Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

29°C

85°F

Humidity 61%
Wind Speed N 7 km/h
Barometer 1015.7 mb (30.00 in)
Dewpoint 21°C (70°F)
Visibility 16 km
Heat Index32°C (90°F)
Last update 9 Jul 11:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 31. Southwest wind 11 to 13 km/h.

    High: 31 °C

    Mostly Sunny

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 11pm.  Increasing clouds, with a low around 22. South wind 5 to 10 km/h.

    Low: 22 °C

    Chance
    T-storms

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm.  Mostly cloudy, with a high near 27. South wind 5 to 11 km/h.  Chance of precipitation is 70%. New rainfall amounts between 5 and 7.5 mm possible.

    High: 27 °C

    Showers
    Likely

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms, mainly before 2am.  Cloudy, with a low around 21. South wind 3 to 8 km/h.

    Low: 21 °C

    Chance
    T-storms

  • Friday

    Friday: A slight chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 2pm, then a slight chance of showers and thunderstorms after 2pm.  Mostly cloudy, with a high near 27. East wind 5 to 11 km/h becoming southeast in the afternoon.  Chance of precipitation is 20%.

    High: 27 °C

    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 21.

    Low: 21 °C

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 28.

    High: 28 °C

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 21.

    Low: 21 °C

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 29.

    High: 29 °C

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 31. Southwest wind 11 to 13 km/h.
Tonight
A 40 percent chance of showers and thunderstorms, mainly after 11pm. Increasing clouds, with a low around 22. South wind 5 to 10 km/h.
Thursday
Showers likely and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 27. South wind 5 to 11 km/h. Chance of precipitation is 70%. New rainfall amounts between 5 and 7.5 mm possible.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly before 2am. Cloudy, with a low around 21. South wind 3 to 8 km/h.
Friday
A slight chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 2pm, then a slight chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 27. East wind 5 to 11 km/h becoming southeast in the afternoon. Chance of precipitation is 20%.
Friday Night
Mostly cloudy, with a low around 21.
Saturday
Partly sunny, with a high near 28.
Saturday Night
Partly cloudy, with a low around 21.
Sunday
Mostly sunny, with a high near 29.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 22.
Monday
A 30 percent chance of showers. Partly sunny, with a high near 30.
Monday Night
Partly cloudy, with a low around 22.
Tuesday
Mostly sunny, with a high near 31.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 m)
8:01 am EDT Jul 9, 2025
12pm EDT Jul 9, 2025-6pm EDT Jul 15, 2025
 
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