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 Rain

42°F

6°C

Humidity 82%
Wind Speed E 3 mph
Barometer 30.12 in
Dewpoint 37°F (3°C)
Visibility 6.00 mi
Last update 10 Jan 2:56 pm EST
Extended Forecast for

Head of the Harbor NY

  • This Afternoon

    This Afternoon: Rain. High near 44. East wind around 7 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 44 °F

    Rain

  • Tonight

    Tonight: Rain, mainly before 4am. Patchy fog after 1am. Low around 40. East wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 40 °F

    Rain then
    Rain Likely
    and Patchy
    Fog

  • Sunday

    Sunday: A chance of rain before 10am, then a slight chance of rain and snow showers after 4pm. Areas of fog before 7am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 44. West wind 5 to 10 mph, with gusts as high as 24 mph. Chance of precipitation is 30%.

    High: 44 °F

    Chance Rain
    and Areas Fog
    then Slight
    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 29. Wind chill values between 20 and 25. West wind around 15 mph, with gusts as high as 32 mph.

    Low: 29 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 40. West wind 9 to 14 mph, with gusts as high as 25 mph.

    High: 40 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 44.

    High: 44 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Cloudy, with a high near 45.

    High: 45 °F

    Cloudy

Detailed Forecast

This Afternoon
Rain. High near 44. East wind around 7 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Tonight
Rain, mainly before 4am. Patchy fog after 1am. Low around 40. East wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
A chance of rain before 10am, then a slight chance of rain and snow showers after 4pm. Areas of fog before 7am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 44. West wind 5 to 10 mph, with gusts as high as 24 mph. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 29. Wind chill values between 20 and 25. West wind around 15 mph, with gusts as high as 32 mph.
Monday
Mostly sunny, with a high near 40. West wind 9 to 14 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 30.
Tuesday
Sunny, with a high near 44.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
Cloudy, with a high near 45.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 37.
Thursday Night
Partly cloudy, with a low around 21.
Friday
Mostly sunny, with a high near 33.
Friday Night
Mostly cloudy, with a low around 23.
Saturday
Mostly sunny, with a high near 37.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Head of the Harbor NY
 40.88°N 73.16°W (Elev. 148 ft)
Last Update:
1:33 pm EST Jan 10, 2026
Forecast Valid:
3pm EST Jan 10, 2026-6pm EST Jan 17, 2026
 
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Additional Resources

Radar & Satellite Image

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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