Water Temperature of the Thames River in Groton, CT
Current Water Temperature
Measurement Time: Monday, May 19, 2025, 8:00 AM EDT
Temperature Locations
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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: 86%
Feels Like: 62.1°F
Wind: SSW 5.4 mph
Wind Gusts: 11.3 mph
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0
Five Day Weather Forecast

Wed
H: 81°F
L: 48°F

Thu
H: 88°F
L: 55°F

Fri
H: 80°F
L: 61°F

Sat
H: 63°F
L: 58°F

Sun
H: 68°F
L: 59°F
Air Quality
Nitrogen Dioxide: 11.84 μg/m3
Sulphur Dioxide: 3.52 μg/m3
Ozone: 103 μg/m3
Astronomical
Sun Transit: 12:46 AM
Sunset: 8:18 PM
Daylight: 15 hrs 2 mins
Moon Transit: 8:11 PM
Moonset: 1:46 AM
Moon Phase: First Quarter
Moon Illumination: 59.8%
Best Times for Fishing or Hunting
Major Periods
9:48 AM - 12:18 AM7:41 PM - 10:11 PM
Minor Periods
1:38 PM - 3:08 PM1:16 AM - 2:46 AM
Action Rating: 2 out of 5
Air Quality Alert issued June 3 at 3:15PM EDT by NWS Upton NY
Non-Weather Emergency Message. Not sent to IPAWS.
Effective: Tue June 3, 2025, 3:15 PM
Expires: Wed June 4, 2025, 11:00 PM
The Connecticut Department of Energy and Environmental Protection has issued an Air Quality Action Day for the following counties: Fairfield, New Haven, Middlesex, Northern New London. from 11 AM to 11 PM EDT Wednesday. 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 3 at 3:15PM EDT by NWS Upton NY
Non-Weather Emergency Message. Not sent to IPAWS.
Effective: Tue June 3, 2025, 3:15 PM
Expires: Wed June 4, 2025, 11:00 PM
The Connecticut Department of Energy and Environmental Protection has issued an Air Quality Action Day for the following counties: Fairfield, New Haven, Middlesex, Northern New London. from 11 AM to 11 PM EDT Wednesday. 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 4:17PM EDT by NWS Upton NY
Non-Weather Emergency Message. Not sent to IPAWS.
Effective: Wed June 4, 2025, 4:17 PM
Expires: Wed June 4, 2025, 11:00 PM
The Connecticut Department of Energy and Environmental Protection's Air Quality Action Day remains in effect for the following counties: Fairfield, New Haven, Middlesex, and Northern New London, until 11 PM EDT this evening. 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 3 at 3:15PM EDT by NWS Upton NY
Non-Weather Emergency Message. Not sent to IPAWS.
Effective: Tue June 3, 2025, 3:15 PM
Expires: Wed June 4, 2025, 11:00 PM
The Connecticut Department of Energy and Environmental Protection has issued an Air Quality Action Day for the following counties: Fairfield, New Haven, Middlesex, Northern New London. from 11 AM to 11 PM EDT Wednesday. 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 3 at 3:15PM EDT by NWS Upton NY
Non-Weather Emergency Message. Not sent to IPAWS.
Effective: Tue June 3, 2025, 3:15 PM
Expires: Wed June 4, 2025, 11:00 PM
The Connecticut Department of Energy and Environmental Protection has issued an Air Quality Action Day for the following counties: Fairfield, New Haven, Middlesex, Northern New London. from 11 AM to 11 PM EDT Wednesday. 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
Weather Forecast
Average Temperature: 64.7°F
Average Humidity: 81%
Wind: 10.7 mph
UV Index: 2
Air Quality
Nitrogen Dioxide: 17.56 μg/m3
Sulphur Dioxide: 4.45 μg/m3
Ozone: 131.36 μg/m3
Astronomical
Sun Transit: 12:46 AM
Sunset: 8:18 PM
Daylight: 15 hrs 2 mins
Moon Transit: 8:11 PM
Moonset: 1:46 AM
Moon Phase: First Quarter
Moon Illumination: 59.8%
Best Times for Fishing or Hunting
Major Periods
9:48 AM - 12:18 AM7:41 PM - 10:11 PM
Minor Periods
1:38 PM - 3:08 PM1:16 AM - 2:46 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 69.6°F
Average Humidity: 85%
Wind: 10.1 mph
UV Index: 2
Air Quality
Nitrogen Dioxide: 20.14 μg/m3
Sulphur Dioxide: 5.74 μg/m3
Ozone: 112.88 μg/m3
Astronomical
Sun Transit: 12:46 AM
Sunset: 8:19 PM
Daylight: 15 hrs 3 mins
Moon Transit: 8:50 PM
Moonset: 2:04 AM
Moon Phase: First Quarter
Moon Illumination: 70.6%
Best Times for Fishing or Hunting
Major Periods
10:28 AM - 12:58 AM8:20 PM - 10:50 PM
Minor Periods
2:38 PM - 4:08 PM1:34 AM - 3:04 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 69.2°F
Average Humidity: 88%
Wind: 13.6 mph
UV Index: 2.1
Air Quality
Nitrogen Dioxide: 26.65 μg/m3
Sulphur Dioxide: 5.85 μg/m3
Ozone: 82.88 μg/m3
Astronomical
Sun Transit: 12:47 AM
Sunset: 8:19 PM
Daylight: 15 hrs 4 mins
Moon Transit: 9:31 PM
Moonset: 2:24 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 80.3%
Best Times for Fishing or Hunting
Major Periods
11:08 AM - 1:38 PM9:01 PM - 11:31 PM
Minor Periods
3:40 PM - 5:10 PM1:54 AM - 3:24 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 60.7°F
Average Humidity: 97%
Wind: 7.8 mph
UV Index: 0.9
Air Quality
Nitrogen Dioxide: 9.83 μg/m3
Sulphur Dioxide: 0.94 μg/m3
Ozone: 71.6 μg/m3
Astronomical
Sun Transit: 12:47 AM
Sunset: 8:20 PM
Daylight: 15 hrs 5 mins
Moon Transit: 10:13 PM
Moonset: 2:44 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 88.5%
Best Times for Fishing or Hunting
Major Periods
11:49 AM - 2:19 PM12:00 AM - 12:00 AM
Minor Periods
4:42 PM - 6:12 PM2:14 AM - 3:44 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 63.4°F
Average Humidity: 90%
Wind: 6.3 mph
UV Index: 1.1
Air Quality
Nitrogen Dioxide: 11.81 μg/m3
Sulphur Dioxide: 1.21 μg/m3
Ozone: 66.23 μg/m3
Astronomical
Sun Transit: 12:47 AM
Sunset: 8:20 PM
Daylight: 15 hrs 6 mins
Moon Transit: 11:00 PM
Moonset: 3:08 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 94.7%
Best Times for Fishing or Hunting
Major Periods
12:33 AM - 3:03 PM12:00 AM - 12:00 AM
Minor Periods
5:46 PM - 7:16 PM2:38 AM - 4:08 AM
Action Rating: 2 out of 5