National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fog/Mist

33°F

1°C

Humidity 100%
Wind Speed Calm
Barometer 30.02 in (1016.5 mb)
Dewpoint 33°F (1°C)
Visibility 1.50 mi
Last update 28 Feb 11:56 pm EST
Extended Forecast for

Islip NY

  • Overnight

    Overnight: Patchy fog before 2am. Otherwise, cloudy, with a low around 29. Light north wind.

    Low: 29 °F

    Patchy Fog

  • Sunday

    Sunday: Snow likely, mainly before 1pm. Cloudy, with a high near 36. Wind chill values between 25 and 30. North wind 5 to 9 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 36 °F

    Snow Likely

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 15. Wind chill values between 5 and 10. North wind around 8 mph.

    Low: 15 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 28. Wind chill values between 5 and 15. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 28 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 20. Light south wind.

    Low: 20 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of rain and snow before 10am, then rain likely. Mostly cloudy, with a high near 42. Chance of precipitation is 70%. Little or no snow accumulation expected.

    High: 42 °F

    Chance
    Rain/Snow
    then Rain
    Likely

  • Tuesday Night

    Tuesday Night: Rain. Low around 36. Chance of precipitation is 90%.

    Low: 36 °F

    Rain

  • Wednesday

    Wednesday: Cloudy, with a high near 46.

    High: 46 °F

    Cloudy

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain. Cloudy, with a low around 36.

    Low: 36 °F

    Chance Rain

Detailed Forecast

Overnight
Patchy fog before 2am. Otherwise, cloudy, with a low around 29. Light north wind.
Sunday
Snow likely, mainly before 1pm. Cloudy, with a high near 36. Wind chill values between 25 and 30. North wind 5 to 9 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday Night
Mostly clear, with a low around 15. Wind chill values between 5 and 10. North wind around 8 mph.
Monday
Sunny, with a high near 28. Wind chill values between 5 and 15. North wind 5 to 7 mph becoming calm in the afternoon.
Monday Night
Mostly clear, with a low around 20. Light south wind.
Tuesday
A chance of rain and snow before 10am, then rain likely. Mostly cloudy, with a high near 42. Chance of precipitation is 70%. Little or no snow accumulation expected.
Tuesday Night
Rain. Low around 36. Chance of precipitation is 90%.
Wednesday
Cloudy, with a high near 46.
Wednesday Night
A 40 percent chance of rain. Cloudy, with a low around 36.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 50.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 38.
Friday
A 40 percent chance of rain. Cloudy, with a high near 47.
Friday Night
A 30 percent chance of rain. Cloudy, with a low around 37.
Saturday
Mostly cloudy, with a high near 52.
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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:
11:34 pm EST Feb 28, 2026
Forecast Valid:
12am EST Mar 1, 2026-6pm EST Mar 7, 2026
 
Forecast Discussion
 
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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