Water Temperature of the Mystic River in Mystic, CT

Current Water Temperature

49.3°F

Measurement Time: Monday, April 10, 2023, 5:18 AM EDT

Temperature Locations

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Local Points of Interest

Mystic Seaport

Mystic River

Station Name: MYSTIC RIVER AT MYSTIC SEAPORT NEAR MYSTIC, CT
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 0 feet

Nearest Address:
93 Pearl St
Mystic, CT 06355
New London County

GPS Coordinates: 41.3614722, -71.96727778

Nearby Water Temperatures

Mystic Harbor, Mystic, CT (1 mi)
Mystic River, Old Mystic, CT (1.1 mi)
Mystic River, Noank, CT (2.5 mi)
Thames River, Groton, CT (6 mi)
Thames River, New London, CT (6.7 mi)
Pawcatuck River, Westerly, RI (7.1 mi)
Yantic River, Norwich, CT (15.8 mi)
East Branch Eightmile River, Lyme, CT (19.6 mi)
Eightmile River, East Haddam, CT (19.7 mi)
Connecticut River, Old Lyme, CT (19.9 mi)
Fort Pond Bay, Montauk, NY (21.6 mi)
Orient Harbor, Orient, NY (23.5 mi)
Natchaug River, Chaplin, CT (32.2 mi)
Wilbur Hollow Brook, Clayville, RI (32.7 mi)
Hemlock Brook, Foster, RI (32.7 mi)

Weather for Mystic, Connecticut

Current Weather

73.4°F
Overcast
Overcast
77.2°F
81.1°F
88%
S 14.3 mph
20.7 mph
77.2°F
70.9°F
0 in
100%
10 mi
1006 mbar
0.7

Five Day Weather Forecast

Sunny
Tue
H: 83°F
L: 68°F
Light drizzle
Wed
H: 71°F
L: 65°F
Patchy rain nearby
Thu
H: 65°F
L: 64°F
Patchy rain nearby
Fri
H: 75°F
L: 65°F
Sunny
Sat
H: 78°F
L: 64°F

Air Quality

AQI: 1 - Good
PM2.5: 12.2 μg/m3
PM10: 17.5 μg/m3
Carbon Monoxide: 108 μg/m3
Nitrogen Dioxide: 1.8 μg/m3
Sulphur Dioxide: 0.4 μg/m3
Ozone: 111 μg/m3

Astronomical

Sunrise: 5:39 AM
Sun Transit: 12:54 AM
Sunset: 8:09 PM
Daylight: 14 hrs 30 mins
Moonrise: 7:57 PM
Moon Transit: 12:00 AM
Moonset: 4:20 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:12 PM - 4:42 PM

Minor Periods

7:27 PM - 8:57 PM
3:50 AM - 5:20 AM

Action Rating: 4 out of 5

Flood Watch issued July 28 at 2:09PM EDT until July 29 at 8:00PM EDT by NWS Boston/Norton MA

Effective: Tue July 28, 2026, 2:09 PM
Expires: Wed July 29, 2026, 5:00 AM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of northern Connecticut, including the following area, Windham CT, central Massachusetts, including the following areas, Northern Worcester MA and Southern Worcester MA, and northern Rhode Island, including the following areas, Northwest Providence RI and Southeast Providence RI. * WHEN...Through Wednesday evening. * 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. * ADDITIONAL DETAILS... - Moderate to heavy rainfall is expected to develop Tuesday afternoon into Wednesday across the Watch area. The heaviest rainfall is expected Tuesday evening into Wednesday. Excessive rainfall rates are possible, which could trigger instances of street flooding and contribute to rises on rivers, streams and larger river basins. Two to four inches of rain are expected in the Watch area, with locally higher amounts possible especially along the eastern slopes of the Worcester Hills. - http://www.weather.gov/safety/flood - 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.


Flood Watch issued July 28 at 2:25PM EDT until July 29 at 8:00PM EDT by NWS Upton NY

Effective: Tue July 28, 2026, 2:25 PM
Expires: Wed July 29, 2026, 6:15 AM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of southern Connecticut, including the following areas, Northern New London and Southern New London and southeast New York, including the following areas, Northeast Suffolk and Southeast Suffolk. * WHEN...From 8 PM EDT this evening through Wednesday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - A slow moving low pressure system will bring heavy showers and thunderstorms to the area tonight through Wednesday. Average rainfall amounts are expected to be between 2 and 3 inches with localized higher amounts. Peak hourly rainfall rates could be as high as 1.5 to 2.5 inches in the heaviest showers and thunderstorms. - 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.


