Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

77.2°F

Measurement Time: Sunday, August 2, 2026, 3:45 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

74.1°F

Conditions: Sunny

Feels Like: 78.4°F

Heat Index: 78.4°F

Humidity: 93%

Wind: S 7.8 mph

Wind Gusts: 12.1 mph

Wind Chill: 74.1°F

Dew Point: 72.1°F

Precipitation: 0 in

Cloud Cover: 23%

Visibility: 6 mi

Air Pressure: 1016 mbar

UV Index: 1.1

Five Day Weather Forecast

Sun
H: 86°F
L: 70°F

Mon
H: 73°F
L: 69°F

Tue
H: 81°F
L: 69°F

Wed
H: 74°F
L: 69°F

Thu
H: 83°F
L: 71°F

Air Quality

AQI: 1 - Good

PM2.5: 9.2 μg/m3

PM10: 13.7 μg/m3

Carbon Monoxide: 123 μg/m3
Nitrogen Dioxide: 2.4 μg/m3
Sulphur Dioxide: 1 μg/m3
Ozone: 91 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

Small Craft Advisory issued August 1 at 1:54PM EDT until August 3 at 8:00PM EDT by NWS Upton NY

Effective: Sat August 1, 2026, 1:54 PM
Expires: Sun August 2, 2026, 5:00 AM

* WHAT...South winds 10 to 15 kt with gusts up to 25 kt and seas 1 to 3 feet expected. * WHERE...Long Island Sound east of Orient Point and the Connecticut River, and South Shore Bays from Jones Inlet through Shinnecock Bay. * WHEN...From 4 AM to 8 PM EDT Monday. * 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 August 2 at 4:58AM EDT until August 3 at 8:00PM EDT by NWS Upton NY

Effective: Sun August 2, 2026, 4:58 AM
Expires: Sun August 2, 2026, 6:00 PM

* WHAT...South winds 10 to 20 kt with gusts up to 30 kt and seas 2 to 4 feet expected. * WHERE...Long Island Sound east of Orient Point and the Connecticut River, and South Shore Bays from Jones Inlet through Shinnecock Bay. * WHEN...From 4 AM to 8 PM EDT Monday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.

Sunday, August 2, 2026

Weather Forecast

Conditions: Sunny

High Temperature: 86°F

Low Temperature: 70°F

Average Temperature: 75.5°F

Average Humidity: 89%

Precipitation: 0.09 in

Chance of Rain: 69%

Chance of Snow: 0%

Maximum Wind: 11.2 mph

UV Index: 7.6

Air Quality

AQI: 1 - Good

PM2.5: 9.71 μg/m3

PM10: 14.65 μg/m3

Carbon Monoxide: 120.25 μg/m3
Nitrogen Dioxide: 2.13 μg/m3
Sulphur Dioxide: 0.83 μg/m3
Ozone: 90.08 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

Monday, August 3, 2026

Weather Forecast

Conditions: Light rain shower

High Temperature: 73.1°F

Low Temperature: 69.4°F

Average Temperature: 71.3°F

Average Humidity: 97%

Precipitation: 1.38 in

Chance of Rain: 93%

Chance of Snow: 0%

Maximum Wind: 14.1 mph

UV Index: 6.4

Air Quality

AQI: 1 - Good

PM2.5: 5.47 μg/m3

PM10: 8.24 μg/m3

Carbon Monoxide: 112.58 μg/m3
Nitrogen Dioxide: 2.15 μg/m3
Sulphur Dioxide: 0.41 μg/m3
Ozone: 83.29 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 12:55 AM
Sunset: 8:04 PM
Daylight: 14 hrs 17 mins

Moonrise: 10:18 PM
Moon Transit: 12:00 AM
Moonset: 10:56 AM
Moon Phase: Waning Gibbous
Moon Illumination: 65.6%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
6:38 PM - 9:08 PM

