Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

75.2°F

Measurement Time: Wednesday, July 29, 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

69.4°F
Clear
Clear
59°F
69.4°F
92%
SE 5.6 mph
9.4 mph
69.4°F
67.1°F
0 in
4%
5 mi
1005 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 73°F
L: 66°F
Patchy rain nearby
Thu
H: 70°F
L: 63°F
Partly Cloudy
Fri
H: 75°F
L: 61°F
Sunny
Sat
H: 76°F
L: 63°F
Partly Cloudy
Sun
H: 75°F
L: 65°F

Air Quality

AQI: 1 - Good
PM2.5: 9.8 μg/m3
PM10: 15.4 μg/m3
Carbon Monoxide: 101 μg/m3
Nitrogen Dioxide: 1.1 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 78 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 12:55 AM
Sunset: 8:10 PM
Daylight: 14 hrs 28 mins
Moonrise: 8:28 PM
Moon Transit: 12:39 AM
Moonset: 5:26 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:09 AM - 2:39 AM
2:58 PM - 5:28 PM

Minor Periods

7:58 PM - 9:28 PM
4:56 AM - 6:26 AM

Action Rating: 4 out of 5

Flood Watch issued July 29 at 3:02AM EDT until July 29 at 2:00PM EDT by NWS Upton NY

Effective: Wed July 29, 2026, 3:02 AM
Expires: Wed July 29, 2026, 2:00 PM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of southern Connecticut, including the following areas, Northern New London and Southern New London. * WHEN...Until 2 PM EDT this afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - A slow moving low pressure system is bringing periods of heavy showers and thunderstorms to the area this morning. Additional rainfall of 1 to 2 inches, with locally higher amounts, could lead to flooding. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.


Small Craft Advisory issued July 28 at 2:35PM EDT until July 29 at 2:00PM EDT by NWS Upton NY

Effective: Tue July 28, 2026, 2:35 PM
Expires: Wed July 29, 2026, 6:00 AM

* WHAT...Southeast winds 10 to 15 kt with gusts up to 25 kt. * WHERE...Long Island Sound east of Port Jefferson and New Haven, and Peconic and Gardiners Bays. * WHEN...From 6 PM this evening to 2 PM EDT Wednesday. * 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 29 at 3:03AM EDT until July 29 at 2:00PM EDT by NWS Upton NY

Effective: Wed July 29, 2026, 3:03 AM
Expires: Wed July 29, 2026, 2:00 PM

* WHAT...Southeast winds 10 to 20 kt with gusts up to 25 kt. * WHERE...Long Island Sound east of Port Jefferson and New Haven, and Peconic and Gardiners Bays. * WHEN...Until 2 PM EDT this afternoon. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Wednesday, July 29, 2026

Weather Forecast

Sunny
73.4°F
65.9°F
70.1°F
91%
1.44 in
88%
0%
11.9 mph
5.3


Air Quality

AQI: 1 - Good
PM2.5: 7.7 μg/m3
PM10: 10.99 μg/m3
Carbon Monoxide: 109.21 μg/m3
Nitrogen Dioxide: 2.15 μg/m3
Sulphur Dioxide: 0.35 μg/m3
Ozone: 84.96 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 12:55 AM
Sunset: 8:10 PM
Daylight: 14 hrs 28 mins
Moonrise: 8:28 PM
Moon Transit: 12:39 AM
Moonset: 5:26 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:09 AM - 2:39 AM
2:58 PM - 5:28 PM

Minor Periods

7:58 PM - 9:28 PM
4:56 AM - 6:26 AM

Action Rating: 4 out of 5

Thursday, July 30, 2026

Weather Forecast

Patchy rain nearby
70.1°F
63.1°F
65.9°F
90%
0.04 in
71%
0%
11.4 mph
2.1


Air Quality

AQI: 1 - Good
PM2.5: 2.57 μg/m3
PM10: 2.72 μg/m3
Carbon Monoxide: 124.92 μg/m3
Nitrogen Dioxide: 4.13 μg/m3
Sulphur Dioxide: 0.58 μg/m3
Ozone: 65.83 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

Partly Cloudy
75.2°F
60.9°F
67.8°F
78%
0 in
13%
0%
8.7 mph
6.4


Air Quality

AQI: 1 - Good
PM2.5: 2.94 μg/m3
PM10: 3.19 μg/m3
Carbon Monoxide: 127.42 μg/m3
Nitrogen Dioxide: 3.71 μg/m3
Sulphur Dioxide: 0.64 μg/m3
Ozone: 95.58 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
76.2°F
63.1°F
69.5°F
78%
0 in
9%
0%
10.1 mph
8.6


Air Quality

AQI: 1 - Good
PM2.5: 9.18 μg/m3
PM10: 10.75 μg/m3
Carbon Monoxide: 158.15 μg/m3
Nitrogen Dioxide: 5.06 μg/m3
Sulphur Dioxide: 0.9 μg/m3
Ozone: 111.38 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
75°F
64.7°F
70°F
85%
0 in
16%
0%
8.5 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 14.03 μg/m3
PM10: 18.47 μg/m3
Carbon Monoxide: 209.67 μg/m3
Nitrogen Dioxide: 3.33 μg/m3
Sulphur Dioxide: 1.24 μg/m3
Ozone: 119 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

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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