Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

70.7°F

Measurement Time: Friday, September 12, 2025, 6:45 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

71.6°F
Partly Cloudy
Conditions: Partly Cloudy
Humidity: 46%
Feels Like: 76.2°F
Wind: NE 5.8 mph
Wind Gusts: 6.9 mph
Pressure: 30.24 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 2.7

Five Day Weather Forecast

Sunny
Fri
H: 77°F
L: 62°F
Sunny
Sat
H: 75°F
L: 53°F
Moderate rain
Sun
H: 80°F
L: 63°F
Patchy rain nearby
Mon
H: 73°F
L: 60°F
Patchy rain nearby
Tue
H: 72°F
L: 63°F

Air Quality

AQI: 2 - Moderate
PM2.5: 14.25 μg/m3
PM10: 18.69 μg/m3
Carbon Monoxide: 333 μg/m3
Nitrogen Dioxide: 4.63 μg/m3
Sulphur Dioxide: 1.85 μg/m3
Ozone: 120 μg/m3

Astronomical

Sunrise: 6:27 AM
Sun Transit: 12:45 AM
Sunset: 7:03 PM
Daylight: 12 hrs 36 mins
Moonrise: 9:38 PM
Moon Transit: 4:36 AM
Moonset: 12:28 AM
Moon Phase: Waning Gibbous
Moon Illumination: 67.4%

Best Times for Fishing or Hunting

Major Periods

4:06 AM - 6:36 AM
7:03 PM - 9:33 PM

Minor Periods

9:08 PM - 10:38 PM
11:58 AM - 1:28 PM

Action Rating: 4 out of 5

Coastal Flood Statement issued September 12 at 2:40AM EDT until September 12 at 5:00PM EDT by NWS Upton NY

Effective: Fri September 12, 2025, 2:40 AM
Expires: Fri September 12, 2025, 4:00 PM

* WHAT...Up to one half foot of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...Southern Fairfield County. * WHEN...With the high tide cycle this afternoon. High tide occurs between 3 and 4 PM. * IMPACTS...Brief minor flooding of the more vulnerable locations near the waterfront and shoreline.

Do not drive through flooded roadways.
Friday, September 12, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 67.3°F
Average Humidity: 65%
Chance of Rain: 0%
Wind: 10.5 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 12.79 μg/m3
PM10: 14.81 μg/m3
Carbon Monoxide: 402.34 μg/m3
Nitrogen Dioxide: 21.31 μg/m3
Sulphur Dioxide: 2.74 μg/m3
Ozone: 87.92 μg/m3

Astronomical

Sunrise: 6:27 AM
Sun Transit: 12:45 AM
Sunset: 7:03 PM
Daylight: 12 hrs 36 mins
Moonrise: 9:38 PM
Moon Transit: 4:36 AM
Moonset: 12:28 AM
Moon Phase: Waning Gibbous
Moon Illumination: 67.4%

Best Times for Fishing or Hunting

Major Periods

4:06 AM - 6:36 AM
7:03 PM - 9:33 PM

Minor Periods

9:08 PM - 10:38 PM
11:58 AM - 1:28 PM

Action Rating: 4 out of 5

Saturday, September 13, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 63.7°F
Average Humidity: 66%
Chance of Rain: 0%
Wind: 11.2 mph
UV Index: 1.2

Air Quality

AQI: 1 - Good
PM2.5: 12.48 μg/m3
PM10: 17.92 μg/m3
Carbon Monoxide: 337.07 μg/m3
Nitrogen Dioxide: 3.55 μg/m3
Sulphur Dioxide: 1.06 μg/m3
Ozone: 83.08 μg/m3

Astronomical

Sunrise: 6:28 AM
Sun Transit: 12:45 AM
Sunset: 7:01 PM
Daylight: 12 hrs 33 mins
Moonrise: 10:27 PM
Moon Transit: 5:36 AM
Moonset: 1:44 PM
Moon Phase: Waning Gibbous
Moon Illumination: 56.4%

Best Times for Fishing or Hunting

Major Periods

5:06 AM - 7:36 AM
8:04 PM - 10:34 PM

Minor Periods

9:57 PM - 11:27 PM
1:14 PM - 2:44 PM

Action Rating: 2 out of 5

Sunday, September 14, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 70°F
Average Humidity: 72%
Chance of Rain: 79%
Wind: 8.7 mph
UV Index: 1.1

Air Quality

AQI: 2 - Moderate
PM2.5: 16.41 μg/m3
PM10: 22.45 μg/m3
Carbon Monoxide: 370.3 μg/m3
Nitrogen Dioxide: 9.89 μg/m3
Sulphur Dioxide: 3.03 μg/m3
Ozone: 98.12 μg/m3

Astronomical

Sunrise: 6:29 AM
Sun Transit: 12:44 AM
Sunset: 7:00 PM
Daylight: 12 hrs 30 mins
Moonrise: 11:26 PM
Moon Transit: 6:38 AM
Moonset: 2:52 PM
Moon Phase: Last Quarter
Moon Illumination: 45.1%

Best Times for Fishing or Hunting

Major Periods

6:08 AM - 8:38 AM
9:06 PM - 11:36 PM

Minor Periods

12:00 AM - 12:00 AM
2:22 PM - 3:52 PM

Action Rating: 3 out of 5

Monday, September 15, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 66.2°F
Average Humidity: 79%
Chance of Rain: 87%
Wind: 7.4 mph
UV Index: 0.1

Air Quality

AQI: 2 - Moderate
PM2.5: 23.1 μg/m3
PM10: 27.17 μg/m3
Carbon Monoxide: 475.89 μg/m3
Nitrogen Dioxide: 14.75 μg/m3
Sulphur Dioxide: 2.86 μg/m3
Ozone: 116.96 μg/m3

Astronomical

Sunrise: 6:30 AM
Sun Transit: 12:44 AM
Sunset: 6:58 PM
Daylight: 12 hrs 28 mins
Moonrise: 12:26 AM
Moon Transit: 7:39 AM
Moonset: 3:49 PM
Moon Phase: Last Quarter
Moon Illumination: 34.0%

Best Times for Fishing or Hunting

Major Periods

7:09 AM - 9:39 AM
12:00 AM - 12:00 AM

Minor Periods

3:19 PM - 4:49 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Tuesday, September 16, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 67.3°F
Average Humidity: 79%
Chance of Rain: 87%
Wind: 9.2 mph
UV Index: 4

Air Quality

AQI: 2 - Moderate
PM2.5: 19.94 μg/m3
PM10: 26.38 μg/m3
Carbon Monoxide: 354.77 μg/m3
Nitrogen Dioxide: 11.61 μg/m3
Sulphur Dioxide: 2.97 μg/m3
Ozone: 94.54 μg/m3

Astronomical

Sunrise: 6:31 AM
Sun Transit: 12:44 AM
Sunset: 6:56 PM
Daylight: 12 hrs 25 mins
Moonrise: 12:34 AM
Moon Transit: 8:38 AM
Moonset: 4:34 PM
Moon Phase: Last Quarter
Moon Illumination: 23.8%

Best Times for Fishing or Hunting

Major Periods

8:08 AM - 10:38 AM
12:00 AM - 12:00 AM

Minor Periods

4:04 PM - 5:34 PM
12:04 AM - 1:34 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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