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

44°F

7°C

Humidity 60%
Wind Speed NW 9 mph
Barometer 29.99 in (1015.5 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 14 Nov 1:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Mostly clear, with a steady temperature around 40. Northwest wind around 10 mph, with gusts as high as 22 mph.

    Low: 40 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 49. Northwest wind 9 to 14 mph.

    High: 49 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Patchy frost after 1am. Otherwise, partly cloudy, with a low around 33. North wind 5 to 8 mph, with gusts as high as 21 mph.

    Low: 33 °F

    Partly Cloudy
    then Patchy
    Frost

  • Saturday

    Saturday: Patchy frost before 8am. Otherwise, increasing clouds, with a high near 54. Northwest wind 5 to 8 mph becoming southwest in the afternoon.

    High: 54 °F

    Patchy Frost
    then Partly
    Sunny

  • Saturday Night

    Saturday Night: Rain. Temperature rising to around 52 by midnight. Southwest wind 7 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 48 °F⇑

    Rain

  • Sunday

    Sunday: A 30 percent chance of rain before 1pm. Partly sunny, with a temperature rising to near 55 by 9am, then falling to around 48 during the remainder of the day.

    High: 55 °F⇓

    Chance Rain

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 36.

    Low: 36 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 40. Northwest wind around 10 mph, with gusts as high as 22 mph.
Friday
Mostly sunny, with a high near 49. Northwest wind 9 to 14 mph.
Friday Night
Patchy frost after 1am. Otherwise, partly cloudy, with a low around 33. North wind 5 to 8 mph, with gusts as high as 21 mph.
Saturday
Patchy frost before 8am. Otherwise, increasing clouds, with a high near 54. Northwest wind 5 to 8 mph becoming southwest in the afternoon.
Saturday Night
Rain. Temperature rising to around 52 by midnight. Southwest wind 7 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
A 30 percent chance of rain before 1pm. Partly sunny, with a temperature rising to near 55 by 9am, then falling to around 48 during the remainder of the day.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Mostly sunny, with a high near 48.
Monday Night
Mostly clear, with a low around 35.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Partly cloudy, with a low around 34.
Wednesday
Mostly sunny, with a high near 49.
Wednesday Night
Partly cloudy, with a low around 34.
Thursday
Mostly sunny, with a high near 49.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
1:06 am EST Nov 14, 2025
Forecast Valid:
2am EST Nov 14, 2025-6pm EST Nov 20, 2025
 
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Additional Resources

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