Water Temperature of the Thames River in Groton, CT

Current Water Temperature

35.2°F

Measurement Time: Tuesday, February 3, 2026, 4:15 AM EST

Temperature Locations

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Local Points of Interest

New London, CT

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

30°F
Light snow
Light snow
17.8°F
29.7°F
48%
NW 18.6 mph
26.7 mph
19.8°F
20.2°F
0 in
100%
8 mi
1001 mbar
0

Five Day Weather Forecast

Blowing snow
Mon
H: 33°F
L: 25°F
Sunny
Tue
H: 34°F
L: 15°F
Heavy snow
Wed
H: 36°F
L: 21°F
Overcast
Thu
H: 36°F
L: 27°F
Sunny
Fri
H: 33°F
L: 21°F

Air Quality

AQI: 1 - Good
PM2.5: 4.85 μg/m3
PM10: 5.65 μg/m3
Carbon Monoxide: 161.85 μg/m3
Nitrogen Dioxide: 3.85 μg/m3
Sulphur Dioxide: 2.75 μg/m3
Ozone: 90 μg/m3

Astronomical

Sunrise: 6:32 AM
Sun Transit: 12:01 AM
Sunset: 5:32 PM
Daylight: 11 hrs mins
Moonrise: 9:22 AM
Moon Transit: 5:08 PM
Moonset: 12:50 AM
Moon Phase: First Quarter
Moon Illumination: 39.8%

Best Times for Fishing or Hunting

Major Periods

6:38 AM - 9:08 AM
4:38 PM - 7:08 PM

Minor Periods

8:52 AM - 10:22 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Blizzard Warning issued February 23 at 12:55PM EST until February 23 at 6:00PM EST by NWS Upton NY

Effective: Mon February 23, 2026, 12:55 PM
Expires: Mon February 23, 2026, 6:00 PM

* WHAT...Blizzard conditions. Additional snow accumulations up to two inches. Winds gusting as high as 55 mph. * WHERE...In Connecticut, Southern New London County. In New York, Northeast Suffolk and Southeast Suffolk Counties. * WHEN...Until 6 PM EST this evening. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. Whiteout conditions are expected and will make travel treacherous and potentially life-threatening. The strong winds and weight of snow on tree limbs may down power lines and could cause sporadic power outages. Plan on slippery road conditions. Areas of blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday evening commute. Strong winds could cause tree damage.

Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. Check local Department of Transportation information services for the latest road conditions. A Blizzard Warning means severe winter weather conditions are expected or occurring. Falling and blowing snow with strong winds are likely. This will lead to whiteout conditions, making travel extremely dangerous. Do not travel. If you must travel, have a winter survival kit with you. If you get stranded, stay in your vehicle.


Blizzard Warning issued February 23 at 12:55PM EST until February 23 at 6:00PM EST by NWS Upton NY

Effective: Mon February 23, 2026, 12:55 PM
Expires: Mon February 23, 2026, 6:00 PM

* WHAT...Blizzard conditions. Additional snow accumulations up to two inches. Winds gusting as high as 50 mph. * WHERE...Portions of southern Connecticut and southeast New York. * WHEN...Until 6 PM EST this evening. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. Whiteout conditions are expected and will make travel treacherous and potentially life-threatening. The strong winds and weight of snow on tree limbs may down power lines and could cause sporadic power outages. Plan on slippery road conditions. Areas of blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday evening commute. Gusty winds could bring down tree branches.

Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. Check local Department of Transportation information services for the latest road conditions. A Blizzard Warning means severe winter weather conditions are expected or occurring. Falling and blowing snow with strong winds are likely. This will lead to whiteout conditions, making travel extremely dangerous. Do not travel. If you must travel, have a winter survival kit with you. If you get stranded, stay in your vehicle.


Special Weather Statement issued February 23 at 4:53PM EST by NWS Upton NY

Effective: Mon February 23, 2026, 4:53 PM
Expires: Tue February 24, 2026, 10:00 AM

**Black Ice and Blowing Snow Tonight** Black ice will be possible across the region tonight, especially on any untreated surfaces. Gusty winds may also result in localized reduced visibilities due to blowing snow through Tuesday morning. Take caution if traveling, especially on the Tuesday morning commute.


Blizzard Warning issued February 23 at 12:55PM EST until February 23 at 6:00PM EST by NWS Upton NY

Effective: Mon February 23, 2026, 12:55 PM
Expires: Mon February 23, 2026, 6:00 PM

* WHAT...Blizzard conditions. Additional snow accumulations up to two inches. Winds gusting as high as 45 mph. * WHERE...Portions of southern Connecticut and southeast New York. * WHEN...Until 6 PM EST this evening. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. Whiteout conditions are expected and will make travel treacherous and potentially life-threatening. The strong winds and weight of snow on tree limbs may down power lines and could cause sporadic power outages. Plan on slippery road conditions. Areas of blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday evening commute. Gusty winds could bring down tree branches.

Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. Check local Department of Transportation information services for the latest road conditions. A Blizzard Warning means severe winter weather conditions are expected or occurring. Falling and blowing snow with strong winds are likely. This will lead to whiteout conditions, making travel extremely dangerous. Do not travel. If you must travel, have a winter survival kit with you. If you get stranded, stay in your vehicle.


Blizzard Warning issued February 23 at 3:13AM EST until February 24 at 7:00AM EST by NWS Boston/Norton MA

Effective: Mon February 23, 2026, 3:13 AM
Expires: Mon February 23, 2026, 4:15 PM

* WHAT...Blizzard conditions. Additional snow accumulations between 14 and 21 inches. Winds gusting as high as 75 mph. * WHERE...Portions of eastern and southeastern Massachusetts and Rhode Island. * WHEN...Until 7 AM EST Tuesday. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. The strong winds and weight of snow on tree limbs may down power lines and could cause sporadic power outages. Whiteout conditions are expected and will make travel treacherous and potentially life-threatening. Travel could be very difficult to impossible. Areas of blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning and evening commutes. Very strong winds could cause extensive tree damage.

Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle.


Monday, February 23, 2026

Weather Forecast

Blowing snow
33.1°F
25.3°F
30.6°F
81%
1.37 in
68%
76%
37.6 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 3.53 μg/m3
PM10: 4.64 μg/m3
Carbon Monoxide: 165.09 μg/m3
Nitrogen Dioxide: 3.73 μg/m3
Sulphur Dioxide: 1.92 μg/m3
Ozone: 87.52 μg/m3

Astronomical

Sunrise: 6:32 AM
Sun Transit: 12:01 AM
Sunset: 5:32 PM
Daylight: 11 hrs mins
Moonrise: 9:22 AM
Moon Transit: 5:08 PM
Moonset: 12:50 AM
Moon Phase: First Quarter
Moon Illumination: 39.8%

Best Times for Fishing or Hunting

Major Periods

6:38 AM - 9:08 AM
4:38 PM - 7:08 PM

Minor Periods

8:52 AM - 10:22 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Tuesday, February 24, 2026

Weather Forecast

Sunny
34.2°F
14.8°F
24.7°F
65%
0 in
0%
0%
18.6 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 3.9 μg/m3
PM10: 4.61 μg/m3
Carbon Monoxide: 169.57 μg/m3
Nitrogen Dioxide: 4.03 μg/m3
Sulphur Dioxide: 2.1 μg/m3
Ozone: 83.8 μg/m3

Astronomical

Sunrise: 6:31 AM
Sun Transit: 12:01 AM
Sunset: 5:33 PM
Daylight: 11 hrs 2 mins
Moonrise: 10:04 AM
Moon Transit: 6:08 PM
Moonset: 1:07 AM
Moon Phase: First Quarter
Moon Illumination: 51.1%

Best Times for Fishing or Hunting

Major Periods

7:37 AM - 10:07 AM
5:38 PM - 8:08 PM

Minor Periods

9:34 AM - 11:04 AM
12:37 AM - 2:07 AM

Action Rating: 3 out of 5

Wednesday, February 25, 2026

Weather Forecast

Heavy snow
36.3°F
20.8°F
31.6°F
85%
0.69 in
82%
3%
20.1 mph
0.2


Air Quality

AQI: 1 - Good
PM2.5: 6.77 μg/m3
PM10: 8.11 μg/m3
Carbon Monoxide: 223.17 μg/m3
Nitrogen Dioxide: 8.28 μg/m3
Sulphur Dioxide: 2.81 μg/m3
Ozone: 76.56 μg/m3

Astronomical

Sunrise: 6:29 AM
Sun Transit: 12:01 AM
Sunset: 5:34 PM
Daylight: 11 hrs 5 mins
Moonrise: 10:58 AM
Moon Transit: 7:11 PM
Moonset: 2:20 AM
Moon Phase: First Quarter
Moon Illumination: 62.3%

Best Times for Fishing or Hunting

Major Periods

8:39 AM - 11:09 AM
6:41 PM - 9:11 PM

Minor Periods

10:28 AM - 11:58 AM
1:50 AM - 3:20 AM

Action Rating: 2 out of 5

Thursday, February 26, 2026

Weather Forecast

Overcast
35.6°F
27.4°F
34.2°F
73%
0 in
0%
0%
16.3 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 6.31 μg/m3
PM10: 6.56 μg/m3
Carbon Monoxide: 227.39 μg/m3
Nitrogen Dioxide: 11.13 μg/m3
Sulphur Dioxide: 2.5 μg/m3
Ozone: 73.12 μg/m3

Astronomical

Sunrise: 6:28 AM
Sun Transit: 12:01 AM
Sunset: 5:35 PM
Daylight: 11 hrs 8 mins
Moonrise: 12:03 AM
Moon Transit: 8:13 PM
Moonset: 3:24 AM
Moon Phase: First Quarter
Moon Illumination: 72.9%

Best Times for Fishing or Hunting

Major Periods

9:42 AM - 12:12 AM
7:43 PM - 10:13 PM

Minor Periods

11:33 AM - 1:03 PM
2:54 AM - 4:24 AM

Action Rating: 2 out of 5

Friday, February 27, 2026

Weather Forecast

Sunny
33.4°F
20.9°F
26.8°F
78%
0 in
0%
0%
12.1 mph
0.6


Air Quality

AQI: 1 - Good
PM2.5: 7.49 μg/m3
PM10: 10.01 μg/m3
Carbon Monoxide: 183.14 μg/m3
Nitrogen Dioxide: 5.22 μg/m3
Sulphur Dioxide: 1.7 μg/m3
Ozone: 84.69 μg/m3

Astronomical

Sunrise: 6:26 AM
Sun Transit: 12:01 AM
Sunset: 5:37 PM
Daylight: 11 hrs 11 mins
Moonrise: 1:16 PM
Moon Transit: 9:13 PM
Moonset: 4:17 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.3%

Best Times for Fishing or Hunting

Major Periods

10:43 AM - 1:13 PM
8:43 PM - 11:13 PM

Minor Periods

12:46 AM - 2:16 PM
3:47 AM - 5:17 AM

Action Rating: 2 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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