National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

74°F

23°C

Humidity 94%
Wind Speed S 6 mph
Barometer 29.97 in (1014.5 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 2 Aug 3:56 am EDT
Extended Forecast for

Islip NY

  • Today

    Today: A 30 percent chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 82. South wind 7 to 13 mph.

    High: 82 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 11pm, then showers likely and possibly a thunderstorm after 2am. Cloudy, with a low around 72. South wind 9 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 72 °F

    Showers
    Likely

  • Monday

    Monday: Showers and possibly a thunderstorm. High near 81. Southwest wind 13 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 81 °F

    Showers

  • Monday Night

    Monday Night: Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Cloudy, then gradually becoming partly cloudy, with a low around 68. Southwest wind 5 to 8 mph becoming northwest after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Mostly sunny, with a high near 83. North wind around 7 mph becoming south in the afternoon.

    High: 83 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 70.

    Low: 70 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 83.

    High: 83 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 82. South wind 7 to 13 mph.
Tonight
Showers and thunderstorms likely, mainly before 11pm, then showers likely and possibly a thunderstorm after 2am. Cloudy, with a low around 72. South wind 9 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
Showers and possibly a thunderstorm. High near 81. Southwest wind 13 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
Showers and thunderstorms likely before 11pm, then a chance of showers between 11pm and 2am. Cloudy, then gradually becoming partly cloudy, with a low around 68. Southwest wind 5 to 8 mph becoming northwest after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
Mostly sunny, with a high near 83. North wind around 7 mph becoming south in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 70.
Wednesday
Partly sunny, with a high near 83.
Wednesday Night
Partly cloudy, with a low around 72.
Thursday
Mostly sunny, with a high near 85.
Thursday Night
A chance of showers between 8pm and 2am. Partly cloudy, with a low around 73. Chance of precipitation is 30%.
Friday
A 30 percent chance of showers. Mostly sunny, with a high near 85.
Friday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 72.
Saturday
A 30 percent chance of showers. Mostly sunny, with a high near 85.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.25°W (Elev. 13 ft)
Last Update:
2:37 am EDT Aug 2, 2026
Forecast Valid:
4am EDT Aug 2, 2026-6pm EDT Aug 8, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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