Water Temperature of the Mill River in Southport, CT

Current Water Temperature

49.5°F 9.7°C
Frigid Dangerously Cold
49.5°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: Thursday, April 18, 2024, 5:06 AM EDT

Temperature Locations

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Local Points of Interest

Perry's Green

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Mill River

Station Name: MILL RIVER AT PEQUOT YACHT CLUB AT SOUTHPORT, CT
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 0 feet

Nearest Address:
657 Harbor Rd
Southport, CT 06890
Fairfield County

GPS Coordinates: 41.1325083, -73.2824833

Nearby Water Temperatures

Mill River, Fairfield, CT (0.6 mi)
Saugatuck River, Westport Village, CT (4.6 mi)
Rooster River, Bridgeport, CT (4.6 mi)
Saugatuck River, Westport, CT (4.8 mi)
Bridgeport Harbor, Bridgeport, CT (6 mi)
Norwalk River, Norwalk, CT (6.8 mi)
Norwalk Harbor, Norwalk, CT (7 mi)
Norwalk River, Norwalk, CT (7.3 mi)
Housatonic River, Stratford, CT (9.2 mi)
Flax Pond, Old Field, NY (13.8 mi)
New Haven Harbor, New Haven, CT (22.1 mi)
Frost Creek, Lattingtown, NY (22.6 mi)
Naugatuck River, Beacon Falls, CT (24.3 mi)
East Creek, Sands Point, NY (28.9 mi)
Great South Bay, West Sayville, NY (30.1 mi)

Weather for Southport, Connecticut

Current Weather

53.2°F
Overcast
Conditions: Overcast
Humidity: 74%
Feels Like: 50.4°F
Wind: SSE 3.8 mph
Wind Gusts: 5.8 mph
Pressure: 29.8 in
Precipitation: 0 in
Cloud Cover: 100%
Visibility: 13.3 mi
UV Index: 0

Five-Day Weather Forecast

Overcast
Wed
H: 60°F
L: 44°F
Moderate Rain
Thu
H: 57°F
L: 46°F
Moderate Rain
Fri
H: 46°F
L: 39°F
Overcast
Sat
H: 46°F
L: 37°F
Overcast
Sun
H: 47°F
L: 35°F

Air Quality

EPA Index 1 • Good

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

PM2.5
13.7 μg/m³
Moderate
PM10
15 μg/m³
Good
Ozone (O3)
13 μg/m³
Photochemical
NO2
53.4 μg/m³
Nitrogen Dioxide
SO2
3.1 μg/m³
Sulfur Dioxide
CO
193 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 1m daylight
Sunrise 6:37 AM
Solar Noon 11:37 AM
Sunset 4:38 PM
Moon
New • 2%
Moonrise 9:10 AM
Transit 1:31 PM
Moonset 5:51 PM

Best Times for Fishing or Hunting

Major Periods

12:35 AM - 3:05 AM
1:01 PM - 3:31 PM

Minor Periods

8:40 AM - 10:10 AM
5:21 PM - 6:51 PM
Action Rating:
Good Action 3/5
Wednesday, November 11, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 52.7°F
Average Humidity: 63%
Chance of Rain: 4%
Wind: 12.2 mph
UV Index: 3.3

Air Quality

EPA Index 1 • Good
PM2.5
5.6 μg/m³
Good
PM10
5.9 μg/m³
Good
Ozone (O3)
43.4 μg/m³
Photochemical
NO2
21.3 μg/m³
Nitrogen Dioxide
SO2
1.7 μg/m³
Sulfur Dioxide
CO
189.1 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 1m daylight
Sunrise 6:37 AM
Solar Noon 11:37 AM
Sunset 4:38 PM
Moon
New • 2%
Moonrise 9:10 AM
Transit 1:31 PM
Moonset 5:51 PM

Best Times for Fishing or Hunting

Major Periods

12:35 AM - 3:05 AM
1:01 PM - 3:31 PM

Minor Periods

8:40 AM - 10:10 AM
5:21 PM - 6:51 PM
Action Rating:
Good Action 3/5
Thursday, November 12, 2026

Weather Forecast

Conditions: Moderate Rain
Average Temperature: 50.4°F
Average Humidity: 79%
Chance of Rain: 80%
Wind: 20.1 mph
UV Index: 2

Air Quality

EPA Index 2 • Moderate
PM2.5
7.6 μg/m³
Good
PM10
9.6 μg/m³
Good
Ozone (O3)
54.8 μg/m³
Photochemical
NO2
16.3 μg/m³
Nitrogen Dioxide
SO2
1.1 μg/m³
Sulfur Dioxide
CO
160.2 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 59m daylight
Sunrise 6:38 AM
Solar Noon 11:37 AM
Sunset 4:37 PM
Moon
Waxing Crescent • 6%
Moonrise 10:04 AM
Transit 2:22 PM
Moonset 6:43 PM

Best Times for Fishing or Hunting

Major Periods

1:27 AM - 3:57 AM
1:52 PM - 4:22 PM

Minor Periods

9:34 AM - 11:04 AM
6:13 PM - 7:43 PM
Action Rating:
Good Action 3/5
Friday, November 13, 2026

Weather Forecast

Conditions: Moderate Rain
Average Temperature: 41.4°F
Average Humidity: 87%
Chance of Rain: 83%
Wind: 17.1 mph
UV Index: 0.4

Air Quality

EPA Index 1 • Good
PM2.5
2 μg/m³
Good
PM10
2.2 μg/m³
Good
Ozone (O3)
60 μg/m³
Photochemical
NO2
7.1 μg/m³
Nitrogen Dioxide
SO2
0.7 μg/m³
Sulfur Dioxide
CO
142.8 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 57m daylight
Sunrise 6:39 AM
Solar Noon 11:37 AM
Sunset 4:36 PM
Moon
Waxing Crescent • 13%
Moonrise 10:50 AM
Transit 3:13 PM
Moonset 7:41 PM

Best Times for Fishing or Hunting

Major Periods

2:18 AM - 4:48 AM
2:43 PM - 5:13 PM

Minor Periods

10:20 AM - 11:50 AM
7:11 PM - 8:41 PM
Action Rating:
Fair Action 2/5
Saturday, November 14, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 41°F
Average Humidity: 66%
Chance of Rain: 19%
Wind: 11.8 mph
UV Index: 3.1

Air Quality

EPA Index 1 • Good
PM2.5
2.9 μg/m³
Good
PM10
3 μg/m³
Good
Ozone (O3)
52.5 μg/m³
Photochemical
NO2
8.2 μg/m³
Nitrogen Dioxide
SO2
0.6 μg/m³
Sulfur Dioxide
CO
133.2 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 55m daylight
Sunrise 6:40 AM
Solar Noon 11:37 AM
Sunset 4:35 PM
Moon
Waxing Crescent • 21%
Moonrise 11:28 AM
Transit 4:02 PM
Moonset 8:42 PM

Best Times for Fishing or Hunting

Major Periods

3:08 AM - 5:38 AM
3:32 PM - 6:02 PM

Minor Periods

10:58 AM - 12:28 PM
8:12 PM - 9:42 PM
Action Rating:
Fair Action 2/5
Sunday, November 15, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 40.1°F
Average Humidity: 64%
Chance of Rain: 0%
Wind: 11.9 mph
UV Index: 3.1

Air Quality

EPA Index 1 • Good
PM2.5
1.8 μg/m³
Good
PM10
1.8 μg/m³
Good
Ozone (O3)
56.2 μg/m³
Photochemical
NO2
6.2 μg/m³
Nitrogen Dioxide
SO2
0.4 μg/m³
Sulfur Dioxide
CO
137.6 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 53m daylight
Sunrise 6:41 AM
Solar Noon 11:37 AM
Sunset 4:34 PM
Moon
Waxing Crescent • 31%
Moonrise 12:00 PM
Transit 4:48 PM
Moonset 9:45 PM

Best Times for Fishing or Hunting

Major Periods

3:55 AM - 6:25 AM
4:18 PM - 6:48 PM

Minor Periods

11:30 AM - 1:00 PM
9:15 PM - 10:45 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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