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.

Overcast

70°F

21°C

Humidity 82%
Wind Speed N 12 mph
Barometer 29.99 in (1015.6 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 7 Jul 1:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: A 30 percent chance of rain. Cloudy, with a high near 73. North wind around 13 mph.

    High: 73 °F

    Chance Rain

  • Tonight

    Tonight: A 30 percent chance of rain before 8pm. Mostly cloudy, with a low around 64. North wind around 10 mph.

    Low: 64 °F

    Chance Rain
    then Mostly
    Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. North wind 6 to 10 mph.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 68. Southwest wind around 8 mph.

    Low: 68 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly sunny, with a high near 82. Southwest wind 8 to 15 mph.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 50%.

    Low: 71 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of rain. Cloudy, with a high near 73. North wind around 13 mph.
Tonight
A 30 percent chance of rain before 8pm. Mostly cloudy, with a low around 64. North wind around 10 mph.
Wednesday
Mostly sunny, with a high near 78. North wind 6 to 10 mph.
Wednesday Night
Increasing clouds, with a low around 68. Southwest wind around 8 mph.
Thursday
Mostly sunny, with a high near 82. Southwest wind 8 to 15 mph.
Thursday Night
A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 50%.
Friday
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 72.
Saturday
Mostly sunny, with a high near 83.
Saturday Night
Partly cloudy, with a low around 69.
Sunday
Sunny, with a high near 85.
Sunday Night
Partly cloudy, with a low around 70.
Monday
Mostly sunny, with a high near 86.
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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:
2:36 pm EDT Jul 7, 2026
Forecast Valid:
2pm EDT Jul 7, 2026-6pm EDT Jul 13, 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