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.

Light Drizzle Fog/Mist

45°F

7°C

Humidity 100%
Wind Speed SE 9 mph
Barometer 30.09 in (1019.0 mb)
Dewpoint 45°F (7°C)
Visibility 0.50 mi
Wind Chill40°F (4°C)
Last update 15 Mar 8:56 pm EDT
Extended Forecast for

Head of the Harbor NY

  • Tonight

    Tonight: A slight chance of drizzle after 11pm. Patchy fog. Otherwise, cloudy, with a temperature rising to around 49 by 5am. South wind 7 to 9 mph.

    Low: 46 °F⇑

    Slight Chance
    Drizzle and
    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 11am. Otherwise, partly sunny, with a high near 60. South wind 13 to 18 mph, with gusts as high as 31 mph.

    High: 60 °F

    Patchy Fog
    then Partly
    Sunny

  • Sunday Night

    Sunday Night: Showers, mainly after 11pm. Low around 48. Breezy, with a south wind 15 to 21 mph, with gusts as high as 32 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.

    Low: 48 °F

    Showers and
    Breezy

  • Monday

    Monday: Showers likely, mainly before 2pm. Cloudy, with a high near 54. South wind 6 to 9 mph becoming north in the afternoon. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 54 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 30 percent chance of showers, mainly before 8pm. Mostly cloudy, with a low around 35. North wind around 10 mph.

    Low: 35 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 55.

    High: 55 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A slight chance of drizzle after 11pm. Patchy fog. Otherwise, cloudy, with a temperature rising to around 49 by 5am. South wind 7 to 9 mph.
Sunday
Patchy fog before 11am. Otherwise, partly sunny, with a high near 60. South wind 13 to 18 mph, with gusts as high as 31 mph.
Sunday Night
Showers, mainly after 11pm. Low around 48. Breezy, with a south wind 15 to 21 mph, with gusts as high as 32 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Monday
Showers likely, mainly before 2pm. Cloudy, with a high near 54. South wind 6 to 9 mph becoming north in the afternoon. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.
Monday Night
A 30 percent chance of showers, mainly before 8pm. Mostly cloudy, with a low around 35. North wind around 10 mph.
Tuesday
Mostly sunny, with a high near 57.
Tuesday Night
Mostly clear, with a low around 38.
Wednesday
Mostly sunny, with a high near 55.
Wednesday Night
Mostly cloudy, with a low around 41.
Thursday
A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 54.
Thursday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 33.
Friday
Mostly sunny, with a high near 46. Breezy.
Friday Night
Partly cloudy, with a low around 32.
Saturday
Mostly sunny, with a high near 51.
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ABOUT THIS FORECAST

 
Point Forecast:
Head of the Harbor NY
 40.9°N 73.15°W (Elev. 157 ft)
Last Update:
5:41 pm EDT Mar 15, 2025
Forecast Valid:
9pm EDT Mar 15, 2025-6pm EDT Mar 22, 2025
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation