Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

73.4°F

Measurement Time: Monday, July 13, 2026, 5:45 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

73°F
Sunny
Sunny
76.7°F
79.2°F
73%
SW 6.5 mph
8.5 mph
77°F
62.4°F
0 in
0%
9 mi
1024 mbar
4.6

Five Day Weather Forecast

Sunny
Mon
H: 88°F
L: 62°F
Sunny
Tue
H: 86°F
L: 68°F
Sunny
Wed
H: 90°F
L: 71°F
Sunny
Thu
H: 83°F
L: 65°F
Sunny
Fri
H: 79°F
L: 60°F

Air Quality

AQI: 1 - Good
PM2.5: 11.1 μg/m3
PM10: 14.6 μg/m3
Carbon Monoxide: 153 μg/m3
Nitrogen Dioxide: 7.9 μg/m3
Sulphur Dioxide: 1.5 μg/m3
Ozone: 73 μg/m3

Astronomical

Sunrise: 5:28 AM
Sun Transit: 12:55 AM
Sunset: 8:23 PM
Daylight: 14 hrs 55 mins
Moonrise: 4:03 AM
Moon Transit: 12:12 AM
Moonset: 8:14 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

1:36 AM - 4:06 AM
11:42 AM - 2:12 PM

Minor Periods

7:44 PM - 9:14 PM
3:33 AM - 5:03 AM

Action Rating: 4 out of 5

Heat Advisory issued July 13 at 2:37AM EDT until July 15 at 8:00PM EDT by NWS Boston/Norton MA

Effective: Mon July 13, 2026, 2:37 AM
Expires: Mon July 13, 2026, 6:00 PM

* WHAT...Heat index values up to 103 expected. * WHERE...Portions of northern Connecticut, central, eastern, northeastern, southeastern, and western Massachusetts, and northern and southern Rhode Island. * WHEN...From 11 AM Tuesday to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Temperatures Tuesday night likely remain near 80 for most of southern New England, leading to poor overnight relief.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.


Small Craft Advisory issued July 13 at 2:36AM EDT until July 15 at 11:00AM EDT by NWS Upton NY

Effective: Mon July 13, 2026, 2:36 AM
Expires: Mon July 13, 2026, 4:00 PM

* WHAT...Southwest winds 15 to 25 kt with gusts up to 30 kt and seas 4 to 7 feet expected. * WHERE...Fire Island Inlet NY to Montauk Point NY out 20 nm. * WHEN...From noon Tuesday to 11 AM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Monday, July 13, 2026

Weather Forecast

Sunny
87.8°F
61.7°F
73.5°F
70%
0 in
5%
0%
14.3 mph
8.5


Air Quality

AQI: 1 - Good
PM2.5: 8.99 μg/m3
PM10: 13.18 μg/m3
Carbon Monoxide: 143.17 μg/m3
Nitrogen Dioxide: 4.23 μg/m3
Sulphur Dioxide: 0.83 μg/m3
Ozone: 84.29 μg/m3

Astronomical

Sunrise: 5:28 AM
Sun Transit: 12:55 AM
Sunset: 8:23 PM
Daylight: 14 hrs 55 mins
Moonrise: 4:03 AM
Moon Transit: 12:12 AM
Moonset: 8:14 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

1:36 AM - 4:06 AM
11:42 AM - 2:12 PM

Minor Periods

7:44 PM - 9:14 PM
3:33 AM - 5:03 AM

Action Rating: 4 out of 5

Tuesday, July 14, 2026

Weather Forecast

Sunny
86.1°F
67.7°F
76.5°F
66%
0 in
5%
0%
17.2 mph
9.3


Air Quality

AQI: 1 - Good
PM2.5: 12.16 μg/m3
PM10: 15.46 μg/m3
Carbon Monoxide: 155.42 μg/m3
Nitrogen Dioxide: 6.17 μg/m3
Sulphur Dioxide: 1.13 μg/m3
Ozone: 107.96 μg/m3

Astronomical

Sunrise: 5:28 AM
Sun Transit: 12:55 AM
Sunset: 8:22 PM
Daylight: 14 hrs 54 mins
Moonrise: 5:21 AM
Moon Transit: 1:16 PM
Moonset: 8:59 PM
Moon Phase: New
Moon Illumination: 1.9%

Best Times for Fishing or Hunting

Major Periods

2:42 AM - 5:12 AM
12:46 AM - 3:16 PM

Minor Periods

8:29 PM - 9:59 PM
4:51 AM - 6:21 AM

Action Rating: 5 out of 5

Wednesday, July 15, 2026

Weather Forecast

Sunny
90.2°F
71.3°F
80.5°F
59%
0 in
4%
0%
17 mph
9.4


Air Quality

AQI: 1 - Good
PM2.5: 7.74 μg/m3
PM10: 8.33 μg/m3
Carbon Monoxide: 147.29 μg/m3
Nitrogen Dioxide: 4.95 μg/m3
Sulphur Dioxide: 1.1 μg/m3
Ozone: 109.54 μg/m3

Astronomical

Sunrise: 5:29 AM
Sun Transit: 12:55 AM
Sunset: 8:21 PM
Daylight: 14 hrs 52 mins
Moonrise: 6:43 AM
Moon Transit: 2:14 PM
Moonset: 9:33 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

3:43 AM - 6:13 AM
1:44 PM - 4:14 PM

Minor Periods

9:03 PM - 10:33 PM
6:13 AM - 7:43 AM

Action Rating: 3 out of 5

Thursday, July 16, 2026

Weather Forecast

Sunny
82.8°F
64.7°F
74.8°F
59%
0.02 in
36%
0%
13.6 mph
7.8


Air Quality

AQI: 1 - Good
PM2.5: 7.12 μg/m3
PM10: 7.53 μg/m3
Carbon Monoxide: 140.37 μg/m3
Nitrogen Dioxide: 5.15 μg/m3
Sulphur Dioxide: 0.55 μg/m3
Ozone: 101.21 μg/m3

Astronomical

Sunrise: 5:30 AM
Sun Transit: 12:55 AM
Sunset: 8:21 PM
Daylight: 14 hrs 51 mins
Moonrise: 8:02 AM
Moon Transit: 3:08 PM
Moonset: 10:01 PM
Moon Phase: New
Moon Illumination: 2.4%

Best Times for Fishing or Hunting

Major Periods

4:38 AM - 7:08 AM
2:38 PM - 5:08 PM

Minor Periods

9:31 PM - 11:01 PM
7:32 AM - 9:02 AM

Action Rating: 3 out of 5

Friday, July 17, 2026

Weather Forecast

Sunny
78.9°F
60.1°F
69.8°F
55%
0 in
3%
0%
12.5 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 5.22 μg/m3
PM10: 5.3 μg/m3
Carbon Monoxide: 173.44 μg/m3
Nitrogen Dioxide: 5.63 μg/m3
Sulphur Dioxide: 0.48 μg/m3
Ozone: 67 μg/m3

Astronomical

Sunrise: 5:31 AM
Sun Transit: 12:55 AM
Sunset: 8:20 PM
Daylight: 14 hrs 49 mins
Moonrise: 9:16 AM
Moon Transit: 3:56 PM
Moonset: 10:25 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.0%

Best Times for Fishing or Hunting

Major Periods

5:30 AM - 8:00 AM
3:26 PM - 5:56 PM

Minor Periods

9:55 PM - 11:25 PM
8:46 AM - 10:16 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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