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, CTSponsored Content
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

Conditions: Sunny
Humidity: 50%
Feels Like: 81.1°F
Wind: NW 4 mph
Wind Gusts: 8.5 mph
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
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0
Five Day Weather Forecast

Fri
H: 80°F
L: 71°F

Sat
H: 83°F
L: 64°F

Sun
H: 76°F
L: 72°F

Mon
H: 78°F
L: 65°F

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
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
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%
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 AM9:20 PM - 11:50 PM
Minor Periods
1:43 PM - 3:13 PM12:00 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%
Average Temperature: 76.6°F
Average Humidity: 63%
Chance of Rain: 0%
Wind: 15.2 mph
UV Index: 2.4
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
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
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%
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 AM9:20 PM - 11:50 PM
Minor Periods
1:43 PM - 3:13 PM12:00 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%
Average Temperature: 72.8°F
Average Humidity: 73%
Chance of Rain: 0%
Wind: 12.1 mph
UV Index: 2.5
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
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
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%
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 AM12:00 AM - 12:00 AM
Minor Periods
3:00 PM - 4:30 PM12:00 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%
Average Temperature: 73.8°F
Average Humidity: 94%
Chance of Rain: 88%
Wind: 15.2 mph
UV Index: 2.2
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
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
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%
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 AM12:00 AM - 12:00 AM
Minor Periods
4:19 PM - 5:49 PM12:27 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%
Average Temperature: 71.9°F
Average Humidity: 61%
Chance of Rain: 87%
Wind: 12.3 mph
UV Index: 2.3
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
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
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%
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 AM9:18 AM - 11:48 AM
Minor Periods
5:32 PM - 7:02 PM1:12 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%
Average Temperature: 65.9°F
Average Humidity: 66%
Chance of Rain: 86%
Wind: 11.9 mph
UV Index: 2.3
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
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
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%
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 AM10:22 AM - 12:52 AM
Minor Periods
6:35 PM - 8:05 PM2:09 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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