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

43°F

6°C

Humidity 63%
Wind Speed S 14 mph
Barometer 29.89 in
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 13 Jan 4:56 pm EST
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: A 20 percent chance of rain after 4am. Mostly cloudy, with a low around 39. Southwest wind 8 to 10 mph, with gusts as high as 23 mph.

    Low: 39 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: A 20 percent chance of rain before 10am. Mostly cloudy, with a high near 46. Southwest wind 6 to 9 mph.

    High: 46 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain, mainly after 1am. Cloudy, with a low around 29. Calm wind becoming southwest around 6 mph after midnight.

    Low: 29 °F

    Slight Chance
    Rain then
    Chance Rain

  • Thursday

    Thursday: Cloudy, then gradually becoming mostly sunny, with a temperature rising to near 36 by 10am, then falling to around 28 during the remainder of the day. Wind chill values between 20 and 30. West wind 8 to 14 mph, with gusts as high as 24 mph.

    High: 36 °F⇓

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 17. Northwest wind around 10 mph, with gusts as high as 23 mph.

    Low: 17 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 35.

    High: 35 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of rain after 4am. Mostly cloudy, with a low around 39. Southwest wind 8 to 10 mph, with gusts as high as 23 mph.
Wednesday
A 20 percent chance of rain before 10am. Mostly cloudy, with a high near 46. Southwest wind 6 to 9 mph.
Wednesday Night
A 50 percent chance of rain, mainly after 1am. Cloudy, with a low around 29. Calm wind becoming southwest around 6 mph after midnight.
Thursday
Cloudy, then gradually becoming mostly sunny, with a temperature rising to near 36 by 10am, then falling to around 28 during the remainder of the day. Wind chill values between 20 and 30. West wind 8 to 14 mph, with gusts as high as 24 mph.
Thursday Night
Partly cloudy, with a low around 17. Northwest wind around 10 mph, with gusts as high as 23 mph.
Friday
Mostly sunny, with a high near 35.
Friday Night
Mostly cloudy, with a low around 28.
Saturday
Partly sunny, with a high near 42.
Saturday Night
Mostly cloudy, with a low around 26.
Sunday
Partly sunny, with a high near 33.
Sunday Night
Partly cloudy, with a low around 20.
M.L.King Day
Mostly sunny, with a high near 32.
Monday Night
Partly cloudy, with a low around 18.
Tuesday
Mostly sunny, with a high near 28.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
12:35 pm EST Jan 13, 2026
Forecast Valid:
5pm EST Jan 13, 2026-6pm EST Jan 20, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation