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

78°F

26°C

Humidity 48%
Wind Speed Vrbl 6 mph
Barometer 29.83 in (1009.9 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 17 Apr 3:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Scattered showers and thunderstorms. Partly sunny, with a high near 74. North wind around 9 mph. Chance of precipitation is 50%.

    High: 74 °F

    Scattered
    T-storms

  • Tonight

    Tonight: Scattered showers before 8pm. Partly cloudy, with a low around 50. East wind 5 to 8 mph becoming calm after midnight. Chance of precipitation is 30%.

    Low: 50 °F

    Scattered
    Showers then
    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 62. Northeast wind 6 to 11 mph.

    High: 62 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 2am. Cloudy, with a low around 47. Southeast wind 3 to 7 mph.

    Low: 47 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers, mainly after 8am. High near 55. Southeast wind 6 to 11 mph becoming northwest 13 to 18 mph in the afternoon. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 55 °F

    Showers

  • Sunday Night

    Sunday Night: Cloudy during the early evening, then gradual clearing, with a low around 38.

    Low: 38 °F

    Gradual
    Clearing

  • Monday

    Monday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 34.

    Low: 34 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

Detailed Forecast

This Afternoon
Scattered showers and thunderstorms. Partly sunny, with a high near 74. North wind around 9 mph. Chance of precipitation is 50%.
Tonight
Scattered showers before 8pm. Partly cloudy, with a low around 50. East wind 5 to 8 mph becoming calm after midnight. Chance of precipitation is 30%.
Saturday
Partly sunny, with a high near 62. Northeast wind 6 to 11 mph.
Saturday Night
A 30 percent chance of showers after 2am. Cloudy, with a low around 47. Southeast wind 3 to 7 mph.
Sunday
Showers, mainly after 8am. High near 55. Southeast wind 6 to 11 mph becoming northwest 13 to 18 mph in the afternoon. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Cloudy during the early evening, then gradual clearing, with a low around 38.
Monday
Mostly sunny, with a high near 52.
Monday Night
Partly cloudy, with a low around 34.
Tuesday
Sunny, with a high near 51.
Tuesday Night
Partly cloudy, with a low around 41.
Wednesday
Partly sunny, with a high near 61.
Wednesday Night
Partly cloudy, with a low around 44.
Thursday
Sunny, with a high near 61.
Thursday Night
Partly cloudy, with a low around 44.
Friday
Mostly sunny, with a high near 62.
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Forecast Area
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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:
2:24 pm EDT Apr 17, 2026
Forecast Valid:
4pm EDT Apr 17, 2026-6pm EDT Apr 24, 2026
 
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Additional Resources

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Chance of Precipitation