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.

Partly Cloudy

51°F

11°C

Humidity 36%
Wind Speed NW 17 G 24 mph
Barometer 30.01 in (1016.2 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 6 Apr 1:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 53. West wind around 10 mph, with gusts as high as 21 mph.

    High: 53 °F

    Mostly Sunny

  • Tonight

    Tonight: A 30 percent chance of showers, mainly between 11pm and 5am. Mostly cloudy, with a low around 39. Light and variable wind.

    Low: 39 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers before 8am, then a slight chance of showers after 2pm. Mostly sunny, with a high near 52. Northwest wind 6 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    High: 52 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 30. Wind chill values between 20 and 25. North wind around 10 mph, with gusts as high as 22 mph.

    Low: 30 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 47. North wind around 6 mph becoming east in the afternoon.

    High: 47 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 53. West wind around 10 mph, with gusts as high as 21 mph.
Tonight
A 30 percent chance of showers, mainly between 11pm and 5am. Mostly cloudy, with a low around 39. Light and variable wind.
Tuesday
A slight chance of showers before 8am, then a slight chance of showers after 2pm. Mostly sunny, with a high near 52. Northwest wind 6 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Tuesday Night
Mostly clear, with a low around 30. Wind chill values between 20 and 25. North wind around 10 mph, with gusts as high as 22 mph.
Wednesday
Sunny, with a high near 47. North wind around 6 mph becoming east in the afternoon.
Wednesday Night
Mostly clear, with a low around 33.
Thursday
Mostly sunny, with a high near 50.
Thursday Night
Partly cloudy, with a low around 40.
Friday
Mostly sunny, with a high near 59.
Friday Night
Partly cloudy, with a low around 46.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 45.
Sunday
Mostly sunny, with a high near 58.
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Forecast Area
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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:
2:19 pm EDT Apr 6, 2026
Forecast Valid:
2pm EDT Apr 6, 2026-6pm EDT Apr 12, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation