Water Temperature of Great South Bay in West Sayville, NY

Current Water Temperature

35.8°F

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

25.4°F
Clear with periodic clouds
Conditions: Clear with periodic clouds
Humidity: 48%
Heat Index: 25.4°F
Feels Like: 14.2°F
Wind: NNW 9.3 mph
Wind Gusts: 21 mph
Wind Chill: 14.2°F
Air Pressure: 1021.87 millibars
Dew Point: 14.2°F
Chance of Precipitation: 0%
Precipitation: 0 in
Cloud Cover: 25%
Visibility: 10 mi
UV Index: 0

Five Day Weather Forecast

Moderate or heavy snow showers
Fri
H: 25°F
L: 18°F
Moderate or heavy snow showers
Sat
H: 33°F
L: 25°F
Partly Cloudy
Sun
H: 35°F
L: 27°F
Moderate rain
Mon
H: 50°F
L: 37°F
Overcast
Tue
H: 31°F
L: 29°F

Air Quality

PM2.5: 2.05 μg/m3
PM10: 2.15 μg/m3
Carbon Monoxide: 161.85 μg/m3
Nitrogen Dioxide: 5.45 μg/m3
Sulphur Dioxide: 2.45 μg/m3
Ozone: 74 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 11:53 AM
Sunset: 4:31 PM
Daylight: 9 hrs 17 mins
Moonrise: 11:07 AM
Moon Transit: 12:00 AM
Moonset: 11:19 PM
Moon Phase: First Quarter
Moon Illumination: 40.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

12:00 AM - 12:00 AM
10:37 AM - 12:07 AM

Action Rating: 2 out of 5

Winter Storm Warning issued December 25 at 1:19PM EST until December 27 at 1:00PM EST by NWS Upton NY

Effective: Thu December 25, 2025, 1:19 PM
Expires: Fri December 26, 2025, 4:00 AM

* WHAT...Heavy snow expected. Total snow accumulations between 4 and 8 inches. * WHERE...Portions of southern Connecticut, northeast New Jersey, and southeast New York. * WHEN...From 4 PM Friday to 1 PM EST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday evening commute.

If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Check local Department of Transportation information services for the latest road conditions.


Winter Storm Warning issued December 25 at 1:19PM EST until December 27 at 1:00PM EST by NWS Upton NY

Effective: Thu December 25, 2025, 1:19 PM
Expires: Fri December 26, 2025, 4:00 AM

* WHAT...Heavy snow expected. Total snow accumulations between 4 and 8 inches. Highest amounts are expected from near Riverhead on westward. The north and south forks will likely see a sharper gradient with amounts 2 to 5 inches. * WHERE...Northeast Suffolk and Southeast Suffolk Counties. * WHEN...From 7 PM Friday to 1 PM EST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday evening commute.

If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Check local Department of Transportation information services for the latest road conditions.
Friday, December 26, 2025

Weather Forecast

Conditions: Moderate or heavy snow showers
Average Temperature: 22.9°F
Average Humidity: 58%
Chance of Rain: 61%
Wind: 17 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 3.04 μg/m3
PM10: 3.13 μg/m3
Carbon Monoxide: 176.13 μg/m3
Nitrogen Dioxide: 8.31 μg/m3
Sulphur Dioxide: 2.73 μg/m3
Ozone: 70.44 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 11:53 AM
Sunset: 4:31 PM
Daylight: 9 hrs 17 mins
Moonrise: 11:07 AM
Moon Transit: 12:00 AM
Moonset: 11:19 PM
Moon Phase: First Quarter
Moon Illumination: 40.5%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

12:00 AM - 12:00 AM
10:37 AM - 12:07 AM

Action Rating: 2 out of 5

Saturday, December 27, 2025

Weather Forecast

Conditions: Moderate or heavy snow showers
Average Temperature: 29.1°F
Average Humidity: 87%
Chance of Rain: 63%
Wind: 15.9 mph
UV Index: 0.2

Air Quality

AQI: 1 - Good
PM2.5: 5.46 μg/m3
PM10: 6.05 μg/m3
Carbon Monoxide: 192.93 μg/m3
Nitrogen Dioxide: 11.42 μg/m3
Sulphur Dioxide: 2.53 μg/m3
Ozone: 64.4 μg/m3

Astronomical

Sunrise: 7:15 AM
Sun Transit: 11:53 AM
Sunset: 4:32 PM
Daylight: 9 hrs 17 mins
Moonrise: 11:28 AM
Moon Transit: 4:23 AM
Moonset: 12:19 AM
Moon Phase: First Quarter
Moon Illumination: 51.8%

Best Times for Fishing or Hunting

Major Periods

3:53 AM - 6:23 AM
3:53 AM - 6:23 AM

Minor Periods

10:58 AM - 12:28 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Sunday, December 28, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 31°F
Average Humidity: 87%
Chance of Rain: 0%
Wind: 12.3 mph
UV Index: 0.3

Air Quality

AQI: 1 - Good
PM2.5: 11.92 μg/m3
PM10: 13.53 μg/m3
Carbon Monoxide: 220.69 μg/m3
Nitrogen Dioxide: 22.49 μg/m3
Sulphur Dioxide: 2.57 μg/m3
Ozone: 51.56 μg/m3

Astronomical

Sunrise: 7:16 AM
Sun Transit: 11:54 AM
Sunset: 4:33 PM
Daylight: 9 hrs 17 mins
Moonrise: 11:52 AM
Moon Transit: 6:40 PM
Moonset: 12:30 AM
Moon Phase: First Quarter
Moon Illumination: 63.0%

Best Times for Fishing or Hunting

Major Periods

8:06 AM - 10:36 AM
6:10 PM - 8:40 PM

Minor Periods

11:22 AM - 12:52 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Monday, December 29, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 44°F
Average Humidity: 90%
Chance of Rain: 81%
Wind: 26.2 mph
UV Index: 0.1

Air Quality

AQI: 1 - Good
PM2.5: 10.66 μg/m3
PM10: 14.08 μg/m3
Carbon Monoxide: 162.77 μg/m3
Nitrogen Dioxide: 8.62 μg/m3
Sulphur Dioxide: 2.54 μg/m3
Ozone: 64.85 μg/m3

Astronomical

Sunrise: 7:16 AM
Sun Transit: 11:54 AM
Sunset: 4:34 PM
Daylight: 9 hrs 18 mins
Moonrise: 12:19 AM
Moon Transit: 7:32 PM
Moonset: 1:43 AM
Moon Phase: First Quarter
Moon Illumination: 73.5%

Best Times for Fishing or Hunting

Major Periods

8:56 AM - 11:26 AM
7:02 PM - 9:32 PM

Minor Periods

11:49 AM - 1:19 PM
1:13 AM - 2:43 AM

Action Rating: 2 out of 5

Tuesday, December 30, 2025

Weather Forecast

Conditions: Overcast
Average Temperature: 31°F
Average Humidity: 54%
Chance of Rain: 0%
Wind: 25.7 mph
UV Index: 0

Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 7:16 AM
Sun Transit: 11:55 AM
Sunset: 4:34 PM
Daylight: 9 hrs 18 mins
Moonrise: 12:52 AM
Moon Transit: 8:29 PM
Moonset: 3:00 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 82.8%

Best Times for Fishing or Hunting

Major Periods

9:50 AM - 12:20 AM
7:59 PM - 10:29 PM

Minor Periods

12:22 AM - 1:52 PM
2:30 AM - 4:00 AM

Action Rating: 2 out of 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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