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

29°F

-2°C

Humidity 96%
Wind Speed Calm
Barometer 30.08 in (1018.7 mb)
Dewpoint 28°F (-2°C)
Visibility 3.00 mi
Last update 18 Jan 1:56 am EST
Extended Forecast for

Islip NY

Winter Weather Advisory January 18, 10:00am until January 19, 04:00am
Click here for hazard details and duration
Winter Weather Advisory

  • Overnight

    Overnight: A chance of rain and snow after 4am. Areas of freezing fog. Mostly cloudy, with a low around 31. Calm wind. Chance of precipitation is 50%.

    Low: 31 °F

    Chance
    Rain/Snow and
    Areas
    Freezing Fog

  • Sunday

    Sunday: Snow, possibly mixed with rain, becoming all snow after 4pm. High near 37. Calm wind becoming northeast 5 to 7 mph in the morning. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    High: 37 °F

    Rain/Snow

  • Sunday Night

    Sunday Night: Snow, mainly before 10pm. Low around 22. North wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

    Low: 22 °F

    Snow then
    Chance Snow

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 33. Wind chill values between 15 and 20. West wind 7 to 16 mph, with gusts as high as 29 mph.

    High: 33 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 16. West wind 11 to 14 mph, with gusts as high as 28 mph.

    Low: 16 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 25.

    High: 25 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 13.

    Low: 13 °F

    Mostly 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 28.

    Low: 28 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A chance of rain and snow after 4am. Areas of freezing fog. Mostly cloudy, with a low around 31. Calm wind. Chance of precipitation is 50%.
Sunday
Snow, possibly mixed with rain, becoming all snow after 4pm. High near 37. Calm wind becoming northeast 5 to 7 mph in the morning. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Sunday Night
Snow, mainly before 10pm. Low around 22. North wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.
M.L.King Day
Mostly sunny, with a high near 33. Wind chill values between 15 and 20. West wind 7 to 16 mph, with gusts as high as 29 mph.
Monday Night
Partly cloudy, with a low around 16. West wind 11 to 14 mph, with gusts as high as 28 mph.
Tuesday
Sunny, with a high near 25.
Tuesday Night
Mostly clear, with a low around 13.
Wednesday
Mostly sunny, with a high near 38.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
Partly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 20.
Friday
Mostly sunny, with a high near 35.
Friday Night
Mostly cloudy, with a low around 26.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.
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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:
1:04 am EST Jan 18, 2026
Forecast Valid:
2am EST Jan 18, 2026-6pm EST Jan 24, 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