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

77.5°F
Partly cloudy
Partly cloudy
81.1°F
74.5°F
60%
S 10.5 mph
19.9 mph
73°F
65.8°F
0 in
50%
9 mi
1021 mbar
2.2

Five Day Weather Forecast

Sunny
Mon
H: 88°F
L: 61°F
Patchy rain nearby
Tue
H: 75°F
L: 59°F
Moderate rain
Wed
H: 79°F
L: 64°F
Partly Cloudy
Thu
H: 63°F
L: 54°F
Partly Cloudy
Fri
H: 58°F
L: 53°F

Air Quality

AQI: 1 - Good
PM2.5: 16.75 μg/m3
PM10: 21.95 μg/m3
Carbon Monoxide: 165.85 μg/m3
Nitrogen Dioxide: 10.35 μg/m3
Sulphur Dioxide: 1.65 μg/m3
Ozone: 103 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 12:48 AM
Sunset: 8:06 PM
Daylight: 14 hrs 34 mins
Moonrise: 6:37 AM
Moon Transit: 2:46 PM
Moonset: 10:56 PM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

4:04 AM - 6:34 AM
2:16 PM - 4:46 PM

Minor Periods

10:26 PM - 11:56 PM
6:07 AM - 7:37 AM

Action Rating: 3 out of 5

Air Quality Alert issued May 17 at 11:48PM EDT by NWS Upton NY

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Sun May 17, 2026, 11:48 PM
Expires: Mon May 18, 2026, 11:00 PM

The New York State Department of Environmental Conservation's Air Quality Health Advisory for the following counties: New York, Bronx, Kings, Queens, Richmond, Westchester and Rockland, remains in effect until 11 PM EDT this evening. Another air quality health advisory has been issued for these same areas on Monday between 11 AM and 11 PM EDT. Air quality levels in outdoor air are predicted to be greater than an Air Quality Index value of 100 for the pollutant of Ground Level Ozone. The Air Quality Index, or AQI, was created as an easy way to correlate levels of different pollutants to one scale. The higher the AQI value, the greater the health concern. When pollution levels are elevated, the New York State Department of Health recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young, and those with preexisting respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. For additional information, please visit the New York State Department of Environmental Conservation website at, https://on.ny.gov/nyaqi, or call the Air Quality Hotline at 1 800 5 3 5, 1 3 4 5.


Air Quality Alert issued May 18 at 9:44AM EDT by NWS Upton NY

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Mon May 18, 2026, 9:44 AM
Expires: Mon May 18, 2026, 11:00 PM

The New York State Department of Environmental Conservation's Air Quality Health Advisory for the following counties: New York, Bronx, Kings, Queens, Richmond, Westchester, and Rockland, now includes two additional counties: Orange and Putnam, This Air Quality Health Advisory is in effect until 11 PM EDT this evening. Air quality levels in outdoor air are predicted to be greater than an Air Quality Index value of 100 for the pollutant of Ground Level Ozone. The Air Quality Index, or AQI, was created as an easy way to correlate levels of different pollutants to one scale. The higher the AQI value, the greater the health concern. When pollution levels are elevated, the New York State Department of Health recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young, and those with preexisting respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. For additional information, please visit the New York State Department of Environmental Conservation website at, https://on.ny.gov/nyaqi, or call the Air Quality Hotline at 1 800 5 3 5, 1 3 4 5.


Air Quality Alert issued May 18 at 9:40AM EDT by NWS Upton NY

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Mon May 18, 2026, 9:40 AM
Expires: Mon May 18, 2026, 11:00 PM

The New York State Department of Environmental Conservation's Air Quality Health Advisory for the following counties: New York, Bronx, Kings, Queens, Richmond, Nassau, Suffolk, Westchester, and Rockland, now includes two additional counties: Orange and Putnam, This Air Quality Health Advisory is in effect until 11 PM EDT this evening. Air quality levels in outdoor air are predicted to be greater than an Air Quality Index value of 100 for the pollutant of Ground Level Ozone. The Air Quality Index, or AQI, was created as an easy way to correlate levels of different pollutants to one scale. The higher the AQI value, the greater the health concern. When pollution levels are elevated, the New York State Department of Health recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young, and those with preexisting respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. For additional information, please visit the New York State Department of Environmental Conservation website at, https://on.ny.gov/nyaqi, or call the Air Quality Hotline at 1 800 5 3 5, 1 3 4 5.


Air Quality Alert issued May 18 at 8:48AM EDT by NWS Upton NY

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Mon May 18, 2026, 8:48 AM
Expires: Mon May 18, 2026, 11:00 PM

The New York State Department of Environmental Conservation's Air Quality Health Advisory for the following counties: New York, Bronx, Kings, Queens, Richmond, Westchester, and Rockland, remains in effect until 11 PM EDT this evening. Air quality levels in outdoor air are predicted to be greater than an Air Quality Index value of 100 for the pollutant of Ground Level Ozone. The Air Quality Index, or AQI, was created as an easy way to correlate levels of different pollutants to one scale. The higher the AQI value, the greater the health concern. When pollution levels are elevated, the New York State Department of Health recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young, and those with preexisting respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. For additional information, please visit the New York State Department of Environmental Conservation website at, https://on.ny.gov/nyaqi, or call the Air Quality Hotline at 1 800 5 3 5, 1 3 4 5.


