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.

Light Rain Fog/Mist

65°F

18°C

Humidity 93%
Wind Speed NE 13 mph
Barometer 30.06 in (1018.0 mb)
Dewpoint 63°F (17°C)
Visibility 5.00 mi
Last update 6 Jul 3:56 pm EDT
Extended Forecast for

Head of the Harbor NY

Flood Watch July 6, 04:05pm until July 7, 06:00am
Flood Advisory until July 6, 04:30pm
Click here for hazard details and duration
Flood Watch
Flood Advisory
  •  
    Flood Watch July 6, 04:05pm until July 7, 06:00am
    Flood Advisory until July 6, 04:30pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • This Afternoon

    High: 77 °F

    Showers

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 2am, then showers likely. Low around 65. East wind 11 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 65 °F

    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers, mainly before 11am. Mostly cloudy, with a high near 79. Northeast wind 11 to 13 mph.

    High: 79 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 64. North wind 8 to 11 mph.

    Low: 64 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny through mid morning, then becoming sunny, with a high near 84. North wind 6 to 8 mph.

    High: 84 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 71 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm. High near 77. East wind around 16 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Showers and possibly a thunderstorm before 2am, then showers likely. Low around 65. East wind 11 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
A 30 percent chance of showers, mainly before 11am. Mostly cloudy, with a high near 79. Northeast wind 11 to 13 mph.
Tuesday Night
Mostly cloudy, with a low around 64. North wind 8 to 11 mph.
Wednesday
Partly sunny through mid morning, then becoming sunny, with a high near 84. North wind 6 to 8 mph.
Wednesday Night
Mostly clear, with a low around 67.
Thursday
Mostly sunny, with a high near 88.
Thursday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 71.
Friday
A 50 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 71.
Saturday
A 30 percent chance of showers. Mostly sunny, with a high near 87.
Saturday Night
A 30 percent chance of showers. Partly cloudy, with a low around 69.
Sunday
Sunny, with a high near 87.
Sunday Night
Partly cloudy, with a low around 69.
Monday
Mostly sunny, with a high near 88.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Head of the Harbor NY
 40.9°N 73.15°W (Elev. 157 ft)
Last Update:
2:35 pm EDT Jul 6, 2026
Forecast Valid:
4pm EDT Jul 6, 2026-6pm EDT Jul 13, 2026
 
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