Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

34.3°F

Measurement Time: Wednesday, December 24, 2025, 12:45 PM EST

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

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

34.9°F
Clear
Conditions: Clear
Humidity: 55%
Heat Index: 34.9°F
Feels Like: 28.1°F
Wind: NNW 5.6 mph
Wind Gusts: 12 mph
Wind Chill: 28.1°F
Air Pressure: 1024.55 millibars
Dew Point: 28.1°F
Chance of Precipitation: 0%
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 10 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Wed
H: 44°F
L: 27°F
Overcast
Thu
H: 36°F
L: 26°F
Moderate or heavy snow showers
Fri
H: 29°F
L: 18°F
Moderate or heavy snow showers
Sat
H: 33°F
L: 24°F
Moderate or heavy snow showers
Sun
H: 41°F
L: 24°F

Air Quality

AQI: 1 - Good
PM2.5: 4.95 μg/m3
PM10: 4.95 μg/m3
Carbon Monoxide: 263.85 μg/m3
Nitrogen Dioxide: 13.25 μg/m3
Sulphur Dioxide: 3.85 μg/m3
Ozone: 43 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 11:49 AM
Sunset: 4:25 PM
Daylight: 9 hrs 12 mins
Moonrise: 10:20 AM
Moon Transit: 3:35 PM
Moonset: 9:01 PM
Moon Phase: Waxing Crescent
Moon Illumination: 19.9%

Best Times for Fishing or Hunting

Major Periods

5:08 AM - 7:38 AM
3:05 PM - 5:35 PM

Minor Periods

8:31 PM - 10:01 PM
9:50 AM - 11:20 AM

Action Rating: 3 out of 5

Winter Storm Watch issued December 24 at 1:07PM EST until December 27 at 1:00PM EST by NWS Upton NY

Effective: Wed December 24, 2025, 1:07 PM
Expires: Wed December 24, 2025, 9:15 PM

* WHAT...Heavy snow possible. Total snow accumulations between 4 and 8 inches possible. * WHERE...Portions of southern Connecticut, northeast New Jersey, and southeast New York. * WHEN...From Friday afternoon through Saturday afternoon. * IMPACTS...Plan on slippery road conditions. The hazardous conditions may impact the Friday evening commute.

Monitor the latest forecasts for updates on this situation.
Wednesday, December 24, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 35.8°F
Average Humidity: 74%
Chance of Rain: 0%
Wind: 19.2 mph
UV Index: 0.3

Air Quality

AQI: 1 - Good
PM2.5: 7.29 μg/m3
PM10: 7.52 μg/m3
Carbon Monoxide: 231.45 μg/m3
Nitrogen Dioxide: 20.18 μg/m3
Sulphur Dioxide: 4.89 μg/m3
Ozone: 38.44 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 11:49 AM
Sunset: 4:25 PM
Daylight: 9 hrs 12 mins
Moonrise: 10:20 AM
Moon Transit: 3:35 PM
Moonset: 9:01 PM
Moon Phase: Waxing Crescent
Moon Illumination: 19.9%

Best Times for Fishing or Hunting

Major Periods

5:08 AM - 7:38 AM
3:05 PM - 5:35 PM

Minor Periods

8:31 PM - 10:01 PM
9:50 AM - 11:20 AM

Action Rating: 3 out of 5

Thursday, December 25, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 31°F
Average Humidity: 63%
Chance of Rain: 0%
Wind: 19.2 mph
UV Index: 0.1

Air Quality

AQI: 1 - Good
PM2.5: 7.04 μg/m3
PM10: 7.23 μg/m3
Carbon Monoxide: 264.45 μg/m3
Nitrogen Dioxide: 17.83 μg/m3
Sulphur Dioxide: 5.37 μg/m3
Ozone: 41.52 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 11:49 AM
Sunset: 4:26 PM
Daylight: 9 hrs 12 mins
Moonrise: 10:43 AM
Moon Transit: 4:20 PM
Moonset: 10:08 PM
Moon Phase: Waxing Crescent
Moon Illumination: 29.7%

Best Times for Fishing or Hunting

Major Periods

5:53 AM - 8:23 AM
3:50 PM - 6:20 PM

Minor Periods

9:38 PM - 11:08 PM
10:13 AM - 11:43 AM

Action Rating: 2 out of 5

Friday, December 26, 2025

Weather Forecast

Conditions: Moderate or heavy snow showers
Average Temperature: 23.8°F
Average Humidity: 38%
Chance of Rain: 64%
Wind: 14.5 mph
UV Index: 0.3

Air Quality

AQI: 1 - Good
PM2.5: 2.65 μg/m3
PM10: 2.83 μg/m3
Carbon Monoxide: 168.41 μg/m3
Nitrogen Dioxide: 5.27 μg/m3
Sulphur Dioxide: 2.09 μg/m3
Ozone: 75.4 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 11:50 AM
Sunset: 4:27 PM
Daylight: 9 hrs 13 mins
Moonrise: 11:04 AM
Moon Transit: 12:00 AM
Moonset: 11:16 PM
Moon Phase: First Quarter
Moon Illumination: 40.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

12:00 AM - 12:00 AM
10:34 AM - 12:04 AM

Action Rating: 2 out of 5

Saturday, December 27, 2025

Weather Forecast

Conditions: Moderate or heavy snow showers
Average Temperature: 27.2°F
Average Humidity: 80%
Chance of Rain: 85%
Wind: 15.9 mph
UV Index: 0.3

Air Quality

AQI: 1 - Good
PM2.5: 2.69 μg/m3
PM10: 3.31 μg/m3
Carbon Monoxide: 191.58 μg/m3
Nitrogen Dioxide: 4.53 μg/m3
Sulphur Dioxide: 1.68 μg/m3
Ozone: 77 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 11:50 AM
Sunset: 4:27 PM
Daylight: 9 hrs 13 mins
Moonrise: 11:25 AM
Moon Transit: 4:23 AM
Moonset: 12:16 AM
Moon Phase: First Quarter
Moon Illumination: 51.8%

Best Times for Fishing or Hunting

Major Periods

3:53 AM - 6:23 AM
3:53 AM - 6:23 AM

Minor Periods

10:55 AM - 12:25 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Sunday, December 28, 2025

Weather Forecast

Conditions: Moderate or heavy snow showers
Average Temperature: 30.5°F
Average Humidity: 83%
Chance of Rain: 82%
Wind: 12.8 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 2.98 μg/m3
PM10: 3.73 μg/m3
Carbon Monoxide: 164.67 μg/m3
Nitrogen Dioxide: 4.43 μg/m3
Sulphur Dioxide: 1.66 μg/m3
Ozone: 75.08 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 11:51 AM
Sunset: 4:28 PM
Daylight: 9 hrs 14 mins
Moonrise: 11:48 AM
Moon Transit: 6:37 PM
Moonset: 12:27 AM
Moon Phase: First Quarter
Moon Illumination: 63.0%

Best Times for Fishing or Hunting

Major Periods

8:09 AM - 10:39 AM
6:07 PM - 8:37 PM

Minor Periods

11:18 AM - 12:48 AM
12:00 AM - 12:00 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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