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.

Mostly Cloudy

73°F

23°C

Humidity 87%
Wind Speed S 3 mph
Barometer 30.05 in (1017.5 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 27 Aug 2:56 am EDT
Extended Forecast for

Central Islip NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 69. South wind around 5 mph.

    Low: 69 °F

    Mostly Cloudy

  • Thursday

    Thursday: A slight chance of showers and thunderstorms between 11am and 5pm. Partly sunny, with a high near 81. South wind 8 to 14 mph. Chance of precipitation is 20%.

    High: 81 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms after 8pm. Increasing clouds, with a low around 68. South wind 5 to 10 mph becoming light after midnight.

    Low: 68 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A slight chance of showers before 11am, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 82. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 40%.

    High: 82 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 66. Light and variable wind.

    Low: 66 °F

    Chance
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 69. South wind around 5 mph.
Thursday
A slight chance of showers and thunderstorms between 11am and 5pm. Partly sunny, with a high near 81. South wind 8 to 14 mph. Chance of precipitation is 20%.
Thursday Night
A 20 percent chance of showers and thunderstorms after 8pm. Increasing clouds, with a low around 68. South wind 5 to 10 mph becoming light after midnight.
Friday
A slight chance of showers before 11am, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 82. Calm wind becoming southwest around 6 mph in the afternoon. Chance of precipitation is 40%.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 66. Light and variable wind.
Saturday
Mostly sunny, with a high near 81.
Saturday Night
Partly cloudy, with a low around 65.
Sunday
Mostly sunny, with a high near 82.
Sunday Night
Partly cloudy, with a low around 69.
Monday
Partly sunny, with a high near 83.
Monday Night
Mostly cloudy, with a low around 68.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 81.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 68.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Central Islip NY
 40.79°N 73.2°W (Elev. 98 ft)
Last Update:
3:06 am EDT Aug 27, 2026
Forecast Valid:
3am EDT Aug 27, 2026-6pm EDT Sep 2, 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