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

36°F

2°C

Humidity 67%
Wind Speed N 3 mph
Barometer 30.18 in (1021.9 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 28 Mar 12:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Scattered snow showers, mainly after 4am. Mostly cloudy, with a low around 30. Calm wind becoming north 5 to 7 mph. Chance of precipitation is 30%.

    Low: 30 °F

    Scattered
    Snow Showers

  • Saturday

    Saturday: Scattered snow showers before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 41. Wind chill values between 20 and 30. Northwest wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.

    High: 41 °F

    Scattered
    Snow Showers
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 27. Northwest wind 5 to 7 mph becoming calm after midnight.

    Low: 27 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 46. Light south wind increasing to 9 to 14 mph in the morning.

    High: 46 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 39. Southwest wind around 10 mph, with gusts as high as 23 mph.

    Low: 39 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 54.

    High: 54 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain before 2pm. Partly sunny, with a high near 60.

    High: 60 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A chance of rain between 8pm and 2am. Mostly cloudy, with a low around 49. Chance of precipitation is 30%.

    Low: 49 °F

    Chance Rain

Detailed Forecast

Overnight
Scattered snow showers, mainly after 4am. Mostly cloudy, with a low around 30. Calm wind becoming north 5 to 7 mph. Chance of precipitation is 30%.
Saturday
Scattered snow showers before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 41. Wind chill values between 20 and 30. Northwest wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Saturday Night
Partly cloudy, with a low around 27. Northwest wind 5 to 7 mph becoming calm after midnight.
Sunday
Mostly sunny, with a high near 46. Light south wind increasing to 9 to 14 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 39. Southwest wind around 10 mph, with gusts as high as 23 mph.
Monday
Partly sunny, with a high near 54.
Monday Night
A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 44.
Tuesday
A 30 percent chance of rain before 2pm. Partly sunny, with a high near 60.
Tuesday Night
A chance of rain between 8pm and 2am. Mostly cloudy, with a low around 49. Chance of precipitation is 30%.
Wednesday
A 40 percent chance of rain after 2pm. Partly sunny, with a high near 63.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 40.
Thursday
A 40 percent chance of rain. Mostly cloudy, with a high near 51.
Thursday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 36.
Friday
A 50 percent chance of rain. Cloudy, with a high near 46.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
7:14 pm EDT Mar 27, 2026
Forecast Valid:
1am EDT Mar 28, 2026-6pm EDT Apr 3, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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