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

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

18.3°F
Clear with periodic clouds
Conditions: Clear with periodic clouds
Humidity: 49%
Heat Index: 18.3°F
Feels Like: 5°F
Wind: NNW 7.5 mph
Wind Gusts: 19 mph
Wind Chill: 5°F
Air Pressure: 1021.99 millibars
Dew Point: 5°F
Chance of Precipitation: 0%
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 10 mi
UV Index: 0

Five Day Weather Forecast

Moderate snow
Fri
H: 25°F
L: 14°F
Moderate or heavy snow showers
Sat
H: 35°F
L: 21°F
Sunny
Sun
H: 41°F
L: 24°F
Moderate rain
Mon
H: 46°F
L: 35°F
Partly Cloudy
Tue
H: 30°F
L: 25°F

Air Quality

PM2.5: 2.05 μg/m3
PM10: 2.25 μg/m3
Carbon Monoxide: 162.85 μg/m3
Nitrogen Dioxide: 3.35 μg/m3
Sulphur Dioxide: 1.85 μg/m3
Ozone: 77 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 11:48 AM
Sunset: 4:25 PM
Daylight: 9 hrs 12 mins
Moonrise: 11:02 AM
Moon Transit: 12:00 AM
Moonset: 11:15 PM
Moon Phase: First Quarter
Moon Illumination: 40.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

12:00 AM - 12:00 AM
10:32 AM - 12:02 AM

Action Rating: 2 out of 5

Winter Weather Advisory issued December 25 at 1:19PM EST until December 27 at 1:00PM EST by NWS Upton NY

Effective: Thu December 25, 2025, 1:19 PM
Expires: Fri December 26, 2025, 4:00 AM

* WHAT...Snow expected. Total snow accumulations between 3 and 5 inches. * WHERE...Northern Middlesex and Southern Middlesex Counties. * WHEN...From 7 PM Friday to 1 PM EST Saturday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Friday evening commute.

Slow down and use caution while traveling. Check local Department of Transportation information services for the latest road conditions.
Friday, December 26, 2025

Weather Forecast

Conditions: Moderate snow
Average Temperature: 21°F
Average Humidity: 41%
Chance of Rain: 66%
Wind: 15.4 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 2.27 μg/m3
PM10: 2.39 μg/m3
Carbon Monoxide: 168.77 μg/m3
Nitrogen Dioxide: 5.05 μg/m3
Sulphur Dioxide: 1.92 μg/m3
Ozone: 75.84 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 11:48 AM
Sunset: 4:25 PM
Daylight: 9 hrs 12 mins
Moonrise: 11:02 AM
Moon Transit: 12:00 AM
Moonset: 11:15 PM
Moon Phase: First Quarter
Moon Illumination: 40.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

12:00 AM - 12:00 AM
10:32 AM - 12:02 AM

Action Rating: 2 out of 5

Saturday, December 27, 2025

Weather Forecast

Conditions: Moderate or heavy snow showers
Average Temperature: 27.3°F
Average Humidity: 75%
Chance of Rain: 86%
Wind: 14.1 mph
UV Index: 0.3

Air Quality

AQI: 1 - Good
PM2.5: 4.51 μg/m3
PM10: 5.13 μg/m3
Carbon Monoxide: 192.97 μg/m3
Nitrogen Dioxide: 9.55 μg/m3
Sulphur Dioxide: 2.63 μg/m3
Ozone: 66.4 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 11:49 AM
Sunset: 4:26 PM
Daylight: 9 hrs 13 mins
Moonrise: 11:24 AM
Moon Transit: 4:23 AM
Moonset: 12:15 AM
Moon Phase: First Quarter
Moon Illumination: 51.8%

Best Times for Fishing or Hunting

Major Periods

3:53 AM - 6:23 AM
3:53 AM - 6:23 AM

Minor Periods

10:54 AM - 12:24 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Sunday, December 28, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 31.1°F
Average Humidity: 71%
Chance of Rain: 0%
Wind: 12.5 mph
UV Index: 0.3

Air Quality

AQI: 1 - Good
PM2.5: 5.84 μg/m3
PM10: 6.9 μg/m3
Carbon Monoxide: 216.12 μg/m3
Nitrogen Dioxide: 9.3 μg/m3
Sulphur Dioxide: 2.83 μg/m3
Ozone: 68.2 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 11:49 AM
Sunset: 4:26 PM
Daylight: 9 hrs 13 mins
Moonrise: 11:47 AM
Moon Transit: 6:35 PM
Moonset: 12:26 AM
Moon Phase: First Quarter
Moon Illumination: 63.0%

Best Times for Fishing or Hunting

Major Periods

8:10 AM - 10:40 AM
6:05 PM - 8:35 PM

Minor Periods

11:17 AM - 12:47 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Monday, December 29, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 42°F
Average Humidity: 94%
Chance of Rain: 80%
Wind: 28 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 8.1 μg/m3
PM10: 11.18 μg/m3
Carbon Monoxide: 157.93 μg/m3
Nitrogen Dioxide: 2.57 μg/m3
Sulphur Dioxide: 1.63 μg/m3
Ozone: 76.92 μg/m3

Astronomical

Sunrise: 7:13 AM
Sun Transit: 11:50 AM
Sunset: 4:27 PM
Daylight: 9 hrs 14 mins
Moonrise: 12:13 AM
Moon Transit: 7:27 PM
Moonset: 1:39 AM
Moon Phase: First Quarter
Moon Illumination: 73.5%

Best Times for Fishing or Hunting

Major Periods

9:00 AM - 11:30 AM
6:57 PM - 9:27 PM

Minor Periods

11:43 AM - 1:13 PM
1:09 AM - 2:39 AM

Action Rating: 2 out of 5

Tuesday, December 30, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 27.8°F
Average Humidity: 64%
Chance of Rain: 0%
Wind: 28.6 mph
UV Index: 0

Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:14 AM
Sun Transit: 11:50 AM
Sunset: 4:28 PM
Daylight: 9 hrs 14 mins
Moonrise: 12:46 AM
Moon Transit: 8:24 PM
Moonset: 2:57 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.8%

Best Times for Fishing or Hunting

Major Periods

9:55 AM - 12:25 AM
7:54 PM - 10:24 PM

Minor Periods

12:16 AM - 1:46 PM
2:27 AM - 3:57 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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