Air Quality Alert issued May 18 at 9:44AM EDT by NWS Upton NY

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Mon May 18, 2026, 9:44 AM
Expires: Mon May 18, 2026, 11:00 PM

The Connecticut Department of Energy and Environmental Protection's Air Quality Action Day for the following counties: Fairfield, New Haven, and Middlesex, remains in effect until 11 PM EDT this evening. An Air Quality Action Day means that Ground Level Ozone within the region may approach or exceed unhealthy standards. For additional information, please visit the Connecticut Department of Energy and Environmental Protection Web site at http://www.ct.gov/deep/aqi


Monday, May 18, 2026

Weather Forecast

Sunny
87.8°F
61.3°F
70°F
77%
0 in
0%
0%
11.9 mph
8.3


Air Quality

AQI: 2 - Moderate
PM2.5: 15.59 μg/m3
PM10: 18.91 μg/m3
Carbon Monoxide: 179.85 μg/m3
Nitrogen Dioxide: 21.24 μg/m3
Sulphur Dioxide: 2.56 μg/m3
Ozone: 93.4 μg/m3

Astronomical

Sunrise: 5:32 AM
Sun Transit: 12:48 AM
Sunset: 8:06 PM
Daylight: 14 hrs 34 mins
Moonrise: 6:37 AM
Moon Transit: 2:46 PM
Moonset: 10:56 PM
Moon Phase: New
Moon Illumination: 2.6%

Best Times for Fishing or Hunting

Major Periods

4:04 AM - 6:34 AM
2:16 PM - 4:46 PM

Minor Periods

10:26 PM - 11:56 PM
6:07 AM - 7:37 AM

Action Rating: 3 out of 5

Tuesday, May 19, 2026

Weather Forecast

Patchy rain nearby
75.1°F
59.2°F
67.4°F
77%
0.01 in
84%
0%
15.2 mph
8.3


Air Quality

AQI: 1 - Good
PM2.5: 13.77 μg/m3
PM10: 17.34 μg/m3
Carbon Monoxide: 158.85 μg/m3
Nitrogen Dioxide: 10.33 μg/m3
Sulphur Dioxide: 2.05 μg/m3
Ozone: 104.04 μg/m3

Astronomical

Sunrise: 5:31 AM
Sun Transit: 12:48 AM
Sunset: 8:07 PM
Daylight: 14 hrs 35 mins
Moonrise: 7:45 AM
Moon Transit: 3:52 PM
Moonset: 11:52 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

5:11 AM - 7:41 AM
3:22 PM - 5:52 PM

Minor Periods

12:00 AM - 12:00 AM
7:15 AM - 8:45 AM

Action Rating: 3 out of 5

Wednesday, May 20, 2026

Weather Forecast

Moderate rain
79.3°F
63.6°F
69.8°F
75%
0.47 in
84%
0%
14.5 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 11.62 μg/m3
PM10: 14.09 μg/m3
Carbon Monoxide: 154.81 μg/m3
Nitrogen Dioxide: 13.73 μg/m3
Sulphur Dioxide: 2.11 μg/m3
Ozone: 97.6 μg/m3

Astronomical

Sunrise: 5:31 AM
Sun Transit: 12:48 AM
Sunset: 8:08 PM
Daylight: 14 hrs 37 mins
Moonrise: 9:01 AM
Moon Transit: 4:54 PM
Moonset: 12:52 AM
Moon Phase: Waxing Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

6:15 AM - 8:45 AM
4:24 PM - 6:54 PM

Minor Periods

8:31 AM - 10:01 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Thursday, May 21, 2026

Weather Forecast

Partly Cloudy
62.8°F
54.4°F
59.2°F
56%
0 in
0%
0%
12.5 mph
1.4


Air Quality

AQI: 1 - Good
PM2.5: 4.46 μg/m3
PM10: 4.8 μg/m3
Carbon Monoxide: 147.5 μg/m3
Nitrogen Dioxide: 10.49 μg/m3
Sulphur Dioxide: 1.63 μg/m3
Ozone: 65.08 μg/m3

Astronomical

Sunrise: 5:30 AM
Sun Transit: 12:49 AM
Sunset: 8:09 PM
Daylight: 14 hrs 39 mins
Moonrise: 10:19 AM
Moon Transit: 5:51 PM
Moonset: 12:36 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

7:14 AM - 9:44 AM
5:21 PM - 7:51 PM

Minor Periods

9:49 AM - 11:19 AM
12:06 AM - 1:36 AM

Action Rating: 3 out of 5

Friday, May 22, 2026

Weather Forecast

Partly Cloudy
58.1°F
53.1°F
55.3°F
74%
0 in
0%
0%
8.7 mph
4


Air Quality

AQI: 1 - Good
PM2.5: 8 μg/m3
PM10: 10.57 μg/m3
Carbon Monoxide: 155.37 μg/m3
Nitrogen Dioxide: 10.85 μg/m3
Sulphur Dioxide: 1.73 μg/m3
Ozone: 56.92 μg/m3

Astronomical

Sunrise: 5:29 AM
Sun Transit: 12:49 AM
Sunset: 8:09 PM
Daylight: 14 hrs 40 mins
Moonrise: 11:33 AM
Moon Transit: 6:41 PM
Moonset: 1:10 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

8:07 AM - 10:37 AM
6:11 PM - 8:41 PM

Minor Periods

11:03 AM - 12:33 AM
12:40 AM - 2:10 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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