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

76°F

24°C

Humidity 82%
Wind Speed S 7 mph
Barometer 29.99 in (1015.3 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 19 Jul 11:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms, mainly after 5am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 74. South wind around 8 mph.

    Low: 74 °F

    Chance
    T-storms and
    Patchy Fog

  • Sunday

    Sunday: A chance of showers and thunderstorms before 11am, then a chance of showers and thunderstorms after 2pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 88. Southwest wind 6 to 11 mph. Chance of precipitation is 40%.

    High: 88 °F

    Chance
    T-storms and
    Patchy Fog

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 72. Northwest wind around 9 mph.

    Low: 72 °F

    Chance
    T-storms then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 85. North wind around 10 mph.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 66. Northeast wind around 10 mph.

    Low: 66 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms, mainly after 5am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 74. South wind around 8 mph.
Sunday
A chance of showers and thunderstorms before 11am, then a chance of showers and thunderstorms after 2pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 88. Southwest wind 6 to 11 mph. Chance of precipitation is 40%.
Sunday Night
A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 72. Northwest wind around 9 mph.
Monday
Sunny, with a high near 85. North wind around 10 mph.
Monday Night
Mostly clear, with a low around 66. Northeast wind around 10 mph.
Tuesday
Sunny, with a high near 81.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Sunny, with a high near 86.
Wednesday Night
Partly cloudy, with a low around 71.
Thursday
Mostly sunny, with a high near 88.
Thursday Night
Partly cloudy, with a low around 75.
Friday
Mostly sunny, with a high near 90.
Friday Night
Mostly cloudy, with a low around 76.
Saturday
Mostly sunny, with a high near 90.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
3:09 pm EDT Jul 19, 2025
Forecast Valid:
12am EDT Jul 20, 2025-6pm EDT Jul 26, 2025
 
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