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

49.8°F
Clear
Conditions: Clear
Humidity: 72%
Feels Like: 45.7°F
Wind: SW 4.7 mph
Wind Gusts: 15.7 mph
Pressure: 29.82 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 14 mi
UV Index: 0

Weather Forecast

Overcast
Tue
H: 57°F
L: 42°F
Overcast
Wed
H: 56°F
L: 42°F
Light Rain Showers
Thu
H: 55°F
L: 41°F
Moderate Drizzle
Fri
H: 50°F
L: 41°F
Moderate Drizzle
Sat
H: 43°F
L: 38°F

Air Quality

EPA Index 1 • Good

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

PM2.5
10 μg/m³
Good
PM10
11.5 μg/m³
Good
Ozone (O3)
58 μg/m³
Photochemical
NO2
16.6 μg/m³
Nitrogen Dioxide
SO2
2.4 μg/m³
Sulfur Dioxide
CO
199 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 3m daylight
Sunrise 6:31 AM
Solar Noon 11:32 AM
Sunset 4:34 PM
Moon
New • 0%
Moonrise 8:06 AM
Transit 12:35 PM
Moonset 5:00 PM

Best Times for Fishing or Hunting

Major Periods

12:05 PM - 2:35 PM
11:39 PM - 2:09 AM

Minor Periods

7:36 AM - 9:06 AM
4:30 PM - 6:00 PM
Action Rating:
Very Good 4/5
Tuesday, November 10, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 48.6°F
Average Humidity: 69%
Chance of Rain: 1%
Wind: 9.8 mph
UV Index: 3.2

Air Quality

EPA Index 1 • Good
PM2.5
6.3 μg/m³
Good
PM10
6.7 μg/m³
Good
Ozone (O3)
56 μg/m³
Photochemical
NO2
9.7 μg/m³
Nitrogen Dioxide
SO2
1.4 μg/m³
Sulfur Dioxide
CO
171.1 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 3m daylight
Sunrise 6:31 AM
Solar Noon 11:32 AM
Sunset 4:34 PM
Moon
New • 0%
Moonrise 8:06 AM
Transit 12:35 PM
Moonset 5:00 PM

Best Times for Fishing or Hunting

Major Periods

12:05 PM - 2:35 PM
11:39 PM - 2:09 AM

Minor Periods

7:36 AM - 9:06 AM
4:30 PM - 6:00 PM
Action Rating:
Very Good 4/5
Wednesday, November 11, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 48.4°F
Average Humidity: 74%
Chance of Rain: 1%
Wind: 8.1 mph
UV Index: 3.3

Air Quality

EPA Index 1 • Good
PM2.5
3.5 μg/m³
Good
PM10
4.2 μg/m³
Good
Ozone (O3)
62.6 μg/m³
Photochemical
NO2
5.8 μg/m³
Nitrogen Dioxide
SO2
1.1 μg/m³
Sulfur Dioxide
CO
195.9 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 0m daylight
Sunrise 6:32 AM
Solar Noon 11:32 AM
Sunset 4:33 PM
Moon
New • 2%
Moonrise 9:06 AM
Transit 1:26 PM
Moonset 5:45 PM

Best Times for Fishing or Hunting

Major Periods

12:30 AM - 3:00 AM
12:56 PM - 3:26 PM

Minor Periods

8:36 AM - 10:06 AM
5:15 PM - 6:45 PM
Action Rating:
Good Action 3/5
Thursday, November 12, 2026

Weather Forecast

Conditions: Light Rain Showers
Average Temperature: 48.4°F
Average Humidity: 88%
Chance of Rain: 79%
Wind: 15.1 mph
UV Index: 1.4

Air Quality

EPA Index 1 • Good
PM2.5
7.4 μg/m³
Good
PM10
10.9 μg/m³
Good
Ozone (O3)
73.9 μg/m³
Photochemical
NO2
2.3 μg/m³
Nitrogen Dioxide
SO2
0.8 μg/m³
Sulfur Dioxide
CO
157.8 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 58m daylight
Sunrise 6:33 AM
Solar Noon 11:32 AM
Sunset 4:32 PM
Moon
Waxing Crescent • 6%
Moonrise 10:00 AM
Transit 2:18 PM
Moonset 6:37 PM

Best Times for Fishing or Hunting

Major Periods

1:22 AM - 3:52 AM
1:48 PM - 4:18 PM

Minor Periods

9:30 AM - 11:00 AM
6:07 PM - 7:37 PM
Action Rating:
Good Action 3/5
Friday, November 13, 2026

Weather Forecast

Conditions: Moderate Drizzle
Average Temperature: 45.5°F
Average Humidity: 92%
Chance of Rain: 83%
Wind: 15.6 mph
UV Index: 1.4

Air Quality

EPA Index 1 • Good
PM2.5
1 μg/m³
Good
PM10
1.3 μg/m³
Good
Ozone (O3)
70.8 μg/m³
Photochemical
NO2
4 μg/m³
Nitrogen Dioxide
SO2
0.3 μg/m³
Sulfur Dioxide
CO
136.3 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 56m daylight
Sunrise 6:35 AM
Solar Noon 11:32 AM
Sunset 4:31 PM
Moon
Waxing Crescent • 13%
Moonrise 10:46 AM
Transit 3:08 PM
Moonset 7:35 PM

Best Times for Fishing or Hunting

Major Periods

2:13 AM - 4:43 AM
2:38 PM - 5:08 PM

Minor Periods

10:16 AM - 11:46 AM
7:05 PM - 8:35 PM
Action Rating:
Fair Action 2/5
Saturday, November 14, 2026

Weather Forecast

Conditions: Moderate Drizzle
Average Temperature: 40.6°F
Average Humidity: 91%
Chance of Rain: 38%
Wind: 10.7 mph
UV Index: 1.2

Air Quality

EPA Index 1 • Good
PM2.5
0.8 μg/m³
Good
PM10
0.9 μg/m³
Good
Ozone (O3)
58.8 μg/m³
Photochemical
NO2
3 μg/m³
Nitrogen Dioxide
SO2
0.7 μg/m³
Sulfur Dioxide
CO
142.5 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 54m daylight
Sunrise 6:36 AM
Solar Noon 11:32 AM
Sunset 4:30 PM
Moon
Waxing Crescent • 21%
Moonrise 11:24 AM
Transit 3:57 PM
Moonset 8:37 PM

Best Times for Fishing or Hunting

Major Periods

3:03 AM - 5:33 AM
3:27 PM - 5:57 PM

Minor Periods

10:54 AM - 12:24 PM
8:07 PM - 9:37 PM
Action Rating:
Fair Action 2/5
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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