Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

73.6°F

Measurement Time: Sunday, June 21, 2026, 12:45 PM 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

78.1°F
Partly Cloudy
Partly Cloudy
78°F
79.7°F
40%
W 11 mph
18.8 mph
80.3°F
51°F
0 in
0%
9 mi
1010 mbar
2

Five Day Weather Forecast

Sunny
Sun
H: 86°F
L: 58°F
Moderate rain
Mon
H: 70°F
L: 61°F
Moderate rain
Tue
H: 68°F
L: 62°F
Sunny
Wed
H: 79°F
L: 60°F
Sunny
Thu
H: 76°F
L: 60°F

Air Quality

AQI: 1 - Good
PM2.5: 14.5 μg/m3
PM10: 18.5 μg/m3
Carbon Monoxide: 104 μg/m3
Nitrogen Dioxide: 6.5 μg/m3
Sulphur Dioxide: 0.7 μg/m3
Ozone: 114 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:51 AM
Sunset: 8:26 PM
Daylight: 15 hrs 10 mins
Moonrise: 12:43 AM
Moon Transit: 6:48 PM
Moonset: 12:23 AM
Moon Phase: First Quarter
Moon Illumination: 38.5%

Best Times for Fishing or Hunting

Major Periods

8:22 AM - 10:52 AM
6:18 PM - 8:48 PM

Minor Periods

12:13 AM - 1:43 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Small Craft Advisory issued June 21 at 2:26PM EDT until June 23 at 6:00AM EDT by NWS Upton NY

Effective: Sun June 21, 2026, 2:26 PM
Expires: Mon June 22, 2026, 6:00 AM

* WHAT...South winds 15 to 20 kt with gusts up to 30 kt and seas 3 to 5 feet expected. * WHERE...Fire Island Inlet NY to Montauk Point NY out 20 nm. * WHEN...From 6 PM Monday to 6 AM EDT Tuesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Sunday, June 21, 2026

Weather Forecast

Sunny
86.2°F
57.9°F
71.4°F
52%
0 in
2%
0%
11 mph
7.8


Air Quality

AQI: 1 - Good
PM2.5: 7.76 μg/m3
PM10: 9.28 μg/m3
Carbon Monoxide: 112.08 μg/m3
Nitrogen Dioxide: 7.68 μg/m3
Sulphur Dioxide: 0.67 μg/m3
Ozone: 81.58 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:51 AM
Sunset: 8:26 PM
Daylight: 15 hrs 10 mins
Moonrise: 12:43 AM
Moon Transit: 6:48 PM
Moonset: 12:23 AM
Moon Phase: First Quarter
Moon Illumination: 38.5%

Best Times for Fishing or Hunting

Major Periods

8:22 AM - 10:52 AM
6:18 PM - 8:48 PM

Minor Periods

12:13 AM - 1:43 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Monday, June 22, 2026

Weather Forecast

Moderate rain
70°F
60.8°F
64.5°F
75%
0.43 in
76%
0%
13.2 mph
1.6


Air Quality

AQI: 1 - Good
PM2.5: 11.83 μg/m3
PM10: 15.05 μg/m3
Carbon Monoxide: 138.04 μg/m3
Nitrogen Dioxide: 7.73 μg/m3
Sulphur Dioxide: 0.51 μg/m3
Ozone: 82.54 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:51 AM
Sunset: 8:27 PM
Daylight: 15 hrs 10 mins
Moonrise: 1:48 PM
Moon Transit: 7:30 PM
Moonset: 12:44 AM
Moon Phase: First Quarter
Moon Illumination: 49.7%

Best Times for Fishing or Hunting

Major Periods

9:05 AM - 11:35 AM
7:00 PM - 9:30 PM

Minor Periods

1:18 PM - 2:48 PM
12:14 AM - 1:44 AM

Action Rating: 2 out of 5

Tuesday, June 23, 2026

Weather Forecast

Moderate rain
68°F
62.1°F
65.9°F
95%
0.56 in
92%
0%
9.6 mph
2.3


Air Quality

AQI: 1 - Good
PM2.5: 7.56 μg/m3
PM10: 9.13 μg/m3
Carbon Monoxide: 135.53 μg/m3
Nitrogen Dioxide: 6.9 μg/m3
Sulphur Dioxide: 0.5 μg/m3
Ozone: 97.5 μg/m3

Astronomical

Sunrise: 5:17 AM
Sun Transit: 12:51 AM
Sunset: 8:27 PM
Daylight: 15 hrs 10 mins
Moonrise: 2:52 PM
Moon Transit: 8:13 PM
Moonset: 1:04 AM
Moon Phase: First Quarter
Moon Illumination: 61.0%

Best Times for Fishing or Hunting

Major Periods

9:47 AM - 12:17 AM
7:43 PM - 10:13 PM

Minor Periods

2:22 PM - 3:52 PM
12:34 AM - 2:04 AM

Action Rating: 2 out of 5

Wednesday, June 24, 2026

Weather Forecast

Sunny
78.9°F
60°F
69.1°F
66%
0 in
5%
0%
11.2 mph
8.7


Air Quality

AQI: 1 - Good
PM2.5: 5.29 μg/m3
PM10: 6.12 μg/m3
Carbon Monoxide: 185.79 μg/m3
Nitrogen Dioxide: 7.53 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 77.38 μg/m3

Astronomical

Sunrise: 5:17 AM
Sun Transit: 12:51 AM
Sunset: 8:27 PM
Daylight: 15 hrs 10 mins
Moonrise: 3:56 PM
Moon Transit: 8:57 PM
Moonset: 1:26 AM
Moon Phase: First Quarter
Moon Illumination: 71.7%

Best Times for Fishing or Hunting

Major Periods

10:30 AM - 1:00 PM
8:27 PM - 10:57 PM

Minor Periods

3:26 PM - 4:56 PM
12:56 AM - 2:26 AM

Action Rating: 3 out of 5

Thursday, June 25, 2026

Weather Forecast

Sunny
75.9°F
60.4°F
68.4°F
66%
0 in
5%
0%
11.6 mph
1.1


Air Quality

AQI: 1 - Good
PM2.5: 4.78 μg/m3
PM10: 5.22 μg/m3
Carbon Monoxide: 155.67 μg/m3
Nitrogen Dioxide: 7.89 μg/m3
Sulphur Dioxide: 0.39 μg/m3
Ozone: 53.67 μg/m3

Astronomical

Sunrise: 5:17 AM
Sun Transit: 12:52 AM
Sunset: 8:27 PM
Daylight: 15 hrs 10 mins
Moonrise: 5:00 PM
Moon Transit: 9:43 PM
Moonset: 1:51 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 81.2%

Best Times for Fishing or Hunting

Major Periods

11:15 AM - 1:45 PM
9:13 PM - 11:43 PM

Minor Periods

4:30 PM - 6:00 PM
1:21 AM - 2:51 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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