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.

Mostly Cloudy

60°F

16°C

Humidity 86%
Wind Speed SW 7 mph
Barometer 30.02 in (1016.4 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 21 May 7:56 am EDT
Extended Forecast for

Holtsville NY

  • Today

    Today: Areas of fog before 10am. Otherwise, mostly sunny, with a high near 71. South wind 6 to 10 mph.

    High: 71 °F

    Areas Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 56. South wind 7 to 9 mph.

    Low: 56 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 76. South wind 8 to 11 mph.

    High: 76 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 60. Southwest wind 9 to 11 mph.

    Low: 60 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A slight chance of showers and thunderstorms before 8am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 80. Southwest wind around 10 mph. Chance of precipitation is 50%.

    High: 80 °F

    Partly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 59. Chance of precipitation is 50%.

    Low: 59 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 57.

    Low: 57 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers after 2pm. Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny
    then Chance
    Showers

Detailed Forecast

Today
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 71. South wind 6 to 10 mph.
Tonight
Partly cloudy, with a low around 56. South wind 7 to 9 mph.
Wednesday
Mostly sunny, with a high near 76. South wind 8 to 11 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 60. Southwest wind 9 to 11 mph.
Thursday
A slight chance of showers and thunderstorms before 8am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 80. Southwest wind around 10 mph. Chance of precipitation is 50%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 59. Chance of precipitation is 50%.
Friday
Partly sunny, with a high near 78.
Friday Night
Mostly cloudy, with a low around 57.
Saturday
A 30 percent chance of showers after 2pm. Partly sunny, with a high near 72.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 56.
Sunday
Partly sunny, with a high near 71.
Sunday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 58.
Memorial Day
A 30 percent chance of showers. Partly sunny, with a high near 71.
Click Map For Forecast
Disclaimer
Map Legend

ABOUT THIS FORECAST

 
Point Forecast:
Holtsville NY
 40.82°N 73.05°W (Elev. 112 ft)
Last Update:
5:46 am EDT May 21, 2024
Forecast Valid:
9am EDT May 21, 2024-6pm EDT May 27, 2024
 
Forecast Discussion
 
Get as KML Get as XML

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