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

85°F

29°C

Humidity 75%
Wind Speed SW 15 G 24 mph
Barometer 29.86 in (1010.9 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 17 Jul 11:56 am EDT
Extended Forecast for

Hauppauge NY

Heat Advisory July 17, 12:23pm until July 17, 10:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 17, 12:23pm until July 17, 10:00pm

    NOW until 10:00pm Thu

    Heat Advisory

  • This Afternoon

    High: 90 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Mostly clear, with a low around 73. Northwest wind 10 to 13 mph.

    Low: 73 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 84. Northwest wind 8 to 10 mph.

    High: 84 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 68. North wind 3 to 5 mph.

    Low: 68 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 84. Light and variable wind becoming south 5 to 8 mph in the morning.

    High: 84 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm, mainly after 2am. Mostly cloudy, with a low around 72. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 72 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before 8am, then a chance of showers and thunderstorms after 8am. Partly sunny, with a high near 85. Chance of precipitation is 60%.

    High: 85 °F

    Showers
    Likely then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms before 2pm. Mostly sunny, with a high near 90. Heat index values as high as 101. Southwest wind around 15 mph.
Tonight
Mostly clear, with a low around 73. Northwest wind 10 to 13 mph.
Friday
Mostly sunny, with a high near 84. Northwest wind 8 to 10 mph.
Friday Night
Mostly clear, with a low around 68. North wind 3 to 5 mph.
Saturday
A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 84. Light and variable wind becoming south 5 to 8 mph in the morning.
Saturday Night
Showers likely and possibly a thunderstorm, mainly after 2am. Mostly cloudy, with a low around 72. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers likely and possibly a thunderstorm before 8am, then a chance of showers and thunderstorms after 8am. Partly sunny, with a high near 85. Chance of precipitation is 60%.
Sunday Night
Partly cloudy, with a low around 68.
Monday
Sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
Mostly sunny, with a high near 82.
Tuesday Night
Partly cloudy, with a low around 69.
Wednesday
Mostly sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hauppauge NY
 40.82°N 73.2°W (Elev. 197 ft)
Last Update:
6:08 am EDT Jul 17, 2025
Forecast Valid:
12pm EDT Jul 17, 2025-6pm EDT Jul 23, 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