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.

A Few Clouds

51°F

11°C

Humidity 50%
Wind Speed N 13 G 20 mph
Barometer 30.17 in (1021.4 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 12 May 7:56 am EDT
Extended Forecast for

Islip NYSimilar City Names

  • Today

    Today: Sunny, with a high near 64. North wind 6 to 8 mph becoming west in the afternoon.

    High: 64 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 50. Southwest wind around 8 mph.

    Low: 50 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 64. Breezy, with a south wind 11 to 20 mph, with gusts as high as 32 mph.

    High: 64 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Wednesday Night

    Wednesday Night: Showers, mainly after 2am. Low around 52. South wind 10 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 52 °F

    Chance
    Showers then
    Showers

  • Thursday

    Thursday: Showers, with thunderstorms also possible after 2pm. High near 64. South wind around 8 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 64 °F

    Showers

  • Thursday Night

    Thursday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.

    Low: 51 °F

    Showers
    Likely

  • Friday

    Friday: A 30 percent chance of showers before 2pm. Partly sunny, with a high near 66.

    High: 66 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 64. North wind 6 to 8 mph becoming west in the afternoon.
Tonight
Increasing clouds, with a low around 50. Southwest wind around 8 mph.
Wednesday
Mostly cloudy, with a high near 64. Breezy, with a south wind 11 to 20 mph, with gusts as high as 32 mph.
Wednesday Night
Showers, mainly after 2am. Low around 52. South wind 10 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
Showers, with thunderstorms also possible after 2pm. High near 64. South wind around 8 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers likely, mainly before 8pm. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.
Friday
A 30 percent chance of showers before 2pm. Partly sunny, with a high near 66.
Friday Night
Partly cloudy, with a low around 53.
Saturday
Sunny, with a high near 73.
Saturday Night
Mostly clear, with a low around 57.
Sunday
Sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 57.
Monday
Mostly sunny, with a high near 75.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NYSimilar City Names
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
2:35 am EDT May 12, 2026
Forecast Valid:
8am EDT May 12, 2026-6pm EDT May 18, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation