Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

69.3°F

Measurement Time: Thursday, September 18, 2025, 5:45 AM EDT

Temperature Locations

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Local Points of Interest

Ferry Landing State Park

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Connecticut River

Station Name: CONNECTICUT RIVER AT OLD LYME, CT
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 20 feet / 6 meters

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 (8.0 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 (27.0 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

68.2°F
Overcast
Conditions: Overcast
Humidity: 88%
Feels Like: 68.2°F
Wind: N 5.6 mph
Wind Gusts: 8.3 mph
Pressure: 29.99 in
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 9 mi
UV Index: 0.9

Five Day Weather Forecast

Patchy rain nearby
Thu
H: 83°F
L: 62°F
Partly Cloudy
Fri
H: 79°F
L: 62°F
Sunny
Sat
H: 70°F
L: 50°F
Sunny
Sun
H: 67°F
L: 52°F
Sunny
Mon
H: 67°F
L: 49°F

Air Quality

AQI: 1 - Good
PM2.5: 14.25 μg/m3
PM10: 18.87 μg/m3
Carbon Monoxide: 307.1 μg/m3
Nitrogen Dioxide: 7.03 μg/m3
Sulphur Dioxide: 2.22 μg/m3
Ozone: 99 μg/m3

Astronomical

Sunrise: 6:33 AM
Sun Transit: 12:43 AM
Sunset: 6:53 PM
Daylight: 12 hrs 20 mins
Moonrise: 2:58 AM
Moon Transit: 10:24 AM
Moonset: 5:37 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:54 AM - 12:24 AM

Minor Periods

5:07 PM - 6:37 PM
2:28 AM - 3:58 AM

Action Rating: 3 out of 5

Thursday, September 18, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 68.3°F
Average Humidity: 86%
Chance of Rain: 79%
Wind: 8.3 mph
UV Index: 0.8

Air Quality

AQI: 1 - Good
PM2.5: 11.31 μg/m3
PM10: 15.66 μg/m3
Carbon Monoxide: 347.95 μg/m3
Nitrogen Dioxide: 10.35 μg/m3
Sulphur Dioxide: 1.78 μg/m3
Ozone: 78.16 μg/m3

Astronomical

Sunrise: 6:33 AM
Sun Transit: 12:43 AM
Sunset: 6:53 PM
Daylight: 12 hrs 20 mins
Moonrise: 2:58 AM
Moon Transit: 10:24 AM
Moonset: 5:37 PM
Moon Phase: Waning Crescent
Moon Illumination: 7.8%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:54 AM - 12:24 AM

Minor Periods

5:07 PM - 6:37 PM
2:28 AM - 3:58 AM

Action Rating: 3 out of 5

Friday, September 19, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 68.8°F
Average Humidity: 74%
Chance of Rain: 0%
Wind: 8.9 mph
UV Index: 1.4

Air Quality

AQI: 2 - Moderate
PM2.5: 16.33 μg/m3
PM10: 17.46 μg/m3
Carbon Monoxide: 410.18 μg/m3
Nitrogen Dioxide: 31.72 μg/m3
Sulphur Dioxide: 4.97 μg/m3
Ozone: 87.76 μg/m3

Astronomical

Sunrise: 6:34 AM
Sun Transit: 12:43 AM
Sunset: 6:51 PM
Daylight: 12 hrs 17 mins
Moonrise: 4:08 AM
Moon Transit: 11:10 AM
Moonset: 6:01 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.8%

Best Times for Fishing or Hunting

Major Periods

12:43 AM - 3:13 AM
10:40 AM - 1:10 PM

Minor Periods

5:31 PM - 7:01 PM
3:38 AM - 5:08 AM

Action Rating: 3 out of 5

Saturday, September 20, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 59.4°F
Average Humidity: 57%
Chance of Rain: 0%
Wind: 12.5 mph
UV Index: 1.4

Air Quality

AQI: 1 - Good
PM2.5: 6.5 μg/m3
PM10: 7.65 μg/m3
Carbon Monoxide: 320.72 μg/m3
Nitrogen Dioxide: 10.35 μg/m3
Sulphur Dioxide: 2.25 μg/m3
Ozone: 78.52 μg/m3

Astronomical

Sunrise: 6:35 AM
Sun Transit: 12:42 AM
Sunset: 6:50 PM
Daylight: 12 hrs 14 mins
Moonrise: 5:14 AM
Moon Transit: 11:53 AM
Moonset: 6:21 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.3%

Best Times for Fishing or Hunting

Major Periods

1:27 AM - 3:57 AM
11:23 AM - 1:53 PM

Minor Periods

5:51 PM - 7:21 PM
4:44 AM - 6:14 AM

Action Rating: 3 out of 5

Sunday, September 21, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 58.9°F
Average Humidity: 67%
Chance of Rain: 0%
Wind: 12.8 mph
UV Index: 1.3

Air Quality

AQI: 1 - Good
PM2.5: 7.93 μg/m3
PM10: 12.14 μg/m3
Carbon Monoxide: 305.03 μg/m3
Nitrogen Dioxide: 2.45 μg/m3
Sulphur Dioxide: 1.04 μg/m3
Ozone: 84.8 μg/m3

Astronomical

Sunrise: 6:36 AM
Sun Transit: 12:42 AM
Sunset: 6:48 PM
Daylight: 12 hrs 12 mins
Moonrise: 6:19 AM
Moon Transit: 12:35 AM
Moonset: 6:40 PM
Moon Phase: New
Moon Illumination: 0.3%

Best Times for Fishing or Hunting

Major Periods

2:09 AM - 4:39 AM
12:05 AM - 2:35 PM

Minor Periods

6:10 PM - 7:40 PM
5:49 AM - 7:19 AM

Action Rating: 3 out of 5

Monday, September 22, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 58.4°F
Average Humidity: 71%
Chance of Rain: 0%
Wind: 8.3 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 11.85 μg/m3
PM10: 18.87 μg/m3
Carbon Monoxide: 266.4 μg/m3
Nitrogen Dioxide: 3.2 μg/m3
Sulphur Dioxide: 1 μg/m3
Ozone: 81.54 μg/m3

Astronomical

Sunrise: 6:37 AM
Sun Transit: 12:41 AM
Sunset: 6:46 PM
Daylight: 12 hrs 9 mins
Moonrise: 7:22 AM
Moon Transit: 1:15 PM
Moonset: 6:59 PM
Moon Phase: New
Moon Illumination: 2.9%

Best Times for Fishing or Hunting

Major Periods

2:50 AM - 5:20 AM
12:45 AM - 3:15 PM

Minor Periods

6:29 PM - 7:59 PM
6:52 AM - 8:22 AM

Action Rating: 5 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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