Water Temperature of the Mystic River in Mystic, CT

Current Water Temperature

49.1°F 9.5°C
Frigid Dangerously Cold
49.1°F
Frigid < 50°F
Cold 50°–60°
Cool 60°–70°
Comfortable 70°–80°
Warm 80°+

Severe hypothermia and cold water shock risk. Unprotected swimming causes rapid loss of dexterity in under 5 minutes.

Measurement Time: Monday, April 10, 2023, 5:48 AM EDT

Temperature Locations

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Local Points of Interest

Mystic Seaport

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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

57.4°F
Patchy rain nearby
Conditions: Patchy rain nearby
Humidity: 62%
Feels Like: 45.5°F
Wind: W 19 mph
Wind Gusts: 26.8 mph
Pressure: 29.75 in
Precipitation: 0 in
Cloud Cover: 96%
Visibility: 6 mi
UV Index: 1.4

Weather Forecast

Sunny
Sun
H: 57°F
L: 49°F
Sunny
Mon
H: 54°F
L: 48°F
Sunny
Tue
H: 58°F
L: 46°F

Air Quality

EPA Index 1 • Good

Air quality is satisfactory, and air pollution poses little or no risk.

PM2.5
0.8 μg/m³
Good
PM10
0.8 μg/m³
Good
Ozone (O3)
58 μg/m³
Photochemical
NO2
1.6 μg/m³
Nitrogen Dioxide
SO2
0.7 μg/m³
Sulfur Dioxide
CO
137 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 7m daylight
Sunrise 6:28 AM
Solar Noon 11:31 AM
Sunset 4:35 PM
Moon
New • 0%
Moonrise 5:55 AM
Transit 10:56 AM
Moonset 3:51 PM

Best Times for Fishing or Hunting

Major Periods

10:26 AM - 12:56 PM
10:50 PM - 1:20 AM

Minor Periods

5:25 AM - 6:55 AM
3:21 PM - 4:51 PM
Action Rating:
Peak Action 5/5

Small Craft Advisory issued November 8 at 1:48AM EST until November 9 at 6:00PM EST by NWS Upton NY

Effective: Sun November 8, 2026, 1:48 AM
Expires: Sun November 8, 2026, 3:00 PM

* WHAT...West winds 10 to 20 kt with gusts up to 30 kt. * WHERE...Long Island Sound, New York Harbor, Peconic and Gardiners Bays, and South Shore Bays from Jones Inlet through Shinnecock Bay. * WHEN...Until 6 PM EST Monday. * IMPACTS...Conditions will be hazardous to small craft.


Small Craft Advisory issued November 8 at 2:11AM EST until November 8 at 7:00PM EST by NWS Boston/Norton MA

Effective: Sun November 8, 2026, 2:11 AM
Expires: Sun November 8, 2026, 3:15 PM

* WHAT...West winds 15 to 25 kt with gusts up to 30 kt and seas 3 to 5 feet. * WHERE...In Massachusetts coastal waters, Nantucket Sound and Vineyard Sound. In Rhode Island coastal waters, Rhode Island Sound and Block Island Sound. * WHEN...Until 7 PM EST this evening. * IMPACTS...Conditions will be hazardous to small craft.


Small Craft Advisory issued November 8 at 7:39AM EST until November 8 at 7:00PM EST by NWS Boston/Norton MA

Effective: Sun November 8, 2026, 7:39 AM
Expires: Sun November 8, 2026, 7:00 PM

* WHAT...West winds 15 to 25 kt with gusts up to 30 kt and seas 3 to 5 feet. * WHERE...In Massachusetts coastal waters, Nantucket Sound, Vineyard Sound and Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary. In Rhode Island coastal waters, Rhode Island Sound and Block Island Sound. * WHEN...Until 7 PM EST this evening. * IMPACTS...Conditions will be hazardous to small craft.
Sunday, November 8, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 53.6°F
Average Humidity: 70%
Chance of Rain: 43%
Wind: 24.8 mph
UV Index: 1.4

Astronomical

Sun
10h 7m daylight
Sunrise 6:28 AM
Solar Noon 11:31 AM
Sunset 4:35 PM
Moon
New • 0%
Moonrise 5:55 AM
Transit 10:56 AM
Moonset 3:51 PM

Best Times for Fishing or Hunting

Major Periods

10:26 AM - 12:56 PM
10:50 PM - 1:20 AM

Minor Periods

5:25 AM - 6:55 AM
3:21 PM - 4:51 PM
Action Rating:
Peak Action 5/5
Monday, November 9, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 51.7°F
Average Humidity: 67%
Chance of Rain: 36%
Wind: 21.7 mph
UV Index: 1.8

Astronomical

Sun
10h 5m daylight
Sunrise 6:29 AM
Solar Noon 11:31 AM
Sunset 4:34 PM
Moon
New • 2%
Moonrise 7:01 AM
Transit 11:44 AM
Moonset 4:22 PM

Best Times for Fishing or Hunting

Major Periods

11:14 AM - 1:44 PM
11:39 PM - 2:09 AM

Minor Periods

6:31 AM - 8:01 AM
3:52 PM - 5:22 PM
Action Rating:
Very Good 4/5
Tuesday, November 10, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 52°F
Average Humidity: 70%
Chance of Rain: 6%
Wind: 23.7 mph
UV Index: 2.2

Astronomical

Sun
10h 3m daylight
Sunrise 6:31 AM
Solar Noon 11:31 AM
Sunset 4:33 PM
Moon
New • 0%
Moonrise 8:06 AM
Transit 12:34 PM
Moonset 5:00 PM

Best Times for Fishing or Hunting

Major Periods

12:04 PM - 2:34 PM
11:39 PM - 2:09 AM

Minor Periods

7:36 AM - 9:06 AM
4:30 PM - 6:00 PM
Action Rating:
Very Good 4/5
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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