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

73.9°F
Overcast
Overcast
77.6°F
76.6°F
82%
SSE 12.1 mph
16.7 mph
72.5°F
66.8°F
0 in
100%
9 mi
1013 mbar
0.9

Five Day Weather Forecast

Sunny
Tue
H: 77°F
L: 65°F
Partly Cloudy
Wed
H: 82°F
L: 71°F
Sunny
Thu
H: 77°F
L: 65°F
Sunny
Fri
H: 77°F
L: 65°F
Sunny
Sat
H: 78°F
L: 65°F

Air Quality

AQI: 1 - Good
PM2.5: 15.3 μg/m3
PM10: 20.6 μg/m3
Carbon Monoxide: 135 μg/m3
Nitrogen Dioxide: 3 μg/m3
Sulphur Dioxide: 0.6 μg/m3
Ozone: 102 μg/m3

Astronomical

Sunrise: 5:39 AM
Sun Transit: 12:58 AM
Sunset: 8:18 PM
Daylight: 14 hrs 39 mins
Moonrise: 1:47 PM
Moon Transit: 6:56 PM
Moonset: 12:33 AM
Moon Phase: First Quarter
Moon Illumination: 43.7%

Best Times for Fishing or Hunting

Major Periods

8:23 AM - 10:53 AM
6:26 PM - 8:56 PM

Minor Periods

1:17 PM - 2:47 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Small Craft Advisory issued July 20 at 2:33PM EDT until July 22 at 6:00PM EDT by NWS Upton NY

Effective: Mon July 20, 2026, 2:33 PM
Expires: Tue July 21, 2026, 6:00 AM

* WHAT...South winds 10 to 20 kt with gusts up to 30 kt. * WHERE...The Long Island south shore bays. * WHEN...From 8 AM Tuesday to 6 PM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.


Small Craft Advisory issued July 21 at 2:48AM EDT until July 22 at 6:00PM EDT by NWS Upton NY

Effective: Tue July 21, 2026, 2:48 AM
Expires: Tue July 21, 2026, 6:00 PM

* WHAT...South winds 15 to 20 kt with gusts up to 25 kt. * WHERE...The Long Island south shore bays. * WHEN...From 8 AM this morning to 6 PM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Tuesday, July 21, 2026

Weather Forecast

Sunny
77.2°F
65.1°F
71.2°F
87%
1.1 in
81%
0%
16.3 mph
7.7


Air Quality

AQI: 1 - Good
PM2.5: 12.73 μg/m3
PM10: 16.69 μg/m3
Carbon Monoxide: 136.92 μg/m3
Nitrogen Dioxide: 3.1 μg/m3
Sulphur Dioxide: 0.64 μg/m3
Ozone: 103.33 μg/m3

Astronomical

Sunrise: 5:39 AM
Sun Transit: 12:58 AM
Sunset: 8:18 PM
Daylight: 14 hrs 39 mins
Moonrise: 1:47 PM
Moon Transit: 6:56 PM
Moonset: 12:33 AM
Moon Phase: First Quarter
Moon Illumination: 43.7%

Best Times for Fishing or Hunting

Major Periods

8:23 AM - 10:53 AM
6:26 PM - 8:56 PM

Minor Periods

1:17 PM - 2:47 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, July 22, 2026

Weather Forecast

Partly Cloudy
82°F
71.3°F
76.2°F
79%
0.08 in
62%
0%
14.3 mph
7.9


Air Quality

AQI: 1 - Good
PM2.5: 9.06 μg/m3
PM10: 9.78 μg/m3
Carbon Monoxide: 150.33 μg/m3
Nitrogen Dioxide: 8.1 μg/m3
Sulphur Dioxide: 1.32 μg/m3
Ozone: 104.75 μg/m3

Astronomical

Sunrise: 5:40 AM
Sun Transit: 12:58 AM
Sunset: 8:18 PM
Daylight: 14 hrs 38 mins
Moonrise: 2:52 PM
Moon Transit: 7:42 PM
Moonset: 12:58 AM
Moon Phase: First Quarter
Moon Illumination: 55.0%

Best Times for Fishing or Hunting

Major Periods

9:08 AM - 11:38 AM
7:12 PM - 9:42 PM

Minor Periods

2:22 PM - 3:52 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, July 23, 2026

Weather Forecast

Sunny
76.8°F
64.8°F
70.8°F
54%
0 in
3%
0%
13 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 4.33 μg/m3
PM10: 4.38 μg/m3
Carbon Monoxide: 146.29 μg/m3
Nitrogen Dioxide: 6.17 μg/m3
Sulphur Dioxide: 0.89 μg/m3
Ozone: 71.92 μg/m3

Astronomical

Sunrise: 5:41 AM
Sun Transit: 12:58 AM
Sunset: 8:17 PM
Daylight: 14 hrs 36 mins
Moonrise: 3:55 PM
Moon Transit: 8:30 PM
Moonset: 12:27 AM
Moon Phase: First Quarter
Moon Illumination: 66.1%

Best Times for Fishing or Hunting

Major Periods

9:55 AM - 12:25 AM
8:00 PM - 10:30 PM

Minor Periods

3:25 PM - 4:55 PM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Friday, July 24, 2026

Weather Forecast

Sunny
77.2°F
65°F
71.4°F
51%
0 in
3%
0%
9.4 mph
8.5


Air Quality

AQI: 1 - Good
PM2.5: 7.66 μg/m3
PM10: 8.43 μg/m3
Carbon Monoxide: 135.28 μg/m3
Nitrogen Dioxide: 9.18 μg/m3
Sulphur Dioxide: 0.72 μg/m3
Ozone: 74.08 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 12:58 AM
Sunset: 8:16 PM
Daylight: 14 hrs 34 mins
Moonrise: 4:56 PM
Moon Transit: 9:20 PM
Moonset: 1:01 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 76.3%

Best Times for Fishing or Hunting

Major Periods

10:44 AM - 1:14 PM
8:50 PM - 11:20 PM

Minor Periods

4:26 PM - 5:56 PM
12:31 AM - 2:01 AM

Action Rating: 2 out of 5

Saturday, July 25, 2026

Weather Forecast

Sunny
78°F
64.5°F
71.9°F
59%
0 in
4%
0%
12.3 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 7.08 μg/m3
PM10: 9.16 μg/m3
Carbon Monoxide: 166.11 μg/m3
Nitrogen Dioxide: 5.81 μg/m3
Sulphur Dioxide: 0.62 μg/m3
Ozone: 72.78 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 12:58 AM
Sunset: 8:15 PM
Daylight: 14 hrs 32 mins
Moonrise: 5:52 PM
Moon Transit: 10:11 PM
Moonset: 1:41 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 85.2%

Best Times for Fishing or Hunting

Major Periods

11:35 AM - 2:05 PM
12:00 AM - 12:00 AM

Minor Periods

5:22 PM - 6:52 PM
1:11 AM - 2:41 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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