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.

Partly Cloudy

77°F

25°C

Humidity 79%
Wind Speed S 8 mph
Barometer 29.92 in (1013.0 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 18 Jun 1:56 pm EDT
Extended Forecast for

Islip Terrace NY

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms. Cloudy, with a steady temperature around 73. South wind around 7 mph.

    High: 73 °F

    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 67. Light and variable wind.

    Low: 67 °F

    Chance
    Showers then
    Mostly Cloudy

  • Juneteenth

    Juneteenth: A 30 percent chance of showers and thunderstorms after 2pm. Some of the storms could be severe. Increasing clouds, with a high near 83. South wind 6 to 14 mph.

    High: 83 °F

    Partly Sunny
    then Severe
    Thunderstorms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Some of the storms could be severe. Cloudy, then gradually becoming partly cloudy, with a low around 65. Southwest wind 9 to 11 mph. Chance of precipitation is 40%.

    Low: 65 °F

    Severe
    Thunderstorms
    then Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 82. Northwest wind around 10 mph.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 67.

    Low: 67 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 83.

    High: 83 °F

    Partly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Cloudy, with a steady temperature around 73. South wind around 7 mph.
Tonight
A 30 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 67. Light and variable wind.
Juneteenth
A 30 percent chance of showers and thunderstorms after 2pm. Some of the storms could be severe. Increasing clouds, with a high near 83. South wind 6 to 14 mph.
Thursday Night
A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Some of the storms could be severe. Cloudy, then gradually becoming partly cloudy, with a low around 65. Southwest wind 9 to 11 mph. Chance of precipitation is 40%.
Friday
Sunny, with a high near 82. Northwest wind around 10 mph.
Friday Night
Mostly clear, with a low around 65.
Saturday
Sunny, with a high near 82.
Saturday Night
Mostly cloudy, with a low around 67.
Sunday
Partly sunny, with a high near 83.
Sunday Night
Partly cloudy, with a low around 70.
Monday
Sunny, with a high near 88.
Monday Night
Mostly clear, with a low around 69.
Tuesday
Sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
10:28 am EDT Jun 18, 2025
Forecast Valid:
2pm EDT Jun 18, 2025-6pm EDT Jun 24, 2025
 
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