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

52.7°F
Clear
Conditions: Clear
Humidity: 61%
Feels Like: 44.8°F
Wind: WNW 15.7 mph
Wind Gusts: 26.1 mph
Pressure: 29.8 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 0

Weather Forecast

Sunny
Sat
H: 63°F
L: 51°F
Sunny
Sun
H: 59°F
L: 49°F
Sunny
Mon
H: 57°F
L: 49°F

Air Quality

EPA Index 1 • Good

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

PM2.5
2.4 μg/m³
Good
PM10
2.4 μg/m³
Good
Ozone (O3)
52 μg/m³
Photochemical
NO2
10.8 μg/m³
Nitrogen Dioxide
SO2
1.1 μg/m³
Sulfur Dioxide
CO
157 μg/m³
Carbon Monoxide

Astronomical

Sun
10h 12m daylight
Sunrise 6:30 AM
Solar Noon 11:36 AM
Sunset 4:42 PM
Moon
Waning Crescent • 1%
Moonrise 4:52 AM
Transit 10:15 AM
Moonset 3:30 PM

Best Times for Fishing or Hunting

Major Periods

9:45 AM - 12:15 PM
10:07 PM - 12:37 AM

Minor Periods

4:22 AM - 5:52 AM
3:00 PM - 4:30 PM
Action Rating:
Good Action 3/5

Small Craft Advisory issued November 7 at 1:51PM EST until November 8 at 6:00PM EST by NWS Upton NY

Effective: Sat November 7, 2026, 1:51 PM
Expires: Sun November 8, 2026, 3:00 AM

* WHAT...West winds 10 to 20 kt with gusts up to 30 kt and seas 2 to 4 feet expected. * 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 Sunday. * IMPACTS...Conditions will be hazardous to small craft.
Saturday, November 7, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 58.3°F
Average Humidity: 75%
Chance of Rain: 61%
Wind: 17.9 mph
UV Index: 2.3

Astronomical

Sun
10h 12m daylight
Sunrise 6:30 AM
Solar Noon 11:36 AM
Sunset 4:42 PM
Moon
Waning Crescent • 1%
Moonrise 4:52 AM
Transit 10:15 AM
Moonset 3:30 PM

Best Times for Fishing or Hunting

Major Periods

9:45 AM - 12:15 PM
10:07 PM - 12:37 AM

Minor Periods

4:22 AM - 5:52 AM
3:00 PM - 4:30 PM
Action Rating:
Good Action 3/5
Sunday, November 8, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 54.9°F
Average Humidity: 61%
Chance of Rain: 17%
Wind: 17.9 mph
UV Index: 2.4

Astronomical

Sun
10h 10m daylight
Sunrise 6:31 AM
Solar Noon 11:36 AM
Sunset 4:41 PM
Moon
New • 0%
Moonrise 5:58 AM
Transit 11:01 AM
Moonset 3:57 PM

Best Times for Fishing or Hunting

Major Periods

10:31 AM - 1:01 PM
10:54 PM - 1:24 AM

Minor Periods

5:28 AM - 6:58 AM
3:27 PM - 4:57 PM
Action Rating:
Peak Action 5/5
Monday, November 9, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 52.8°F
Average Humidity: 56%
Chance of Rain: 17%
Wind: 19.9 mph
UV Index: 2.3

Astronomical

Sun
10h 7m daylight
Sunrise 6:33 AM
Solar Noon 11:36 AM
Sunset 4:40 PM
Moon
New • 2%
Moonrise 7:04 AM
Transit 11:49 AM
Moonset 4:29 PM

Best Times for Fishing or Hunting

Major Periods

11:19 AM - 1:49 PM
11:44 PM - 2:14 AM

Minor Periods

6:34 AM - 8:04 AM
3:59 PM - 5:29 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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