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.

Fog/Mist

62°F

17°C

Humidity 96%
Wind Speed SW 6 mph
Barometer 29.69 in (1005.3 mb)
Dewpoint 61°F (16°C)
Visibility 5.00 mi
Last update 17 May 3:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: A 40 percent chance of showers and thunderstorms, mainly between 8am and 2pm. Patchy fog before 11am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 75. South wind 5 to 11 mph.

    High: 75 °F

    Chance
    Showers and
    Patchy Fog

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 11pm. Partly cloudy, with a low around 59. Southwest wind around 8 mph becoming west after midnight.

    Low: 59 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Increasing clouds, with a high near 72. West wind 10 to 15 mph, with gusts as high as 26 mph.

    High: 72 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 55. Northwest wind 11 to 13 mph, with gusts as high as 24 mph.

    Low: 55 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 74. Northwest wind around 14 mph, with gusts as high as 24 mph.

    High: 74 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 63. Chance of precipitation is 60%.

    High: 63 °F

    Chance
    Showers then
    Showers
    Likely

Detailed Forecast

Today
A 40 percent chance of showers and thunderstorms, mainly between 8am and 2pm. Patchy fog before 11am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 75. South wind 5 to 11 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 11pm. Partly cloudy, with a low around 59. Southwest wind around 8 mph becoming west after midnight.
Sunday
Increasing clouds, with a high near 72. West wind 10 to 15 mph, with gusts as high as 26 mph.
Sunday Night
Partly cloudy, with a low around 55. Northwest wind 11 to 13 mph, with gusts as high as 24 mph.
Monday
Sunny, with a high near 74. Northwest wind around 14 mph, with gusts as high as 24 mph.
Monday Night
Mostly clear, with a low around 50.
Tuesday
Sunny, with a high near 67.
Tuesday Night
Mostly cloudy, with a low around 51.
Wednesday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 63. Chance of precipitation is 60%.
Wednesday Night
Showers likely. Cloudy, with a low around 50. Chance of precipitation is 70%.
Thursday
Showers likely. Mostly cloudy, with a high near 63. Chance of precipitation is 70%.
Thursday Night
Showers likely. Mostly cloudy, with a low around 49. Chance of precipitation is 60%.
Friday
A 40 percent chance of showers. Mostly cloudy, with a high near 64.
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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:
3:31 am EDT May 17, 2025
Forecast Valid:
4am EDT May 17, 2025-6pm EDT May 23, 2025
 
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Additional Resources

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Chance of Precipitation