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

12°F
Clear
Clear
-0.5°F
8°F
58%
NW 9.2 mph
16.1 mph
-3.5°F
-2.2°F
0 in
0%
9 mi
1016 mbar
0

Five Day Weather Forecast

Sunny
Thu
H: 23°F
L: 3°F
Sunny
Fri
H: 23°F
L: 8°F
Partly Cloudy
Sat
H: 19°F
L: 8°F
Blizzard
Sun
H: 24°F
L: 18°F
Sunny
Mon
H: 31°F
L: 15°F

Air Quality

AQI: 1 - Good
PM2.5: 11.65 μg/m3
PM10: 11.65 μg/m3
Carbon Monoxide: 246.85 μg/m3
Nitrogen Dioxide: 18.45 μg/m3
Sulphur Dioxide: 2.85 μg/m3
Ozone: 52 μg/m3

Astronomical

Sunrise: 7:05 AM
Sun Transit: 12:05 AM
Sunset: 5:06 PM
Daylight: 10 hrs 1 mins
Moonrise: 1:14 PM
Moon Transit: 9:25 PM
Moonset: 4:31 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.7%

Best Times for Fishing or Hunting

Major Periods

10:44 AM - 1:14 PM
8:55 PM - 11:25 PM

Minor Periods

12:44 AM - 2:14 PM
4:01 AM - 5:31 AM

Action Rating: 2 out of 5

Cold Weather Advisory issued January 29 at 12:51AM EST until January 30 at 10:00AM EST by NWS Upton NY

Effective: Thu January 29, 2026, 12:51 AM
Expires: Thu January 29, 2026, 9:15 AM

* WHAT...Very cold wind chills as low as 7 below expected. * WHERE...Northeast Suffolk, Northwest Suffolk, Southeast Suffolk, and Southwest Suffolk Counties. * WHEN...From midnight tonight to 10 AM EST Friday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves.


Cold Weather Advisory issued January 28 at 12:33PM EST until January 29 at 10:00AM EST by NWS Upton NY

Effective: Wed January 28, 2026, 12:33 PM
Expires: Thu January 29, 2026, 10:00 AM

* WHAT...Very cold wind chills as low as 10 below expected. * WHERE...Portions of northeast New Jersey and southeast New York. * WHEN...From 1 AM to 10 AM EST Thursday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves.


Cold Weather Advisory issued January 28 at 4:36PM EST until January 29 at 10:00AM EST by NWS Upton NY

Effective: Wed January 28, 2026, 4:36 PM
Expires: Thu January 29, 2026, 3:00 AM

* WHAT...Very cold wind chills as low as 10 below expected. * WHERE...Portions of northeast New Jersey and southeast New York. * WHEN...From 1 AM to 10 AM EST Thursday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Wear appropriate clothing, a hat, and gloves. Keep pets indoors as much as possible. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly. Do not use generators or grills inside.


Cold Weather Advisory issued January 29 at 12:51AM EST until January 30 at 10:00AM EST by NWS Upton NY

Effective: Thu January 29, 2026, 12:51 AM
Expires: Thu January 29, 2026, 9:15 AM

* WHAT...For the first Cold Weather Advisory, very cold wind chills as low as 5 below expected. For the second Cold Weather Advisory, very cold wind chills as low as 8 below expected. * WHERE...Northern Nassau and Southern Nassau Counties. * WHEN...For the first Cold Weather Advisory, until 10 AM EST this morning. For the second Cold Weather Advisory, from midnight tonight to 10 AM EST Friday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves.


Cold Weather Advisory issued January 29 at 12:51AM EST until January 29 at 10:00AM EST by NWS Upton NY

Effective: Thu January 29, 2026, 12:51 AM
Expires: Thu January 29, 2026, 9:15 AM

* WHAT...For the first Cold Weather Advisory, very cold wind chills as low as 5 below expected. For the second Cold Weather Advisory, very cold wind chills as low as 8 below expected. * WHERE...Northern Nassau and Southern Nassau Counties. * WHEN...For the first Cold Weather Advisory, until 10 AM EST this morning. For the second Cold Weather Advisory, from midnight tonight to 10 AM EST Friday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves.


Cold Weather Advisory issued January 29 at 12:51AM EST until January 30 at 10:00AM EST by NWS Upton NY

Effective: Thu January 29, 2026, 12:51 AM
Expires: Thu January 29, 2026, 9:15 AM

* WHAT...For the first Cold Weather Advisory, very cold wind chills as low as 6 below expected. For the second Cold Weather Advisory, very cold wind chills as low as 9 below expected. * WHERE...Bronx, Kings (Brooklyn), New York (Manhattan), Northern Queens, Richmond (Staten Island), and Southern Queens Counties. * WHEN...For the first Cold Weather Advisory, until 10 AM EST this morning. For the second Cold Weather Advisory, from midnight tonight to 10 AM EST Friday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves.


Cold Weather Advisory issued January 29 at 12:51AM EST until January 29 at 10:00AM EST by NWS Upton NY

Effective: Thu January 29, 2026, 12:51 AM
Expires: Thu January 29, 2026, 9:15 AM

* WHAT...For the first Cold Weather Advisory, very cold wind chills as low as 6 below expected. For the second Cold Weather Advisory, very cold wind chills as low as 9 below expected. * WHERE...Bronx, Kings (Brooklyn), New York (Manhattan), Northern Queens, Richmond (Staten Island), and Southern Queens Counties. * WHEN...For the first Cold Weather Advisory, until 10 AM EST this morning. For the second Cold Weather Advisory, from midnight tonight to 10 AM EST Friday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves.


Cold Weather Advisory issued January 29 at 12:51AM EST until January 30 at 10:00AM EST by NWS Upton NY

Effective: Thu January 29, 2026, 12:51 AM
Expires: Thu January 29, 2026, 9:15 AM

* WHAT...Very cold wind chills as low as 14 below expected. * WHERE...Northern Fairfield, Northern Middlesex, Northern New Haven, and Northern New London Counties. * WHEN...From midnight tonight to 10 AM EST Friday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. Keep pets indoors as much as possible. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly. Do not use generators or grills inside.


Cold Weather Advisory issued January 28 at 4:36PM EST until January 29 at 10:00AM EST by NWS Upton NY

Effective: Wed January 28, 2026, 4:36 PM
Expires: Thu January 29, 2026, 3:00 AM

* WHAT...Very cold wind chills as low as 10 below expected. * WHERE...In New Jersey, Eastern Bergen and Western Bergen Counties. In New York, Northern Westchester, Putnam, Rockland, and Southern Westchester Counties. * WHEN...From 1 AM to 10 AM EST Thursday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Wear appropriate clothing, a hat, and gloves. Keep pets indoors as much as possible. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly. Do not use generators or grills inside.


Cold Weather Advisory issued January 29 at 12:51AM EST until January 30 at 10:00AM EST by NWS Upton NY

Effective: Thu January 29, 2026, 12:51 AM
Expires: Thu January 29, 2026, 9:15 AM

* WHAT...For the first Cold Weather Advisory, very cold wind chills as low as 10 below expected. For the second Cold Weather Advisory, very cold wind chills as low as 15 below expected. * WHERE...Northern Westchester, Putnam, Rockland, and Southern Westchester Counties. * WHEN...For the first Cold Weather Advisory, until 10 AM EST this morning. For the second Cold Weather Advisory, from midnight tonight to 10 AM EST Friday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. Keep pets indoors as much as possible. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly. Do not use generators or grills inside.


Cold Weather Advisory issued January 29 at 12:51AM EST until January 29 at 10:00AM EST by NWS Upton NY

Effective: Thu January 29, 2026, 12:51 AM
Expires: Thu January 29, 2026, 9:15 AM

* WHAT...For the first Cold Weather Advisory, very cold wind chills as low as 10 below expected. For the second Cold Weather Advisory, very cold wind chills as low as 15 below expected. * WHERE...Northern Westchester, Putnam, Rockland, and Southern Westchester Counties. * WHEN...For the first Cold Weather Advisory, until 10 AM EST this morning. For the second Cold Weather Advisory, from midnight tonight to 10 AM EST Friday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. Keep pets indoors as much as possible. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly. Do not use generators or grills inside.


Cold Weather Advisory issued January 29 at 12:51AM EST until January 29 at 10:00AM EST by NWS Upton NY

Effective: Thu January 29, 2026, 12:51 AM
Expires: Thu January 29, 2026, 9:15 AM

* WHAT...For the first Cold Weather Advisory, very cold wind chills as low as 10 below expected. For the second Cold Weather Advisory, very cold wind chills as low as 12 below expected. * WHERE...Eastern Bergen and Western Bergen Counties. * WHEN...For the first Cold Weather Advisory, until 10 AM EST this morning. For the second Cold Weather Advisory, from midnight tonight to 10 AM EST Friday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. Keep pets indoors as much as possible. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly. Do not use generators or grills inside.


Cold Weather Advisory issued January 29 at 12:51AM EST until January 30 at 10:00AM EST by NWS Upton NY

Effective: Thu January 29, 2026, 12:51 AM
Expires: Thu January 29, 2026, 9:15 AM

* WHAT...For the first Cold Weather Advisory, very cold wind chills as low as 10 below expected. For the second Cold Weather Advisory, very cold wind chills as low as 12 below expected. * WHERE...Eastern Bergen and Western Bergen Counties. * WHEN...For the first Cold Weather Advisory, until 10 AM EST this morning. For the second Cold Weather Advisory, from midnight tonight to 10 AM EST Friday. * IMPACTS...The cold wind chills could result in hypothermia if precautions are not taken.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. Keep pets indoors as much as possible. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly. Do not use generators or grills inside.
Thursday, January 29, 2026

