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.

Partly Cloudy

75°F

24°C

Humidity 82%
Wind Speed SW 10 mph
Barometer 30.24 in (1024.1 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 17 Sep 9:56 am EDT
Extended Forecast for

Islip NYSimilar City Names

  • Today

    Today: Scattered showers, mainly between 2pm and 4pm. Mostly sunny, with a steady temperature around 76. Southwest wind 8 to 11 mph. Chance of precipitation is 30%.

    High: 76 °F

    Mostly Sunny
    then
    Scattered
    Showers

  • Tonight

    Tonight: A slight chance of showers before midnight, then a chance of showers and thunderstorms between midnight and 2am, then a slight chance of showers after 2am. Mostly cloudy, with a low around 68. South wind 7 to 10 mph. Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 79. North wind 8 to 11 mph.

    High: 79 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 58. North wind around 9 mph.

    Low: 58 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 70. Northeast wind 7 to 10 mph.

    High: 70 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 58.

    Low: 58 °F

    Mostly Cloudy

  • Sunday

    Sunday: Showers. High near 72. Chance of precipitation is 80%.

    High: 72 °F

    Showers

  • Sunday Night

    Sunday Night: Showers, mainly before 2am. Low around 58. Chance of precipitation is 80%.

    Low: 58 °F

    Showers

  • Monday

    Monday: A 30 percent chance of showers before 8am. Partly sunny, with a high near 70.

    High: 70 °F

    Chance
    Showers then
    Partly Sunny

Detailed Forecast

Today
Scattered showers, mainly between 2pm and 4pm. Mostly sunny, with a steady temperature around 76. Southwest wind 8 to 11 mph. Chance of precipitation is 30%.
Tonight
A slight chance of showers before midnight, then a chance of showers and thunderstorms between midnight and 2am, then a slight chance of showers after 2am. Mostly cloudy, with a low around 68. South wind 7 to 10 mph. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 79. North wind 8 to 11 mph.
Friday Night
Partly cloudy, with a low around 58. North wind around 9 mph.
Saturday
Mostly sunny, with a high near 70. Northeast wind 7 to 10 mph.
Saturday Night
Mostly cloudy, with a low around 58.
Sunday
Showers. High near 72. Chance of precipitation is 80%.
Sunday Night
Showers, mainly before 2am. Low around 58. Chance of precipitation is 80%.
Monday
A 30 percent chance of showers before 8am. Partly sunny, with a high near 70.
Monday Night
Mostly cloudy, with a low around 56.
Tuesday
Partly sunny, with a high near 68.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 68.
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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:
10:26 am EDT Sep 17, 2026
Forecast Valid:
10am EDT Sep 17, 2026-6pm EDT Sep 23, 2026
 
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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