Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

77.9°F

Measurement Time: Thursday, August 6, 2026, 8:45 AM EDT

Temperature Locations

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Local Points of Interest

Ferry Landing State Park

Connecticut River

Station Name: CONNECTICUT RIVER AT OLD LYME, CT
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 20 feet

Nearest Address:
336 Ferry Rd
Old Lyme, CT 06371
New London County

GPS Coordinates: 41.3125983, -72.3459166

Nearby Water Temperatures

East Branch Eightmile River, Lyme, CT (8 mi)
Eightmile River, East Haddam, CT (8.9 mi)
Orient Harbor, Orient, NY (12.3 mi)
Thames River, New London, CT (13.6 mi)
Thames River, Groton, CT (13.9 mi)
Mystic River, Noank, CT (18.8 mi)
Connecticut River, Middletown, CT (19.1 mi)
Mystic Harbor, Mystic, CT (19.7 mi)
Mystic River, Mystic, CT (19.9 mi)
Mystic River, Old Mystic, CT (20.4 mi)
Yantic River, Norwich, CT (20.6 mi)
Pawcatuck River, Westerly, RI (27 mi)
Fort Pond Bay, Montauk, NY (27.2 mi)
Quinnipiac River, Wallingford, CT (27.4 mi)
New Haven Harbor, New Haven, CT (29.3 mi)

Weather for Old Lyme, Connecticut

Current Weather

85.6°F
Sunny
Sunny
100°F
99.7°F
84%
SW 8.9 mph
13.1 mph
85.6°F
80.1°F
0 in
17%
6 mi
1019 mbar
8.9

Five Day Weather Forecast

Sunny
Thu
H: 90°F
L: 73°F
Sunny
Fri
H: 85°F
L: 72°F
Partly Cloudy
Sat
H: 83°F
L: 69°F
Sunny
Sun
H: 85°F
L: 69°F
Sunny
Mon
H: 81°F
L: 67°F

Air Quality

AQI: 1 - Good
PM2.5: 10.4 μg/m3
PM10: 14.1 μg/m3
Carbon Monoxide: 143 μg/m3
Nitrogen Dioxide: 4.3 μg/m3
Sulphur Dioxide: 0.8 μg/m3
Ozone: 94 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 12:55 AM
Sunset: 8:00 PM
Daylight: 14 hrs 11 mins
Moonrise: 12:13 AM
Moon Transit: 6:47 AM
Moonset: 2:35 PM
Moon Phase: Last Quarter
Moon Illumination: 32.3%

Best Times for Fishing or Hunting

Major Periods

6:17 AM - 8:47 AM
9:13 PM - 11:43 PM

Minor Periods

2:05 PM - 3:35 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Heat Advisory issued August 6 at 2:26AM EDT until August 7 at 8:00PM EDT by NWS Upton NY

Effective: Thu August 6, 2026, 2:26 AM
Expires: Thu August 6, 2026, 10:30 AM

* WHAT...Heat index values up to 104 expected. * WHERE...Nassau and Suffolk Counties on Long Island in southeast New York. * WHEN...From 11 AM this morning to 8 PM EDT Friday. * IMPACTS...Heat and high humidity may cause heat related illnesses. * ADDITIONAL DETAILS...The advisory will likely need to be extended into the Saturday through Tuesday time frame as heat and humidity persist.

A Heat Advisory is issued when the combination of heat and humidity is expected to make it feel like it is 95 to 99 degrees for two or more consecutive days, or 100 to 104 degrees for any length of time. Seniors and those with chronic health problems or mental health conditions are at an increased risk. Homes without air conditioning can be much hotter than outdoor temperatures. Use air conditioning to stay cool at home or go to a place that has air conditioning. If you don't have home air conditioning, continue to seek out cool spaces each day as long as it remains hot, and for a few days after if your home is still hot. Check on vulnerable friends, family members and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.


Thursday, August 6, 2026

Weather Forecast

Sunny
90.3°F
73°F
80.1°F
90%
0 in
19%
0%
10.5 mph
8.9


Air Quality

AQI: 1 - Good
PM2.5: 8.68 μg/m3
PM10: 12.06 μg/m3
Carbon Monoxide: 126.71 μg/m3
Nitrogen Dioxide: 4.36 μg/m3
Sulphur Dioxide: 0.81 μg/m3
Ozone: 81.58 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 12:55 AM
Sunset: 8:00 PM
Daylight: 14 hrs 11 mins
Moonrise: 12:13 AM
Moon Transit: 6:47 AM
Moonset: 2:35 PM
Moon Phase: Last Quarter
Moon Illumination: 32.3%

Best Times for Fishing or Hunting

Major Periods

6:17 AM - 8:47 AM
9:13 PM - 11:43 PM

Minor Periods

2:05 PM - 3:35 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Friday, August 7, 2026

Weather Forecast

Sunny
84.7°F
71.9°F
77.4°F
81%
0.1 in
63%
0%
8.9 mph
8.5


Air Quality

AQI: 1 - Good
PM2.5: 10.92 μg/m3
PM10: 12.52 μg/m3
Carbon Monoxide: 175.13 μg/m3
Nitrogen Dioxide: 9.18 μg/m3
Sulphur Dioxide: 1.25 μg/m3
Ozone: 110.88 μg/m3

Astronomical

Sunrise: 5:51 AM
Sun Transit: 12:55 AM
Sunset: 7:59 PM
Daylight: 14 hrs 9 mins
Moonrise: 12:51 AM
Moon Transit: 7:46 AM
Moonset: 3:50 PM
Moon Phase: Last Quarter
Moon Illumination: 22.2%

Best Times for Fishing or Hunting

Major Periods

7:16 AM - 9:46 AM
12:00 AM - 12:00 AM

Minor Periods

3:20 PM - 4:50 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Saturday, August 8, 2026

Weather Forecast

Partly Cloudy
82.9°F
69.3°F
74.5°F
84%
0.25 in
76%
0%
22.1 mph
7.9


Air Quality

AQI: 1 - Good
PM2.5: 9.34 μg/m3
PM10: 10.16 μg/m3
Carbon Monoxide: 165.21 μg/m3
Nitrogen Dioxide: 6.37 μg/m3
Sulphur Dioxide: 1.39 μg/m3
Ozone: 121.5 μg/m3

Astronomical

Sunrise: 5:52 AM
Sun Transit: 12:55 AM
Sunset: 7:58 PM
Daylight: 14 hrs 6 mins
Moonrise: 12:40 AM
Moon Transit: 8:48 AM
Moonset: 5:01 PM
Moon Phase: Waning Crescent
Moon Illumination: 13.6%

Best Times for Fishing or Hunting

Major Periods

8:18 AM - 10:48 AM
12:00 AM - 12:00 AM

Minor Periods

4:31 PM - 6:01 PM
12:10 AM - 1:40 AM

Action Rating: 2 out of 5

Sunday, August 9, 2026

Weather Forecast

Sunny
85°F
69.4°F
76.8°F
74%
0 in
17%
0%
11.6 mph
8.1


Air Quality

AQI: 1 - Good
PM2.5: 11.83 μg/m3
PM10: 13.15 μg/m3
Carbon Monoxide: 180.5 μg/m3
Nitrogen Dioxide: 7.25 μg/m3
Sulphur Dioxide: 1.43 μg/m3
Ozone: 126.5 μg/m3

Astronomical

Sunrise: 5:53 AM
Sun Transit: 12:54 AM
Sunset: 7:56 PM
Daylight: 14 hrs 4 mins
Moonrise: 1:42 AM
Moon Transit: 9:53 AM
Moonset: 6:02 PM
Moon Phase: Waning Crescent
Moon Illumination: 6.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:23 AM - 11:53 AM

Minor Periods

5:32 PM - 7:02 PM
1:12 AM - 2:42 AM

Action Rating: 2 out of 5

Monday, August 10, 2026

Weather Forecast

Sunny
80.8°F
67.1°F
73.4°F
65%
0.07 in
57%
0%
7.2 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 11.14 μg/m3
PM10: 11.43 μg/m3
Carbon Monoxide: 302.44 μg/m3
Nitrogen Dioxide: 11.42 μg/m3
Sulphur Dioxide: 1.08 μg/m3
Ozone: 69 μg/m3

Astronomical

Sunrise: 5:54 AM
Sun Transit: 12:54 AM
Sunset: 7:55 PM
Daylight: 14 hrs 2 mins
Moonrise: 2:55 AM
Moon Transit: 10:57 AM
Moonset: 6:51 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.2%

Best Times for Fishing or Hunting

Major Periods

12:23 AM - 2:53 AM
10:27 AM - 12:57 AM

Minor Periods

6:21 PM - 7:51 PM
2:25 AM - 3:55 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.

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