Water Temperature of the Mystic River in Old Mystic, CT

Current Water Temperature

54.5°F

Measurement Time: Wednesday, April 5, 2023, 10:42 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 / 0 meters

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

46°F
Clear
Conditions: Clear
Humidity: 42%
Feels Like: 39.8°F
Wind: WNW 14.1 mph
Wind Gusts: 21.3 mph
Pressure: 30.07 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Thu
H: 56°F
L: 38°F
Cloudy
Fri
H: 55°F
L: 34°F
Heavy rain
Sat
H: 61°F
L: 52°F
Partly Cloudy
Sun
H: 58°F
L: 48°F
Moderate rain
Mon
H: 58°F
L: 38°F

Air Quality

AQI: 1 - Good
PM2.5: 1.75 μg/m3
PM10: 1.85 μg/m3
Carbon Monoxide: 159.85 μg/m3
Nitrogen Dioxide: 3.55 μg/m3
Sulphur Dioxide: 1.65 μg/m3
Ozone: 74 μg/m3

Astronomical

Sunrise: 6:26 AM
Sun Transit: 11:31 AM
Sunset: 4:37 PM
Daylight: 10 hrs 11 mins
Moonrise: 5:07 PM
Moon Transit: 12:04 AM
Moonset: 7:58 AM
Moon Phase: Full
Moon Illumination: 97.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:36 PM - 5:06 PM

Minor Periods

4:37 PM - 6:07 PM
7:28 AM - 8:58 AM

Action Rating: 5 out of 5

Frost Advisory issued November 6 at 1:12PM EST until November 7 at 8:00AM EST by NWS Upton NY

Effective: Thu November 6, 2025, 1:12 PM
Expires: Fri November 7, 2025, 1:00 AM

* WHAT...Temperatures as low as 33 and mainly in the middle 30s will result in frost formation. * WHERE...Portions of southern Connecticut, northeast New Jersey, and southeast New York. * WHEN...From midnight tonight to 8 AM EST Friday. * IMPACTS...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.
Thursday, November 6, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 47.8°F
Average Humidity: 53%
Chance of Rain: 0%
Wind: 29.1 mph
UV Index: 0.5

Air Quality

AQI: 1 - Good
PM2.5: 2.55 μg/m3
PM10: 2.8 μg/m3
Carbon Monoxide: 155.41 μg/m3
Nitrogen Dioxide: 3.73 μg/m3
Sulphur Dioxide: 2.2 μg/m3
Ozone: 79.84 μg/m3

Astronomical

Sunrise: 6:26 AM
Sun Transit: 11:31 AM
Sunset: 4:37 PM
Daylight: 10 hrs 11 mins
Moonrise: 5:07 PM
Moon Transit: 12:04 AM
Moonset: 7:58 AM
Moon Phase: Full
Moon Illumination: 97.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:36 PM - 5:06 PM

Minor Periods

4:37 PM - 6:07 PM
7:28 AM - 8:58 AM

Action Rating: 5 out of 5

Friday, November 7, 2025

Weather Forecast

Conditions: Cloudy
Average Temperature: 45.5°F
Average Humidity: 67%
Chance of Rain: 0%
Wind: 23 mph
UV Index: 0.4

Air Quality

AQI: 1 - Good
PM2.5: 3.34 μg/m3
PM10: 4.19 μg/m3
Carbon Monoxide: 165.13 μg/m3
Nitrogen Dioxide: 3.6 μg/m3
Sulphur Dioxide: 2.03 μg/m3
Ozone: 78.2 μg/m3

Astronomical

Sunrise: 6:27 AM
Sun Transit: 11:31 AM
Sunset: 4:36 PM
Daylight: 10 hrs 9 mins
Moonrise: 6:02 PM
Moon Transit: 1:08 AM
Moonset: 9:18 AM
Moon Phase: Full
Moon Illumination: 93.4%

Best Times for Fishing or Hunting

Major Periods

12:38 AM - 3:08 AM
3:42 PM - 6:12 PM

Minor Periods

5:32 PM - 7:02 PM
8:48 AM - 10:18 AM

Action Rating: 3 out of 5

Saturday, November 8, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 57.2°F
Average Humidity: 79%
Chance of Rain: 88%
Wind: 21.3 mph
UV Index: 0.4

Air Quality

AQI: 1 - Good
PM2.5: 8.13 μg/m3
PM10: 9.4 μg/m3
Carbon Monoxide: 167.53 μg/m3
Nitrogen Dioxide: 9.46 μg/m3
Sulphur Dioxide: 4.25 μg/m3
Ozone: 85.28 μg/m3

Astronomical

Sunrise: 6:28 AM
Sun Transit: 11:31 AM
Sunset: 4:35 PM
Daylight: 10 hrs 6 mins
Moonrise: 7:07 PM
Moon Transit: 2:14 AM
Moonset: 10:29 AM
Moon Phase: Waning Gibbous
Moon Illumination: 86.7%

Best Times for Fishing or Hunting

Major Periods

1:44 AM - 4:14 AM
4:48 PM - 7:18 PM

Minor Periods

6:37 PM - 8:07 PM
9:59 AM - 11:29 AM

Action Rating: 3 out of 5

Sunday, November 9, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 53.3°F
Average Humidity: 78%
Chance of Rain: 0%
Wind: 15.2 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 9.19 μg/m3
PM10: 10.74 μg/m3
Carbon Monoxide: 177.53 μg/m3
Nitrogen Dioxide: 13.11 μg/m3
Sulphur Dioxide: 3.64 μg/m3
Ozone: 64.4 μg/m3

Astronomical

Sunrise: 6:30 AM
Sun Transit: 11:31 AM
Sunset: 4:34 PM
Daylight: 10 hrs 4 mins
Moonrise: 8:21 PM
Moon Transit: 3:19 AM
Moonset: 11:25 AM
Moon Phase: Waning Gibbous
Moon Illumination: 78.1%

Best Times for Fishing or Hunting

Major Periods

2:49 AM - 5:19 AM
5:51 PM - 8:21 PM

Minor Periods

7:51 PM - 9:21 PM
10:55 AM - 12:25 AM

Action Rating: 2 out of 5

Monday, November 10, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 48.3°F
Average Humidity: 83%
Chance of Rain: 85%
Wind: 17.4 mph
UV Index: 0.3

Air Quality

AQI: 1 - Good
PM2.5: 8.39 μg/m3
PM10: 8.92 μg/m3
Carbon Monoxide: 211.08 μg/m3
Nitrogen Dioxide: 13.29 μg/m3
Sulphur Dioxide: 4.53 μg/m3
Ozone: 62.77 μg/m3

Astronomical

Sunrise: 6:31 AM
Sun Transit: 11:31 AM
Sunset: 4:33 PM
Daylight: 10 hrs 2 mins
Moonrise: 9:36 PM
Moon Transit: 4:20 AM
Moonset: 12:09 AM
Moon Phase: Waning Gibbous
Moon Illumination: 68.0%

Best Times for Fishing or Hunting

Major Periods

3:50 AM - 6:20 AM
6:48 PM - 9:18 PM

Minor Periods

9:06 PM - 10:36 PM
11:39 AM - 1:09 PM

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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