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Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

24°F

-4°C

Humidity 52%
Wind Speed N 14 mph
Barometer 30.25 in (1024.4 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 15 Dec 9:56 am EST
Extended Forecast for

Islip NY

  • Today

    Today: Mostly sunny, with a high near 29. Wind chill values between 10 and 20. West wind 10 to 13 mph.

    High: 29 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of snow showers between 10pm and 1am. Mostly cloudy, with a low around 20. West wind around 7 mph. Chance of precipitation is 20%.

    Low: 20 °F

    Slight Chance
    Snow Showers

  • Tuesday

    Tuesday: Sunny, with a high near 34. Wind chill values between 15 and 25. West wind around 7 mph.

    High: 34 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a temperature rising to around 32 by 4am. Wind chill values between 20 and 25. Southwest wind 6 to 9 mph, with gusts as high as 20 mph.

    Low: 27 °F⇑

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 43. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.

    High: 43 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Rain, mainly after 1am. Low around 48. Chance of precipitation is 90%.

    Low: 48 °F

    Chance Rain
    then Rain

  • Friday

    Friday: A 40 percent chance of rain before 1pm. Partly sunny, with a high near 51.

    High: 51 °F

    Chance Rain

Detailed Forecast

Today
Mostly sunny, with a high near 29. Wind chill values between 10 and 20. West wind 10 to 13 mph.
Tonight
A slight chance of snow showers between 10pm and 1am. Mostly cloudy, with a low around 20. West wind around 7 mph. Chance of precipitation is 20%.
Tuesday
Sunny, with a high near 34. Wind chill values between 15 and 25. West wind around 7 mph.
Tuesday Night
Partly cloudy, with a temperature rising to around 32 by 4am. Wind chill values between 20 and 25. Southwest wind 6 to 9 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 43. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
Mostly sunny, with a high near 53.
Thursday Night
Rain, mainly after 1am. Low around 48. Chance of precipitation is 90%.
Friday
A 40 percent chance of rain before 1pm. Partly sunny, with a high near 51.
Friday Night
Partly cloudy, with a low around 24.
Saturday
Partly sunny, with a high near 43.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 34.
Sunday
A 30 percent chance of rain. Mostly cloudy, with a high near 47.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
1:01 am EST Dec 15, 2025
Forecast Valid:
10am EST Dec 15, 2025-6pm EST Dec 21, 2025
 
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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