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

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Rain Fog/Mist

46°F

8°C

Humidity 89%
Wind Speed E 3 mph
Barometer 29.85 in (1010.9 mb)
Dewpoint 43°F (6°C)
Visibility 3.00 mi
Last update 2 Dec 11:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Rain. High near 48. East wind 7 to 11 mph becoming northeast. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 48 °F

    Rain

  • Tonight

    Tonight: Rain, mainly before 7pm. Low around 31. Wind chill values between 25 and 30. Northwest wind around 16 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 31 °F

    Rain then
    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 43. Wind chill values between 20 and 30. Northwest wind 8 to 14 mph.

    High: 43 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 31. Wind chill values between 25 and 30. West wind 6 to 11 mph.

    Low: 31 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 44. West wind 11 to 17 mph, with gusts as high as 28 mph.

    High: 44 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 19.

    Low: 19 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of light snow after 4am. Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy
    then Chance
    Light Snow

  • Saturday

    Saturday: A 30 percent chance of light snow before 10am. Partly sunny, with a high near 45.

    High: 45 °F

    Chance Light
    Snow then
    Partly Sunny

Detailed Forecast

This Afternoon
Rain. High near 48. East wind 7 to 11 mph becoming northeast. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Tonight
Rain, mainly before 7pm. Low around 31. Wind chill values between 25 and 30. Northwest wind around 16 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Sunny, with a high near 43. Wind chill values between 20 and 30. Northwest wind 8 to 14 mph.
Wednesday Night
Partly cloudy, with a low around 31. Wind chill values between 25 and 30. West wind 6 to 11 mph.
Thursday
Partly sunny, with a high near 44. West wind 11 to 17 mph, with gusts as high as 28 mph.
Thursday Night
Mostly clear, with a low around 19.
Friday
Mostly sunny, with a high near 37.
Friday Night
A 30 percent chance of light snow after 4am. Mostly cloudy, with a low around 28.
Saturday
A 30 percent chance of light snow before 10am. Partly sunny, with a high near 45.
Saturday Night
Partly cloudy, with a low around 30.
Sunday
Partly sunny, with a high near 43.
Sunday Night
Mostly cloudy, with a low around 23.
Monday
Mostly sunny, with a high near 36.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
12:33 pm EST Dec 2, 2025
Forecast Valid:
12pm EST Dec 2, 2025-6pm EST Dec 8, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation