Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

71.4°F

Measurement Time: Friday, July 17, 2026, 11:45 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

84°F
Sunny
Sunny
81.6°F
87.5°F
27%
W 9.4 mph
15.2 mph
89.6°F
51.7°F
0 in
0%
9 mi
1016 mbar
4.4

Five Day Weather Forecast

Sunny
Fri
H: 90°F
L: 63°F
Sunny
Sat
H: 80°F
L: 65°F
Sunny
Sun
H: 79°F
L: 65°F
Sunny
Mon
H: 75°F
L: 59°F
Sunny
Tue
H: 74°F
L: 64°F

Air Quality

AQI: 1 - Good
PM2.5: 8.1 μg/m3
PM10: 8.8 μg/m3
Carbon Monoxide: 104 μg/m3
Nitrogen Dioxide: 4.7 μg/m3
Sulphur Dioxide: 0.5 μg/m3
Ozone: 124 μg/m3

Astronomical

Sunrise: 5:31 AM
Sun Transit: 12:55 AM
Sunset: 8:20 PM
Daylight: 14 hrs 49 mins
Moonrise: 9:16 AM
Moon Transit: 3:56 PM
Moonset: 10:25 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.0%

Best Times for Fishing or Hunting

Major Periods

5:30 AM - 8:00 AM
3:26 PM - 5:56 PM

Minor Periods

9:55 PM - 11:25 PM
8:46 AM - 10:16 AM

Action Rating: 3 out of 5

Small Craft Advisory issued July 17 at 2:36PM EDT until July 19 at 12:00AM EDT by NWS Upton NY

Effective: Fri July 17, 2026, 2:36 PM
Expires: Sat July 18, 2026, 6:00 AM

* WHAT...South winds 10 to 15 kt with gusts up to 25 kt. * WHERE...Long Island Sound east of Port Jefferson and New Haven, Peconic and Gardiners Bays, and South Shore Bays from Jones Inlet through Shinnecock Bay. * WHEN...From noon Saturday to midnight EDT Saturday night. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Friday, July 17, 2026

Weather Forecast

Sunny
90.1°F
62.8°F
76.3°F
51%
0 in
2%
0%
9.6 mph
8.9


Air Quality

AQI: 2 - Moderate
PM2.5: 16.48 μg/m3
PM10: 17.78 μg/m3
Carbon Monoxide: 130.42 μg/m3
Nitrogen Dioxide: 5.31 μg/m3
Sulphur Dioxide: 0.58 μg/m3
Ozone: 95.21 μg/m3

Astronomical

Sunrise: 5:31 AM
Sun Transit: 12:55 AM
Sunset: 8:20 PM
Daylight: 14 hrs 49 mins
Moonrise: 9:16 AM
Moon Transit: 3:56 PM
Moonset: 10:25 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.0%

Best Times for Fishing or Hunting

Major Periods

5:30 AM - 8:00 AM
3:26 PM - 5:56 PM

Minor Periods

9:55 PM - 11:25 PM
8:46 AM - 10:16 AM

Action Rating: 3 out of 5

Saturday, July 18, 2026

Weather Forecast

Sunny
80.2°F
65°F
70.5°F
83%
0.34 in
78%
0%
17 mph
4.8


Air Quality

AQI: 2 - Moderate
PM2.5: 21.58 μg/m3
PM10: 25.82 μg/m3
Carbon Monoxide: 140.04 μg/m3
Nitrogen Dioxide: 4.24 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 105.75 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 12:55 AM
Sunset: 8:19 PM
Daylight: 14 hrs 48 mins
Moonrise: 10:27 AM
Moon Transit: 4:42 PM
Moonset: 10:46 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.9%

Best Times for Fishing or Hunting

Major Periods

6:15 AM - 8:45 AM
4:12 PM - 6:42 PM

Minor Periods

10:16 PM - 11:46 PM
9:57 AM - 11:27 AM

Action Rating: 2 out of 5

Sunday, July 19, 2026

Weather Forecast

Sunny
79°F
65°F
72.5°F
66%
0.02 in
36%
0%
15.9 mph
7.9


Air Quality

AQI: 1 - Good
PM2.5: 4.71 μg/m3
PM10: 4.93 μg/m3
Carbon Monoxide: 140.79 μg/m3
Nitrogen Dioxide: 3.2 μg/m3
Sulphur Dioxide: 0.65 μg/m3
Ozone: 97.33 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 12:55 AM
Sunset: 8:19 PM
Daylight: 14 hrs 46 mins
Moonrise: 11:34 AM
Moon Transit: 5:26 PM
Moonset: 11:07 PM
Moon Phase: Waxing Crescent
Moon Illumination: 22.6%

Best Times for Fishing or Hunting

Major Periods

7:00 AM - 9:30 AM
4:56 PM - 7:26 PM

Minor Periods

12:00 AM - 12:00 AM
11:04 AM - 12:34 AM

Action Rating: 2 out of 5

Monday, July 20, 2026

Weather Forecast

Sunny
75.2°F
59.2°F
67.2°F
53%
0 in
3%
0%
8.7 mph
8.6


Air Quality

AQI: 1 - Good
PM2.5: 6.2 μg/m3
PM10: 7.11 μg/m3
Carbon Monoxide: 159.04 μg/m3
Nitrogen Dioxide: 3.23 μg/m3
Sulphur Dioxide: 0.39 μg/m3
Ozone: 84.5 μg/m3

Astronomical

Sunrise: 5:33 AM
Sun Transit: 12:55 AM
Sunset: 8:18 PM
Daylight: 14 hrs 45 mins
Moonrise: 12:41 AM
Moon Transit: 6:09 PM
Moonset: 12:07 AM
Moon Phase: Waxing Crescent
Moon Illumination: 32.7%

Best Times for Fishing or Hunting

Major Periods

7:43 AM - 10:13 AM
5:39 PM - 8:09 PM

Minor Periods

12:11 AM - 1:41 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Tuesday, July 21, 2026

Weather Forecast

Sunny
74.1°F
63.6°F
68.7°F
88%
0.93 in
83%
0%
13 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 11.79 μg/m3
PM10: 16.74 μg/m3
Carbon Monoxide: 160.78 μg/m3
Nitrogen Dioxide: 1.97 μg/m3
Sulphur Dioxide: 0.7 μg/m3
Ozone: 90.78 μg/m3

Astronomical

Sunrise: 5:34 AM
Sun Transit: 12:55 AM
Sunset: 8:17 PM
Daylight: 14 hrs 43 mins
Moonrise: 1:45 PM
Moon Transit: 6:53 PM
Moonset: 12:29 AM
Moon Phase: First Quarter
Moon Illumination: 43.7%

Best Times for Fishing or Hunting

Major Periods

8:27 AM - 10:57 AM
6:23 PM - 8:53 PM

Minor Periods

1:15 PM - 2:45 PM
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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