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.

Fair

63°F

17°C

Humidity 97%
Wind Speed Calm
Barometer 30.23 in (1023.6 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 9 Sep 3:56 am EDT
Extended Forecast for

Islip NY

  • Today

    Today: Mostly sunny, with a high near 81. Light southwest wind becoming south 10 to 15 mph in the morning.

    High: 81 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 72. Southwest wind 16 to 18 mph, with gusts as high as 30 mph.

    Low: 72 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers before 11am, then a slight chance of showers after 5pm. Mostly sunny, with a high near 85. West wind 11 to 13 mph. Chance of precipitation is 20%.

    High: 85 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: A 40 percent chance of showers, mainly between 8pm and 2am. Mostly cloudy, with a low around 66. West wind around 6 mph.

    Low: 66 °F

    Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 78. North wind 6 to 8 mph.

    High: 78 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of showers after 2am. Mostly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A 40 percent chance of showers before 2pm. Partly sunny, with a high near 80.

    High: 80 °F

    Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 81. Light southwest wind becoming south 10 to 15 mph in the morning.
Tonight
Partly cloudy, with a low around 72. Southwest wind 16 to 18 mph, with gusts as high as 30 mph.
Thursday
A slight chance of showers before 11am, then a slight chance of showers after 5pm. Mostly sunny, with a high near 85. West wind 11 to 13 mph. Chance of precipitation is 20%.
Thursday Night
A 40 percent chance of showers, mainly between 8pm and 2am. Mostly cloudy, with a low around 66. West wind around 6 mph.
Friday
Sunny, with a high near 78. North wind 6 to 8 mph.
Friday Night
Mostly clear, with a low around 62.
Saturday
Mostly sunny, with a high near 77.
Saturday Night
A 40 percent chance of showers after 2am. Mostly cloudy, with a low around 66.
Sunday
A 40 percent chance of showers before 2pm. Partly sunny, with a high near 80.
Sunday Night
Mostly cloudy, with a low around 67.
Monday
Mostly sunny, with a high near 81.
Monday Night
Partly cloudy, with a low around 66.
Tuesday
Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
2:23 am EDT Sep 9, 2026
Forecast Valid:
4am EDT Sep 9, 2026-6pm EDT Sep 15, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation