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

N/A

Humidity NA
Wind Speed W 17 G 31 mph
Barometer 29.53 in
Dewpoint N/A
Visibility 10.00 mi
Last update 16 Jan 1:56 am EST
Extended Forecast for

Islip NY

  • Overnight

    Overnight: Mostly clear, with a low around 21. Wind chill values between 10 and 15. West wind around 14 mph, with gusts as high as 33 mph.

    Low: 21 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 37. Wind chill values between 10 and 20. West wind 10 to 16 mph, with gusts as high as 32 mph.

    High: 37 °F

    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a temperature rising to around 36 by 3am. Wind chill values between 25 and 30. Southwest wind around 7 mph.

    Low: 33 °F⇑

    Partly Cloudy
    then Chance
    Snow

  • Saturday

    Saturday: A chance of rain and snow before 1pm, then rain likely. Mostly cloudy, with a high near 41. Southwest wind 6 to 10 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 41 °F

    Rain/Snow
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 31. West wind 3 to 6 mph.

    Low: 31 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Sunday

    Sunday: A 30 percent chance of snow. Cloudy, with a high near 37.

    High: 37 °F

    Chance Snow

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 35.

    High: 35 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 15.

    Low: 15 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 21. Wind chill values between 10 and 15. West wind around 14 mph, with gusts as high as 33 mph.
Friday
Sunny, with a high near 37. Wind chill values between 10 and 20. West wind 10 to 16 mph, with gusts as high as 32 mph.
Friday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a temperature rising to around 36 by 3am. Wind chill values between 25 and 30. Southwest wind around 7 mph.
Saturday
A chance of rain and snow before 1pm, then rain likely. Mostly cloudy, with a high near 41. Southwest wind 6 to 10 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Saturday Night
A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 31. West wind 3 to 6 mph.
Sunday
A 30 percent chance of snow. Cloudy, with a high near 37.
Sunday Night
Partly cloudy, with a low around 22.
M.L.King Day
Sunny, with a high near 35.
Monday Night
Mostly clear, with a low around 15.
Tuesday
Sunny, with a high near 24.
Tuesday Night
Mostly clear, with a low around 14.
Wednesday
Mostly sunny, with a high near 34.
Wednesday Night
Mostly cloudy, with a low around 25.
Thursday
Partly sunny, with a high near 38.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
1:17 am EST Jan 16, 2026
Forecast Valid:
2am EST Jan 16, 2026-6pm EST Jan 22, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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