Water Temperature of Great South Bay in West Sayville, NY

Current Water Temperature

35.8°F 2.1°C
Frigid Dangerously Cold
35.8°F
Frigid < 50°F
Cold 50°–60°
Cool 60°–70°
Comfortable 70°–80°
Warm 80°+

Severe hypothermia and cold water shock risk. Unprotected swimming causes rapid loss of dexterity in under 5 minutes.

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

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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)

Marine Weather for Great South Bay in West Sayville, NY

Marine Weather

Coastal & Marine Conditions
Open-Meteo Marine
3.0ft 0.9 m
Moderate Chop Noticeable waves and spray. Small craft exercise standard caution.
Wave Period 7s
Wave Direction 118° ESE
Swell Waves
2.4 ft
6.1s • 96° E
Wind Waves / Chop
1.0 ft
2.1s • 351° N
Ocean Current
0.5 mph
0.4 kn • 225° SW
Sea Surface Temp
59.0°F
Equivalent: 15.0°C

High & Low Tide Forecast

Falling (Ebb)
Next Tide: Low 10:00 PM (-1.9 ft)
0.0 ft (MSL) Thu, Nov 12 12 AM 6 AM 12 PM 6 PM 12 AM 6 AM Fri, Nov 13 Sat, Nov 14 ▼ Low 9:00 PM -1.2 ft ▲ High 4:00 AM +2.1 ft ▼ Low 10:00 AM -1.9 ft ▲ High 4:00 PM +0.7 ft ▼ Low 10:00 PM -1.9 ft ▲ High 4:00 AM +0.9 ft NOW
Low Tide Thu, Nov 12
9:00 PM
-1.2 ft (-0.38 m)
High Tide Fri, Nov 13
4:00 AM
+2.1 ft (0.64 m)
Low Tide Fri, Nov 13
10:00 AM
-1.9 ft (-0.57 m)
High Tide Fri, Nov 13
4:00 PM
+0.7 ft (0.20 m)
Open-Meteo Tidal Model (Mean Sea Level MSL datum) • Times in station local timezone.

5-Day Marine Wave Forecast

Today
Nov 13
5.0 ft
7.1s • E
Sat
Nov 14
2.5 ft
6.7s • ESE
Sun
Nov 15
1.8 ft
4.4s • WNW
Mon
Nov 16
1.0 ft
7.4s • ENE
Tue
Nov 17
0.8 ft
8s • SSE

Weather for West Sayville, New York

Current Weather

38.5°F
Clear
Conditions: Clear
Humidity: 79%
Feels Like: 30.6°F
Wind: N 9.8 mph
Wind Gusts: 25 mph
Pressure: 29.72 in
Precipitation: 0 in
Cloud Cover: 5%
Visibility: 11.9 mi
UV Index: 0

Five-Day Weather Forecast

Light Drizzle
Fri
H: 48°F
L: 37°F
Overcast
Sat
H: 43°F
L: 35°F
Overcast
Sun
H: 49°F
L: 36°F
Sunny
Mon
H: 50°F
L: 40°F
Sunny
Tue
H: 53°F
L: 41°F

Air Quality

EPA Index 1 • Good

Air quality is satisfactory, and air pollution poses little or no risk.

PM2.5
5.2 μg/m³
Good
PM10
5.3 μg/m³
Good
Ozone (O3)
47 μg/m³
Photochemical
NO2
14.1 μg/m³
Nitrogen Dioxide
SO2
1.1 μg/m³
Sulfur Dioxide
CO
154 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 59m daylight
Sunrise 6:37 AM
Solar Noon 11:36 AM
Sunset 4:36 PM
Moon
Waxing Crescent • 13%
Moonrise 10:48 AM
Transit 3:12 PM
Moonset 7:41 PM

Best Times for Fishing or Hunting

Major Periods

2:17 AM - 4:47 AM
2:42 PM - 5:12 PM

Minor Periods

10:18 AM - 11:48 AM
7:11 PM - 8:41 PM
Action Rating:
Fair Action 2/5
Friday, November 13, 2026

Weather Forecast

Conditions: Light Drizzle
Average Temperature: 43.5°F
Average Humidity: 85%
Chance of Rain: 73%
Wind: 16.3 mph
UV Index: 0.3

Air Quality

EPA Index 1 • Good
PM2.5
2.9 μg/m³
Good
PM10
3 μg/m³
Good
Ozone (O3)
57.9 μg/m³
Photochemical
NO2
8.4 μg/m³
Nitrogen Dioxide
SO2
0.7 μg/m³
Sulfur Dioxide
CO
139.8 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 59m daylight
Sunrise 6:37 AM
Solar Noon 11:36 AM
Sunset 4:36 PM
Moon
Waxing Crescent • 13%
Moonrise 10:48 AM
Transit 3:12 PM
Moonset 7:41 PM

