National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fair

42°F

6°C

Humidity 85%
Wind Speed SW 12 mph
Barometer 29.81 in (1009.5 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 14 Mar 12:56 am EDT
Extended Forecast for

Sayville NY

  • Overnight

    Overnight: A 20 percent chance of showers before 2am. Mostly clear, with a low around 38. Breezy, with a southwest wind 17 to 20 mph.

    Low: 38 °F

    Slight Chance
    Showers and
    Breezy

  • Saturday

    Saturday: Sunny, with a high near 48. Breezy, with a west wind 18 to 22 mph, with gusts as high as 38 mph.

    High: 48 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 32. Northwest wind 5 to 13 mph.

    Low: 32 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 47. Northeast wind 6 to 10 mph becoming southeast in the afternoon.

    High: 47 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Rain after 2am. Low around 39. Southeast wind 11 to 18 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 39 °F

    Mostly Cloudy
    then Rain

  • Monday

    Monday: Rain, with thunderstorms also possible after 2pm. High near 56. Breezy. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 56 °F

    Rain and
    Breezy

  • Monday Night

    Monday Night: Rain and possibly a thunderstorm. Low around 35. Breezy. Chance of precipitation is 90%.

    Low: 35 °F

    Rain and
    Breezy

  • Tuesday

    Tuesday: A 30 percent chance of rain before 8am. Mostly sunny, with a high near 43. Breezy.

    High: 43 °F

    Breezy.
    Chance Rain
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of showers before 2am. Mostly clear, with a low around 38. Breezy, with a southwest wind 17 to 20 mph.
Saturday
Sunny, with a high near 48. Breezy, with a west wind 18 to 22 mph, with gusts as high as 38 mph.
Saturday Night
Increasing clouds, with a low around 32. Northwest wind 5 to 13 mph.
Sunday
Mostly cloudy, with a high near 47. Northeast wind 6 to 10 mph becoming southeast in the afternoon.
Sunday Night
Rain after 2am. Low around 39. Southeast wind 11 to 18 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Rain, with thunderstorms also possible after 2pm. High near 56. Breezy. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night
Rain and possibly a thunderstorm. Low around 35. Breezy. Chance of precipitation is 90%.
Tuesday
A 30 percent chance of rain before 8am. Mostly sunny, with a high near 43. Breezy.
Tuesday Night
Partly cloudy, with a low around 25.
Wednesday
Mostly sunny, with a high near 38.
Wednesday Night
Mostly cloudy, with a low around 30.
Thursday
Partly sunny, with a high near 43.
Thursday Night
Partly cloudy, with a low around 34.
Friday
Partly sunny, with a high near 45.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sayville NY
 40.73°N 73.07°W (Elev. 16 ft)
Last Update:
9:14 pm EDT Mar 13, 2026
Forecast Valid:
1am EDT Mar 14, 2026-6pm EDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation