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

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

75.2°F
Partly cloudy
Partly cloudy
78°F
79.6°F
69%
S 6 mph
7.7 mph
77°F
64.7°F
0 in
25%
10 mi
1007 mbar
4.3

Five Day Weather Forecast

Sunny
Mon
H: 87°F
L: 62°F
Patchy rain nearby
Tue
H: 77°F
L: 67°F
Light rain shower
Wed
H: 77°F
L: 69°F
Light rain shower
Thu
H: 73°F
L: 66°F
Patchy rain nearby
Fri
H: 77°F
L: 65°F

Air Quality

AQI: 1 - Good
PM2.5: 17.8 μg/m3
PM10: 21.2 μg/m3
Carbon Monoxide: 142 μg/m3
Nitrogen Dioxide: 10.7 μg/m3
Sulphur Dioxide: 2.1 μg/m3
Ozone: 106 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 12:58 AM
Sunset: 8:13 PM
Daylight: 14 hrs 29 mins
Moonrise: 7:24 PM
Moon Transit: 11:53 PM
Moonset: 3:26 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.2%

Best Times for Fishing or Hunting

Major Periods

1:18 PM - 3:48 PM
12:00 AM - 12:00 AM

Minor Periods

6:54 PM - 8:24 PM
2:56 AM - 4:26 AM

Action Rating: 3 out of 5

Small Craft Advisory issued July 27 at 2:27AM EDT until July 29 at 6:00AM EDT by NWS Upton NY

Effective: Mon July 27, 2026, 2:27 AM
Expires: Mon July 27, 2026, 6:00 PM

* WHAT...Southeast winds 15 to 20 kt with gusts up to 30 kt and seas 5 to 6 feet expected. * WHERE...Sandy Hook NJ to Moriches Inlet NY out 20 nm. * WHEN...From noon Tuesday to 6 AM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Monday, July 27, 2026

Weather Forecast

Sunny
86.5°F
61.9°F
73.1°F
76%
0.02 in
36%
0%
11.4 mph
8.1


Air Quality

AQI: 2 - Moderate
PM2.5: 15.5 μg/m3
PM10: 18.45 μg/m3
Carbon Monoxide: 123.08 μg/m3
Nitrogen Dioxide: 7.88 μg/m3
Sulphur Dioxide: 1.36 μg/m3
Ozone: 114.5 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 12:58 AM
Sunset: 8:13 PM
Daylight: 14 hrs 29 mins
Moonrise: 7:24 PM
Moon Transit: 11:53 PM
Moonset: 3:26 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.2%

Best Times for Fishing or Hunting

Major Periods

1:18 PM - 3:48 PM
12:00 AM - 12:00 AM

Minor Periods

6:54 PM - 8:24 PM
2:56 AM - 4:26 AM

Action Rating: 3 out of 5

Tuesday, July 28, 2026

Weather Forecast

Patchy rain nearby
77.4°F
67.4°F
71.6°F
87%
0.64 in
85%
0%
12.1 mph
7.6


Air Quality

AQI: 1 - Good
PM2.5: 12.39 μg/m3
PM10: 15.64 μg/m3
Carbon Monoxide: 124.75 μg/m3
Nitrogen Dioxide: 3.75 μg/m3
Sulphur Dioxide: 0.77 μg/m3
Ozone: 107.42 μg/m3

Astronomical

Sunrise: 5:45 AM
Sun Transit: 12:58 AM
Sunset: 8:12 PM
Daylight: 14 hrs 27 mins
Moonrise: 7:59 PM
Moon Transit: 12:00 AM
Moonset: 4:27 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:07 PM - 4:37 PM

Minor Periods

7:29 PM - 8:59 PM
3:57 AM - 5:27 AM

Action Rating: 4 out of 5

Wednesday, July 29, 2026

Weather Forecast

Light rain shower
76.7°F
68.5°F
71.6°F
88%
0.44 in
87%
0%
13.9 mph
6.7


Air Quality

AQI: 1 - Good
PM2.5: 7.38 μg/m3
PM10: 7.84 μg/m3
Carbon Monoxide: 153.67 μg/m3
Nitrogen Dioxide: 8.72 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 101.71 μg/m3

Astronomical

Sunrise: 5:46 AM
Sun Transit: 12:58 AM
Sunset: 8:11 PM
Daylight: 14 hrs 25 mins
Moonrise: 8:29 PM
Moon Transit: 12:42 AM
Moonset: 5:31 AM
Moon Phase: Full
Moon Illumination: 99.7%

Best Times for Fishing or Hunting

Major Periods

12:12 AM - 2:42 AM
2:55 PM - 5:25 PM

Minor Periods

7:59 PM - 9:29 PM
5:01 AM - 6:31 AM

Action Rating: 4 out of 5

Thursday, July 30, 2026

Weather Forecast

Light rain shower
73.1°F
65.8°F
68.4°F
90%
1.18 in
89%
0%
18.1 mph
3.6


Air Quality

AQI: 1 - Good
PM2.5: 3.2 μg/m3
PM10: 3.25 μg/m3
Carbon Monoxide: 129.38 μg/m3
Nitrogen Dioxide: 6.16 μg/m3
Sulphur Dioxide: 0.97 μg/m3
Ozone: 73.33 μg/m3

Astronomical

Sunrise: 5:47 AM
Sun Transit: 12:58 AM
Sunset: 8:10 PM
Daylight: 14 hrs 23 mins
Moonrise: 8:54 PM
Moon Transit: 1:28 AM
Moonset: 6:37 AM
Moon Phase: Full
Moon Illumination: 97.1%

Best Times for Fishing or Hunting

Major Periods

12:58 AM - 3:28 AM
3:40 PM - 6:10 PM

Minor Periods

8:24 PM - 9:54 PM
6:07 AM - 7:37 AM

Action Rating: 5 out of 5

Friday, July 31, 2026

Weather Forecast

Patchy rain nearby
76.9°F
65.3°F
70.9°F
75%
0.01 in
25%
0%
8.5 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 4.59 μg/m3
PM10: 4.62 μg/m3
Carbon Monoxide: 187.22 μg/m3
Nitrogen Dioxide: 7.47 μg/m3
Sulphur Dioxide: 0.88 μg/m3
Ozone: 55.22 μg/m3

Astronomical

Sunrise: 5:48 AM
Sun Transit: 12:58 AM
Sunset: 8:09 PM
Daylight: 14 hrs 21 mins
Moonrise: 9:17 PM
Moon Transit: 2:13 AM
Moonset: 7:42 AM
Moon Phase: Full
Moon Illumination: 92.0%

Best Times for Fishing or Hunting

Major Periods

1:43 AM - 4:13 AM
4:24 PM - 6:54 PM

Minor Periods

8:47 PM - 10:17 PM
7:12 AM - 8:42 AM

Action Rating: 3 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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