Best Times for Fishing or Hunting

Major Periods

2:17 AM - 4:47 AM
2:42 PM - 5:12 PM

Minor Periods

10:18 AM - 11:48 AM
7:11 PM - 8:41 PM
Action Rating:
Fair Action 2/5
Saturday, November 14, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 39.6°F
Average Humidity: 77%
Chance of Rain: 24%
Wind: 13.9 mph
UV Index: 3.2

Air Quality

EPA Index 1 • Good
PM2.5
3.7 μg/m³
Good
PM10
3.8 μg/m³
Good
Ozone (O3)
46.5 μg/m³
Photochemical
NO2
10.1 μg/m³
Nitrogen Dioxide
SO2
0.9 μg/m³
Sulfur Dioxide
CO
133.8 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 57m daylight
Sunrise 6:38 AM
Solar Noon 11:36 AM
Sunset 4:35 PM
Moon
Waxing Crescent • 21%
Moonrise 11:26 AM
Transit 4:01 PM
Moonset 8:43 PM

Best Times for Fishing or Hunting

Major Periods

3:07 AM - 5:37 AM
3:31 PM - 6:01 PM

Minor Periods

10:56 AM - 12:26 PM
8:13 PM - 9:43 PM
Action Rating:
Fair Action 2/5
Sunday, November 15, 2026

Weather Forecast

Conditions: Overcast
Average Temperature: 42.6°F
Average Humidity: 65%
Chance of Rain: 3%
Wind: 12.7 mph
UV Index: 3.1

Air Quality

EPA Index 1 • Good
PM2.5
1.7 μg/m³
Good
PM10
1.8 μg/m³
Good
Ozone (O3)
52.3 μg/m³
Photochemical
NO2
7.7 μg/m³
Nitrogen Dioxide
SO2
0.7 μg/m³
Sulfur Dioxide
CO
126.6 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 55m daylight
Sunrise 6:40 AM
Solar Noon 11:37 AM
Sunset 4:35 PM
Moon
Waxing Crescent • 31%
Moonrise 11:58 AM
Transit 4:48 PM
Moonset 9:45 PM

Best Times for Fishing or Hunting

Major Periods

3:55 AM - 6:25 AM
4:18 PM - 6:48 PM

Minor Periods

11:28 AM - 12:58 PM
9:15 PM - 10:45 PM
Action Rating:
Very Good 4/5
Monday, November 16, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 44.4°F
Average Humidity: 61%
Chance of Rain: 0%
Wind: 11.1 mph
UV Index: 3.1

Air Quality

EPA Index 1 • Good
PM2.5
3.5 μg/m³
Good
PM10
3.6 μg/m³
Good
Ozone (O3)
52.4 μg/m³
Photochemical
NO2
13.7 μg/m³
Nitrogen Dioxide
SO2
0.8 μg/m³
Sulfur Dioxide
CO
142.5 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 53m daylight
Sunrise 6:41 AM
Solar Noon 11:37 AM
Sunset 4:34 PM
Moon
First Quarter • 42%
Moonrise 12:25 PM
Transit 5:32 PM
Moonset 10:49 PM

Best Times for Fishing or Hunting

Major Periods

4:40 AM - 7:10 AM
5:02 PM - 7:32 PM

Minor Periods

11:55 AM - 1:25 PM
10:19 PM - 11:49 PM
Action Rating:
Very Good 4/5
Tuesday, November 17, 2026

Weather Forecast

Conditions: Sunny
Average Temperature: 46.6°F
Average Humidity: 54%
Chance of Rain: 0%
Wind: 7.7 mph
UV Index: 3.1

Air Quality

EPA Index 1 • Good
PM2.5
9.4 μg/m³
Good
PM10
9.7 μg/m³
Good
Ozone (O3)
34.3 μg/m³
Photochemical
NO2
30.9 μg/m³
Nitrogen Dioxide
SO2
2 μg/m³
Sulfur Dioxide
CO
215.3 μg/m³
Carbon Monoxide

Astronomical

Sun
9h 51m daylight
Sunrise 6:42 AM
Solar Noon 11:37 AM
Sunset 4:33 PM
Moon
First Quarter • 54%
Moonrise 12:49 PM
Transit 6:15 PM
Moonset 11:52 PM

Best Times for Fishing or Hunting

Major Periods

5:24 AM - 7:54 AM
5:45 PM - 8:15 PM

Minor Periods

12:19 PM - 1:49 PM
11:22 PM - 12:52 AM
Action Rating:
Fair Action 2/5
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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