Water Temperature of the Thames River in Groton, CT

Current Water Temperature

60.6°F 15.9°C
Cool Brisk & Refreshing
60.6°F
Frigid < 50°F
Cold 50°–60°
Cool 60°–70°
Comfortable 70°–80°
Warm 80°+

Feels brisk on entry. Great for short dips; wetsuit recommended for extended swimming or water sports.

Measurement Time: Thursday, October 29, 2026, 5:45 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

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 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

60.3°F
Patchy rain nearby
Conditions: Patchy rain nearby
Humidity: 84%
Feels Like: 54.9°F
Wind: W 12.8 mph
Wind Gusts: 18.9 mph
Pressure: 29.7 in
Precipitation: 0 in
Cloud Cover: 60%
Visibility: 6 mi
UV Index: 0.1

Weather Forecast

Patchy rain nearby
Sat
H: 62°F
L: 50°F
Sunny
Sun
H: 58°F
L: 49°F
Sunny
Mon
H: 55°F
L: 48°F

Air Quality

EPA Index 1 • Good

Air quality is satisfactory, and air pollution poses little or no risk.

PM2.5
6.5 μg/m³
Good
PM10
6.9 μg/m³
Good
Ozone (O3)
54 μg/m³
Photochemical
NO2
17 μg/m³
Nitrogen Dioxide
SO2
1.3 μg/m³
Sulfur Dioxide
CO
213 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 9m daylight
Sunrise 6:27 AM
Solar Noon 11:32 AM
Sunset 4:37 PM
Moon
Waning Crescent • 1%
Moonrise 4:49 AM
Transit 10:11 AM
Moonset 3:24 PM

Best Times for Fishing or Hunting

Major Periods

9:41 AM - 12:11 PM
10:03 PM - 12:33 AM

Minor Periods

4:19 AM - 5:49 AM
2:54 PM - 4:24 PM
Action Rating:
Good Action 3/5

Small Craft Advisory issued November 7 at 1:51PM EST until November 8 at 6:00PM EST by NWS Upton NY

Effective: Sat November 7, 2026, 1:51 PM
Expires: Sun November 8, 2026, 3:00 AM

* WHAT...West winds 10 to 20 kt with gusts up to 30 kt and seas 2 to 4 feet expected. * WHERE...Long Island Sound, New York Harbor, Peconic and Gardiners Bays, and South Shore Bays from Jones Inlet through Shinnecock Bay. * WHEN...Until 6 PM EST Sunday. * IMPACTS...Conditions will be hazardous to small craft.


Small Craft Advisory issued November 7 at 1:10PM EST until November 8 at 7:00PM EST by NWS Boston/Norton MA

Effective: Sat November 7, 2026, 1:10 PM
Expires: Sun November 8, 2026, 3:00 AM

* WHAT...West winds 10 to 20 kt with gusts up to 30 kt and seas 4 to 6 feet expected. * WHERE...Rhode Island Sound and Block Island Sound. * WHEN...From 7 PM this evening to 7 PM EST Sunday. * IMPACTS...Conditions will be hazardous to small craft.
Saturday, November 7, 2026

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 58.3°F
Average Humidity: 88%
Chance of Rain: 88%
Wind: 20.6 mph
UV Index: 1.8

Astronomical

Sun
10h 9m daylight
Sunrise 6:27 AM
Solar Noon 11:32 AM
Sunset 4:37 PM
Moon
Waning Crescent • 1%
Moonrise 4:49 AM
Transit 10:11 AM
Moonset 3:24 PM

Best Times for Fishing or Hunting

Major Periods

9:41 AM - 12:11 PM
10:03 PM - 12:33 AM

Minor Periods

4:19 AM - 5:49 AM
2:54 PM - 4:24 PM
Action Rating:
Good Action 3/5
Sunday, November 8, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 53.7°F
Average Humidity: 70%
Chance of Rain: 36%
Wind: 24.2 mph
UV Index: 1.1

Astronomical

Sun
10h 7m daylight
Sunrise 6:29 AM
Solar Noon 11:32 AM
Sunset 4:36 PM
Moon
New • 0%
Moonrise 5:55 AM
Transit 10:57 AM
Moonset 3:51 PM

Best Times for Fishing or Hunting

Major Periods

10:27 AM - 12:57 PM
10:50 PM - 1:20 AM

Minor Periods

5:25 AM - 6:55 AM
3:21 PM - 4:51 PM
Action Rating:
Peak Action 5/5
Monday, November 9, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 51.8°F
Average Humidity: 65%
Chance of Rain: 17%
Wind: 23.5 mph
UV Index: 1.9

Astronomical

Sun
10h 5m daylight
Sunrise 6:30 AM
Solar Noon 11:32 AM
Sunset 4:35 PM
Moon
New • 2%
Moonrise 7:01 AM
Transit 11:45 AM
Moonset 4:23 PM

Best Times for Fishing or Hunting

Major Periods

11:15 AM - 1:45 PM
11:40 PM - 2:10 AM

Minor Periods

6:31 AM - 8:01 AM
3:53 PM - 5:23 PM
Action Rating:
Very Good 4/5
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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