Water Temperature of the Thames River in Groton, CT

Current Water Temperature

68.9°F

Measurement Time: Friday, July 11, 2025, 5:45 AM EDT

Temperature Locations

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Local Points of Interest

New London, CT

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Thames River

Station Name: THAMES R AT GROTON, CT.
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 10 feet / 3 meters

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 (6.0 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

79°F
Sunny
Conditions: Sunny
Humidity: 50%
Feels Like: 81.1°F
Wind: NW 4 mph
Wind Gusts: 8.5 mph
Pressure: 30.04 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Fri
H: 80°F
L: 71°F
Sunny
Sat
H: 83°F
L: 64°F
Heavy rain
Sun
H: 76°F
L: 72°F
Patchy rain nearby
Mon
H: 78°F
L: 65°F
Patchy rain nearby
Tue
H: 74°F
L: 56°F

Air Quality

AQI: 1 - Good
PM2.5: 16.28 μg/m3
PM10: 17.58 μg/m3
Carbon Monoxide: 331.15 μg/m3
Nitrogen Dioxide: 33.3 μg/m3
Sulphur Dioxide: 2.59 μg/m3
Ozone: 100 μg/m3

Astronomical

Sunrise: 5:31 AM
Sun Transit: 12:54 AM
Sunset: 8:18 PM
Daylight: 14 hrs 48 mins
Moonrise: 12:53 AM
Moon Transit: 6:55 AM
Moonset: 2:13 PM
Moon Phase: Last Quarter
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

6:25 AM - 8:55 AM
9:20 PM - 11:50 PM

Minor Periods

1:43 PM - 3:13 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Friday, July 18, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 76.6°F
Average Humidity: 63%
Chance of Rain: 0%
Wind: 15.2 mph
UV Index: 2.4

Air Quality

AQI: 1 - Good
PM2.5: 10.68 μg/m3
PM10: 11.11 μg/m3
Carbon Monoxide: 331.22 μg/m3
Nitrogen Dioxide: 13.92 μg/m3
Sulphur Dioxide: 1.84 μg/m3
Ozone: 123.72 μg/m3

Astronomical

Sunrise: 5:31 AM
Sun Transit: 12:54 AM
Sunset: 8:18 PM
Daylight: 14 hrs 48 mins
Moonrise: 12:53 AM
Moon Transit: 6:55 AM
Moonset: 2:13 PM
Moon Phase: Last Quarter
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

6:25 AM - 8:55 AM
9:20 PM - 11:50 PM

Minor Periods

1:43 PM - 3:13 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Saturday, July 19, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 72.8°F
Average Humidity: 73%
Chance of Rain: 0%
Wind: 12.1 mph
UV Index: 2.5

Air Quality

AQI: 2 - Moderate
PM2.5: 21.05 μg/m3
PM10: 24.77 μg/m3
Carbon Monoxide: 338.62 μg/m3
Nitrogen Dioxide: 21.57 μg/m3
Sulphur Dioxide: 2.01 μg/m3
Ozone: 118 μg/m3

Astronomical

Sunrise: 5:31 AM
Sun Transit: 12:54 AM
Sunset: 8:17 PM
Daylight: 14 hrs 46 mins
Moonrise: 12:22 AM
Moon Transit: 7:49 AM
Moonset: 3:30 PM
Moon Phase: Last Quarter
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

7:19 AM - 9:49 AM
12:00 AM - 12:00 AM

Minor Periods

3:00 PM - 4:30 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Sunday, July 20, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 73.8°F
Average Humidity: 94%
Chance of Rain: 88%
Wind: 15.2 mph
UV Index: 2.2

Air Quality

AQI: 2 - Moderate
PM2.5: 18.55 μg/m3
PM10: 23.38 μg/m3
Carbon Monoxide: 329.45 μg/m3
Nitrogen Dioxide: 11.66 μg/m3
Sulphur Dioxide: 1.07 μg/m3
Ozone: 125.92 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 12:54 AM
Sunset: 8:17 PM
Daylight: 14 hrs 44 mins
Moonrise: 12:57 AM
Moon Transit: 8:47 AM
Moonset: 4:49 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

8:17 AM - 10:47 AM
12:00 AM - 12:00 AM

Minor Periods

4:19 PM - 5:49 PM
12:27 AM - 1:57 AM

Action Rating: 2 out of 5

Monday, July 21, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 71.9°F
Average Humidity: 61%
Chance of Rain: 87%
Wind: 12.3 mph
UV Index: 2.3

Air Quality

AQI: 1 - Good
PM2.5: 7.75 μg/m3
PM10: 7.83 μg/m3
Carbon Monoxide: 340.7 μg/m3
Nitrogen Dioxide: 11.53 μg/m3
Sulphur Dioxide: 1.29 μg/m3
Ozone: 93.32 μg/m3

Astronomical

Sunrise: 5:33 AM
Sun Transit: 12:54 AM
Sunset: 8:16 PM
Daylight: 14 hrs 43 mins
Moonrise: 1:42 AM
Moon Transit: 9:48 AM
Moonset: 6:02 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:18 AM - 11:48 AM

Minor Periods

5:32 PM - 7:02 PM
1:12 AM - 2:42 AM

Action Rating: 2 out of 5

Tuesday, July 22, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 65.9°F
Average Humidity: 66%
Chance of Rain: 86%
Wind: 11.9 mph
UV Index: 2.3

Air Quality

AQI: 1 - Good
PM2.5: 6.42 μg/m3
PM10: 7.06 μg/m3
Carbon Monoxide: 343.96 μg/m3
Nitrogen Dioxide: 19.15 μg/m3
Sulphur Dioxide: 1.74 μg/m3
Ozone: 65.15 μg/m3

Astronomical

Sunrise: 5:34 AM
Sun Transit: 12:54 AM
Sunset: 8:15 PM
Daylight: 14 hrs 41 mins
Moonrise: 2:39 AM
Moon Transit: 10:52 AM
Moonset: 7:05 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

12:20 AM - 2:50 AM
10:22 AM - 12:52 AM

Minor Periods

6:35 PM - 8:05 PM
2:09 AM - 3:39 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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