Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

65°F

18°C

Humidity 70%
Wind Speed SE 5 mph
Barometer 30.03 in (1016.7 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 29 Aug 1:56 am EDT
Extended Forecast for

Islip NY

  • Overnight

    Overnight: A 20 percent chance of showers before 5am.  Mostly cloudy, with a low around 67. Southwest wind around 10 mph.

    Low: 67 °F

    Slight Chance
    Showers

  • Friday

    Friday: A slight chance of showers between 8am and 2pm, then a slight chance of showers and thunderstorms after 2pm.  Mostly sunny, with a high near 77. Southwest wind 9 to 14 mph.  Chance of precipitation is 20%.

    High: 77 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 56. North wind around 7 mph.

    Low: 56 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 76. Northwest wind around 7 mph.

    High: 76 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 59. Southwest wind around 5 mph becoming light and variable.

    Low: 59 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Labor Day

    Labor Day: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers before 5am. Mostly cloudy, with a low around 67. Southwest wind around 10 mph.
Friday
A slight chance of showers between 8am and 2pm, then a slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 77. Southwest wind 9 to 14 mph. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 56. North wind around 7 mph.
Saturday
Sunny, with a high near 76. Northwest wind around 7 mph.
Saturday Night
Mostly clear, with a low around 59. Southwest wind around 5 mph becoming light and variable.
Sunday
Sunny, with a high near 77.
Sunday Night
Mostly clear, with a low around 60.
Labor Day
Mostly sunny, with a high near 76.
Monday Night
Mostly clear, with a low around 60.
Tuesday
Sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Mostly sunny, with a high near 76.
Wednesday Night
Partly cloudy, with a low around 62.
Thursday
Mostly sunny, with a high near 75.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
1:58 am EDT Aug 29, 2025
2am EDT Aug 29, 2025-6pm EDT Sep 4, 2025
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database