National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Summer Heat In Multiple Spots

A large dome of high pressure is expected to deliver summer heat with humidity in multiple sections of the country to start off the week. Excessive heat warnings and heat advisories are in effect across the south-central Plains, Mid to Lower Mississippi Valley and from the Mid-Atlantic into the Northeast. This includes the cities of New York, Philadelphia, Dallas, Oklahoma City and Kansas City. Read More >

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

75°F

24°C

Humidity 94%
Wind Speed Calm
Barometer 30.01 in (1016.1 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Last update 18 Aug 9:56 pm EDT
Extended Forecast for

East Islip NY

Heat Advisory until August 19, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until August 19, 08:00pm

    NOW until
    8:00pm Mon

    Heat Advisory

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 74. Southwest wind 6 to 9 mph.

    Chance
    T-storms

    Low: 74 °F

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 86. South wind 6 to 14 mph.

    Mostly Sunny
    then Slight
    Chance
    T-storms

    High: 86 °F

  • Monday
    Night

    Monday Night: A 30 percent chance of showers and thunderstorms, mainly before 11pm. Partly cloudy, with a low around 72. Southwest wind 5 to 8 mph.

    Chance
    T-storms

    Low: 72 °F

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85. Light southeast wind increasing to 5 to 10 mph in the morning.

    Slight Chance
    T-storms

    High: 85 °F

  • Tuesday
    Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. South wind 5 to 7 mph.

    Chance
    T-storms

    Low: 72 °F

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.

    Chance
    T-storms

    High: 85 °F

  • Wednesday
    Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.

    Chance
    T-storms

    Low: 72 °F

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 84. Chance of precipitation is 40%.

    Chance
    Showers then
    Chance
    T-storms

    High: 84 °F

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 74. Southwest wind 6 to 9 mph.
Monday
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 86. South wind 6 to 14 mph.
Monday Night
A 30 percent chance of showers and thunderstorms, mainly before 11pm. Partly cloudy, with a low around 72. Southwest wind 5 to 8 mph.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85. Light southeast wind increasing to 5 to 10 mph in the morning.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72. South wind 5 to 7 mph.
Wednesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Thursday
A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 84. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 40%.
Friday
Mostly sunny, with a high near 79.
Friday Night
Mostly clear, with a low around 65.
Saturday
Sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 66.
Sunday
Sunny, with a high near 80.
Click Map For Forecast
Disclaimer
Map Legend
Point Forecast:
East Islip NY
 40.73°N 73.19°W (Elev. 16 ft)
Last Update:
9:47 pm EDT Aug 18, 2019
Forecast Valid:
10pm EDT Aug 18, 2019-6pm EDT Aug 25, 2019
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Northeast Radar Mosaic 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