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

64.9°F
Clear
Clear
64.9°F
64.8°F
84%
ENE 5.1 mph
8.9 mph
64.8°F
60°F
0 in
0%
9 mi
1018 mbar
0

Five Day Weather Forecast

Sunny
Sun
H: 89°F
L: 64°F
Sunny
Mon
H: 78°F
L: 69°F
Sunny
Tue
H: 85°F
L: 70°F
Sunny
Wed
H: 91°F
L: 76°F
Sunny
Thu
H: 85°F
L: 67°F

Air Quality

AQI: 1 - Good
PM2.5: 9.6 μg/m3
PM10: 12.4 μg/m3
Carbon Monoxide: 179 μg/m3
Nitrogen Dioxide: 5.2 μg/m3
Sulphur Dioxide: 0.8 μg/m3
Ozone: 63 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 12:58 AM
Sunset: 8:24 PM
Daylight: 14 hrs 53 mins
Moonrise: 2:59 AM
Moon Transit: 11:08 AM
Moonset: 7:18 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:26 AM - 2:56 AM
10:38 AM - 1:08 PM

Minor Periods

6:48 PM - 8:18 PM
2:29 AM - 3:59 AM

Action Rating: 3 out of 5

Coastal Flood Statement issued July 11 at 3:36PM EDT until July 11 at 8:00PM EDT by NWS Upton NY

Effective: Sat July 11, 2026, 3:36 PM
Expires: Sat July 11, 2026, 11:45 PM

* WHAT...Up to one half foot of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...Southern Nassau County. * WHEN...For the first Coastal Flood Statement, until 8 PM EDT this evening. For the second Coastal Flood Statement, from Sunday afternoon through Sunday evening. * IMPACTS...Brief minor flooding of the more vulnerable locations near the waterfront and shoreline. * ADDITIONAL DETAILS...Brief minor flooding may also occur around the time of high tide early Monday evening.

Do not drive through flooded roadways.


Coastal Flood Statement issued July 11 at 3:36PM EDT until July 12 at 9:00PM EDT by NWS Upton NY

Effective: Sat July 11, 2026, 3:36 PM
Expires: Sat July 11, 2026, 11:45 PM

* WHAT...Up to one half foot of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...Southern Nassau County. * WHEN...For the first Coastal Flood Statement, until 8 PM EDT this evening. For the second Coastal Flood Statement, from Sunday afternoon through Sunday evening. * IMPACTS...Brief minor flooding of the more vulnerable locations near the waterfront and shoreline. * ADDITIONAL DETAILS...Brief minor flooding may also occur around the time of high tide early Monday evening.

Do not drive through flooded roadways.
Sunday, July 12, 2026

Weather Forecast

Sunny
89.1°F
64°F
73°F
65%
0 in
5%
0%
10.7 mph
8.5


Air Quality

AQI: 1 - Good
PM2.5: 9.81 μg/m3
PM10: 11.95 μg/m3
Carbon Monoxide: 157.58 μg/m3
Nitrogen Dioxide: 4.97 μg/m3
Sulphur Dioxide: 0.85 μg/m3
Ozone: 87.71 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 12:58 AM
Sunset: 8:24 PM
Daylight: 14 hrs 53 mins
Moonrise: 2:59 AM
Moon Transit: 11:08 AM
Moonset: 7:18 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

12:26 AM - 2:56 AM
10:38 AM - 1:08 PM

Minor Periods

6:48 PM - 8:18 PM
2:29 AM - 3:59 AM

Action Rating: 3 out of 5

Monday, July 13, 2026

Weather Forecast

Sunny
77.8°F
68.9°F
73.3°F
62%
0 in
5%
0%
11.6 mph
8.4


Air Quality

AQI: 1 - Good
PM2.5: 12.31 μg/m3
PM10: 15.78 μg/m3
Carbon Monoxide: 125.33 μg/m3
Nitrogen Dioxide: 10.85 μg/m3
Sulphur Dioxide: 1.45 μg/m3
Ozone: 77.21 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 12:58 AM
Sunset: 8:24 PM
Daylight: 14 hrs 51 mins
Moonrise: 4:08 AM
Moon Transit: 12:15 AM
Moonset: 8:15 PM
Moon Phase: New
Moon Illumination: 0.1%

Best Times for Fishing or Hunting

Major Periods

1:33 AM - 4:03 AM
11:45 AM - 2:15 PM

Minor Periods

7:45 PM - 9:15 PM
3:38 AM - 5:08 AM

Action Rating: 4 out of 5

Tuesday, July 14, 2026

Weather Forecast

Sunny
85.1°F
70.2°F
77°F
61%
0 in
4%
0%
17.2 mph
9.3


Air Quality

AQI: 1 - Good
PM2.5: 13.67 μg/m3
PM10: 16.73 μg/m3
Carbon Monoxide: 141.33 μg/m3
Nitrogen Dioxide: 10.75 μg/m3
Sulphur Dioxide: 1.75 μg/m3
Ozone: 98.08 μg/m3

Astronomical

Sunrise: 5:33 AM
Sun Transit: 12:58 AM
Sunset: 8:23 PM
Daylight: 14 hrs 50 mins
Moonrise: 5:26 AM
Moon Transit: 1:19 PM
Moonset: 9:00 PM
Moon Phase: New
Moon Illumination: 1.9%

Best Times for Fishing or Hunting

Major Periods

2:39 AM - 5:09 AM
12:49 AM - 3:19 PM

Minor Periods

8:30 PM - 10:00 PM
4:56 AM - 6:26 AM

Action Rating: 5 out of 5

Wednesday, July 15, 2026

Weather Forecast

Sunny
90.5°F
76.1°F
83.7°F
53%
0 in
3%
0%
16.3 mph
9.5


Air Quality

AQI: 1 - Good
PM2.5: 13.52 μg/m3
PM10: 14.7 μg/m3
Carbon Monoxide: 162.28 μg/m3
Nitrogen Dioxide: 11.45 μg/m3
Sulphur Dioxide: 2.17 μg/m3
Ozone: 125.79 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
85.1°F
66.7°F
78.1°F
54%
0.18 in
57%
0%
14.5 mph
7


Air Quality

AQI: 1 - Good
PM2.5: 7.62 μg/m3
PM10: 7.64 μg/m3
Carbon Monoxide: 186.78 μg/m3
Nitrogen Dioxide: 12.68 μg/m3
Sulphur Dioxide: 1.18 μg/m3
Ozone: 67.44 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

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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