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.

Fair

77°F

25°C

Humidity 94%
Wind Speed Calm
Barometer 30.05 in (1017.3 mb)
Dewpoint 75°F (24°C)
Visibility 9.00 mi
Heat Index78°F (26°C)
Last update 16 Jul 2:56 am EDT
Extended Forecast for

5 Miles SSE Blue Point NY

Heat Advisory July 16, 11:00am until July 17, 10:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Partly cloudy, with a low around 74. Light southwest wind.

    Low: 74 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 80. Light southwest wind becoming south 5 to 10 mph in the morning.

    High: 80 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly between 2am and 5am. Mostly cloudy, with a low around 75. Southwest wind around 10 mph.

    Low: 75 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 11am, then a chance of showers and thunderstorms after 11am. Partly sunny, with a high near 81. Southwest wind 11 to 14 mph. Chance of precipitation is 40%.

    High: 81 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a steady temperature around 79. Southwest wind around 14 mph.

    Low: 79 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 71.

    Low: 71 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 74. Light southwest wind.
Wednesday
Mostly sunny, with a high near 80. Light southwest wind becoming south 5 to 10 mph in the morning.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly between 2am and 5am. Mostly cloudy, with a low around 75. Southwest wind around 10 mph.
Thursday
A slight chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 11am, then a chance of showers and thunderstorms after 11am. Partly sunny, with a high near 81. Southwest wind 11 to 14 mph. Chance of precipitation is 40%.
Thursday Night
Partly cloudy, with a steady temperature around 79. Southwest wind around 14 mph.
Friday
Mostly sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 70.
Saturday
Mostly sunny, with a high near 80.
Saturday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 71.
Sunday
A 50 percent chance of showers. Mostly cloudy, with a high near 81.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 70.
Monday
Mostly sunny, with a high near 80.
Monday Night
Partly cloudy, with a low around 69.
Tuesday
Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSE Blue Point NY
 40.68°N 72.99°W (Elev. 0 ft)
Last Update:
2:02 am EDT Jul 16, 2025
Forecast Valid:
3am EDT Jul 16, 2025-6pm EDT Jul 22, 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