Water Temperature of Great South Bay in West Sayville, NY

Current Water Temperature

35.8°F 2.1°C
Frigid Dangerously Cold
35.8°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, February 13, 2025, 6:54 PM EST

Temperature Locations

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Local Points of Interest

Green Creek; Sayville Beach & Marina

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Great South Bay

Station Name: GREAT SOUTH BAY AT WEST SAYVILLE NY
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 0 feet

Nearest Address:
198 Atlantic Ave
West Sayville, NY 11796
Suffolk County

GPS Coordinates: 40.72105556, -73.09125

Nearby Water Temperatures

Flax Pond, Old Field, NY (16.9 mi)
Reynolds Channel, Point Lookout, NY (27.3 mi)
Peconic River, Riverhead, NY (27.3 mi)
Frost Creek, Lattingtown, NY (29.2 mi)
Hempstead Lake, Lakeview, NY (29.2 mi)
Mill River, Fairfield, CT (29.7 mi)
Norwalk Harbor, Norwalk, CT (29.8 mi)
Saugatuck River, Westport, CT (30.1 mi)
Mill River, Southport, CT (30.1 mi)
Hog Island Channel, Island Park, NY (30.6 mi)
Norwalk River, Norwalk, CT (31.3 mi)
Saugatuck River, Westport Village, CT (31.4 mi)
Bridgeport Harbor, Bridgeport, CT (31.6 mi)
Norwalk River, Norwalk, CT (31.7 mi)
Housatonic River, Stratford, CT (32.3 mi)

Weather for West Sayville, New York

Current Weather

55.6°F
Clear
Conditions: Clear
Humidity: 54%
Feels Like: 48.6°F
Wind: WSW 10.6 mph
Wind Gusts: 17.2 mph
Pressure: 29.86 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 21.3 mi
UV Index: 0

Weather Forecast

Overcast
Tue
H: 59°F
L: 44°F
Overcast
Wed
H: 59°F
L: 45°F
Light Drizzle
Thu
H: 60°F
L: 51°F
Overcast
Fri
H: 51°F
L: 42°F
Overcast
Sat
H: 46°F
L: 41°F

Air Quality

EPA Index 1 • Good

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

PM2.5
11.3 μg/m³
Good
PM10
11.6 μg/m³
Good
Ozone (O3)
37 μg/m³
Photochemical
NO2
35.1 μg/m³
Nitrogen Dioxide
SO2
3.9 μg/m³
Sulfur Dioxide
CO
206 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 5m daylight
Sunrise 6:34 AM
Solar Noon 11:36 AM
Sunset 4:39 PM
Moon
New • 0%
Moonrise 8:08 AM
Transit 12:39 PM
Moonset 5:07 PM

Best Times for Fishing or Hunting

Major Periods

12:09 PM - 2:39 PM
11:44 PM - 2:14 AM

Minor Periods

7:38 AM - 9:08 AM
4:37 PM - 6:07 PM
Action Rating:
Very Good 4/5
Tuesday, November 10, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 52°F
Average Humidity: 59%
Chance of Rain: 1%
Wind: 16.2 mph
UV Index: 3.3

Air Quality

EPA Index 1 • Good
PM2.5
7.9 μg/m³
Good
PM10
8.2 μg/m³
Good
Ozone (O3)
40.5 μg/m³
Photochemical
NO2
23.3 μg/m³
Nitrogen Dioxide
SO2
2.6 μg/m³
Sulfur Dioxide
CO
185.5 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 5m daylight
Sunrise 6:34 AM
Solar Noon 11:36 AM
Sunset 4:39 PM
Moon
New • 0%
Moonrise 8:08 AM
Transit 12:39 PM
Moonset 5:07 PM

Best Times for Fishing or Hunting

Major Periods

12:09 PM - 2:39 PM
11:44 PM - 2:14 AM

Minor Periods

7:38 AM - 9:08 AM
4:37 PM - 6:07 PM
Action Rating:
Very Good 4/5
Wednesday, November 11, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 52.9°F
Average Humidity: 64%
Chance of Rain: 1%
Wind: 11.9 mph
UV Index: 3.2

Air Quality

EPA Index 1 • Good
PM2.5
7.3 μg/m³
Good
PM10
8.1 μg/m³
Good
Ozone (O3)
42 μg/m³
Photochemical
NO2
22.8 μg/m³
Nitrogen Dioxide
SO2
2.1 μg/m³
Sulfur Dioxide
CO
186.4 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 3m daylight
Sunrise 6:35 AM
Solar Noon 11:36 AM
Sunset 4:38 PM
Moon
New • 2%
Moonrise 9:08 AM
Transit 1:30 PM
Moonset 5:52 PM

Best Times for Fishing or Hunting

Major Periods

12:34 AM - 3:04 AM
1:00 PM - 3:30 PM

Minor Periods

8:38 AM - 10:08 AM
5:22 PM - 6:52 PM
Action Rating:
Good Action 3/5
Thursday, November 12, 2026

Weather Forecast

Conditions: Light Drizzle
Average Temperature: 55.4°F
Average Humidity: 75%
Chance of Rain: 77%
Wind: 19.8 mph
UV Index: 1.5

Air Quality

EPA Index 1 • Good
PM2.5
6 μg/m³
Good
PM10
8.6 μg/m³
Good
Ozone (O3)
68 μg/m³
Photochemical
NO2
6.1 μg/m³
Nitrogen Dioxide
SO2
0.8 μg/m³
Sulfur Dioxide
CO
128.7 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 1m daylight
Sunrise 6:36 AM
Solar Noon 11:36 AM
Sunset 4:37 PM
Moon
Waxing Crescent • 6%
Moonrise 10:01 AM
Transit 2:22 PM
Moonset 6:44 PM

Best Times for Fishing or Hunting

Major Periods

1:26 AM - 3:56 AM
1:52 PM - 4:22 PM

Minor Periods

9:31 AM - 11:01 AM
6:14 PM - 7:44 PM
Action Rating:
Good Action 3/5
Friday, November 13, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 46.8°F
Average Humidity: 66%
Chance of Rain: 80%
Wind: 15.7 mph
UV Index: 2.2

Air Quality

EPA Index 1 • Good
PM2.5
1.3 μg/m³
Good
PM10
1.6 μg/m³
Good
Ozone (O3)
64.5 μg/m³
Photochemical
NO2
6.4 μg/m³
Nitrogen Dioxide
SO2
0.5 μg/m³
Sulfur Dioxide
CO
137 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 59m daylight
Sunrise 6:37 AM
Solar Noon 11:36 AM
Sunset 4:36 PM
Moon
Waxing Crescent • 13%
Moonrise 10:48 AM
Transit 3:12 PM
Moonset 7:41 PM

Best Times for Fishing or Hunting

Major Periods

2:17 AM - 4:47 AM
2:42 PM - 5:12 PM

Minor Periods

10:18 AM - 11:48 AM
7:11 PM - 8:41 PM
Action Rating:
Fair Action 2/5
Saturday, November 14, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 43.2°F
Average Humidity: 65%
Chance of Rain: 41%
Wind: 11.9 mph
UV Index: 1.6

Air Quality

EPA Index 1 • Good
PM2.5
2.2 μg/m³
Good
PM10
2.3 μg/m³
Good
Ozone (O3)
54.4 μg/m³
Photochemical
NO2
6.4 μg/m³
Nitrogen Dioxide
SO2
1.1 μg/m³
Sulfur Dioxide
CO
149.1 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 57m daylight
Sunrise 6:38 AM
Solar Noon 11:36 AM
Sunset 4:35 PM
Moon
Waxing Crescent • 21%
Moonrise 11:26 AM
Transit 4:01 PM
Moonset 8:43 PM

Best Times for Fishing or Hunting

Major Periods

3:07 AM - 5:37 AM
3:31 PM - 6:01 PM

Minor Periods

10:56 AM - 12:26 PM
8:13 PM - 9:43 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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