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
Clear
Clear
60.8°F
78.9°F
84%
WSW 12.8 mph
22.6 mph
75.2°F
70.1°F
0 in
0%
6 mi
1011 mbar
0

Five Day Weather Forecast

Sunny
Wed
H: 101°F
L: 74°F
Sunny
Thu
H: 90°F
L: 76°F
Sunny
Fri
H: 82°F
L: 72°F
Light rain
Sat
H: 74°F
L: 67°F
Partly Cloudy
Sun
H: 74°F
L: 68°F

Air Quality

AQI: 1 - Good
PM2.5: 19.2 μg/m3
PM10: 20.1 μg/m3
Carbon Monoxide: 168 μg/m3
Nitrogen Dioxide: 10.8 μg/m3
Sulphur Dioxide: 2.5 μg/m3
Ozone: 89 μg/m3

Astronomical

Sunrise: 5:34 AM
Sun Transit: 12:58 AM
Sunset: 8:23 PM
Daylight: 14 hrs 49 mins
Moonrise: 6:47 AM
Moon Transit: 2:18 PM
Moonset: 9:34 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

3:40 AM - 6:10 AM
1:48 PM - 4:18 PM

Minor Periods

9:04 PM - 10:34 PM
6:17 AM - 7:47 AM

Action Rating: 3 out of 5

Small Craft Advisory issued July 14 at 2:25PM EDT until July 15 at 2:00PM EDT by NWS Upton NY

Effective: Tue July 14, 2026, 2:25 PM
Expires: Wed July 15, 2026, 3:30 AM

* WHAT...Southwest winds 15 to 25 kt with gusts up to 30 kt and seas 4 to 7 feet expected. * WHERE...Fire Island Inlet NY to Montauk Point NY out 20 nm. * WHEN...Until 2 PM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Wednesday, July 15, 2026

Weather Forecast

Sunny
101.3°F
73.6°F
85.5°F
58%
0 in
5%
0%
15.4 mph
7.3


Air Quality

AQI: 1 - Good
PM2.5: 15.43 μg/m3
PM10: 16.05 μg/m3
Carbon Monoxide: 146.46 μg/m3
Nitrogen Dioxide: 8.97 μg/m3
Sulphur Dioxide: 1.76 μg/m3
Ozone: 114.42 μg/m3

Astronomical

Sunrise: 5:34 AM
Sun Transit: 12:58 AM
Sunset: 8:23 PM
Daylight: 14 hrs 49 mins
Moonrise: 6:47 AM
Moon Transit: 2:18 PM
Moonset: 9:34 PM
Moon Phase: New
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

3:40 AM - 6:10 AM
1:48 PM - 4:18 PM

Minor Periods

9:04 PM - 10:34 PM
6:17 AM - 7:47 AM

Action Rating: 3 out of 5

Thursday, July 16, 2026

Weather Forecast

Sunny
90.1°F
76.4°F
83.7°F
44%
0 in
2%
0%
11.9 mph
6.9


Air Quality

AQI: 2 - Moderate
PM2.5: 16.51 μg/m3
PM10: 17.59 μg/m3
Carbon Monoxide: 152.63 μg/m3
Nitrogen Dioxide: 11.23 μg/m3
Sulphur Dioxide: 1.4 μg/m3
Ozone: 103.42 μg/m3

Astronomical

Sunrise: 5:35 AM
Sun Transit: 12:58 AM
Sunset: 8:22 PM
Daylight: 14 hrs 47 mins
Moonrise: 8:06 AM
Moon Transit: 3:11 PM
Moonset: 10:03 PM
Moon Phase: New
Moon Illumination: 2.4%

Best Times for Fishing or Hunting

Major Periods

4:35 AM - 7:05 AM
2:41 PM - 5:11 PM

Minor Periods

9:33 PM - 11:03 PM
7:36 AM - 9:06 AM

Action Rating: 3 out of 5

Friday, July 17, 2026

Weather Forecast

Sunny
81.9°F
71.7°F
77.6°F
51%
0 in
3%
0%
9.4 mph
7.8


Air Quality

AQI: 1 - Good
PM2.5: 9.68 μg/m3
PM10: 11.04 μg/m3
Carbon Monoxide: 152.96 μg/m3
Nitrogen Dioxide: 6.29 μg/m3
Sulphur Dioxide: 0.92 μg/m3
Ozone: 94.13 μg/m3

Astronomical

Sunrise: 5:35 AM
Sun Transit: 12:58 AM
Sunset: 8:21 PM
Daylight: 14 hrs 46 mins
Moonrise: 9:20 AM
Moon Transit: 4:00 PM
Moonset: 10:27 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.0%

Best Times for Fishing or Hunting

Major Periods

5:25 AM - 7:55 AM
3:30 PM - 6:00 PM

Minor Periods

9:57 PM - 11:27 PM
8:50 AM - 10:20 AM

Action Rating: 3 out of 5

Saturday, July 18, 2026

Weather Forecast

Light rain
74.2°F
66.5°F
69.7°F
90%
0.74 in
89%
0%
11.6 mph
1.9


Air Quality

AQI: 1 - Good
PM2.5: 10.23 μg/m3
PM10: 13.51 μg/m3
Carbon Monoxide: 157.45 μg/m3
Nitrogen Dioxide: 6.17 μg/m3
Sulphur Dioxide: 0.88 μg/m3
Ozone: 93.83 μg/m3

Astronomical

Sunrise: 5:36 AM
Sun Transit: 12:58 AM
Sunset: 8:21 PM
Daylight: 14 hrs 44 mins
Moonrise: 10:30 AM
Moon Transit: 4:45 PM
Moonset: 10:50 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.9%

Best Times for Fishing or Hunting

Major Periods

6:12 AM - 8:42 AM
4:15 PM - 6:45 PM

Minor Periods

10:20 PM - 11:50 PM
10:00 AM - 11:30 AM

Action Rating: 2 out of 5

Sunday, July 19, 2026

Weather Forecast

Partly Cloudy
74.1°F
68°F
70.2°F
87%
0.02 in
50%
0%
8.1 mph
6


Air Quality

AQI: 1 - Good
PM2.5: 8.33 μg/m3
PM10: 8.87 μg/m3
Carbon Monoxide: 264.56 μg/m3
Nitrogen Dioxide: 11.21 μg/m3
Sulphur Dioxide: 1.56 μg/m3
Ozone: 79.56 μg/m3

Astronomical

Sunrise: 5:37 AM
Sun Transit: 12:58 AM
Sunset: 8:20 PM
Daylight: 14 hrs 43 mins
Moonrise: 11:37 AM
Moon Transit: 5:29 PM
Moonset: 11:11 PM
Moon Phase: Waxing Crescent
Moon Illumination: 22.6%

Best Times for Fishing or Hunting

Major Periods

6:56 AM - 9:26 AM
4:59 PM - 7:29 PM

Minor Periods

12:00 AM - 12:00 AM
11:07 AM - 12:37 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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