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

45.1°F
Clear
Conditions: Clear
Humidity: 67%
Feels Like: 38.8°F
Wind: NW 7.1 mph
Wind Gusts: 19.7 mph
Pressure: 29.92 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 16 mi
UV Index: 0

Weather Forecast

Overcast
Wed
H: 57°F
L: 44°F
Moderate Rain
Thu
H: 56°F
L: 42°F
Moderate Drizzle
Fri
H: 48°F
L: 38°F
Moderate Drizzle
Sat
H: 42°F
L: 35°F
Sunny
Sun
H: 51°F
L: 34°F

Air Quality

EPA Index 1 • Good

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

PM2.5
2.3 μg/m³
Good
PM10
2.8 μg/m³
Good
Ozone (O3)
60 μg/m³
Photochemical
NO2
4.1 μg/m³
Nitrogen Dioxide
SO2
1 μg/m³
Sulfur Dioxide
CO
154 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 0m daylight
Sunrise 6:32 AM
Solar Noon 11:31 AM
Sunset 4:32 PM
Moon
New • 2%
Moonrise 9:06 AM
Transit 1:25 PM
Moonset 5:44 PM

Best Times for Fishing or Hunting

Major Periods

12:30 AM - 3:00 AM
12:55 PM - 3:25 PM

Minor Periods

8:36 AM - 10:06 AM
5:14 PM - 6:44 PM
Action Rating:
Good Action 3/5
Wednesday, November 11, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 49.8°F
Average Humidity: 64%
Chance of Rain: 1%
Wind: 8 mph
UV Index: 3.3

Air Quality

EPA Index 1 • Good
PM2.5
2.9 μg/m³
Good
PM10
3.5 μg/m³
Good
Ozone (O3)
64.2 μg/m³
Photochemical
NO2
5.2 μg/m³
Nitrogen Dioxide
SO2
0.8 μg/m³
Sulfur Dioxide
CO
217.2 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 0m daylight
Sunrise 6:32 AM
Solar Noon 11:31 AM
Sunset 4:32 PM
Moon
New • 2%
Moonrise 9:06 AM
Transit 1:25 PM
Moonset 5:44 PM

Best Times for Fishing or Hunting

Major Periods

12:30 AM - 3:00 AM
12:55 PM - 3:25 PM

Minor Periods

8:36 AM - 10:06 AM
5:14 PM - 6:44 PM
Action Rating:
Good Action 3/5
Thursday, November 12, 2026

Weather Forecast

Conditions: Moderate Rain
Average Temperature: 47.5°F
Average Humidity: 82%
Chance of Rain: 92%
Wind: 13.8 mph
UV Index: 1.9

Air Quality

EPA Index 1 • Good
PM2.5
5.7 μg/m³
Good
PM10
8.2 μg/m³
Good
Ozone (O3)
73.9 μg/m³
Photochemical
NO2
2 μg/m³
Nitrogen Dioxide
SO2
0.5 μg/m³
Sulfur Dioxide
CO
162.8 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 58m daylight
Sunrise 6:33 AM
Solar Noon 11:32 AM
Sunset 4:31 PM
Moon
Waxing Crescent • 6%
Moonrise 10:00 AM
Transit 2:17 PM
Moonset 6:37 PM

Best Times for Fishing or Hunting

Major Periods

1:21 AM - 3:51 AM
1:47 PM - 4:17 PM

Minor Periods

9:30 AM - 11:00 AM
6:07 PM - 7:37 PM
Action Rating:
Good Action 3/5
Friday, November 13, 2026

Weather Forecast

Conditions: Moderate Drizzle
Average Temperature: 41.5°F
Average Humidity: 93%
Chance of Rain: 73%
Wind: 10.7 mph
UV Index: 0.4

Air Quality

EPA Index 1 • Good
PM2.5
1.1 μg/m³
Good
PM10
1.2 μg/m³
Good
Ozone (O3)
66.7 μg/m³
Photochemical
NO2
4.2 μg/m³
Nitrogen Dioxide
SO2
0.4 μg/m³
Sulfur Dioxide
CO
139 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 56m daylight
Sunrise 6:34 AM
Solar Noon 11:32 AM
Sunset 4:30 PM
Moon
Waxing Crescent • 13%
Moonrise 10:46 AM
Transit 3:08 PM
Moonset 7:34 PM

Best Times for Fishing or Hunting

Major Periods

2:13 AM - 4:43 AM
2:38 PM - 5:08 PM

Minor Periods

10:16 AM - 11:46 AM
7:04 PM - 8:34 PM
Action Rating:
Fair Action 2/5
Saturday, November 14, 2026

Weather Forecast

Conditions: Moderate Drizzle
Average Temperature: 38.8°F
Average Humidity: 91%
Chance of Rain: 23%
Wind: 8.2 mph
UV Index: 1.2

Air Quality

EPA Index 1 • Good
PM2.5
1.1 μg/m³
Good
PM10
1.2 μg/m³
Good
Ozone (O3)
57.3 μg/m³
Photochemical
NO2
3.5 μg/m³
Nitrogen Dioxide
SO2
0.8 μg/m³
Sulfur Dioxide
CO
143.4 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 54m daylight
Sunrise 6:35 AM
Solar Noon 11:32 AM
Sunset 4:29 PM
Moon
Waxing Crescent • 21%
Moonrise 11:23 AM
Transit 3:56 PM
Moonset 8:36 PM

Best Times for Fishing or Hunting

Major Periods

3:02 AM - 5:32 AM
3:26 PM - 5:56 PM

Minor Periods

10:53 AM - 12:23 PM
8:06 PM - 9:36 PM
Action Rating:
Fair Action 2/5
Sunday, November 15, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 39.6°F
Average Humidity: 80%
Chance of Rain: 0%
Wind: 9 mph
UV Index: 3.1

Air Quality

EPA Index 1 • Good
PM2.5
1.2 μg/m³
Good
PM10
1.3 μg/m³
Good
Ozone (O3)
62.4 μg/m³
Photochemical
NO2
3 μg/m³
Nitrogen Dioxide
SO2
0.5 μg/m³
Sulfur Dioxide
CO
162.4 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 52m daylight
Sunrise 6:37 AM
Solar Noon 11:32 AM
Sunset 4:29 PM
Moon
Waxing Crescent • 31%
Moonrise 11:55 AM
Transit 4:43 PM
Moonset 9:39 PM

Best Times for Fishing or Hunting

Major Periods

3:50 AM - 6:20 AM
4:13 PM - 6:43 PM

Minor Periods

11:25 AM - 12:55 PM
9:09 PM - 10:39 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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