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

69.1°F
Clear
Clear
69.1°F
67.1°F
78%
SSW 6 mph
11 mph
67.1°F
62.4°F
0 in
0%
9 mi
1020 mbar
0

Five Day Weather Forecast

Sunny
Tue
H: 91°F
L: 65°F
Sunny
Wed
H: 84°F
L: 73°F
Sunny
Thu
H: 93°F
L: 75°F
Sunny
Fri
H: 93°F
L: 78°F
Sunny
Sat
H: 88°F
L: 76°F

Air Quality

AQI: 1 - Good
PM2.5: 9.4 μg/m3
PM10: 11.4 μg/m3
Carbon Monoxide: 124 μg/m3
Nitrogen Dioxide: 13.4 μg/m3
Sulphur Dioxide: 1 μg/m3
Ozone: 81 μg/m3

Astronomical

Sunrise: 5:24 AM
Sun Transit: 12:56 AM
Sunset: 8:28 PM
Daylight: 15 hrs 4 mins
Moonrise: 9:24 PM
Moon Transit: 1:07 AM
Moonset: 5:34 AM
Moon Phase: Full
Moon Illumination: 98.6%

Best Times for Fishing or Hunting

Major Periods

12:37 AM - 3:07 AM
3:22 PM - 5:52 PM

Minor Periods

8:54 PM - 10:24 PM
5:04 AM - 6:34 AM

Action Rating: 5 out of 5

Small Craft Advisory issued June 29 at 2:56PM EDT until July 1 at 12:00AM EDT by NWS Upton NY

Effective: Mon June 29, 2026, 2:56 PM
Expires: Tue June 30, 2026, 8:30 AM

* WHAT...South winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 feet expected on ocean waters west of Fire island Inlet and 2 to 3 feet on western Long Island Sound. * WHERE...Long Island Sound west of Port Jefferson and New Haven, New York Harbor, South Shore Bays from Jones Inlet through Shinnecock Bay, and Sandy Hook NJ to Fire Island Inlet NY out 20 NM. * WHEN...From 2 PM Tuesday to midnight EDT Tuesday night. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Tuesday, June 30, 2026

Weather Forecast

Sunny
90.5°F
64.6°F
75.1°F
65%
0 in
5%
0%
15 mph
9.5


Air Quality

AQI: 1 - Good
PM2.5: 11.77 μg/m3
PM10: 13.44 μg/m3
Carbon Monoxide: 133.54 μg/m3
Nitrogen Dioxide: 11.19 μg/m3
Sulphur Dioxide: 1.38 μg/m3
Ozone: 97.29 μg/m3

Astronomical

Sunrise: 5:24 AM
Sun Transit: 12:56 AM
Sunset: 8:28 PM
Daylight: 15 hrs 4 mins
Moonrise: 9:24 PM
Moon Transit: 1:07 AM
Moonset: 5:34 AM
Moon Phase: Full
Moon Illumination: 98.6%

Best Times for Fishing or Hunting

Major Periods

12:37 AM - 3:07 AM
3:22 PM - 5:52 PM

Minor Periods

8:54 PM - 10:24 PM
5:04 AM - 6:34 AM

Action Rating: 5 out of 5

Wednesday, July 1, 2026

Weather Forecast

Sunny
84.1°F
73.1°F
77.7°F
63%
0 in
5%
0%
18.6 mph
9.7


Air Quality

AQI: 1 - Good
PM2.5: 13.16 μg/m3
PM10: 16.14 μg/m3
Carbon Monoxide: 111.96 μg/m3
Nitrogen Dioxide: 6.98 μg/m3
Sulphur Dioxide: 1.08 μg/m3
Ozone: 99.25 μg/m3

Astronomical

Sunrise: 5:25 AM
Sun Transit: 12:56 AM
Sunset: 8:28 PM
Daylight: 15 hrs 3 mins
Moonrise: 9:57 PM
Moon Transit: 1:57 AM
Moonset: 6:36 AM
Moon Phase: Full
Moon Illumination: 94.7%

Best Times for Fishing or Hunting

Major Periods

1:27 AM - 3:57 AM
4:11 PM - 6:41 PM

Minor Periods

9:27 PM - 10:57 PM
6:06 AM - 7:36 AM

Action Rating: 3 out of 5

Thursday, July 2, 2026

Weather Forecast

Sunny
92.7°F
75.2°F
83.4°F
63%
0 in
4%
0%
12.8 mph
9.6


Air Quality

AQI: 2 - Moderate
PM2.5: 16.24 μg/m3
PM10: 19.9 μg/m3
Carbon Monoxide: 139.88 μg/m3
Nitrogen Dioxide: 10.61 μg/m3
Sulphur Dioxide: 1.57 μg/m3
Ozone: 112.38 μg/m3

Astronomical

Sunrise: 5:25 AM
Sun Transit: 12:56 AM
Sunset: 8:28 PM
Daylight: 15 hrs 2 mins
Moonrise: 10:25 PM
Moon Transit: 2:45 AM
Moonset: 7:40 AM
Moon Phase: Waning Gibbous
Moon Illumination: 88.5%

Best Times for Fishing or Hunting

Major Periods

2:15 AM - 4:45 AM
4:57 PM - 7:27 PM

Minor Periods

9:55 PM - 11:25 PM
7:10 AM - 8:40 AM

Action Rating: 2 out of 5

Friday, July 3, 2026

Weather Forecast

Sunny
93.4°F
77.8°F
85°F
59%
0.07 in
57%
0%
23.5 mph
10.1


Air Quality

AQI: 2 - Moderate
PM2.5: 16.67 μg/m3
PM10: 19.67 μg/m3
Carbon Monoxide: 165.98 μg/m3
Nitrogen Dioxide: 14.24 μg/m3
Sulphur Dioxide: 1.58 μg/m3
Ozone: 116.63 μg/m3

Astronomical

Sunrise: 5:26 AM
Sun Transit: 12:56 AM
Sunset: 8:27 PM
Daylight: 15 hrs 2 mins
Moonrise: 10:50 PM
Moon Transit: 3:30 AM
Moonset: 8:45 AM
Moon Phase: Waning Gibbous
Moon Illumination: 80.3%

Best Times for Fishing or Hunting

Major Periods

3:00 AM - 5:30 AM
5:42 PM - 8:12 PM

Minor Periods

10:20 PM - 11:50 PM
8:15 AM - 9:45 AM

Action Rating: 4 out of 5

Saturday, July 4, 2026

Weather Forecast

Sunny
87.6°F
75.8°F
81.1°F
65%
0.07 in
57%
0%
13.9 mph
8


Air Quality

AQI: 1 - Good
PM2.5: 15.06 μg/m3
PM10: 16.47 μg/m3
Carbon Monoxide: 255.56 μg/m3
Nitrogen Dioxide: 25.24 μg/m3
Sulphur Dioxide: 1.53 μg/m3
Ozone: 56.89 μg/m3

Astronomical

Sunrise: 5:26 AM
Sun Transit: 12:56 AM
Sunset: 8:27 PM
Daylight: 15 hrs 1 mins
Moonrise: 11:11 PM
Moon Transit: 4:14 AM
Moonset: 9:49 AM
Moon Phase: Waning Gibbous
Moon Illumination: 70.6%

Best Times for Fishing or Hunting

Major Periods

3:44 AM - 6:14 AM
6:25 PM - 8:55 PM

Minor Periods

12:00 AM - 12:00 AM
9:19 AM - 10:49 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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