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

37.9°F
Overcast
Overcast
31.5°F
40.5°F
73%
ESE 8.9 mph
14.6 mph
34.2°F
35.9°F
0 in
100%
9 mi
1031 mbar
0

Five Day Weather Forecast

Sunny
Sun
H: 48°F
L: 32°F
Heavy rain
Mon
H: 54°F
L: 38°F
Heavy rain
Tue
H: 41°F
L: 31°F
Overcast
Wed
H: 34°F
L: 25°F
Partly Cloudy
Thu
H: 38°F
L: 29°F

Air Quality

AQI: 1 - Good
PM2.5: 10.35 μg/m3
PM10: 14.95 μg/m3
Carbon Monoxide: 175.85 μg/m3
Nitrogen Dioxide: 3.95 μg/m3
Sulphur Dioxide: 1.55 μg/m3
Ozone: 95 μg/m3

Astronomical

Sunrise: 7:00 AM
Sun Transit: 12:56 AM
Sunset: 6:55 PM
Daylight: 11 hrs 55 mins
Moonrise: 5:24 AM
Moon Transit: 10:16 AM
Moonset: 3:16 PM
Moon Phase: Waning Crescent
Moon Illumination: 3.6%

Best Times for Fishing or Hunting

Major Periods

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

Minor Periods

2:46 PM - 4:16 PM
4:54 AM - 6:24 AM

Action Rating: 2 out of 5

Wind Advisory issued March 15 at 2:26PM EDT until March 17 at 4:00AM EDT by NWS Upton NY

Effective: Sun March 15, 2026, 2:26 PM
Expires: Mon March 16, 2026, 6:00 AM

* WHAT...South winds 15 to 25 mph with gusts up to 50 mph expected. Isolated gusts up to 55 mph. * WHERE...Portions of southern Connecticut, northeast New Jersey, and southeast New York. * WHEN...From 2 PM Monday to 4 AM EDT Tuesday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects.


Flood Watch issued March 15 at 2:22PM EDT until March 17 at 8:00AM EDT by NWS Upton NY

Effective: Sun March 15, 2026, 2:22 PM
Expires: Mon March 16, 2026, 6:00 AM

* WHAT...Flooding caused by excessive rainfall is possible. * WHERE...All of southern Connecticut, including the following areas, Northern Fairfield, Northern Middlesex, Northern New Haven, Northern New London, Southern Fairfield, Southern Middlesex, Southern New Haven and Southern New London. * WHEN...From late tonight through Tuesday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.


High Wind Watch issued March 15 at 12:58AM EDT until March 17 at 6:00AM EDT by NWS Boston/Norton MA

Effective: Sun March 15, 2026, 12:58 AM
Expires: Sun March 15, 2026, 4:00 PM

* WHAT...South winds 20 to 30 mph with gusts up to 60 mph possible. * WHERE...Portions of eastern, northeastern, and southeastern Massachusetts and northern and southern Rhode Island. * WHEN...From Monday afternoon through late Monday night. * IMPACTS...Damaging winds could blow down trees and power lines. Power outages are possible. Travel could be difficult, especially for high profile vehicles.

Monitor the latest forecasts and warnings for updates.


Flood Watch issued March 15 at 12:14PM EDT until March 17 at 8:00AM EDT by NWS Boston/Norton MA

Effective: Sun March 15, 2026, 12:14 PM
Expires: Mon March 16, 2026, 5:00 AM

Heavy rain may fall on a deep primed snowpack leading to the melt increasing. Flows in rivers may increase quickly and reach critical levels. * WHAT...Flooding caused by rain and snowmelt is possible. * WHERE...Portions of northern Connecticut, including the following areas, Hartford CT, Tolland CT and Windham CT, Massachusetts, including the following areas, Barnstable MA, Central Middlesex MA, Eastern Essex MA, Eastern Franklin MA, Eastern Hampden MA, Eastern Hampshire MA, Eastern Norfolk MA, Eastern Plymouth MA, Northern Bristol MA, Northern Middlesex MA, Northern Worcester MA, Southeast Middlesex MA, Southern Bristol MA, Southern Plymouth MA, Southern Worcester MA, Suffolk MA, Western Essex MA, Western Franklin MA, Western Hampden MA, Western Hampshire MA, Western Norfolk MA and Western Plymouth MA, and Rhode Island, including the following areas, Bristol RI, Eastern Kent RI, Newport RI, Northwest Providence RI, Southeast Providence RI, Washington RI and Western Kent RI. * WHEN...From late tonight through Tuesday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. Area creeks and streams are running high and could flood with more heavy rain. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.


High Wind Watch issued March 15 at 12:13PM EDT until March 17 at 6:00AM EDT by NWS Boston/Norton MA

Effective: Sun March 15, 2026, 12:13 PM
Expires: Mon March 16, 2026, 4:00 AM

* WHAT...South winds 20 to 30 mph with gusts up to 60 mph possible. * WHERE...Portions of eastern, northeastern, and southeastern Massachusetts and northern and southern Rhode Island. * WHEN...From Monday afternoon through late Monday night. * IMPACTS...Damaging winds could blow down trees and power lines. Power outages are possible. Travel could be difficult, especially for high profile vehicles.

