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

44°F

7°C

Humidity 76%
Wind Speed SE 8 mph
Barometer 29.57 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 14 Jan 4:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: A 20 percent chance of rain. Mostly cloudy, with a steady temperature around 45. South wind around 6 mph.

    High: 45 °F

    Slight Chance
    Rain

  • Tonight

    Tonight: A 50 percent chance of rain, mainly between 7pm and 1am. Cloudy, with a low around 39. South wind 5 to 7 mph.

    Low: 39 °F

    Chance Rain

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a temperature rising to near 42 by 9am, then falling to around 33 during the remainder of the day. Wind chill values between 20 and 30. West wind 7 to 16 mph.

    High: 42 °F⇓

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 20. Wind chill values between 5 and 15. West wind 14 to 16 mph.

    Low: 20 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 36. West wind 11 to 17 mph.

    High: 36 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a steady temperature around 32.

    Low: 32 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 40 percent chance of rain. Mostly cloudy, with a high near 42.

    High: 42 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 34.

    High: 34 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

This Afternoon
A 20 percent chance of rain. Mostly cloudy, with a steady temperature around 45. South wind around 6 mph.
Tonight
A 50 percent chance of rain, mainly between 7pm and 1am. Cloudy, with a low around 39. South wind 5 to 7 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a temperature rising to near 42 by 9am, then falling to around 33 during the remainder of the day. Wind chill values between 20 and 30. West wind 7 to 16 mph.
Thursday Night
Partly cloudy, with a low around 20. Wind chill values between 5 and 15. West wind 14 to 16 mph.
Friday
Sunny, with a high near 36. West wind 11 to 17 mph.
Friday Night
Mostly cloudy, with a steady temperature around 32.
Saturday
A 40 percent chance of rain. Mostly cloudy, with a high near 42.
Saturday Night
Mostly cloudy, with a low around 27.
Sunday
A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 34.
Sunday Night
A 30 percent chance of snow before 1am. Partly cloudy, with a low around 20.
M.L.King Day
Sunny, with a high near 31.
Monday Night
Partly cloudy, with a low around 17.
Tuesday
Mostly sunny, with a high near 27.
Tuesday Night
Partly cloudy, with a low around 15.
Wednesday
Mostly sunny, with a high near 30.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
2:31 pm EST Jan 14, 2026
Forecast Valid:
5pm EST Jan 14, 2026-6pm EST Jan 21, 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