Water Temperature of the Thames River in Groton, CT

Current Water Temperature

70.0°F

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, CT

Sponsored 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

57.9°F
Overcast
Conditions: Overcast
Humidity: 97%
Feels Like: 55.7°F
Wind: ENE 10.5 mph
Wind Gusts: 17.6 mph
Pressure: 30.11 in
Precipitation: 0 in
Cloud Cover: 25%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Patchy rain nearby
Wed
H: 67°F
L: 59°F
Patchy rain nearby
Thu
H: 71°F
L: 64°F
Fog
Fri
H: 78°F
L: 64°F
Sunny
Sat
H: 68°F
L: 52°F
Sunny
Sun
H: 66°F
L: 55°F

Air Quality

PM2.5: 11.47 μg/m3
PM10: 16.1 μg/m3
Carbon Monoxide: 338.55 μg/m3
Nitrogen Dioxide: 6.85 μg/m3
Sulphur Dioxide: 1.48 μg/m3
Ozone: 78 μg/m3

Astronomical

Sunrise: 6:31 AM
Sun Transit: 12:42 AM
Sunset: 6:54 PM
Daylight: 12 hrs 22 mins
Moonrise: 1:45 AM
Moon Transit: 9:32 AM
Moonset: 5:08 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:02 AM - 11:32 AM

Minor Periods

4:38 PM - 6:08 PM
1:15 AM - 2:45 AM

Action Rating: 2 out of 5

Rip Current Statement issued September 16 at 2:33PM EDT until September 17 at 8:00PM EDT by NWS Upton NY

Effective: Tue September 16, 2025, 2:33 PM
Expires: Wed September 17, 2025, 8:00 PM

* WHAT...Dangerous rip currents. * WHERE...Kings (Brooklyn), Southwest Suffolk, Southeast Suffolk, Southern Queens and Southern Nassau Counties. * WHEN...Through Wednesday evening. * IMPACTS...Life-threatening rip currents are likely for all people entering the surf zone. Anyone visiting the beaches should stay out of the surf. Rip currents can sweep even the best swimmers away from shore into deeper water.

If you enter the surf zone, always have a flotation device with you and swim near a lifeguard. If caught in a rip current, relax and float, and do not swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and yell or wave for help.


Rip Current Statement issued September 17 at 2:03AM EDT until September 17 at 8:00PM EDT by NWS Upton NY

Effective: Wed September 17, 2025, 2:03 AM
Expires: Wed September 17, 2025, 8:00 PM

* WHAT...Dangerous rip currents. * WHERE...Kings (Brooklyn), Southwest Suffolk, Southeast Suffolk, Southern Queens and Southern Nassau Counties. * WHEN...Through this evening. * IMPACTS...Life-threatening rip currents are likely for all people entering the surf zone. Anyone visiting the beaches should stay out of the surf. Rip currents can sweep even the best swimmers away from shore into deeper water.

If you enter the surf zone, always have a flotation device with you and swim near a lifeguard. If caught in a rip current, relax and float, and do not swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and yell or wave for help.
Wednesday, September 17, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 63°F
Average Humidity: 91%
Chance of Rain: 64%
Wind: 12.1 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 12.7 μg/m3
PM10: 18.02 μg/m3
Carbon Monoxide: 352.91 μg/m3
Nitrogen Dioxide: 5.19 μg/m3
Sulphur Dioxide: 1.13 μg/m3
Ozone: 82.04 μg/m3

Astronomical

Sunrise: 6:31 AM
Sun Transit: 12:42 AM
Sunset: 6:54 PM
Daylight: 12 hrs 22 mins
Moonrise: 1:45 AM
Moon Transit: 9:32 AM
Moonset: 5:08 PM
Moon Phase: Waning Crescent
Moon Illumination: 14.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:02 AM - 11:32 AM

Minor Periods

4:38 PM - 6:08 PM
1:15 AM - 2:45 AM

Action Rating: 2 out of 5

Thursday, September 18, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 66.7°F
Average Humidity: 94%
Chance of Rain: 88%
Wind: 8.7 mph
UV Index: 1.2

Air Quality

AQI: 1 - Good
PM2.5: 11.47 μg/m3
PM10: 16.35 μg/m3
Carbon Monoxide: 352.39 μg/m3
Nitrogen Dioxide: 7.73 μg/m3
Sulphur Dioxide: 1.62 μg/m3
Ozone: 80.68 μg/m3

Astronomical

Sunrise: 6:32 AM
Sun Transit: 12:42 AM
Sunset: 6:52 PM
Daylight: 12 hrs 20 mins
Moonrise: 2:57 AM
Moon Transit: 10:23 AM
Moonset: 5:36 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:53 AM - 12:23 AM

Minor Periods

5:06 PM - 6:36 PM
2:27 AM - 3:57 AM

Action Rating: 3 out of 5

Friday, September 19, 2025

Weather Forecast

Conditions: Fog
Average Temperature: 69.7°F
Average Humidity: 79%
Chance of Rain: 0%
Wind: 11 mph
UV Index: 1.2

Air Quality

AQI: 1 - Good
PM2.5: 11.98 μg/m3
PM10: 13.02 μg/m3
Carbon Monoxide: 400.41 μg/m3
Nitrogen Dioxide: 21.38 μg/m3
Sulphur Dioxide: 2.95 μg/m3
Ozone: 91.32 μg/m3

Astronomical

Sunrise: 6:33 AM
Sun Transit: 12:41 AM
Sunset: 6:50 PM
Daylight: 12 hrs 17 mins
Moonrise: 4:07 AM
Moon Transit: 11:09 AM
Moonset: 5:59 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.8%

Best Times for Fishing or Hunting

Major Periods

12:44 AM - 3:14 AM
10:39 AM - 1:09 PM

Minor Periods

5:29 PM - 6:59 PM
3:37 AM - 5:07 AM

Action Rating: 3 out of 5

Saturday, September 20, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 60.1°F
Average Humidity: 50%
Chance of Rain: 0%
Wind: 12.8 mph
UV Index: 1.4

Air Quality

AQI: 1 - Good
PM2.5: 5.92 μg/m3
PM10: 6.26 μg/m3
Carbon Monoxide: 352.35 μg/m3
Nitrogen Dioxide: 15.55 μg/m3
Sulphur Dioxide: 2.65 μg/m3
Ozone: 73.31 μg/m3

Astronomical

Sunrise: 6:34 AM
Sun Transit: 12:41 AM
Sunset: 6:49 PM
Daylight: 12 hrs 14 mins
Moonrise: 5:13 AM
Moon Transit: 11:52 AM
Moonset: 6:20 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.3%

Best Times for Fishing or Hunting

Major Periods

1:30 AM - 4:00 AM
11:22 AM - 1:52 PM

Minor Periods

5:50 PM - 7:20 PM
4:43 AM - 6:13 AM

Action Rating: 3 out of 5

Sunday, September 21, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 59.9°F
Average Humidity: 66%
Chance of Rain: 0%
Wind: 10.3 mph
UV Index: 0

Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 6:35 AM
Sun Transit: 12:41 AM
Sunset: 6:47 PM
Daylight: 12 hrs 12 mins
Moonrise: 6:18 AM
Moon Transit: 12:34 AM
Moonset: 6:39 PM
Moon Phase: New
Moon Illumination: 0.3%

Best Times for Fishing or Hunting

Major Periods

2:11 AM - 4:41 AM
12:04 AM - 2:34 PM

Minor Periods

6:09 PM - 7:39 PM
5:48 AM - 7:18 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.

Webcams Near Groton, CT

Sponsored Content