Water Temperature of the Connecticut River in Old Lyme, CT

Current Water Temperature

70.3°F

Measurement Time: Thursday, June 18, 2026, 10:45 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

81.1°F
Sunny
Sunny
85.9°F
87.3°F
70%
SSW 20.6 mph
29.1 mph
82°F
73.3°F
0 in
25%
8 mi
999 mbar
7.1

Five Day Weather Forecast

Sunny
Thu
H: 86°F
L: 61°F
Sunny
Fri
H: 77°F
L: 64°F
Sunny
Sat
H: 75°F
L: 61°F
Sunny
Sun
H: 75°F
L: 57°F
Heavy rain
Mon
H: 68°F
L: 59°F

Air Quality

AQI: 1 - Good
PM2.5: 8.1 μg/m3
PM10: 11.9 μg/m3
Carbon Monoxide: 123 μg/m3
Nitrogen Dioxide: 1.7 μg/m3
Sulphur Dioxide: 0.3 μg/m3
Ozone: 112 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:50 AM
Sunset: 8:26 PM
Daylight: 15 hrs 10 mins
Moonrise: 9:10 AM
Moon Transit: 4:29 PM
Moonset: 12:05 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.4%

Best Times for Fishing or Hunting

Major Periods

5:59 AM - 8:29 AM
3:59 PM - 6:29 PM

Minor Periods

8:40 AM - 10:10 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Small Craft Advisory issued June 18 at 2:39AM EDT until June 18 at 11:00PM EDT by NWS Upton NY

Effective: Thu June 18, 2026, 2:39 AM
Expires: Thu June 18, 2026, 3:45 PM

* WHAT...South winds 10 to 20 kt with gusts up to 35 kt and seas 1 to 3 feet expected. * WHERE...Long Island Sound, New York Harbor, Peconic and Gardiners Bays, and South Shore Bays from Jones Inlet through Shinnecock Bay. * WHEN...From 6 AM this morning to 11 PM EDT this evening. * IMPACTS...Conditions will be hazardous to small craft.

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


Gale Warning issued June 18 at 10:37AM EDT until June 18 at 11:00PM EDT by NWS Upton NY

Effective: Thu June 18, 2026, 10:37 AM
Expires: Thu June 18, 2026, 11:00 PM

* WHAT...Southwest winds 20 to 30 kt with gusts up to 35 kt. Seas 2 to 4 feet on Long Island Sound and Lower NY Harbor. * WHERE...Long Island Sound, New York Harbor, Peconic and Gardiners Bays, and South Shore Bays from Jones Inlet through Shinnecock Bay. * WHEN...Until 11 PM EDT this evening. * IMPACTS...Strong winds will cause hazardous seas which could capsize or damage vessels and reduce visibility.

Mariners should alter plans to avoid these hazardous conditions. Remain in port, seek safe harbor, alter course, and/or secure the vessel for hazardous conditions.
Thursday, June 18, 2026

Weather Forecast

Sunny
85.5°F
61.2°F
71.8°F
75%
0 in
17%
0%
21.9 mph
7.1


Air Quality

AQI: 1 - Good
PM2.5: 10.92 μg/m3
PM10: 15.25 μg/m3
Carbon Monoxide: 124.58 μg/m3
Nitrogen Dioxide: 3 μg/m3
Sulphur Dioxide: 0.48 μg/m3
Ozone: 108.54 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:50 AM
Sunset: 8:26 PM
Daylight: 15 hrs 10 mins
Moonrise: 9:10 AM
Moon Transit: 4:29 PM
Moonset: 12:05 AM
Moon Phase: Waxing Crescent
Moon Illumination: 10.4%

Best Times for Fishing or Hunting

Major Periods

5:59 AM - 8:29 AM
3:59 PM - 6:29 PM

Minor Periods

8:40 AM - 10:10 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Friday, June 19, 2026

Weather Forecast

Sunny
77.4°F
64.2°F
70.5°F
55%
0 in
4%
0%
16.1 mph
9.5


Air Quality

AQI: 1 - Good
PM2.5: 4.61 μg/m3
PM10: 5.31 μg/m3
Carbon Monoxide: 121.75 μg/m3
Nitrogen Dioxide: 4.61 μg/m3
Sulphur Dioxide: 0.52 μg/m3
Ozone: 94.33 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:50 AM
Sunset: 8:26 PM
Daylight: 15 hrs 10 mins
Moonrise: 10:25 AM
Moon Transit: 5:19 PM
Moonset: 12:36 AM
Moon Phase: Waxing Crescent
Moon Illumination: 18.3%

Best Times for Fishing or Hunting

Major Periods

6:51 AM - 9:21 AM
4:49 PM - 7:19 PM

Minor Periods

9:55 AM - 11:25 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Saturday, June 20, 2026

Weather Forecast

Sunny
74.8°F
61°F
67.9°F
59%
0 in
4%
0%
16.6 mph
8.5


Air Quality

AQI: 1 - Good
PM2.5: 2.5 μg/m3
PM10: 2.62 μg/m3
Carbon Monoxide: 109.67 μg/m3
Nitrogen Dioxide: 2.38 μg/m3
Sulphur Dioxide: 0.41 μg/m3
Ozone: 72.33 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:51 AM
Sunset: 8:26 PM
Daylight: 15 hrs 10 mins
Moonrise: 11:35 AM
Moon Transit: 6:05 PM
Moonset: 12:01 AM
Moon Phase: Waxing Crescent
Moon Illumination: 27.8%

Best Times for Fishing or Hunting

Major Periods

7:38 AM - 10:08 AM
5:35 PM - 8:05 PM

Minor Periods

11:05 AM - 12:35 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Sunday, June 21, 2026

Weather Forecast

Sunny
75.4°F
57.3°F
66.5°F
64%
0 in
5%
0%
12.5 mph
6.9


Air Quality

AQI: 1 - Good
PM2.5: 5.72 μg/m3
PM10: 7.35 μg/m3
Carbon Monoxide: 109.75 μg/m3
Nitrogen Dioxide: 3.76 μg/m3
Sulphur Dioxide: 0.59 μg/m3
Ozone: 79.58 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:51 AM
Sunset: 8:26 PM
Daylight: 15 hrs 10 mins
Moonrise: 12:43 AM
Moon Transit: 6:48 PM
Moonset: 12:23 AM
Moon Phase: First Quarter
Moon Illumination: 38.5%

Best Times for Fishing or Hunting

Major Periods

8:22 AM - 10:52 AM
6:18 PM - 8:48 PM

Minor Periods

12:13 AM - 1:43 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Monday, June 22, 2026

Weather Forecast

Heavy rain
67.6°F
59°F
62.8°F
86%
1.54 in
84%
0%
11.4 mph
0.1


Air Quality

AQI: 1 - Good
PM2.5: 9.32 μg/m3
PM10: 13.71 μg/m3
Carbon Monoxide: 137.56 μg/m3
Nitrogen Dioxide: 2.19 μg/m3
Sulphur Dioxide: 0.44 μg/m3
Ozone: 97.22 μg/m3

Astronomical

Sunrise: 5:16 AM
Sun Transit: 12:51 AM
Sunset: 8:27 PM
Daylight: 15 hrs 10 mins
Moonrise: 1:48 PM
Moon Transit: 7:30 PM
Moonset: 12:44 AM
Moon Phase: First Quarter
Moon Illumination: 49.7%

Best Times for Fishing or Hunting

Major Periods

9:05 AM - 11:35 AM
7:00 PM - 9:30 PM

Minor Periods

1:18 PM - 2:48 PM
12:14 AM - 1:44 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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