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.

Light Snow Fog/Mist

32°F

0°C

Humidity 92%
Wind Speed NW 12 mph
Barometer 29.78 in (1008.5 mb)
Dewpoint 30°F (-1°C)
Visibility 4.00 mi
Wind Chill23°F (-5°C)
Last update 18 Jan 11:56 pm EST
Extended Forecast for

Islip NY

Winter Weather Advisory January 19, 12:47am until January 19, 04:00am
Click here for hazard details and duration
Winter Weather Advisory
  •  
    Winter Weather Advisory January 19, 12:47am until January 19, 04:00am

    NOW until 4:00am Mon

    Winter Weather Advisory

  • Overnight

    Low: 26 °F

    Snow Likely

  • M.L.King Day

    M.L.King Day: Increasing clouds, with a high near 34. Wind chill values between 15 and 25. West wind 9 to 15 mph.

    High: 34 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Mostly cloudy, then gradually becoming clear, with a low around 17. Wind chill values between 5 and 15. West wind 14 to 18 mph, with gusts as high as 30 mph.

    Low: 17 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 24. Wind chill values between zero and 10. West wind 15 to 17 mph, with gusts as high as 29 mph.

    High: 24 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 13. West wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 13 °F

    Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of rain before 1pm. Partly sunny, with a high near 40.

    High: 40 °F

    Chance Rain

Detailed Forecast

Overnight
Snow likely, mainly before 1am. Mostly cloudy, with a low around 26. Wind chill values between 20 and 25. Northwest wind 7 to 9 mph. Chance of precipitation is 60%. Total nighttime snow accumulation of 1 to 3 inches possible.
M.L.King Day
Increasing clouds, with a high near 34. Wind chill values between 15 and 25. West wind 9 to 15 mph.
Monday Night
Mostly cloudy, then gradually becoming clear, with a low around 17. Wind chill values between 5 and 15. West wind 14 to 18 mph, with gusts as high as 30 mph.
Tuesday
Sunny, with a high near 24. Wind chill values between zero and 10. West wind 15 to 17 mph, with gusts as high as 29 mph.
Tuesday Night
Clear, with a low around 13. West wind 7 to 11 mph, with gusts as high as 21 mph.
Wednesday
Mostly sunny, with a high near 38.
Wednesday Night
Mostly cloudy, with a low around 29.
Thursday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 40.
Thursday Night
Mostly clear, with a low around 20.
Friday
Mostly sunny, with a high near 31.
Friday Night
Partly cloudy, with a low around 19.
Saturday
A 30 percent chance of snow. Partly sunny, with a high near 31.
Saturday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 13.
Sunday
A 40 percent chance of snow. Partly sunny, with a high near 23.
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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:
8:25 pm EST Jan 18, 2026
Forecast Valid:
12am EST Jan 19, 2026-6pm EST Jan 25, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation