Water Temperature of Mystic Harbor in Mystic, CT

Current Water Temperature

47.3°F 8.5°C
Frigid Dangerously Cold
47.3°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: Wednesday, April 5, 2023, 7:54 AM EDT

Temperature Locations

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Local Points of Interest

Mason Island

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Mystic Harbor

Station Name: MYSTIC HARBOR AT SAFE HARBOR MARINA NR MYSTIC, CT
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 0 feet

Nearest Address:
99 Roseleah Dr
Mystic, CT 06355
New London County

GPS Coordinates: 41.3464722, -71.9688611

Nearby Water Temperatures

Mystic River, Mystic, CT (1 mi)
Mystic River, Noank, CT (1.5 mi)
Mystic River, Old Mystic, CT (2.2 mi)
Thames River, Groton, CT (5.9 mi)
Thames River, New London, CT (6.8 mi)
Pawcatuck River, Westerly, RI (7.5 mi)
Yantic River, Norwich, CT (16.7 mi)
Connecticut River, Old Lyme, CT (19.7 mi)
East Branch Eightmile River, Lyme, CT (19.8 mi)
Eightmile River, East Haddam, CT (20 mi)
Fort Pond Bay, Montauk, NY (20.6 mi)
Orient Harbor, Orient, NY (22.8 mi)
Connecticut River, Middletown, CT (33.1 mi)
Natchaug River, Chaplin, CT (33.2 mi)
Great Harbor, North Kingstown, RI (33.4 mi)

Weather for Mystic, Connecticut

Current Weather

52.5°F
Clear
Conditions: Clear
Humidity: 64%
Feels Like: 43.7°F
Wind: WNW 18.3 mph
Wind Gusts: 26 mph
Pressure: 29.69 in
Precipitation: 0 in
Cloud Cover: 5%
Visibility: 6 mi
UV Index: 0

Weather Forecast

Sunny
Mon
H: 55°F
L: 48°F
Sunny
Tue
H: 58°F
L: 47°F
Sunny
Wed
H: 55°F
L: 48°F

Air Quality

EPA Index 1 • Good

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

PM2.5
5.7 μg/m³
Good
PM10
5.7 μg/m³
Good
Ozone (O3)
52 μg/m³
Photochemical
NO2
11.9 μg/m³
Nitrogen Dioxide
SO2
2.1 μg/m³
Sulfur Dioxide
CO
165 μg/m³
Carbon Monoxide

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

Small Craft Advisory issued November 8 at 2:02PM EST until November 9 at 6:00PM EST by NWS Upton NY

Effective: Sun November 8, 2026, 2:02 PM
Expires: Mon November 9, 2026, 4:00 AM

* WHAT...West winds 10 to 20 kt with gusts up to 25 kt and seas 1 to 3 feet. * 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 9 at 2:18AM EST until November 9 at 11:00PM EST by NWS Upton NY

Effective: Mon November 9, 2026, 2:18 AM
Expires: Mon November 9, 2026, 6:00 PM

* WHAT...West winds 15 to 20 kt with gusts up to 25 kt and seas 2 to 4 feet. * WHERE...Long Island Sound east of Orient Point and the Connecticut River. * WHEN...Until 11 PM EST this evening. * IMPACTS...Conditions will be hazardous to small craft.


Small Craft Advisory issued November 9 at 2:18AM EST until November 9 at 6:00PM EST by NWS Upton NY

Effective: Mon November 9, 2026, 2:18 AM
Expires: Mon November 9, 2026, 6:00 PM

* WHAT...West winds 15 to 20 kt with gusts up to 25 kt and seas 1 to 3 feet. * WHERE...Long Island Sound west of the Orient Point and the Connecticut River, New York Harbor, Peconic and Gardiners Bays, and South Shore Bays from Jones Inlet through Shinnecock Bay. * WHEN...Until 6 PM EST this evening. * IMPACTS...Conditions will be hazardous to small craft.
Monday, November 9, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 51.8°F
Average Humidity: 69%
Chance of Rain: 36%
Wind: 21.7 mph
UV Index: 1.7

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: 52.2°F
Average Humidity: 69%
Chance of Rain: 7%
Wind: 22.4 mph
UV Index: 2.3

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
Wednesday, November 11, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 51.3°F
Average Humidity: 64%
Chance of Rain: 7%
Wind: 20.4 mph
UV Index: 2.2

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
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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