Showers and Storms in the East; Dangerously Hot and Dry in the West

A frontal boundary will bring scattered showers and storms to portions of the Central and Eastern U.S. through the end of the week. Meanwhile, dangerous heat will intensify across the Intermountain West and expand into the Central U.S. by early next week. Elevated wildfire conditions will develop across portions of the Northern/Central Plains and air quality issues will persist in the Northwest. Read More >

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

77°F

25°C

Humidity 94%
Wind Speed S 8 mph
Barometer 30.12 in (1019.7 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 5 Aug 11:56 pm EDT
Extended Forecast for

Islip NY

Heat Advisory August 6, 11:00am until August 7, 08:00pm
Click here for hazard details and duration
Heat Advisory
  • Overnight

    Overnight: A slight chance of showers before 2am, then a slight chance of showers after 5am.  Mostly cloudy, with a steady temperature around 77. Southwest wind around 6 mph.  Chance of precipitation is 20%.

    Low: 77 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 85. Heat index values as high as 97. Southwest wind 6 to 11 mph.

    High: 85 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 75. Southwest wind 6 to 10 mph.

    Low: 75 °F

    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 2pm.  Mostly sunny, with a high near 87. Heat index values as high as 99. Southwest wind 5 to 10 mph.

    High: 87 °F

    Sunny then
    Chance
    T-storms

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms before 2am.  Mostly cloudy, with a low around 75. Southwest wind 6 to 8 mph.

    Low: 75 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

Detailed Forecast

Overnight
A slight chance of showers before 2am, then a slight chance of showers after 5am. Mostly cloudy, with a steady temperature around 77. Southwest wind around 6 mph. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 85. Heat index values as high as 97. Southwest wind 6 to 11 mph.
Thursday Night
Partly cloudy, with a low around 75. Southwest wind 6 to 10 mph.
Friday
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87. Heat index values as high as 99. Southwest wind 5 to 10 mph.
Friday Night
A 40 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 75. Southwest wind 6 to 8 mph.
Saturday
Mostly sunny, with a high near 86.
Saturday Night
Partly cloudy, with a low around 73.
Sunday
Sunny, with a high near 87.
Sunday Night
Mostly clear, with a low around 72.
Monday
Sunny, with a high near 87.
Monday Night
Partly cloudy, with a low around 73.
Tuesday
A 30 percent chance of showers. Mostly sunny, with a high near 87.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 70.
Wednesday
Mostly sunny, with a high near 83.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
2:06 pm EDT Aug 5, 2026
12am EDT Aug 6, 2026-6pm EDT Aug 12, 2026
 
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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