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.

Mostly Cloudy

30°F

-1°C

Humidity 25%
Wind Speed N 13 mph
Barometer 30.24 in (1023.9 mb)
Dewpoint -2°F (-19°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 8 Dec 1:56 pm EST
Extended Forecast for

Islip NY

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 31. Wind chill values between 15 and 20. North wind 11 to 13 mph.

    High: 31 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 16. North wind 6 to 8 mph.

    Low: 16 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Increasing clouds, with a high near 38. Wind chill values between 10 and 20. Light and variable wind becoming southwest 5 to 8 mph in the afternoon.

    High: 38 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a steady temperature around 36. Southwest wind 10 to 13 mph, with gusts as high as 26 mph.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely, mainly after 1pm. Mostly cloudy, with a high near 48. Southwest wind 11 to 18 mph, with gusts as high as 32 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 48 °F

    Slight Chance
    Rain then
    Rain Likely

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 33.

    Low: 33 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 31. Wind chill values between 15 and 20. North wind 11 to 13 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 16. North wind 6 to 8 mph.
Tuesday
Increasing clouds, with a high near 38. Wind chill values between 10 and 20. Light and variable wind becoming southwest 5 to 8 mph in the afternoon.
Tuesday Night
Mostly cloudy, with a steady temperature around 36. Southwest wind 10 to 13 mph, with gusts as high as 26 mph.
Wednesday
Rain likely, mainly after 1pm. Mostly cloudy, with a high near 48. Southwest wind 11 to 18 mph, with gusts as high as 32 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A 40 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 33.
Thursday
Mostly sunny, with a high near 42.
Thursday Night
Partly cloudy, with a low around 25.
Friday
Mostly sunny, with a high near 37.
Friday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 26.
Saturday
A 30 percent chance of snow. Partly sunny, with a high near 38.
Saturday Night
Mostly cloudy, with a low around 23.
Sunday
Mostly sunny, with a high near 34.
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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:
12:50 pm EST Dec 8, 2025
Forecast Valid:
2pm EST Dec 8, 2025-6pm EST Dec 14, 2025
 
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Additional Resources

Radar & Satellite Image

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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