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.

Mostly Cloudy

61°F

16°C

Humidity 65%
Wind Speed S 14 mph
Barometer 29.94 in (1013.8 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 31 Mar 3:56 pm EDT
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 51. Breezy, with a southwest wind 13 to 22 mph, with gusts as high as 32 mph.

    Low: 51 °F

    Mostly Cloudy
    and Breezy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 69. Southwest wind 9 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.

    High: 69 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before midnight, then showers likely. Low around 41. Calm wind becoming east 5 to 8 mph after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 41 °F

    Showers

  • Thursday

    Thursday: A 30 percent chance of light rain, mainly before noon. Patchy fog before 2pm. Otherwise, cloudy, with a high near 47. East wind 10 to 14 mph, with gusts as high as 24 mph.

    High: 47 °F

    Chance Light
    Rain and
    Patchy Fog

  • Thursday Night

    Thursday Night: A 20 percent chance of light rain after 8pm. Areas of fog after midnight. Otherwise, cloudy, with a low around 39. East wind 5 to 7 mph.

    Low: 39 °F

    Slight Chance
    Light Rain
    and Areas Fog

  • Friday

    Friday: Areas of fog before noon. Otherwise, mostly cloudy, with a high near 59.

    High: 59 °F

    Areas Fog
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 49.

    Low: 49 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Tonight
A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 51. Breezy, with a southwest wind 13 to 22 mph, with gusts as high as 32 mph.
Wednesday
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 69. Southwest wind 9 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.
Wednesday Night
Showers and possibly a thunderstorm before midnight, then showers likely. Low around 41. Calm wind becoming east 5 to 8 mph after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
A 30 percent chance of light rain, mainly before noon. Patchy fog before 2pm. Otherwise, cloudy, with a high near 47. East wind 10 to 14 mph, with gusts as high as 24 mph.
Thursday Night
A 20 percent chance of light rain after 8pm. Areas of fog after midnight. Otherwise, cloudy, with a low around 39. East wind 5 to 7 mph.
Friday
Areas of fog before noon. Otherwise, mostly cloudy, with a high near 59.
Friday Night
Mostly cloudy, with a low around 49.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 48.
Sunday
Showers likely, mainly after 8am. Mostly cloudy, with a high near 60. Chance of precipitation is 60%.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 39.
Monday
Mostly sunny, with a high near 52.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Mostly sunny, with a high near 51.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
2:28 pm EDT Mar 31, 2026
Forecast Valid:
4pm EDT Mar 31, 2026-6pm EDT Apr 7, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation