Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

77.0°F

Measurement Time: Wednesday, July 22, 2026, 10:45 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

66°F
Partly cloudy
Partly cloudy
66°F
63.7°F
65%
NNW 7.6 mph
13.3 mph
63.7°F
53.2°F
0 in
50%
9 mi
1015 mbar
0

Five Day Weather Forecast

Sunny
Thu
H: 75°F
L: 62°F
Sunny
Fri
H: 75°F
L: 59°F
Sunny
Sat
H: 77°F
L: 59°F
Sunny
Sun
H: 76°F
L: 57°F
Mist
Mon
H: 77°F
L: 65°F

Air Quality

AQI: 1 - Good
PM2.5: 2.3 μg/m3
PM10: 2.3 μg/m3
Carbon Monoxide: 120 μg/m3
Nitrogen Dioxide: 4.4 μg/m3
Sulphur Dioxide: 0.5 μg/m3
Ozone: 62 μg/m3

Astronomical

Sunrise: 5:36 AM
Sun Transit: 12:55 AM
Sunset: 8:15 PM
Daylight: 14 hrs 39 mins
Moonrise: 3:54 PM
Moon Transit: 8:27 PM
Moonset: 12:22 AM
Moon Phase: First Quarter
Moon Illumination: 66.1%

Best Times for Fishing or Hunting

Major Periods

9:58 AM - 12:28 AM
7:57 PM - 10:27 PM

Minor Periods

3:24 PM - 4:54 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Small Craft Advisory issued July 22 at 6:59PM EDT until July 23 at 4:00PM EDT by NWS Upton NY

Effective: Wed July 22, 2026, 6:59 PM
Expires: Thu July 23, 2026, 8:00 AM

* WHAT...Winds becoming North 10 to 15 kt. Gusts up to 25 kt early. Seas 4 to 7 feet. * WHERE...Fire Island Inlet NY to Montauk Point NY out 20 nm. * WHEN...Until 4 PM EDT Thursday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.


Small Craft Advisory issued July 22 at 3:26PM EDT until July 23 at 4:00PM EDT by NWS Upton NY

Effective: Wed July 22, 2026, 3:26 PM
Expires: Thu July 23, 2026, 4:30 AM

* WHAT...North winds 15 to 25 kt and seas 4 to 7 feet. * WHERE...Fire Island Inlet NY to Montauk Point NY out 20 nm. * WHEN...Until 4 PM 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 23, 2026

Weather Forecast

Sunny
75°F
61.5°F
67.9°F
64%
0 in
4%
0%
10.1 mph
8.3


Air Quality

AQI: 1 - Good
PM2.5: 3.28 μg/m3
PM10: 3.48 μg/m3
Carbon Monoxide: 140.63 μg/m3
Nitrogen Dioxide: 4.15 μg/m3
Sulphur Dioxide: 0.46 μg/m3
Ozone: 89.38 μg/m3

Astronomical

Sunrise: 5:36 AM
Sun Transit: 12:55 AM
Sunset: 8:15 PM
Daylight: 14 hrs 39 mins
Moonrise: 3:54 PM
Moon Transit: 8:27 PM
Moonset: 12:22 AM
Moon Phase: First Quarter
Moon Illumination: 66.1%

Best Times for Fishing or Hunting

Major Periods

9:58 AM - 12:28 AM
7:57 PM - 10:27 PM

Minor Periods

3:24 PM - 4:54 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Friday, July 24, 2026

Weather Forecast

Sunny
75.3°F
59.1°F
67.4°F
66%
0 in
5%
0%
8.7 mph
8.3


Air Quality

AQI: 1 - Good
PM2.5: 8.98 μg/m3
PM10: 11.05 μg/m3
Carbon Monoxide: 163.88 μg/m3
Nitrogen Dioxide: 6.63 μg/m3
Sulphur Dioxide: 0.81 μg/m3
Ozone: 99.75 μg/m3

Astronomical

Sunrise: 5:37 AM
Sun Transit: 12:55 AM
Sunset: 8:14 PM
Daylight: 14 hrs 38 mins
Moonrise: 4:56 PM
Moon Transit: 9:17 PM
Moonset: 12:55 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

10:48 AM - 1:18 PM
8:47 PM - 11:17 PM

Minor Periods

4:26 PM - 5:56 PM
12:25 AM - 1:55 AM

Action Rating: 2 out of 5

Saturday, July 25, 2026

Weather Forecast

Sunny
76.8°F
58.7°F
67.5°F
61%
0 in
4%
0%
7.8 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 7.8 μg/m3
PM10: 10.6 μg/m3
Carbon Monoxide: 126.08 μg/m3
Nitrogen Dioxide: 3.09 μg/m3
Sulphur Dioxide: 0.45 μg/m3
Ozone: 93.67 μg/m3

Astronomical

Sunrise: 5:38 AM
Sun Transit: 12:55 AM
Sunset: 8:14 PM
Daylight: 14 hrs 36 mins
Moonrise: 5:52 PM
Moon Transit: 10:08 PM
Moonset: 1:36 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.2%

Best Times for Fishing or Hunting

Major Periods

11:38 AM - 2:08 PM
12:00 AM - 12:00 AM

Minor Periods

5:22 PM - 6:52 PM
1:06 AM - 2:36 AM

Action Rating: 2 out of 5

Sunday, July 26, 2026

Weather Forecast

Sunny
75.9°F
56.5°F
66.6°F
66%
0 in
5%
0%
9.6 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 7.4 μg/m3
PM10: 8.94 μg/m3
Carbon Monoxide: 134.6 μg/m3
Nitrogen Dioxide: 3.8 μg/m3
Sulphur Dioxide: 0.5 μg/m3
Ozone: 109.21 μg/m3

Astronomical

Sunrise: 5:39 AM
Sun Transit: 12:55 AM
Sunset: 8:13 PM
Daylight: 14 hrs 34 mins
Moonrise: 6:42 PM
Moon Transit: 11:00 PM
Moonset: 2:25 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 92.3%

Best Times for Fishing or Hunting

Major Periods

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

Minor Periods

6:12 PM - 7:42 PM
1:55 AM - 3:25 AM

Action Rating: 2 out of 5

Monday, July 27, 2026

Weather Forecast

Mist
76.8°F
65.4°F
70.2°F
84%
0.18 in
78%
0%
13.4 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 6.93 μg/m3
PM10: 7.44 μg/m3
Carbon Monoxide: 181.89 μg/m3
Nitrogen Dioxide: 6.86 μg/m3
Sulphur Dioxide: 0.57 μg/m3
Ozone: 75.67 μg/m3

Astronomical

Sunrise: 5:40 AM
Sun Transit: 12:55 AM
Sunset: 8:12 PM
Daylight: 14 hrs 32 mins
Moonrise: 7:23 PM
Moon Transit: 11:50 PM
Moonset: 3:20 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.2%

Best Times for Fishing or Hunting

Major Periods

1:21 PM - 3:51 PM
12:00 AM - 12:00 AM

Minor Periods

6:53 PM - 8:23 PM
2:50 AM - 4:20 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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