrise: 6:57 AM
Sun Transit: 12:34 AM
Sunset: 6:12 PM
Daylight: 11 hrs 15 mins
Moonrise: 9:09 AM
Moon Transit: 2:03 PM
Moonset: 6:50 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

3:37 AM - 6:07 AM
1:33 PM - 4:03 PM

Minor Periods

6:20 PM - 7:50 PM
8:39 AM - 10:09 AM

Action Rating: 4 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.

Webcams Near Groton, CT