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.

Fair

79°F

26°C

Humidity 52%
Wind Speed S 9 mph
Barometer 30.27 in (1025.1 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 5 Oct 2:56 pm EDT
Extended Forecast for

Head of the Harbor NY

  • Tonight

    Tonight: Patchy fog after 5am. Otherwise, increasing clouds, with a low around 59. South wind 5 to 7 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Clear
    then Patchy
    Fog

  • Monday

    Monday: Patchy fog before 8am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 79. Calm wind becoming south 5 to 7 mph in the morning.

    High: 79 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 59. Southwest wind 6 to 8 mph.

    Low: 59 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78. Southwest wind 6 to 11 mph.

    High: 78 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Showers, mainly after 2am. Low around 59. South wind around 11 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 59 °F

    Chance
    Showers then
    Showers

  • Wednesday

    Wednesday: Showers, mainly before 2pm. High near 70. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 70 °F

    Showers

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers before 8pm. Mostly clear, with a low around 48.

    Low: 48 °F

    Chance
    Showers then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 5am. Otherwise, increasing clouds, with a low around 59. South wind 5 to 7 mph becoming calm in the evening.
Monday
Patchy fog before 8am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 79. Calm wind becoming south 5 to 7 mph in the morning.
Monday Night
Mostly clear, with a low around 59. Southwest wind 6 to 8 mph.
Tuesday
Mostly sunny, with a high near 78. Southwest wind 6 to 11 mph.
Tuesday Night
Showers, mainly after 2am. Low around 59. South wind around 11 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Showers, mainly before 2pm. High near 70. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday Night
A 30 percent chance of showers before 8pm. Mostly clear, with a low around 48.
Thursday
Sunny, with a high near 62.
Thursday Night
Mostly clear, with a low around 47.
Friday
Sunny, with a high near 64.
Friday Night
Partly cloudy, with a low around 51.
Saturday
Mostly sunny, with a high near 69.
Saturday Night
Partly cloudy, with a low around 52.
Sunday
Mostly sunny, with a high near 67.
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Forecast Area
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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:
2:01 pm EDT Oct 5, 2025
Forecast Valid:
3pm EDT Oct 5, 2025-6pm EDT Oct 12, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation