Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

76.5°F

Measurement Time: Thursday, July 30, 2026, 12:45 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

67.6°F
Mist
Mist
54.1°F
67.6°F
94%
NE 11.2 mph
16.1 mph
67.6°F
65.9°F
0 in
75%
6 mi
1005 mbar
0

Five Day Weather Forecast

Patchy rain nearby
Thu
H: 72°F
L: 64°F
Sunny
Fri
H: 74°F
L: 61°F
Sunny
Sat
H: 78°F
L: 67°F
Partly Cloudy
Sun
H: 78°F
L: 69°F
Sunny
Mon
H: 74°F
L: 65°F

Air Quality

AQI: 1 - Good
PM2.5: 10.1 μg/m3
PM10: 11.4 μg/m3
Carbon Monoxide: 110 μg/m3
Nitrogen Dioxide: 8.3 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 86 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 12:55 AM
Sunset: 8:08 PM
Daylight: 14 hrs 26 mins
Moonrise: 8:52 PM
Moon Transit: 1:25 AM
Moonset: 6:32 AM
Moon Phase: Full
Moon Illumination: 97.1%

Best Times for Fishing or Hunting

Major Periods

12:55 AM - 3:25 AM
3:43 PM - 6:13 PM

Minor Periods

8:22 PM - 9:52 PM
6:02 AM - 7:32 AM

Action Rating: 5 out of 5

Small Craft Advisory issued July 29 at 3:35PM EDT until July 30 at 6:00AM EDT by NWS Upton NY

Effective: Wed July 29, 2026, 3:35 PM
Expires: Thu July 30, 2026, 5:00 AM

* WHAT...Seas 4 to 6 feet. * WHERE...Moriches Inlet NY to Montauk Point NY out 20 NM. * WHEN...Until 6 AM EDT Thursday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Thursday, July 30, 2026

Weather Forecast

Patchy rain nearby
71.8°F
63.6°F
68.2°F
91%
0.02 in
55%
0%
13.4 mph
2.1


Air Quality

AQI: 1 - Good
PM2.5: 6.45 μg/m3
PM10: 7.4 μg/m3
Carbon Monoxide: 114.92 μg/m3
Nitrogen Dioxide: 4.68 μg/m3
Sulphur Dioxide: 0.87 μg/m3
Ozone: 91.42 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 12:55 AM
Sunset: 8:08 PM
Daylight: 14 hrs 26 mins
Moonrise: 8:52 PM
Moon Transit: 1:25 AM
Moonset: 6:32 AM
Moon Phase: Full
Moon Illumination: 97.1%

Best Times for Fishing or Hunting

Major Periods

12:55 AM - 3:25 AM
3:43 PM - 6:13 PM

Minor Periods

8:22 PM - 9:52 PM
6:02 AM - 7:32 AM

Action Rating: 5 out of 5

Friday, July 31, 2026

Weather Forecast

Sunny
74.2°F
61.1°F
68.1°F
83%
0.13 in
71%
0%
7.6 mph
6.4


Air Quality

AQI: 1 - Good
PM2.5: 4.61 μg/m3
PM10: 5.07 μg/m3
Carbon Monoxide: 128.79 μg/m3
Nitrogen Dioxide: 3.46 μg/m3
Sulphur Dioxide: 0.6 μg/m3
Ozone: 83.21 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 12:55 AM
Sunset: 8:07 PM
Daylight: 14 hrs 24 mins
Moonrise: 9:14 PM
Moon Transit: 2:10 AM
Moonset: 7:37 AM
Moon Phase: Full
Moon Illumination: 92.0%

Best Times for Fishing or Hunting

Major Periods

1:40 AM - 4:10 AM
4:27 PM - 6:57 PM

Minor Periods

8:44 PM - 10:14 PM
7:07 AM - 8:37 AM

Action Rating: 3 out of 5

Saturday, August 1, 2026

Weather Forecast

Sunny
78.4°F
67°F
72.1°F
83%
0.03 in
48%
0%
11 mph
8.6


Air Quality

AQI: 2 - Moderate
PM2.5: 16.98 μg/m3
PM10: 20.55 μg/m3
Carbon Monoxide: 159.83 μg/m3
Nitrogen Dioxide: 6.23 μg/m3
Sulphur Dioxide: 1.28 μg/m3
Ozone: 112.63 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 12:55 AM
Sunset: 8:06 PM
Daylight: 14 hrs 22 mins
Moonrise: 9:35 PM
Moon Transit: 2:53 AM
Moonset: 8:43 AM
Moon Phase: Waning Gibbous
Moon Illumination: 84.9%

Best Times for Fishing or Hunting

Major Periods

2:23 AM - 4:53 AM
5:10 PM - 7:40 PM

Minor Periods

9:05 PM - 10:35 PM
8:13 AM - 9:43 AM

Action Rating: 3 out of 5

Sunday, August 2, 2026

Weather Forecast

Partly Cloudy
77.8°F
68.6°F
72.6°F
87%
0 in
25%
0%
13 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 9.8 μg/m3
PM10: 13.93 μg/m3
Carbon Monoxide: 122.78 μg/m3
Nitrogen Dioxide: 1.85 μg/m3
Sulphur Dioxide: 0.63 μg/m3
Ozone: 84.04 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 12:55 AM
Sunset: 8:05 PM
Daylight: 14 hrs 20 mins
Moonrise: 9:56 PM
Moon Transit: 3:36 AM
Moonset: 9:49 AM
Moon Phase: Waning Gibbous
Moon Illumination: 75.9%

Best Times for Fishing or Hunting

Major Periods

3:06 AM - 5:36 AM
5:53 PM - 8:23 PM

Minor Periods

9:26 PM - 10:56 PM
9:19 AM - 10:49 AM

Action Rating: 4 out of 5

Monday, August 3, 2026

Weather Forecast

Sunny
73.8°F
64.5°F
69.7°F
86%
0.82 in
86%
0%
13.6 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 8.97 μg/m3
PM10: 12.83 μg/m3
Carbon Monoxide: 184.33 μg/m3
Nitrogen Dioxide: 2.88 μg/m3
Sulphur Dioxide: 0.87 μg/m3
Ozone: 74 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 12:55 AM
Sunset: 8:04 PM
Daylight: 14 hrs 17 mins
Moonrise: 10:18 PM
Moon Transit: 12:00 AM
Moonset: 10:56 AM
Moon Phase: Waning Gibbous
Moon Illumination: 65.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
6:38 PM - 9:08 PM

Minor Periods

9:48 PM - 11:18 PM
10:26 AM - 11:56 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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