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.

Overcast

38°F

3°C

Humidity 46%
Wind Speed S 15 G 22 mph
Barometer 30.01 in (1016.2 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 13 Mar 2:56 pm EDT
Extended Forecast for

Sayville NY

  • Tonight

    Tonight: A slight chance of showers between 11pm and 2am. Mostly cloudy, then gradually becoming mostly clear, with a low around 37. South wind 14 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 20%.

    Low: 37 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 49. Breezy, with a west wind 16 to 21 mph, with gusts as high as 38 mph.

    High: 49 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 32. Northwest wind 5 to 10 mph becoming light after midnight.

    Low: 32 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 47. Light and variable wind becoming southeast 5 to 10 mph in the morning.

    High: 47 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Rain after 2am. Temperature falling to near 40 by 8pm, then rising to around 46 during the remainder of the night. Southeast wind 10 to 17 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 40 °F⇑

    Mostly Cloudy
    then Rain

  • Monday

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

    High: 56 °F

    Rain

  • Monday Night

    Monday Night: Rain and possibly a thunderstorm. Low around 34. Chance of precipitation is 90%.

    Low: 34 °F

    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain before 8am. Mostly sunny, with a high near 44.

    High: 44 °F

    Chance Rain
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

Detailed Forecast

Tonight
A slight chance of showers between 11pm and 2am. Mostly cloudy, then gradually becoming mostly clear, with a low around 37. South wind 14 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 49. Breezy, with a west wind 16 to 21 mph, with gusts as high as 38 mph.
Saturday Night
Increasing clouds, with a low around 32. Northwest wind 5 to 10 mph becoming light after midnight.
Sunday
Mostly cloudy, with a high near 47. Light and variable wind becoming southeast 5 to 10 mph in the morning.
Sunday Night
Rain after 2am. Temperature falling to near 40 by 8pm, then rising to around 46 during the remainder of the night. Southeast wind 10 to 17 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. 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 34. Chance of precipitation is 90%.
Tuesday
A 30 percent chance of rain before 8am. Mostly sunny, with a high near 44.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Mostly sunny, with a high near 38.
Wednesday Night
Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 44.
Thursday Night
Partly cloudy, with a low around 33.
Friday
Partly sunny, with a high near 46.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sayville NY
 40.76°N 73.07°W (Elev. 30 ft)
Last Update:
2:26 pm EDT Mar 13, 2026
Forecast Valid:
3pm EDT Mar 13, 2026-6pm EDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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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