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

53°F

12°C

Humidity 69%
Wind Speed N 15 G 28 mph
Barometer 29.86 in (1011.0 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 27 Mar 8:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: A 20 percent chance of showers before 11am. Mostly cloudy, with a temperature falling to around 47 by 4pm. North wind 13 to 15 mph.

    High: 54 °F⇓

    Slight Chance
    Showers then
    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 29. North wind 5 to 8 mph.

    Low: 29 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 41. Wind chill values between 20 and 30. Northwest wind 13 to 15 mph.

    High: 41 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28. Northwest wind 5 to 8 mph becoming calm after midnight.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 47. South wind 6 to 16 mph, with gusts as high as 26 mph.

    High: 47 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 56.

    High: 56 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of rain. Partly sunny, with a high near 57.

    High: 57 °F

    Chance Rain

Detailed Forecast

Today
A 20 percent chance of showers before 11am. Mostly cloudy, with a temperature falling to around 47 by 4pm. North wind 13 to 15 mph.
Tonight
Mostly cloudy, with a low around 29. North wind 5 to 8 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 41. Wind chill values between 20 and 30. Northwest wind 13 to 15 mph.
Saturday Night
Partly cloudy, with a low around 28. Northwest wind 5 to 8 mph becoming calm after midnight.
Sunday
Mostly sunny, with a high near 47. South wind 6 to 16 mph, with gusts as high as 26 mph.
Sunday Night
Mostly cloudy, with a low around 39.
Monday
Partly sunny, with a high near 56.
Monday Night
Mostly cloudy, with a low around 44.
Tuesday
A 30 percent chance of rain. Partly sunny, with a high near 57.
Tuesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 45.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 61.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 46.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 58.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
7:52 am EDT Mar 27, 2026
Forecast Valid:
9am EDT Mar 27, 2026-6pm EDT Apr 2, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation