Water Temperature of the Mystic River in Old Mystic, CT

Current Water Temperature

54.5°F

Measurement Time: Wednesday, April 5, 2023, 10:36 AM EDT

Temperature Locations

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Mystic River

Station Name: MYSTIC RIVER US RTE I95 BRIDGE NEAR OLD MYSTIC, CT
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 0 feet

Nearest Address:
3 Whitehall Lndg
Old Mystic, CT 06355
New London County

GPS Coordinates: 41.37782778, -71.9631806

Nearby Water Temperatures

Mystic River, Mystic, CT (1.1 mi)
Mystic Harbor, Mystic, CT (2.2 mi)
Mystic River, Noank, CT (3.6 mi)
Thames River, Groton, CT (6.5 mi)
Pawcatuck River, Westerly, RI (6.8 mi)
Thames River, New London, CT (6.9 mi)
Yantic River, Norwich, CT (14.9 mi)
East Branch Eightmile River, Lyme, CT (19.6 mi)
Eightmile River, East Haddam, CT (19.6 mi)
Connecticut River, Old Lyme, CT (20.4 mi)
Fort Pond Bay, Montauk, NY (22.8 mi)
Orient Harbor, Orient, NY (24.4 mi)
Natchaug River, Chaplin, CT (31.2 mi)
Hemlock Brook, Foster, RI (31.6 mi)
Wilbur Hollow Brook, Clayville, RI (31.6 mi)

Weather for Old Mystic, Connecticut

Current Weather

48°F
Partly cloudy
Partly cloudy
44.4°F
45.2°F
51%
W 7.8 mph
9.3 mph
41.5°F
32.5°F
0 in
75%
9 mi
1021 mbar
1.7

Five Day Weather Forecast

Patchy rain nearby
Mon
H: 47°F
L: 32°F
Sunny
Tue
H: 49°F
L: 29°F
Moderate rain
Wed
H: 46°F
L: 39°F
Sunny
Thu
H: 60°F
L: 40°F
Sunny
Fri
H: 58°F
L: 42°F

Air Quality

AQI: 1 - Good
PM2.5: 4.05 μg/m3
PM10: 4.65 μg/m3
Carbon Monoxide: 176.85 μg/m3
Nitrogen Dioxide: 2.55 μg/m3
Sulphur Dioxide: 1.45 μg/m3
Ozone: 99 μg/m3

Astronomical

Sunrise: 6:01 AM
Sun Transit: 12:46 AM
Sunset: 7:33 PM
Daylight: 13 hrs 33 mins
Moonrise: 7:45 AM
Moon Transit: 3:53 PM
Moonset: 12:07 PM
Moon Phase: Waxing Crescent
Moon Illumination: 10.8%

Best Times for Fishing or Hunting

Major Periods

5:22 AM - 7:52 AM
3:23 PM - 5:53 PM

Minor Periods

12:00 AM - 12:00 AM
7:15 AM - 8:45 AM

Action Rating: 2 out of 5

Frost Advisory issued April 20 at 2:14AM EDT until April 20 at 8:00AM EDT by NWS Upton NY

Effective: Mon April 20, 2026, 2:14 AM
Expires: Mon April 20, 2026, 10:15 AM

* WHAT...For the Frost Advisory, temperatures as low as 33 will result in frost formation. For the Freeze Warning, sub-freezing temperatures as low as 27 expected. * WHERE...Portions of southern Connecticut, northeast New Jersey, and southeast New York. * WHEN...For the Frost Advisory, until 8 AM EDT this morning. For the Freeze Warning, from midnight tonight to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.


Freeze Warning issued April 20 at 2:14AM EDT until April 21 at 9:00AM EDT by NWS Upton NY

Effective: Mon April 20, 2026, 2:14 AM
Expires: Mon April 20, 2026, 10:15 AM

* WHAT...For the Frost Advisory, temperatures as low as 33 will result in frost formation. For the Freeze Warning, sub-freezing temperatures as low as 27 expected. * WHERE...Portions of southern Connecticut, northeast New Jersey, and southeast New York. * WHEN...For the Frost Advisory, until 8 AM EDT this morning. For the Freeze Warning, from midnight tonight to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.


Freeze Warning issued April 20 at 2:14AM EDT until April 21 at 9:00AM EDT by NWS Upton NY

Effective: Mon April 20, 2026, 2:14 AM
Expires: Mon April 20, 2026, 10:15 AM

* WHAT...Sub-freezing temperatures as low as 24 expected. * WHERE...In Connecticut, Northern Fairfield, Northern Middlesex, Northern New Haven, and Northern New London Counties. In New Jersey, Eastern Essex, Eastern Union, Western Essex, and Western Union Counties. In New York, Orange and Putnam Counties. * WHEN...From midnight tonight to 9 AM EDT Tuesday. * IMPACTS...Frost and freeze conditions could kill crops and other sensitive vegetation.

Take steps now to protect tender plants from the cold.
Monday, April 20, 2026

Weather Forecast

Patchy rain nearby
47.3°F
32.4°F
40.9°F
59%
0.01 in
77%
0%
10.1 mph
3.3


Air Quality

AQI: 1 - Good
PM2.5: 4.98 μg/m3
PM10: 5.37 μg/m3
Carbon Monoxide: 192.93 μg/m3
Nitrogen Dioxide: 6.02 μg/m3
Sulphur Dioxide: 2.02 μg/m3
Ozone: 82.4 μg/m3

Astronomical

Sunrise: 6:01 AM
Sun Transit: 12:46 AM
Sunset: 7:33 PM
Daylight: 13 hrs 33 mins
Moonrise: 7:45 AM
Moon Transit: 3:53 PM
Moonset: 12:07 PM
Moon Phase: Waxing Crescent
Moon Illumination: 10.8%

Best Times for Fishing or Hunting

Major Periods

5:22 AM - 7:52 AM
3:23 PM - 5:53 PM

Minor Periods

12:00 AM - 12:00 AM
7:15 AM - 8:45 AM

Action Rating: 2 out of 5

Tuesday, April 21, 2026

Weather Forecast

Sunny
48.9°F
29.2°F
39.6°F
51%
0 in
0%
0%
10.7 mph
5.9


Air Quality

AQI: 1 - Good
PM2.5: 5.3 μg/m3
PM10: 5.88 μg/m3
Carbon Monoxide: 183.93 μg/m3
Nitrogen Dioxide: 4.97 μg/m3
Sulphur Dioxide: 2.11 μg/m3
Ozone: 89.2 μg/m3

Astronomical

Sunrise: 5:59 AM
Sun Transit: 12:46 AM
Sunset: 7:35 PM
Daylight: 13 hrs 36 mins
Moonrise: 8:46 AM
Moon Transit: 4:58 PM
Moonset: 12:07 AM
Moon Phase: Waxing Crescent
Moon Illumination: 18.8%

Best Times for Fishing or Hunting

Major Periods

6:27 AM - 8:57 AM
4:28 PM - 6:58 PM

Minor Periods

8:16 AM - 9:46 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Wednesday, April 22, 2026

Weather Forecast

Moderate rain
45.5°F
38.9°F
42.6°F
86%
0.2 in
89%
0%
11.6 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 8.97 μg/m3
PM10: 12.25 μg/m3
Carbon Monoxide: 170.89 μg/m3
Nitrogen Dioxide: 3.82 μg/m3
Sulphur Dioxide: 1.87 μg/m3
Ozone: 102.28 μg/m3

Astronomical

Sunrise: 5:58 AM
Sun Transit: 12:46 AM
Sunset: 7:36 PM
Daylight: 13 hrs 38 mins
Moonrise: 9:56 AM
Moon Transit: 6:01 PM
Moonset: 1:09 AM
Moon Phase: Waxing Crescent
Moon Illumination: 28.4%

Best Times for Fishing or Hunting

Major Periods

7:31 AM - 10:01 AM
5:31 PM - 8:01 PM

Minor Periods

9:26 AM - 10:56 AM
12:39 AM - 2:09 AM

Action Rating: 3 out of 5

Thursday, April 23, 2026

Weather Forecast

Sunny
60.3°F
39.7°F
49.7°F
67%
0 in
0%
0%
13 mph
5.6


Air Quality

AQI: 1 - Good
PM2.5: 12.09 μg/m3
PM10: 15.52 μg/m3
Carbon Monoxide: 173.61 μg/m3
Nitrogen Dioxide: 5.97 μg/m3
Sulphur Dioxide: 1.89 μg/m3
Ozone: 89.04 μg/m3

Astronomical

Sunrise: 5:56 AM
Sun Transit: 12:46 AM
Sunset: 7:37 PM
Daylight: 13 hrs 41 mins
Moonrise: 11:10 AM
Moon Transit: 7:00 PM
Moonset: 1:58 AM
Moon Phase: First Quarter
Moon Illumination: 39.1%

Best Times for Fishing or Hunting

Major Periods

8:31 AM - 11:01 AM
6:30 PM - 9:00 PM

Minor Periods

10:40 AM - 12:10 AM
1:28 AM - 2:58 AM

Action Rating: 2 out of 5

Friday, April 24, 2026

Weather Forecast

Sunny
57.6°F
41.6°F
48.5°F
56%
0 in
0%
0%
8.3 mph
0.8


Air Quality

AQI: 1 - Good
PM2.5: 7.83 μg/m3
PM10: 8.33 μg/m3
Carbon Monoxide: 214.08 μg/m3
Nitrogen Dioxide: 9.85 μg/m3
Sulphur Dioxide: 2.5 μg/m3
Ozone: 72 μg/m3

Astronomical

Sunrise: 5:55 AM
Sun Transit: 12:45 AM
Sunset: 7:38 PM
Daylight: 13 hrs 43 mins
Moonrise: 12:26 AM
Moon Transit: 7:52 PM
Moonset: 2:36 AM
Moon Phase: First Quarter
Moon Illumination: 50.4%

Best Times for Fishing or Hunting

Major Periods

9:25 AM - 11:55 AM
7:22 PM - 9:52 PM

Minor Periods

11:56 AM - 1:26 PM
2:06 AM - 3:36 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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