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.

Overcast

50°F

10°C

Humidity 86%
Wind Speed S 10 mph
Barometer 30.19 in (1022.5 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 13 Apr 5:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Mostly cloudy, with a high near 71. Breezy, with a southwest wind 13 to 21 mph, with gusts as high as 33 mph.

    High: 71 °F

    Mostly Cloudy
    then Partly
    Sunny and
    Breezy

  • Tonight

    Tonight: Mostly clear, with a low around 54. West wind 7 to 14 mph.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 74. Light west wind becoming south 6 to 11 mph in the morning.

    High: 74 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 55. Southwest wind 7 to 10 mph.

    Low: 55 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 77. Southwest wind 7 to 13 mph.

    High: 77 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 56. Chance of precipitation is 40%.

    Low: 56 °F

    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 71. Breezy, with a southwest wind 13 to 21 mph, with gusts as high as 33 mph.
Tonight
Mostly clear, with a low around 54. West wind 7 to 14 mph.
Tuesday
Mostly sunny, with a high near 74. Light west wind becoming south 6 to 11 mph in the morning.
Tuesday Night
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 55. Southwest wind 7 to 10 mph.
Wednesday
A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 77. Southwest wind 7 to 13 mph.
Wednesday Night
A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 56. Chance of precipitation is 40%.
Thursday
Partly sunny, with a high near 72.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
Mostly sunny, with a high near 72.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 65.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 50.
Sunday
A 40 percent chance of showers. Mostly cloudy, with a high near 64.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
3:02 am EDT Apr 13, 2026
Forecast Valid:
6am EDT Apr 13, 2026-6pm EDT Apr 19, 2026
 
Forecast Discussion
 
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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