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

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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

59.5°F
Clear
Conditions: Clear
Humidity: 96%
Feels Like: 59.5°F
Wind: SSE 17.4 mph
Wind Gusts: 28.9 mph
Pressure: 29.93 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Sun
H: 70°F
L: 46°F
Heavy rain
Mon
H: 65°F
L: 54°F
Sunny
Tue
H: 65°F
L: 50°F
Patchy rain nearby
Wed
H: 70°F
L: 56°F
Partly Cloudy
Thu
H: 56°F
L: 46°F

Air Quality

AQI: 1 - Good
PM2.5: 10.95 μg/m3
PM10: 15.25 μg/m3
Carbon Monoxide: 139.85 μg/m3
Nitrogen Dioxide: 1.55 μg/m3
Sulphur Dioxide: 1.55 μg/m3
Ozone: 97 μg/m3

Astronomical

Sunrise: 7:05 AM
Sun Transit: 12:33 AM
Sunset: 6:01 PM
Daylight: 10 hrs 56 mins
Moonrise: 5:12 AM
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 AM
10:43 AM - 1:13 PM

Minor Periods

4:34 PM - 6:04 PM
4:42 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.
Sunday, October 19, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 58.9°F
Average Humidity: 78%
Chance of Rain: 0%
Wind: 17.4 mph
UV Index: 0.7

Air Quality

AQI: 1 - Good
PM2.5: 9.39 μg/m3
PM10: 12.3 μg/m3
Carbon Monoxide: 189.13 μg/m3
Nitrogen Dioxide: 7.76 μg/m3
Sulphur Dioxide: 3.73 μg/m3
Ozone: 75.84 μg/m3

Astronomical

Sunrise: 7:05 AM
Sun Transit: 12:33 AM
Sunset: 6:01 PM
Daylight: 10 hrs 56 mins
Moonrise: 5:12 AM
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 AM
10:43 AM - 1:13 PM

Minor Periods

4:34 PM - 6:04 PM
4:42 AM - 6:12 AM

Action Rating: 3 out of 5

Monday, October 20, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 61.9°F
Average Humidity: 80%
Chance of Rain: 88%
Wind: 23 mph
UV Index: 0.5

Air Quality

AQI: 1 - Good
PM2.5: 8.9 μg/m3
PM10: 12.4 μg/m3
Carbon Monoxide: 149.73 μg/m3
Nitrogen Dioxide: 2.93 μg/m3
Sulphur Dioxide: 1.92 μg/m3
Ozone: 90.08 μg/m3

Astronomical

Sunrise: 7:06 AM
Sun Transit: 12:33 AM
Sunset: 5:59 PM
Daylight: 10 hrs 53 mins
Moonrise: 6:14 AM
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 AM
11:23 AM - 1:53 PM

Minor Periods

4:53 PM - 6:23 PM
5:44 AM - 7:14 AM

Action Rating: 4 out of 5

Tuesday, October 21, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 57.8°F
Average Humidity: 66%
Chance of Rain: 0%
Wind: 14.3 mph
UV Index: 0.8

Air Quality

AQI: 1 - Good
PM2.5: 3.69 μg/m3
PM10: 4.12 μg/m3
Carbon Monoxide: 169.97 μg/m3
Nitrogen Dioxide: 7.96 μg/m3
Sulphur Dioxide: 3.29 μg/m3
Ozone: 66.4 μg/m3

Astronomical

Sunrise: 7:07 AM
Sun Transit: 12:32 AM
Sunset: 5:58 PM
Daylight: 10 hrs 51 mins
Moonrise: 7:16 AM
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 AM
12:04 AM - 2:34 PM

Minor Periods

5:15 PM - 6:45 PM
6:46 AM - 8:16 AM

Action Rating: 4 out of 5

Wednesday, October 22, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 63°F
Average Humidity: 74%
Chance of Rain: 88%
Wind: 15.2 mph
UV Index: 0.6

Air Quality

AQI: 1 - Good
PM2.5: 11.08 μg/m3
PM10: 14.41 μg/m3
Carbon Monoxide: 159.65 μg/m3
Nitrogen Dioxide: 4.38 μg/m3
Sulphur Dioxide: 3.8 μg/m3
Ozone: 103.16 μg/m3

Astronomical

Sunrise: 7:08 AM
Sun Transit: 12:32 AM
Sunset: 5:56 PM
Daylight: 10 hrs 48 mins
Moonrise: 8:20 AM
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 AM
12:48 AM - 3:18 PM

Minor Periods

5:39 PM - 7:09 PM
7:50 AM - 9:20 AM

Action Rating: 4 out of 5

Thursday, October 23, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 51.1°F
Average Humidity: 68%
Chance of Rain: 0%
Wind: 17.2 mph
UV Index: 0.6

Air Quality

AQI: 1 - Good
PM2.5: 5.38 μg/m3
PM10: 5.43 μg/m3
Carbon Monoxide: 171.23 μg/m3
Nitrogen Dioxide: 10.16 μg/m3
Sulphur Dioxide: 6.55 μg/m3
Ozone: 60.31 μg/m3

Astronomical

Sunrise: 7:09 AM
Sun Transit: 12:32 AM
Sunset: 5:55 PM
Daylight: 10 hrs 46 mins
Moonrise: 9:23 AM
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 AM
1:33 PM - 4:03 PM

Minor Periods

6:09 PM - 7:39 PM
8:53 AM - 10:23 AM

Action Rating: 4 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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