Monitor the latest forecasts and warnings for updates.


Sunday, March 15, 2026

Weather Forecast

Sunny
47.5°F
31.8°F
38°F
65%
0 in
0%
0%
12.8 mph
0.7


Air Quality

AQI: 1 - Good
PM2.5: 4.03 μg/m3
PM10: 4.66 μg/m3
Carbon Monoxide: 191.93 μg/m3
Nitrogen Dioxide: 5.2 μg/m3
Sulphur Dioxide: 2.1 μg/m3
Ozone: 89.32 μg/m3

Astronomical

Sunrise: 7:00 AM
Sun Transit: 12:56 AM
Sunset: 6:55 PM
Daylight: 11 hrs 55 mins
Moonrise: 5:24 AM
Moon Transit: 10:16 AM
Moonset: 3:16 PM
Moon Phase: Waning Crescent
Moon Illumination: 3.6%

Best Times for Fishing or Hunting

Major Periods

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

Minor Periods

2:46 PM - 4:16 PM
4:54 AM - 6:24 AM

Action Rating: 2 out of 5

Monday, March 16, 2026

Weather Forecast

Heavy rain
54.1°F
37.9°F
49°F
95%
2.5 in
89%
0%
26.4 mph
0.2


Air Quality

AQI: 1 - Good
PM2.5: 7.74 μg/m3
PM10: 11.19 μg/m3
Carbon Monoxide: 150.45 μg/m3
Nitrogen Dioxide: 3.8 μg/m3
Sulphur Dioxide: 1.29 μg/m3
Ozone: 81.68 μg/m3

Astronomical

Sunrise: 6:58 AM
Sun Transit: 12:56 AM
Sunset: 6:56 PM
Daylight: 11 hrs 58 mins
Moonrise: 5:50 AM
Moon Transit: 11:03 AM
Moonset: 4:27 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.6%

Best Times for Fishing or Hunting

Major Periods

12:39 AM - 3:09 AM
10:33 AM - 1:03 PM

Minor Periods

3:57 PM - 5:27 PM
5:20 AM - 6:50 AM

Action Rating: 3 out of 5

Tuesday, March 17, 2026

Weather Forecast

Heavy rain
41.1°F
31.4°F
40.7°F
64%
1.41 in
89%
0%
25.7 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 2.73 μg/m3
PM10: 3.11 μg/m3
Carbon Monoxide: 156.65 μg/m3
Nitrogen Dioxide: 2.99 μg/m3
Sulphur Dioxide: 1.65 μg/m3
Ozone: 85.12 μg/m3

Astronomical

Sunrise: 6:56 AM
Sun Transit: 12:56 AM
Sunset: 6:57 PM
Daylight: 12 hrs 1 mins
Moonrise: 6:15 AM
Moon Transit: 11:50 AM
Moonset: 5:37 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

1:25 AM - 3:55 AM
11:20 AM - 1:50 PM

Minor Periods

5:07 PM - 6:37 PM
5:45 AM - 7:15 AM

Action Rating: 5 out of 5

Wednesday, March 18, 2026

Weather Forecast

Overcast
34.3°F
25.3°F
29.3°F
39%
0 in
0%
0%
10.5 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 3.86 μg/m3
PM10: 4.05 μg/m3
Carbon Monoxide: 181.18 μg/m3
Nitrogen Dioxide: 4.85 μg/m3
Sulphur Dioxide: 2.18 μg/m3
Ozone: 84.2 μg/m3

Astronomical

Sunrise: 6:55 AM
Sun Transit: 12:55 AM
Sunset: 6:58 PM
Daylight: 12 hrs 3 mins
Moonrise: 6:37 AM
Moon Transit: 12:36 AM
Moonset: 6:48 PM
Moon Phase: New
Moon Illumination: 2.2%

Best Times for Fishing or Hunting

Major Periods

2:12 AM - 4:42 AM
12:06 AM - 2:36 PM

Minor Periods

6:18 PM - 7:48 PM
6:07 AM - 7:37 AM

Action Rating: 3 out of 5

Thursday, March 19, 2026

Weather Forecast

Partly Cloudy
38.1°F
28.5°F
32.7°F
54%
0 in
0%
0%
7.8 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 5.77 μg/m3
PM10: 7.06 μg/m3
Carbon Monoxide: 205.15 μg/m3
Nitrogen Dioxide: 6.68 μg/m3
Sulphur Dioxide: 1.99 μg/m3
Ozone: 86.23 μg/m3

Astronomical

Sunrise: 6:53 AM
Sun Transit: 12:00 AM
Sunset: 6:59 PM
Daylight: 12 hrs 6 mins
Moonrise: 6:59 AM
Moon Transit: 1:31 AM
Moonset: 8:01 PM
Moon Phase: New
Moon Illumination: 0.3%

Best Times for Fishing or Hunting

Major Periods

1:01 AM - 3:31 AM
1:01 AM - 3:31 AM

Minor Periods

7:31 PM - 9:01 PM
6:29 AM - 7:59 AM

Action Rating: 4 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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