Water Temperature of the Mystic River in Old Mystic, CT

Current Water Temperature

54.5°F 12.5°C
Cold Thermal Gear Required
54.5°F
Frigid < 50°F
Cold 50°–60°
Cool 60°–70°
Comfortable 70°–80°
Warm 80°+

Cold shock risk with rapid dexterity loss (10–15 mins). Wetsuit or drysuit strongly advised for any immersion.

Measurement Time: Wednesday, April 5, 2023, 10:36 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)

Marine Weather for the Mystic River in Old Mystic, CT

Marine Weather

Coastal & Marine Conditions
Open-Meteo Marine
1.5ft 0.5 m
Light Chop Gentle waves and light chop, ideal for water activities.
Wave Period 3.8s
Wave Direction 274° W
Swell Waves
0.6 ft
3.2s • 248° WSW
Wind Waves / Chop
1.2 ft
2.4s • 304° NW
Ocean Current
1.3 mph
1.1 kn • 105° ESE
Sea Surface Temp
56.3°F
Equivalent: 13.5°C

High & Low Tide Forecast

Rising (Flood)
Next Tide: High 8:00 AM (-0.3 ft)
0.0 ft (MSL) Sat, Nov 14 12 AM 6 AM 12 PM 6 PM 12 AM 6 AM Sun, Nov 15 Mon, Nov 16 ▲ High 8:00 PM -0.6 ft ▼ Low 11:00 PM -2.2 ft ▲ High 1:00 AM -2.0 ft ▼ Low 2:00 AM -2.2 ft ▲ High 8:00 AM -0.3 ft ▼ Low 12:00 PM -2.3 ft ▲ High 1:00 PM -2.2 ft ▼ Low 3:00 PM -2.5 ft ▲ High 9:00 PM -0.8 ft ▼ Low 12:00 AM -2.2 ft ▲ High 1:00 AM -2.2 ft ▼ Low 3:00 AM -2.4 ft NOW
High Tide Sat, Nov 14
8:00 PM
-0.6 ft (-0.17 m)
Low Tide Sat, Nov 14
11:00 PM
-2.2 ft (-0.67 m)
High Tide Sun, Nov 15
1:00 AM
-2.0 ft (-0.62 m)
Low Tide Sun, Nov 15
2:00 AM
-2.2 ft (-0.67 m)
Open-Meteo Tidal Model (Mean Sea Level MSL datum) • Times in station local timezone.

5-Day Marine Wave Forecast

Today
Nov 15
1.6 ft
3.8s • WNW
Mon
Nov 16
1.0 ft
4.5s • NW
Tue
Nov 17
1.4 ft
6.8s • SSW
Wed
Nov 18
1.5 ft
3.8s • WSW
Thu
Nov 19
1.1 ft
4.8s • SSW

Weather for Old Mystic, Connecticut

Current Weather

35.2°F
Clear
Conditions: Clear
Humidity: 80%
Feels Like: 28.6°F
Wind: NW 6 mph
Wind Gusts: 20.1 mph
Pressure: 29.93 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 11.2 mi
UV Index: 0

Five-Day Weather Forecast

Overcast
Sun
H: 48°F
L: 34°F
Overcast
Mon
H: 47°F
L: 34°F
Partly Cloudy
Tue
H: 55°F
L: 33°F
Mainly Sunny
Wed
H: 59°F
L: 40°F
Overcast
Thu
H: 59°F
L: 42°F

Air Quality

EPA Index 1 • Good

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

PM2.5
0.4 μg/m³
Good
PM10
0.4 μg/m³
Good
Ozone (O3)
57 μg/m³
Photochemical
NO2
1.9 μg/m³
Nitrogen Dioxide
SO2
0.4 μg/m³
Sulfur Dioxide
CO
129 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 52m daylight
Sunrise 6:37 AM
Solar Noon 11:32 AM
Sunset 4:28 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
Sunday, November 15, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 39.7°F
Average Humidity: 73%
Chance of Rain: 3%
Wind: 10.6 mph
UV Index: 3.1

