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

62°F

17°C

Humidity 90%
Wind Speed NE 7 mph
Barometer 30.15 in (1020.8 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 16 Jun 7:56 am EDT
Extended Forecast for

Islip NYSimilar City Names

  • Today

    Today: A 20 percent chance of light rain after 2pm. Mostly cloudy, with a high near 68. East wind around 10 mph.

    High: 68 °F

    Mostly Cloudy
    then Slight
    Chance Light
    Rain

  • Tonight

    Tonight: A 20 percent chance of light rain. Mostly cloudy, with a low around 61. East wind 5 to 8 mph.

    Low: 61 °F

    Slight Chance
    Light Rain

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 71. East wind 6 to 8 mph.

    High: 71 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers. Cloudy, with a low around 62. Southeast wind around 5 mph becoming calm in the evening.

    Low: 62 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 79. Southwest wind 3 to 8 mph. Chance of precipitation is 30%.

    High: 79 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: A 30 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 84.

    High: 84 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Partly cloudy, with a low around 67. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

Detailed Forecast

Today
A 20 percent chance of light rain after 2pm. Mostly cloudy, with a high near 68. East wind around 10 mph.
Tonight
A 20 percent chance of light rain. Mostly cloudy, with a low around 61. East wind 5 to 8 mph.
Tuesday
Mostly cloudy, with a high near 71. East wind 6 to 8 mph.
Tuesday Night
A 50 percent chance of showers. Cloudy, with a low around 62. Southeast wind around 5 mph becoming calm in the evening.
Wednesday
A chance of showers, with thunderstorms also possible after 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 79. Southwest wind 3 to 8 mph. Chance of precipitation is 30%.
Wednesday Night
Partly cloudy, with a low around 67.
Juneteenth
A 30 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 84.
Thursday Night
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Partly cloudy, with a low around 67. Chance of precipitation is 30%.
Friday
Sunny, with a high near 81.
Friday Night
Partly cloudy, with a low around 62.
Saturday
Sunny, with a high near 79.
Saturday Night
Partly cloudy, with a low around 65.
Sunday
Mostly sunny, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NYSimilar City Names
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
6:40 pm EDT Jun 15, 2025
Forecast Valid:
8am EDT Jun 16, 2025-6pm EDT Jun 22, 2025
 
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Additional Resources

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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