Minor Periods

9:48 PM - 11:18 PM
10:26 AM - 11:56 AM

Action Rating: 2 out of 5

Tuesday, August 4, 2026

Weather Forecast

Conditions: Fog

High Temperature: 80.5°F

Low Temperature: 69.3°F

Average Temperature: 73.8°F

Average Humidity: 86%

Precipitation: 0.02 in

Chance of Rain: 48%

Chance of Snow: 0%

Maximum Wind: 7.4 mph

UV Index: 8.6

Air Quality

AQI: 1 - Good

PM2.5: 5.43 μg/m3

PM10: 5.82 μg/m3

Carbon Monoxide: 150.79 μg/m3
Nitrogen Dioxide: 4.5 μg/m3
Sulphur Dioxide: 0.64 μg/m3
Ozone: 104.17 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 12:55 AM
Sunset: 8:03 PM
Daylight: 14 hrs 15 mins

Moonrise: 10:43 PM
Moon Transit: 5:05 AM
Moonset: 12:06 AM
Moon Phase: Last Quarter
Moon Illumination: 54.6%

Best Times for Fishing or Hunting

Major Periods

4:35 AM - 7:05 AM
7:25 PM - 9:55 PM

Minor Periods

10:13 PM - 11:43 PM
11:36 AM - 1:06 PM

Action Rating: 2 out of 5

Wednesday, August 5, 2026

Weather Forecast

Conditions: Mist

High Temperature: 73.7°F

Low Temperature: 69.3°F

Average Temperature: 71.6°F

Average Humidity: 96%

Precipitation: 0.11 in

Chance of Rain: 86%

Chance of Snow: 0%

Maximum Wind: 8.9 mph

UV Index: 9.3

Air Quality

AQI: 1 - Good

PM2.5: 6.2 μg/m3

PM10: 8.35 μg/m3

Carbon Monoxide: 156.65 μg/m3
Nitrogen Dioxide: 5.35 μg/m3
Sulphur Dioxide: 0.79 μg/m3
Ozone: 94.96 μg/m3

Astronomical

Sunrise: 5:49 AM
Sun Transit: 12:55 AM
Sunset: 8:02 PM
Daylight: 14 hrs 13 mins

Moonrise: 11:13 PM
Moon Transit: 5:54 AM
Moonset: 1:19 PM
Moon Phase: Last Quarter
Moon Illumination: 43.2%

Best Times for Fishing or Hunting

Major Periods

5:24 AM - 7:54 AM
8:16 PM - 10:46 PM

Minor Periods

12:00 AM - 12:00 AM
12:49 AM - 2:19 PM

Action Rating: 4 out of 5

Thursday, August 6, 2026

Weather Forecast

Conditions: Patchy rain nearby

High Temperature: 83.2°F

Low Temperature: 71.1°F

Average Temperature: 76°F

Average Humidity: 85%

Precipitation: 0.06 in

Chance of Rain: 61%

Chance of Snow: 0%

Maximum Wind: 14.1 mph

UV Index: 7

Air Quality

AQI: 1 - Good

PM2.5: 5.78 μg/m3

PM10: 7.36 μg/m3

Carbon Monoxide: 187.67 μg/m3
Nitrogen Dioxide: 6.11 μg/m3
Sulphur Dioxide: 1.29 μg/m3
Ozone: 83.11 μg/m3

Astronomical

Sunrise: 5:50 AM
Sun Transit: 12:55 AM
Sunset: 8:00 PM
Daylight: 14 hrs 11 mins

Moonrise: 12:13 AM
Moon Transit: 6:47 AM
Moonset: 2:35 PM
Moon Phase: Last Quarter
Moon Illumination: 32.3%

Best Times for Fishing or Hunting

Major Periods

6:17 AM - 8:47 AM
9:13 PM - 11:43 PM

Minor Periods

2:05 PM - 3:35 PM
12:00 AM - 12:00 AM

Action Rating: 3 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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Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

Temperature Locations

Local Points of Interest

Nearby Water Temperatures

Weather for Old Lyme, Connecticut

Current Weather

Five Day Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Small Craft Advisory issued August 1 at 1:54PM EDT until August 3 at 8:00PM EDT by NWS Upton NY

Small Craft Advisory issued August 2 at 4:58AM EDT until August 3 at 8:00PM EDT by NWS Upton NY

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Weather Forecast

Air Quality

Astronomical

Best Times for Fishing or Hunting

Major Periods

Minor Periods

Webcams Near Old Lyme, CT

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