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.

Fair

37°F

3°C

Humidity 67%
Wind Speed SW 13 mph
Barometer 29.87 in (1011.6 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 10 Dec 2:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 41. Southwest wind around 11 mph, with gusts as high as 24 mph.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely, mainly after 4pm. Mostly cloudy, with a high near 48. Southwest wind 10 to 18 mph, with gusts as high as 33 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 48 °F

    Mostly Cloudy
    then Rain
    Likely

  • Wednesday Night

    Wednesday Night: Rain, mainly before 10pm. Low around 29. Southwest wind 10 to 14 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 29 °F

    Rain then
    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 37. Wind chill values between 20 and 25. Breezy, with a west wind 15 to 20 mph, with gusts as high as 33 mph.

    High: 37 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 24. West wind 15 to 18 mph, with gusts as high as 34 mph.

    Low: 24 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 35.

    High: 35 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy
    then Chance
    Snow

  • Saturday

    Saturday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy
    then Chance
    Snow

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 41. Southwest wind around 11 mph, with gusts as high as 24 mph.
Wednesday
Rain likely, mainly after 4pm. Mostly cloudy, with a high near 48. Southwest wind 10 to 18 mph, with gusts as high as 33 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Rain, mainly before 10pm. Low around 29. Southwest wind 10 to 14 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Mostly sunny, with a high near 37. Wind chill values between 20 and 25. Breezy, with a west wind 15 to 20 mph, with gusts as high as 33 mph.
Thursday Night
Partly cloudy, with a low around 24. West wind 15 to 18 mph, with gusts as high as 34 mph.
Friday
Mostly sunny, with a high near 35.
Friday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 26.
Saturday
Partly sunny, with a high near 40.
Saturday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 26.
Sunday
A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 35.
Sunday Night
Partly cloudy, with a low around 18.
Monday
Sunny, with a high near 31.
Monday Night
Mostly cloudy, with a low around 19.
Tuesday
Partly sunny, with a high near 34.
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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)
Last Update:
2:32 am EST Dec 10, 2025
Forecast Valid:
3am EST Dec 10, 2025-6pm EST Dec 16, 2025
 
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Additional Resources

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High Temperature

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Chance of Precipitation