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, Long Island Mac Arthur Airport 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 40 percent chance of snow after 4am.  Areas of freezing fog. Mostly cloudy, with a low around 30. Calm wind.

    Low: 30 °F

    Chance Snow
    and Areas
    Freezing Fog

  • Sunday

    Sunday: Snow, possibly mixed with rain, becoming all snow after 4pm.  High near 37. Calm wind becoming northeast around 6 mph in the afternoon.  Chance of precipitation is 100%. New snow accumulation of less than one inch possible.

    High: 37 °F

    Rain/Snow

  • Sunday Night

    Sunday Night: Snow, mainly before 10pm.  Low around 21. Light and variable wind becoming northwest around 6 mph in the evening.  Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.

    Low: 21 °F

    Snow then
    Chance Snow

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 32. Wind chill values between 15 and 20. West wind 6 to 15 mph, with gusts as high as 28 mph.

    High: 32 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 15. West wind 10 to 13 mph, with gusts as high as 26 mph.

    Low: 15 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 24.

    High: 24 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 12.

    Low: 12 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 40 percent chance of snow after 4am. Areas of freezing fog. Mostly cloudy, with a low around 30. Calm wind.
Sunday
Snow, possibly mixed with rain, becoming all snow after 4pm. High near 37. Calm wind becoming northeast around 6 mph in the afternoon. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.
Sunday Night
Snow, mainly before 10pm. Low around 21. Light and variable wind becoming northwest around 6 mph in the evening. Chance of precipitation is 80%. New snow accumulation of 2 to 4 inches possible.
M.L.King Day
Mostly sunny, with a high near 32. Wind chill values between 15 and 20. West wind 6 to 15 mph, with gusts as high as 28 mph.
Monday Night
Partly cloudy, with a low around 15. West wind 10 to 13 mph, with gusts as high as 26 mph.
Tuesday
Mostly sunny, with a high near 24.
Tuesday Night
Mostly clear, with a low around 12.
Wednesday
Mostly sunny, with a high near 37.
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 25.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
1:04 am EST Jan 18, 2026
2am EST Jan 18, 2026-6pm EST Jan 24, 2026
 
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Additional Resources

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