Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

69.3°F

Measurement Time: Wednesday, October 8, 2025, 10:45 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

66.9°F
Partly cloudy
Conditions: Partly cloudy
Humidity: 56%
Feels Like: 66.9°F
Wind: NNW 14.5 mph
Wind Gusts: 19.7 mph
Pressure: 29.99 in
Precipitation: 0 in
Cloud Cover: 75%
Visibility: 9 mi
UV Index: 0.8

Five Day Weather Forecast

Patchy rain nearby
Wed
H: 70°F
L: 51°F
Sunny
Thu
H: 59°F
L: 45°F
Sunny
Fri
H: 58°F
L: 37°F
Cloudy
Sat
H: 65°F
L: 51°F
Moderate rain
Sun
H: 58°F
L: 54°F

Air Quality

AQI: 1 - Good
PM2.5: 3.05 μg/m3
PM10: 3.05 μg/m3
Carbon Monoxide: 175.85 μg/m3
Nitrogen Dioxide: 4.35 μg/m3
Sulphur Dioxide: 1.75 μg/m3
Ozone: 80 μg/m3

Astronomical

Sunrise: 6:54 AM
Sun Transit: 12:36 AM
Sunset: 6:19 PM
Daylight: 11 hrs 25 mins
Moonrise: 6:57 PM
Moon Transit: 1:28 AM
Moonset: 8:45 AM
Moon Phase: Full
Moon Illumination: 95.8%

Best Times for Fishing or Hunting

Major Periods

12:58 AM - 3:28 AM
3:52 PM - 6:22 PM

Minor Periods

6:27 PM - 7:57 PM
8:15 AM - 9:45 AM

Action Rating: 5 out of 5

Freeze Watch issued October 8 at 2:40AM EDT until October 10 at 9:00AM EDT by NWS Upton NY

Effective: Wed October 8, 2025, 2:40 AM
Expires: Wed October 8, 2025, 4:00 PM

* WHAT...Sub-freezing temperatures as low as 28 possible. * WHERE...In Connecticut, Northern Fairfield, Northern Middlesex, Northern New Haven, and Northern New London Counties. In New Jersey, Western Passaic County. In New York, Northern Westchester, Orange, Putnam, and Rockland Counties. * WHEN...From late Thursday night through Friday morning. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation.

Take steps now to protect tender plants from the cold.


Freeze Watch issued October 8 at 1:45PM EDT until October 10 at 9:00AM EDT by NWS Upton NY

Effective: Wed October 8, 2025, 1:45 PM
Expires: Thu October 9, 2025, 4:00 AM

* WHAT...Sub-freezing temperatures as low as 29 possible. * WHERE...In Connecticut, Northern Fairfield, Northern Middlesex, Northern New Haven, and Northern New London Counties. In New Jersey, Western Passaic County. In New York, Northern Westchester, Orange, Putnam, and Rockland Counties. * WHEN...From late Thursday night through Friday morning. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation.

Take steps now to protect tender plants from the cold.


Freeze Watch issued October 8 at 3:06AM EDT until October 10 at 9:00AM EDT by NWS Boston/Norton MA

Effective: Wed October 8, 2025, 3:06 AM
Expires: Wed October 8, 2025, 4:30 PM

* WHAT...Sub-freezing temperatures as low as 29 possible. * WHERE...Portions of northern Connecticut and central, eastern, southeastern, and southwestern Massachusetts. * WHEN...From Thursday evening through Friday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold.


Freeze Watch issued October 8 at 12:10PM EDT until October 10 at 9:00AM EDT by NWS Boston/Norton MA

Effective: Wed October 8, 2025, 12:10 PM
Expires: Thu October 9, 2025, 6:00 AM

* WHAT...Sub-freezing temperatures as low as 29 possible. * WHERE...Portions of northern Connecticut and central, eastern, southeastern, and western Massachusetts. * WHEN...From Thursday evening through Friday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...The lowest temperatures are expected away from the immediate coastline.

Take steps now to protect tender plants from the cold.


Freeze Watch issued October 8 at 12:10PM EDT until October 10 at 9:00AM EDT by NWS Boston/Norton MA

Effective: Wed October 8, 2025, 12:10 PM
Expires: Thu October 9, 2025, 6:00 AM

* WHAT...Sub-freezing temperatures as low as 29 possible. * WHERE...Providence County, Kent County, Dukes MA, Bristol RI, Washington RI, and Newport RI. * WHEN...From Thursday evening through Friday morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing. * ADDITIONAL DETAILS...The lowest temperatures are expected away from the immediate coastline.

Take steps now to protect tender plants from the cold.
Wednesday, October 8, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 64.8°F
Average Humidity: 78%
Chance of Rain: 89%
Wind: 19.7 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 4.91 μg/m3
PM10: 6.6 μg/m3
Carbon Monoxide: 145.69 μg/m3
Nitrogen Dioxide: 4.11 μg/m3
Sulphur Dioxide: 1.56 μg/m3
Ozone: 76.8 μg/m3

Astronomical

Sunrise: 6:54 AM
Sun Transit: 12:36 AM
Sunset: 6:19 PM
Daylight: 11 hrs 25 mins
Moonrise: 6:57 PM
Moon Transit: 1:28 AM
Moonset: 8:45 AM
Moon Phase: Full
Moon Illumination: 95.8%

Best Times for Fishing or Hunting

Major Periods

12:58 AM - 3:28 AM
3:52 PM - 6:22 PM

Minor Periods

6:27 PM - 7:57 PM
8:15 AM - 9:45 AM

Action Rating: 5 out of 5

Thursday, October 9, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 51.2°F
Average Humidity: 50%
Chance of Rain: 0%
Wind: 15.4 mph
UV Index: 0.9

Air Quality

AQI: 1 - Good
PM2.5: 2.76 μg/m3
PM10: 2.81 μg/m3
Carbon Monoxide: 150.49 μg/m3
Nitrogen Dioxide: 3.88 μg/m3
Sulphur Dioxide: 1.89 μg/m3
Ozone: 71.96 μg/m3

Astronomical

Sunrise: 6:55 AM
Sun Transit: 12:36 AM
Sunset: 6:18 PM
Daylight: 11 hrs 23 mins
Moonrise: 7:34 PM
Moon Transit: 2:24 AM
Moonset: 10:07 AM
Moon Phase: Waning Gibbous
Moon Illumination: 90.1%

Best Times for Fishing or Hunting

Major Periods

1:54 AM - 4:24 AM
4:51 PM - 7:21 PM

Minor Periods

7:04 PM - 8:34 PM
9:37 AM - 11:07 AM

Action Rating: 2 out of 5

Friday, October 10, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 48.4°F
Average Humidity: 52%
Chance of Rain: 0%
Wind: 8.9 mph
UV Index: 0.9

Air Quality

AQI: 1 - Good
PM2.5: 3.41 μg/m3
PM10: 4.01 μg/m3
Carbon Monoxide: 171.69 μg/m3
Nitrogen Dioxide: 3.96 μg/m3
Sulphur Dioxide: 2.04 μg/m3
Ozone: 81.12 μg/m3

Astronomical

Sunrise: 6:56 AM
Sun Transit: 12:36 AM
Sunset: 6:16 PM
Daylight: 11 hrs 20 mins
Moonrise: 8:21 PM
Moon Transit: 3:25 AM
Moonset: 11:28 AM
Moon Phase: Waning Gibbous
Moon Illumination: 82.3%

Best Times for Fishing or Hunting

Major Periods

2:55 AM - 5:25 AM
5:54 PM - 8:24 PM

Minor Periods

7:51 PM - 9:21 PM
10:58 AM - 12:28 AM

Action Rating: 3 out of 5

Saturday, October 11, 2025

Weather Forecast

Conditions: Cloudy
Average Temperature: 56.3°F
Average Humidity: 71%
Chance of Rain: 0%
Wind: 8.5 mph
UV Index: 0.6

Air Quality

AQI: 1 - Good
PM2.5: 7.36 μg/m3
PM10: 10.35 μg/m3
Carbon Monoxide: 218.77 μg/m3
Nitrogen Dioxide: 3.96 μg/m3
Sulphur Dioxide: 1.79 μg/m3
Ozone: 87.24 μg/m3

Astronomical

Sunrise: 6:57 AM
Sun Transit: 12:36 AM
Sunset: 6:14 PM
Daylight: 11 hrs 17 mins
Moonrise: 9:18 PM
Moon Transit: 4:28 AM
Moonset: 12:42 AM
Moon Phase: Waning Gibbous
Moon Illumination: 72.9%

Best Times for Fishing or Hunting

Major Periods

3:58 AM - 6:28 AM
6:58 PM - 9:28 PM

Minor Periods

8:48 PM - 10:18 PM
12:12 AM - 1:42 PM

Action Rating: 3 out of 5

Sunday, October 12, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 55.5°F
Average Humidity: 83%
Chance of Rain: 74%
Wind: 33.6 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 5.91 μg/m3
PM10: 8.44 μg/m3
Carbon Monoxide: 210.7 μg/m3
Nitrogen Dioxide: 3.83 μg/m3
Sulphur Dioxide: 1.84 μg/m3
Ozone: 80.77 μg/m3

Astronomical

Sunrise: 6:58 AM
Sun Transit: 12:35 AM
Sunset: 6:13 PM
Daylight: 11 hrs 15 mins
Moonrise: 10:25 PM
Moon Transit: 5:32 AM
Moonset: 1:44 PM
Moon Phase: Waning Gibbous
Moon Illumination: 62.3%

Best Times for Fishing or Hunting

Major Periods

5:02 AM - 7:32 AM
8:00 PM - 10:30 PM

Minor Periods

9:55 PM - 11:25 PM
1:14 PM - 2:44 PM

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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