Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

75.4°F

Measurement Time: Tuesday, July 7, 2026, 2:45 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

64.9°F
Overcast
Overcast
64.9°F
64.9°F
97%
NE 13.4 mph
19.5 mph
64.9°F
61.5°F
0 in
100%
9 mi
1016 mbar
0.1

Five Day Weather Forecast

Patchy rain nearby
Tue
H: 70°F
L: 62°F
Sunny
Wed
H: 78°F
L: 63°F
Sunny
Thu
H: 80°F
L: 66°F
Sunny
Fri
H: 83°F
L: 68°F
Sunny
Sat
H: 80°F
L: 65°F

Air Quality

AQI: 1 - Good
PM2.5: 3.3 μg/m3
PM10: 4.9 μg/m3
Carbon Monoxide: 134 μg/m3
Nitrogen Dioxide: 2.1 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 89 μg/m3

Astronomical

Sunrise: 5:23 AM
Sun Transit: 12:54 AM
Sunset: 8:25 PM
Daylight: 15 hrs 2 mins
Moonrise: 12:50 AM
Moon Transit: 6:21 AM
Moonset: 1:05 PM
Moon Phase: Last Quarter
Moon Illumination: 37.3%

Best Times for Fishing or Hunting

Major Periods

5:51 AM - 8:21 AM
8:40 PM - 11:10 PM

Minor Periods

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

Action Rating: 4 out of 5

Small Craft Advisory issued July 6 at 2:45PM EDT until July 7 at 6:00AM EDT by NWS Upton NY

Effective: Mon July 6, 2026, 2:45 PM
Expires: Tue July 7, 2026, 4:00 AM

* WHAT...East winds 15 to 20 kt with gusts up to 30 kt and seas 2 to 4 feet. * WHERE...Long Island Sound, and Peconic and Gardiners Bays. * WHEN...Until 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.


Small Craft Advisory issued July 7 at 3:21AM EDT until July 7 at 6:00AM EDT by NWS Upton NY

Effective: Tue July 7, 2026, 3:21 AM
Expires: Tue July 7, 2026, 6:00 AM

* WHAT...Northeast winds 15 to 20 kt with gusts up to 25 kt and seas 3 to 4 feet. * WHERE...Long Island Sound, and Peconic and Gardiners Bays. * WHEN...Until 6 AM EDT early this morning. * 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 7 at 2:22AM EDT until July 7 at 6:00AM EDT by NWS Upton NY

Effective: Tue July 7, 2026, 2:22 AM
Expires: Tue July 7, 2026, 6:00 AM

* WHAT...Northeast winds 15 to 20 kt with gusts up to 25 kt and seas 2 to 4 feet. * WHERE...Long Island Sound, and Peconic and Gardiners Bays. * WHEN...Until 6 AM EDT early this morning. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Tuesday, July 7, 2026

Weather Forecast

Patchy rain nearby
70.2°F
62.4°F
65.7°F
87%
0.03 in
64%
0%
15.4 mph
1.5


Air Quality

AQI: 1 - Good
PM2.5: 2.94 μg/m3
PM10: 4.03 μg/m3
Carbon Monoxide: 132.42 μg/m3
Nitrogen Dioxide: 2.46 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 87.5 μg/m3

Astronomical

Sunrise: 5:23 AM
Sun Transit: 12:54 AM
Sunset: 8:25 PM
Daylight: 15 hrs 2 mins
Moonrise: 12:50 AM
Moon Transit: 6:21 AM
Moonset: 1:05 PM
Moon Phase: Last Quarter
Moon Illumination: 37.3%

Best Times for Fishing or Hunting

Major Periods

5:51 AM - 8:21 AM
8:40 PM - 11:10 PM

Minor Periods

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

Action Rating: 4 out of 5

Wednesday, July 8, 2026

Weather Forecast

Sunny
77.5°F
62.9°F
69.4°F
77%
0.01 in
36%
0%
12.3 mph
8.5


Air Quality

AQI: 1 - Good
PM2.5: 4.17 μg/m3
PM10: 5.03 μg/m3
Carbon Monoxide: 151.33 μg/m3
Nitrogen Dioxide: 4.79 μg/m3
Sulphur Dioxide: 0.57 μg/m3
Ozone: 86.79 μg/m3

Astronomical

Sunrise: 5:24 AM
Sun Transit: 12:54 AM
Sunset: 8:25 PM
Daylight: 15 hrs 1 mins
Moonrise: 12:14 AM
Moon Transit: 7:08 AM
Moonset: 2:17 PM
Moon Phase: Last Quarter
Moon Illumination: 26.8%

Best Times for Fishing or Hunting

Major Periods

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

Minor Periods

1:47 PM - 3:17 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, July 9, 2026

Weather Forecast

Sunny
79.6°F
66.4°F
72.9°F
83%
0.02 in
40%
0%
16.1 mph
7.5


Air Quality

AQI: 1 - Good
PM2.5: 9.28 μg/m3
PM10: 11.24 μg/m3
Carbon Monoxide: 150.92 μg/m3
Nitrogen Dioxide: 6.94 μg/m3
Sulphur Dioxide: 1.28 μg/m3
Ozone: 87.5 μg/m3

Astronomical

Sunrise: 5:25 AM
Sun Transit: 12:54 AM
Sunset: 8:24 PM
Daylight: 15 hrs mins
Moonrise: 12:41 AM
Moon Transit: 8:00 AM
Moonset: 3:33 PM
Moon Phase: Last Quarter
Moon Illumination: 17.4%

Best Times for Fishing or Hunting

Major Periods

7:30 AM - 10:00 AM
12:00 AM - 12:00 AM

Minor Periods

3:03 PM - 4:33 PM
12:11 AM - 1:41 AM

Action Rating: 2 out of 5

Friday, July 10, 2026

Weather Forecast

Sunny
82.9°F
67.9°F
73.7°F
87%
0.34 in
79%
0%
11.2 mph
5.9


Air Quality

AQI: 1 - Good
PM2.5: 8.4 μg/m3
PM10: 9.56 μg/m3
Carbon Monoxide: 161.69 μg/m3
Nitrogen Dioxide: 6.74 μg/m3
Sulphur Dioxide: 1.12 μg/m3
Ozone: 112 μg/m3

Astronomical

Sunrise: 5:25 AM
Sun Transit: 12:54 AM
Sunset: 8:24 PM
Daylight: 14 hrs 59 mins
Moonrise: 1:14 AM
Moon Transit: 8:56 AM
Moonset: 4:52 PM
Moon Phase: Waning Crescent
Moon Illumination: 9.7%

Best Times for Fishing or Hunting

Major Periods

8:26 AM - 10:56 AM
12:00 AM - 12:00 AM

Minor Periods

4:22 PM - 5:52 PM
12:44 AM - 2:14 AM

Action Rating: 2 out of 5

Saturday, July 11, 2026

Weather Forecast

Sunny
80.4°F
64.6°F
71.6°F
78%
0 in
11%
0%
10.1 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 8.2 μg/m3
PM10: 8.4 μg/m3
Carbon Monoxide: 249.44 μg/m3
Nitrogen Dioxide: 6.73 μg/m3
Sulphur Dioxide: 0.81 μg/m3
Ozone: 69.11 μg/m3

Astronomical

Sunrise: 5:26 AM
Sun Transit: 12:54 AM
Sunset: 8:24 PM
Daylight: 14 hrs 58 mins
Moonrise: 1:57 AM
Moon Transit: 10:00 AM
Moonset: 6:09 PM
Moon Phase: Waning Crescent
Moon Illumination: 4.1%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:30 AM - 12:00 AM

Minor Periods

5:39 PM - 7:09 PM
1:27 AM - 2:57 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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