Small Craft Advisory issued July 28 at 2:59AM EDT until July 29 at 2:00PM EDT by NWS Upton NY

Effective: Tue July 28, 2026, 2:59 AM
Expires: Tue July 28, 2026, 4:00 PM

* WHAT...Southeast winds 10 to 20 kt with gusts up to 30 kt. * WHERE...Long Island Sound east of Port Jefferson and New Haven, and Peconic and Gardiners Bays. * WHEN...From 6 PM this evening to 2 PM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

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


Small Craft Advisory issued July 28 at 2:35PM EDT until July 29 at 2:00PM EDT by NWS Upton NY

Effective: Tue July 28, 2026, 2:35 PM
Expires: Wed July 29, 2026, 6:00 AM

* WHAT...Southeast winds 10 to 15 kt with gusts up to 25 kt. * WHERE...Long Island Sound east of Port Jefferson and New Haven, and Peconic and Gardiners Bays. * WHEN...From 6 PM this evening to 2 PM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

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


Tuesday, July 28, 2026

Weather Forecast

Sunny
83.3°F
67.8°F
74.2°F
86%
0 in
15%
0%
15.4 mph
7.6


Air Quality

AQI: 1 - Good
PM2.5: 13.85 μg/m3
PM10: 18.71 μg/m3
Carbon Monoxide: 115.71 μg/m3
Nitrogen Dioxide: 2.67 μg/m3
Sulphur Dioxide: 0.51 μg/m3
Ozone: 109.08 μg/m3

Astronomical

Sunrise: 5:39 AM
Sun Transit: 12:54 AM
Sunset: 8:09 PM
Daylight: 14 hrs 30 mins
Moonrise: 7:57 PM
Moon Transit: 12:00 AM
Moonset: 4:20 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:12 PM - 4:42 PM

Minor Periods

7:27 PM - 8:57 PM
3:50 AM - 5:20 AM

Action Rating: 4 out of 5

Wednesday, July 29, 2026

Weather Forecast

Light drizzle
71.2°F
65.2°F
68.6°F
94%
0.86 in
91%
0%
18.1 mph
5.1


Air Quality

AQI: 1 - Good
PM2.5: 10.26 μg/m3
PM10: 14.01 μg/m3
Carbon Monoxide: 124.92 μg/m3
Nitrogen Dioxide: 2.66 μg/m3
Sulphur Dioxide: 0.45 μg/m3
Ozone: 96.38 μg/m3

Astronomical

Sunrise: 5:40 AM
Sun Transit: 12:54 AM
Sunset: 8:08 PM
Daylight: 14 hrs 28 mins
Moonrise: 8:26 PM
Moon Transit: 12:37 AM
Moonset: 5:24 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:07 AM - 2:37 AM
3:00 PM - 5:30 PM

Minor Periods

7:56 PM - 9:26 PM
4:54 AM - 6:24 AM

Action Rating: 4 out of 5

Thursday, July 30, 2026

Weather Forecast

Patchy rain nearby
65.1°F
63.5°F
64.6°F
91%
0.11 in
84%
0%
14.1 mph
1.5


Air Quality

AQI: 1 - Good
PM2.5: 6.93 μg/m3
PM10: 8.6 μg/m3
Carbon Monoxide: 152.92 μg/m3
Nitrogen Dioxide: 5.08 μg/m3
Sulphur Dioxide: 1.14 μg/m3
Ozone: 91.46 μg/m3

Astronomical

Sunrise: 5:41 AM
Sun Transit: 12:54 AM
Sunset: 8:07 PM
Daylight: 14 hrs 26 mins
Moonrise: 8:51 PM
Moon Transit: 1:24 AM
Moonset: 6:31 AM
Moon Phase: Full
Moon Illumination: 97.1%

Best Times for Fishing or Hunting

Major Periods

12:54 AM - 3:24 AM
3:45 PM - 6:15 PM

Minor Periods

8:21 PM - 9:51 PM
6:01 AM - 7:31 AM

Action Rating: 5 out of 5

Friday, July 31, 2026

Weather Forecast

Patchy rain nearby
75.4°F
64.6°F
69.5°F
79%
0.02 in
38%
0%
12.5 mph
6.6


Air Quality

AQI: 1 - Good
PM2.5: 3.54 μg/m3
PM10: 4.04 μg/m3
Carbon Monoxide: 156.85 μg/m3
Nitrogen Dioxide: 4.6 μg/m3
Sulphur Dioxide: 0.63 μg/m3
Ozone: 98.71 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 12:54 AM
Sunset: 8:06 PM
Daylight: 14 hrs 24 mins
Moonrise: 9:13 PM
Moon Transit: 2:08 AM
Moonset: 7:36 AM
Moon Phase: Full
Moon Illumination: 92.0%

Best Times for Fishing or Hunting

Major Periods

1:38 AM - 4:08 AM
4:30 PM - 7:00 PM

Minor Periods

8:43 PM - 10:13 PM
7:06 AM - 8:36 AM

Action Rating: 3 out of 5

Saturday, August 1, 2026

Weather Forecast

Sunny
77.9°F
64.4°F
70.9°F
79%
0 in
9%
0%
8.9 mph
8.7


Air Quality

AQI: 1 - Good
PM2.5: 1.83 μg/m3
PM10: 2.18 μg/m3
Carbon Monoxide: 211.22 μg/m3
Nitrogen Dioxide: 3.82 μg/m3
Sulphur Dioxide: 0.54 μg/m3
Ozone: 80.78 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 12:54 AM
Sunset: 8:05 PM
Daylight: 14 hrs 22 mins
Moonrise: 9:34 PM
Moon Transit: 2:52 AM
Moonset: 8:42 AM
Moon Phase: Waning Gibbous
Moon Illumination: 84.9%

Best Times for Fishing or Hunting

Major Periods

2:22 AM - 4:52 AM
5:12 PM - 7:42 PM

Minor Periods

9:04 PM - 10:34 PM
8:12 AM - 9:42 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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