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

61.8°F
Clear
Conditions: Clear
Humidity: 79%
Feels Like: 55.8°F
Wind: SW 13.9 mph
Wind Gusts: 28.4 mph
Pressure: 29.83 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 0

Weather Forecast

Sunny
Thu
H: 72°F
L: 62°F
Sunny
Fri
H: 69°F
L: 59°F
Overcast
Sat
H: 67°F
L: 59°F
Overcast
Sun
H: 67°F
L: 62°F
Patchy rain nearby
Mon
H: 66°F
L: 61°F

Air Quality

AQI: 1 - Good
PM2.5: 6.1 μg/m3
PM10: 7.9 μg/m3
Carbon Monoxide: 123 μg/m3
Nitrogen Dioxide: 5.6 μg/m3
Sulphur Dioxide: 1.5 μg/m3
Ozone: 86 μg/m3

Astronomical

Sunrise: 6:56 AM
Sun Transit: 12:39 AM
Sunset: 6:23 PM
Daylight: 11 hrs 27 mins
Moonrise: 4:42 AM
Moon Transit: 11:05 AM
Moonset: 5:17 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

12:32 AM - 3:02 AM
10:35 AM - 1:05 PM

Minor Periods

4:47 PM - 6:17 PM
4:12 AM - 5:42 AM

Action Rating: 3 out of 5

Small Craft Advisory issued October 7 at 2:28PM EDT until October 8 at 2:00PM EDT by NWS Upton NY

Effective: Wed October 7, 2026, 2:28 PM
Expires: Thu October 8, 2026, 3:30 AM

* WHAT...Southwest winds 15 to 20 kt with gusts up to 25 kt and seas 3 to 5 feet expected. * WHERE...Fire Island Inlet NY to Montauk Point NY out 20 nm. * WHEN...From 2 AM to 2 PM EDT Thursday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Thursday, October 8, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 65.9°F
Average Humidity: 58%
Chance of Rain: 3%
Wind: 15.2 mph
UV Index: 4.3

Air Quality

AQI: 1 - Good
PM2.5: 8.08 μg/m3
PM10: 9.02 μg/m3
Carbon Monoxide: 156.5 μg/m3
Nitrogen Dioxide: 13.52 μg/m3
Sulphur Dioxide: 1.81 μg/m3
Ozone: 78 μg/m3

Astronomical

Sunrise: 6:56 AM
Sun Transit: 12:39 AM
Sunset: 6:23 PM
Daylight: 11 hrs 27 mins
Moonrise: 4:42 AM
Moon Transit: 11:05 AM
Moonset: 5:17 PM
Moon Phase: Waning Crescent
Moon Illumination: 2.5%

Best Times for Fishing or Hunting

Major Periods

12:32 AM - 3:02 AM
10:35 AM - 1:05 PM

Minor Periods

4:47 PM - 6:17 PM
4:12 AM - 5:42 AM

Action Rating: 3 out of 5

Friday, October 9, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 63.6°F
Average Humidity: 46%
Chance of Rain: 3%
Wind: 13 mph
UV Index: 4.1

Air Quality

AQI: 1 - Good
PM2.5: 7.17 μg/m3
PM10: 7.48 μg/m3
Carbon Monoxide: 162.58 μg/m3
Nitrogen Dioxide: 19.43 μg/m3
Sulphur Dioxide: 1.81 μg/m3
Ozone: 52.92 μg/m3

Astronomical

Sunrise: 6:57 AM
Sun Transit: 12:39 AM
Sunset: 6:22 PM
Daylight: 11 hrs 24 mins
Moonrise: 5:50 AM
Moon Transit: 11:50 AM
Moonset: 5:39 PM
Moon Phase: Waning Crescent
Moon Illumination: 0.2%

Best Times for Fishing or Hunting

Major Periods

1:17 AM - 3:47 AM
11:20 AM - 1:50 PM

Minor Periods

5:09 PM - 6:39 PM
5:20 AM - 6:50 AM

Action Rating: 4 out of 5

Saturday, October 10, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 62.8°F
Average Humidity: 51%
Chance of Rain: 12%
Wind: 6.5 mph
UV Index: 3.7

Air Quality

AQI: 1 - Good
PM2.5: 7.39 μg/m3
PM10: 8.35 μg/m3
Carbon Monoxide: 142.63 μg/m3
Nitrogen Dioxide: 14.4 μg/m3
Sulphur Dioxide: 2.09 μg/m3
Ozone: 55.83 μg/m3

Astronomical

Sunrise: 6:58 AM
Sun Transit: 12:39 AM
Sunset: 6:20 PM
Daylight: 11 hrs 22 mins
Moonrise: 6:57 AM
Moon Transit: 12:34 AM
Moonset: 6:02 PM
Moon Phase: New
Moon Illumination: 0.5%

Best Times for Fishing or Hunting

Major Periods

2:01 AM - 4:31 AM
12:04 AM - 2:34 PM

Minor Periods

5:32 PM - 7:02 PM
6:27 AM - 7:57 AM

Action Rating: 3 out of 5

Sunday, October 11, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 64.1°F
Average Humidity: 72%
Chance of Rain: 84%
Wind: 13.6 mph
UV Index: 0.7

Air Quality

AQI: 1 - Good
PM2.5: 7.8 μg/m3
PM10: 11.66 μg/m3
Carbon Monoxide: 120.66 μg/m3
Nitrogen Dioxide: 5.65 μg/m3
Sulphur Dioxide: 1.14 μg/m3
Ozone: 69.21 μg/m3

Astronomical

Sunrise: 6:59 AM
Sun Transit: 12:39 AM
Sunset: 6:18 PM
Daylight: 11 hrs 19 mins
Moonrise: 8:04 AM
Moon Transit: 1:20 PM
Moonset: 6:28 PM
Moon Phase: New
Moon Illumination: 3.3%

Best Times for Fishing or Hunting

Major Periods

2:46 AM - 5:16 AM
12:50 AM - 3:20 PM

Minor Periods

5:58 PM - 7:28 PM
7:34 AM - 9:04 AM

Action Rating: 4 out of 5

Monday, October 12, 2026

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 63.5°F
Average Humidity: 92%
Chance of Rain: 90%
Wind: 14.1 mph
UV Index: 4

Air Quality

AQI: 1 - Good
PM2.5: 6.07 μg/m3
PM10: 9.77 μg/m3
Carbon Monoxide: 142 μg/m3
Nitrogen Dioxide: 2.13 μg/m3
Sulphur Dioxide: 0.49 μg/m3
Ozone: 78.33 μg/m3

Astronomical

Sunrise: 7:00 AM
Sun Transit: 12:38 AM
Sunset: 6:17 PM
Daylight: 11 hrs 16 mins
Moonrise: 9:11 AM
Moon Transit: 2:07 PM
Moonset: 6:56 PM
Moon Phase: New
Moon Illumination: 0.8%

Best Times for Fishing or Hunting

Major Periods

3:33 AM - 6:03 AM
1:37 PM - 4:07 PM

Minor Periods

6:26 PM - 7:56 PM
8:41 AM - 10:11 AM

Action Rating: 4 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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