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.

Light Rain Fog/Mist

35°F

2°C

Humidity 89%
Wind Speed Calm
Barometer 29.68 in (1005.1 mb)
Dewpoint 32°F (0°C)
Visibility 6.00 mi
Last update 11 Feb 1:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Rain likely before 4am. Mostly cloudy, with a steady temperature around 35. Light west wind. Chance of precipitation is 60%.

    Low: 35 °F

    Rain Likely

  • Wednesday

    Wednesday: Mostly sunny, with a high near 39. West wind 6 to 15 mph, with gusts as high as 26 mph.

    High: 39 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 24. Wind chill values between 15 and 20. West wind around 11 mph, with gusts as high as 24 mph.

    Low: 24 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 34. Wind chill values between 15 and 25. Northwest wind 9 to 13 mph, with gusts as high as 25 mph.

    High: 34 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 18. Northwest wind around 6 mph.

    Low: 18 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 33.

    High: 33 °F

    Sunny

  • Friday Night

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

    Low: 25 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 24.

    Low: 24 °F

    Mostly Clear

Detailed Forecast

Overnight
Rain likely before 4am. Mostly cloudy, with a steady temperature around 35. Light west wind. Chance of precipitation is 60%.
Wednesday
Mostly sunny, with a high near 39. West wind 6 to 15 mph, with gusts as high as 26 mph.
Wednesday Night
Mostly clear, with a low around 24. Wind chill values between 15 and 20. West wind around 11 mph, with gusts as high as 24 mph.
Thursday
Sunny, with a high near 34. Wind chill values between 15 and 25. Northwest wind 9 to 13 mph, with gusts as high as 25 mph.
Thursday Night
Partly cloudy, with a low around 18. Northwest wind around 6 mph.
Friday
Sunny, with a high near 33.
Friday Night
Partly cloudy, with a low around 25.
Saturday
Mostly sunny, with a high near 38.
Saturday Night
Mostly clear, with a low around 24.
Sunday
Mostly sunny, with a high near 37.
Sunday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 28.
Washington's Birthday
A 30 percent chance of rain. Partly sunny, with a high near 41.
Monday Night
Partly cloudy, with a low around 29.
Tuesday
Partly sunny, with a high near 41.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
1:42 am EST Feb 11, 2026
Forecast Valid:
2am EST Feb 11, 2026-6pm EST Feb 17, 2026
 
Forecast Discussion
 
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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