Air Quality

EPA Index 1 • Good
PM2.5
0.7 μg/m³
Good
PM10
0.8 μg/m³
Good
Ozone (O3)
59.1 μg/m³
Photochemical
NO2
2.5 μg/m³
Nitrogen Dioxide
SO2
0.5 μg/m³
Sulfur Dioxide
CO
136.5 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 52m daylight
Sunrise 6:37 AM
Solar Noon 11:32 AM
Sunset 4:28 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
Monday, November 16, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 38.8°F
Average Humidity: 78%
Chance of Rain: 1%
Wind: 9.9 mph
UV Index: 3

Air Quality

EPA Index 1 • Good
PM2.5
1.5 μg/m³
Good
PM10
1.6 μg/m³
Good
Ozone (O3)
66.2 μg/m³
Photochemical
NO2
3.8 μg/m³
Nitrogen Dioxide
SO2
0.4 μg/m³
Sulfur Dioxide
CO
151.7 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 50m daylight
Sunrise 6:38 AM
Solar Noon 11:32 AM
Sunset 4:28 PM
Moon
First Quarter • 42%
Moonrise 12:22 PM
Transit 5:27 PM
Moonset 10:43 PM

Best Times for Fishing or Hunting

Major Periods

4:35 AM - 7:05 AM
4:57 PM - 7:27 PM

Minor Periods

11:52 AM - 1:22 PM
10:13 PM - 11:43 PM
Action Rating:
Very Good 4/5
Tuesday, November 17, 2026

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 42.3°F
Average Humidity: 74%
Chance of Rain: 0%
Wind: 8.4 mph
UV Index: 3

Air Quality

EPA Index 1 • Good
PM2.5
5.6 μg/m³
Good
PM10
5.7 μg/m³
Good
Ozone (O3)
55.5 μg/m³
Photochemical
NO2
8.7 μg/m³
Nitrogen Dioxide
SO2
1.1 μg/m³
Sulfur Dioxide
CO
185.7 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 48m daylight
Sunrise 6:39 AM
Solar Noon 11:32 AM
Sunset 4:27 PM
Moon
First Quarter • 54%
Moonrise 12:45 PM
Transit 6:10 PM
Moonset 11:46 PM

Best Times for Fishing or Hunting

Major Periods

5:19 AM - 7:49 AM
5:40 PM - 8:10 PM

Minor Periods

12:15 PM - 1:45 PM
11:16 PM - 12:46 AM
Action Rating:
Fair Action 2/5
Wednesday, November 18, 2026

Weather Forecast

Conditions: Mainly Sunny
Average Temperature: 47.3°F
Average Humidity: 67%
Chance of Rain: 0%
Wind: 8.8 mph
UV Index: 3.1

Air Quality

EPA Index 1 • Good
PM2.5
8 μg/m³
Good
PM10
8 μg/m³
Good
Ozone (O3)
46.5 μg/m³
Photochemical
NO2
17.1 μg/m³
Nitrogen Dioxide
SO2
1.5 μg/m³
Sulfur Dioxide
CO
202.6 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 46m daylight
Sunrise 6:40 AM
Solar Noon 11:33 AM
Sunset 4:26 PM
Moon
First Quarter • 65%
Moonrise 1:06 PM
Transit 6:53 PM
Moonset 1:32 AM

Best Times for Fishing or Hunting

Major Periods

6:02 AM - 8:32 AM
6:23 PM - 8:53 PM

Minor Periods

1:02 AM - 2:32 AM
12:36 PM - 2:06 PM
Action Rating:
Fair Action 2/5
Thursday, November 19, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 48.9°F
Average Humidity: 65%
Chance of Rain: 0%
Wind: 5.9 mph
UV Index: 3

Air Quality

EPA Index 2 • Moderate
PM2.5
10.9 μg/m³
Good
PM10
11.2 μg/m³
Good
Ozone (O3)
33.6 μg/m³
Photochemical
NO2
28.7 μg/m³
Nitrogen Dioxide
SO2
1.3 μg/m³
Sulfur Dioxide
CO
270.9 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 44m daylight
Sunrise 6:41 AM
Solar Noon 11:33 AM
Sunset 4:25 PM
Moon
Waxing Gibbous • 75%
Moonrise 1:27 PM
Transit 12:00 PM
Moonset 12:51 AM

Best Times for Fishing or Hunting

Major Periods

11:30 AM - 2:00 PM
11:55 PM - 2:25 AM

Minor Periods

12:21 AM - 1:51 AM
12:57 PM - 2:27 PM
Action Rating:
Fair Action 2/5
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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