Weather Forecast

Sunny
23°F
3.2°F
14.1°F
65%
0 in
0%
0%
14.8 mph
0.3


Air Quality

AQI: 1 - Good
PM2.5: 14.9 μg/m3
PM10: 15.03 μg/m3
Carbon Monoxide: 298.61 μg/m3
Nitrogen Dioxide: 29.56 μg/m3
Sulphur Dioxide: 4.13 μg/m3
Ozone: 45.72 μg/m3

Astronomical

Sunrise: 7:05 AM
Sun Transit: 12:05 AM
Sunset: 5:06 PM
Daylight: 10 hrs 1 mins
Moonrise: 1:14 PM
Moon Transit: 9:25 PM
Moonset: 4:31 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 86.7%

Best Times for Fishing or Hunting

Major Periods

10:44 AM - 1:14 PM
8:55 PM - 11:25 PM

Minor Periods

12:44 AM - 2:14 PM
4:01 AM - 5:31 AM

Action Rating: 2 out of 5

Friday, January 30, 2026

Weather Forecast

Sunny
22.6°F
7.9°F
16.5°F
69%
0 in
0%
0%
14.3 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 6.17 μg/m3
PM10: 6.26 μg/m3
Carbon Monoxide: 227.05 μg/m3
Nitrogen Dioxide: 16.35 μg/m3
Sulphur Dioxide: 3.06 μg/m3
Ozone: 58.96 μg/m3

Astronomical

Sunrise: 7:04 AM
Sun Transit: 12:05 AM
Sunset: 5:08 PM
Daylight: 10 hrs 3 mins
Moonrise: 2:25 PM
Moon Transit: 10:29 PM
Moonset: 5:34 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 93.4%

Best Times for Fishing or Hunting

Major Periods

11:48 AM - 2:18 PM
12:00 AM - 12:00 AM

Minor Periods

1:55 PM - 3:25 PM
5:04 AM - 6:34 AM

Action Rating: 2 out of 5

Saturday, January 31, 2026

Weather Forecast

Partly Cloudy
18.9°F
8.4°F
14.1°F
72%
0 in
0%
0%
20.6 mph
0.4


Air Quality

AQI: 1 - Good
PM2.5: 8.16 μg/m3
PM10: 8.33 μg/m3
Carbon Monoxide: 226.53 μg/m3
Nitrogen Dioxide: 19.95 μg/m3
Sulphur Dioxide: 3.09 μg/m3
Ozone: 53.44 μg/m3

Astronomical

Sunrise: 7:03 AM
Sun Transit: 12:05 AM
Sunset: 5:09 PM
Daylight: 10 hrs 6 mins
Moonrise: 3:42 PM
Moon Transit: 11:29 PM
Moonset: 6:24 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 97.9%

Best Times for Fishing or Hunting

Major Periods

12:50 AM - 3:20 PM
12:00 AM - 12:00 AM

Minor Periods

3:12 PM - 4:42 PM
5:54 AM - 7:24 AM

Action Rating: 4 out of 5

Sunday, February 1, 2026

Weather Forecast

Blizzard
24.3°F
18.1°F
21.8°F
86%
0.89 in
67%
45%
33.3 mph
0.2


Air Quality

AQI: 1 - Good
PM2.5: 5.01 μg/m3
PM10: 5.37 μg/m3
Carbon Monoxide: 199.33 μg/m3
Nitrogen Dioxide: 11.33 μg/m3
Sulphur Dioxide: 2.17 μg/m3
Ozone: 70.68 μg/m3

Astronomical

Sunrise: 7:02 AM
Sun Transit: 12:05 AM
Sunset: 5:10 PM
Daylight: 10 hrs 8 mins
Moonrise: 5:00 PM
Moon Transit: 12:00 AM
Moonset: 7:04 AM
Moon Phase: Full
Moon Illumination: 99.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
1:47 PM - 4:17 PM

Minor Periods

4:30 PM - 6:00 PM
6:34 AM - 8:04 AM

Action Rating: 4 out of 5

Monday, February 2, 2026

Weather Forecast

Sunny
31°F
15.3°F
22°F
79%
0 in
0%
0%
19.7 mph
0


Air Quality

AQI: 1 - Good
PM2.5: 4.92 μg/m3
PM10: 5.24 μg/m3
Carbon Monoxide: 175.9 μg/m3
Nitrogen Dioxide: 8.57 μg/m3
Sulphur Dioxide: 2.41 μg/m3
Ozone: 81.08 μg/m3

Astronomical

Sunrise: 7:01 AM
Sun Transit: 12:06 AM
Sunset: 5:11 PM
Daylight: 10 hrs 10 mins
Moonrise: 6:15 PM
Moon Transit: 12:24 AM
Moonset: 7:35 AM
Moon Phase: Full
Moon Illumination: 99.4%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:39 PM - 5:09 PM

Minor Periods

5:45 PM - 7:15 PM
7:05 AM - 8:35 AM

Action Rating: 5 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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