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

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

64°F

18°C

Humidity 96%
Wind Speed SW 13 G 18 mph
Barometer 30.02 in (1016.4 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 4 Nov 11:56 pm EST
Extended Forecast for

Head of the Harbor NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 59. South wind around 6 mph.

    Low: 59 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of rain after 10am. Mostly cloudy, with a high near 69. South wind 7 to 11 mph, with gusts as high as 22 mph.

    High: 69 °F

    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after 1am. Mostly cloudy, with a low around 60. South wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 60 °F

    Rain Likely

  • Friday

    Friday: Rain likely. Mostly cloudy, with a high near 67. Southwest wind 3 to 5 mph. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 67 °F

    Rain Likely

  • Friday Night

    Friday Night: A 50 percent chance of rain before 1am. Mostly cloudy, with a low around 53. Light northwest wind.

    Low: 53 °F

    Chance Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of rain after 1am. Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy
    then Chance
    Rain

  • Sunday

    Sunday: Mostly sunny, with a high near 58.

    High: 58 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 59. South wind around 6 mph.
Thursday
A 20 percent chance of rain after 10am. Mostly cloudy, with a high near 69. South wind 7 to 11 mph, with gusts as high as 22 mph.
Thursday Night
Rain likely, mainly after 1am. Mostly cloudy, with a low around 60. South wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain likely. Mostly cloudy, with a high near 67. Southwest wind 3 to 5 mph. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.
Friday Night
A 50 percent chance of rain before 1am. Mostly cloudy, with a low around 53. Light northwest wind.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
A 30 percent chance of rain after 1am. Partly cloudy, with a low around 45.
Sunday
Mostly sunny, with a high near 58.
Sunday Night
Mostly clear, with a low around 43.
Monday
Sunny, with a high near 58.
Monday Night
Mostly clear, with a low around 42.
Tuesday
Sunny, with a high near 61.
Tuesday Night
Mostly clear, with a low around 42.
Veterans Day
Sunny, with a high near 58.
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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:
9:37 pm EST Nov 4, 2026
Forecast Valid:
12am EST Nov 5, 2026-6pm EST Nov 11, 2026
 
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