Water Temperature of the Thames River in Groton, CT
Current Water Temperature
Measurement Time: Tuesday, September 16, 2025, 4:15 AM EDT
Temperature Locations
View Nearby Locations View All Connecticut Locations View Locations Near Me
Local Points of Interest
New London, CTSponsored Content
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

Humidity: 96%
Feels Like: 59.5°F
Wind: SSE 17.4 mph
Wind Gusts: 28.9 mph
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0
Five Day Weather Forecast

Sun
H: 70°F
L: 46°F

Mon
H: 65°F
L: 54°F

Tue
H: 65°F
L: 50°F

Wed
H: 70°F
L: 56°F

Thu
H: 56°F
L: 46°F
Air Quality
Nitrogen Dioxide: 1.55 μg/m3
Sulphur Dioxide: 1.55 μg/m3
Ozone: 97 μg/m3
Astronomical
Sun Transit: 12:33 AM
Sunset: 6:01 PM
Daylight: 10 hrs 56 mins
Moon Transit: 11:13 AM
Moonset: 5:04 PM
Moon Phase: Waning Crescent
Moon Illumination: 1.3%
Best Times for Fishing or Hunting
Major Periods
12:50 AM - 3:20 AM10:43 AM - 1:13 PM
Minor Periods
4:34 PM - 6:04 PM4:42 AM - 6:12 AM
Action Rating: 3 out of 5
Coastal Flood Statement issued October 19 at 2:51AM EDT until October 20 at 12:00PM EDT by NWS Upton NY
Effective: Sun October 19, 2025, 2:51 AM
Expires: Mon October 20, 2025, 9:30 AM
* WHAT...Up to 1/2 ft of inundation above ground level in the most vulnerable areas near the waterfront and shoreline. * WHERE...Southern Fairfield, Southern New Haven, Southern Middlesex and Southern New London Counties. * WHEN...Monday morning. * IMPACTS...Some water on low lying roads and property. * IMPACTS...Brief minor flooding of the most vulnerable locations near the waterfront and shoreline.
Do not drive through flooded roadways.
Coastal Flood Advisory issued October 19 at 3:07PM EDT until October 20 at 11:00AM EDT by NWS Boston/Norton MA
Effective: Sun October 19, 2025, 3:07 PM
Expires: Mon October 20, 2025, 8:00 AM
* WHAT...Up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways (3.5 to 6.8 feet Mean Lower Low Water). * WHERE...In Massachusetts, Southern Bristol MA and Southern Plymouth MA Counties. In Rhode Island, Southeast Providence RI, Eastern Kent RI, Bristol RI, Washington RI and Newport RI Counties. * WHEN...From 5 AM to 11 AM EDT Monday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected.
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Weather Forecast
Average Temperature: 58.9°F
Average Humidity: 78%
Wind: 17.4 mph
UV Index: 0.7
Air Quality
Nitrogen Dioxide: 7.76 μg/m3
Sulphur Dioxide: 3.73 μg/m3
Ozone: 75.84 μg/m3
Astronomical
Sun Transit: 12:33 AM
Sunset: 6:01 PM
Daylight: 10 hrs 56 mins
Moon Transit: 11:13 AM
Moonset: 5:04 PM
Moon Phase: Waning Crescent
Moon Illumination: 1.3%
Best Times for Fishing or Hunting
Major Periods
12:50 AM - 3:20 AM10:43 AM - 1:13 PM
Minor Periods
4:34 PM - 6:04 PM4:42 AM - 6:12 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 61.9°F
Average Humidity: 80%
Wind: 23 mph
UV Index: 0.5
Air Quality
Nitrogen Dioxide: 2.93 μg/m3
Sulphur Dioxide: 1.92 μg/m3
Ozone: 90.08 μg/m3
Astronomical
Sun Transit: 12:33 AM
Sunset: 5:59 PM
Daylight: 10 hrs 53 mins
Moon Transit: 11:53 AM
Moonset: 5:23 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.0%
Best Times for Fishing or Hunting
Major Periods
1:30 AM - 4:00 AM11:23 AM - 1:53 PM
Minor Periods
4:53 PM - 6:23 PM5:44 AM - 7:14 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 57.8°F
Average Humidity: 66%
Wind: 14.3 mph
UV Index: 0.8
Air Quality
Nitrogen Dioxide: 7.96 μg/m3
Sulphur Dioxide: 3.29 μg/m3
Ozone: 66.4 μg/m3
Astronomical
Sun Transit: 12:32 AM
Sunset: 5:58 PM
Daylight: 10 hrs 51 mins
Moon Transit: 12:34 AM
Moonset: 5:45 PM
Moon Phase: New
Moon Illumination: 1.2%
Best Times for Fishing or Hunting
Major Periods
2:11 AM - 4:41 AM12:04 AM - 2:34 PM
Minor Periods
5:15 PM - 6:45 PM6:46 AM - 8:16 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 63°F
Average Humidity: 74%
Wind: 15.2 mph
UV Index: 0.6
Air Quality
Nitrogen Dioxide: 4.38 μg/m3
Sulphur Dioxide: 3.8 μg/m3
Ozone: 103.16 μg/m3
Astronomical
Sun Transit: 12:32 AM
Sunset: 5:56 PM
Daylight: 10 hrs 48 mins
Moon Transit: 1:18 PM
Moonset: 6:09 PM
Moon Phase: New
Moon Illumination: 0.0%
Best Times for Fishing or Hunting
Major Periods
2:53 AM - 5:23 AM12:48 AM - 3:18 PM
Minor Periods
5:39 PM - 7:09 PM7:50 AM - 9:20 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 51.1°F
Average Humidity: 68%
Wind: 17.2 mph
UV Index: 0.6
Air Quality
Nitrogen Dioxide: 10.16 μg/m3
Sulphur Dioxide: 6.55 μg/m3
Ozone: 60.31 μg/m3
Astronomical
Sun Transit: 12:32 AM
Sunset: 5:55 PM
Daylight: 10 hrs 46 mins
Moon Transit: 2:03 PM
Moonset: 6:39 PM
Moon Phase: New
Moon Illumination: 1.7%
Best Times for Fishing or Hunting
Major Periods
3:38 AM - 6:08 AM1:33 PM - 4:03 PM
Minor Periods
6:09 PM - 7:39 PM8:53 AM - 10:23 AM
Action Rating: 4 out of 5