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.

Freezing Fog

31°F

-1°C

Humidity 100%
Wind Speed Calm
Barometer 30.00 in (1015.9 mb)
Dewpoint 31°F (-1°C)
Visibility 0.25 mi
Last update 1 Mar 12:56 am EST
Extended Forecast for

Islip NY

  • Overnight

    Overnight: Areas of fog before 4am. Otherwise, mostly cloudy, with a low around 30. North wind 3 to 6 mph.

    Low: 30 °F

    Areas Fog

  • Sunday

    Sunday: Snow likely, mainly before 1pm. Cloudy, then gradual clearing during the afternoon, with a high near 36. Wind chill values between 25 and 30. North wind 7 to 10 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 17. Wind chill values between 10 and 15. North wind around 8 mph.

    Low: 17 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 30. Wind chill values between 10 and 20. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 30 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a temperature rising to around 28 by 5am. Calm wind becoming south around 5 mph after midnight.

    Low: 25 °F⇑

    Mostly Clear

  • Tuesday

    Tuesday: A chance of snow before 10am, then a chance of rain and snow between 10am and 1pm, then rain after 1pm. High near 41. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    High: 41 °F

    Chance
    Rain/Snow
    then
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Rain. Low around 36. Chance of precipitation is 100%.

    Low: 36 °F

    Rain

  • Wednesday

    Wednesday: A 30 percent chance of rain before 1pm. Partly sunny, with a high near 45.

    High: 45 °F

    Chance Rain

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Cloudy, with a low around 36.

    Low: 36 °F

    Chance Rain

Detailed Forecast

Overnight
Areas of fog before 4am. Otherwise, mostly cloudy, with a low around 30. North wind 3 to 6 mph.
Sunday
Snow likely, mainly before 1pm. Cloudy, then gradual clearing during the afternoon, with a high near 36. Wind chill values between 25 and 30. North wind 7 to 10 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday Night
Mostly clear, with a low around 17. Wind chill values between 10 and 15. North wind around 8 mph.
Monday
Mostly sunny, with a high near 30. Wind chill values between 10 and 20. North wind 5 to 7 mph becoming calm in the afternoon.
Monday Night
Mostly clear, with a temperature rising to around 28 by 5am. Calm wind becoming south around 5 mph after midnight.
Tuesday
A chance of snow before 10am, then a chance of rain and snow between 10am and 1pm, then rain after 1pm. High near 41. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Tuesday Night
Rain. Low around 36. Chance of precipitation is 100%.
Wednesday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 45.
Wednesday Night
A 50 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
Rain likely. Cloudy, with a low around 37. Chance of precipitation is 60%.
Friday
A 40 percent chance of rain. Cloudy, with a high near 45.
Friday Night
A 30 percent chance of rain. Cloudy, with a low around 36.
Saturday
Cloudy, with a high near 51.
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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:
12:37 am EST Mar 1, 2026
Forecast Valid:
1am EST Mar 1, 2026-6pm EST Mar 7, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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