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

42°F

6°C

Humidity 82%
Wind Speed W 13 mph
Barometer 30.08 in (1018.7 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 1 Dec 12:56 am EST
Extended Forecast for

Islip Terrace NY

  • Overnight

    Overnight: Mostly clear, with a low around 35. West wind around 11 mph, with gusts as high as 25 mph.

    Low: 35 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 42. Northwest wind 7 to 13 mph, with gusts as high as 24 mph.

    High: 42 °F

    Sunny

  • Monday Night

    Monday Night: A slight chance of rain and snow between 1am and 4am, then a slight chance of rain after 4am. Increasing clouds, with a low around 29. Light and variable wind. Chance of precipitation is 20%.

    Low: 29 °F

    Partly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Tuesday

    Tuesday: Rain. High near 48. Southeast wind 5 to 10 mph becoming northeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.

    High: 48 °F

    Rain

  • Tuesday Night

    Tuesday Night: A 40 percent chance of rain before 1am. Cloudy during the early evening, then gradual clearing, with a low around 28. Northwest wind around 10 mph, with gusts as high as 23 mph.

    Low: 28 °F

    Chance Rain

  • Wednesday

    Wednesday: Sunny, with a high near 40.

    High: 40 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 19.

    Low: 19 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 35. West wind around 11 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 42. Northwest wind 7 to 13 mph, with gusts as high as 24 mph.
Monday Night
A slight chance of rain and snow between 1am and 4am, then a slight chance of rain after 4am. Increasing clouds, with a low around 29. Light and variable wind. Chance of precipitation is 20%.
Tuesday
Rain. High near 48. Southeast wind 5 to 10 mph becoming northeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Tuesday Night
A 40 percent chance of rain before 1am. Cloudy during the early evening, then gradual clearing, with a low around 28. Northwest wind around 10 mph, with gusts as high as 23 mph.
Wednesday
Sunny, with a high near 40.
Wednesday Night
Partly cloudy, with a low around 31.
Thursday
Partly sunny, with a high near 42.
Thursday Night
Partly cloudy, with a low around 19.
Friday
Mostly sunny, with a high near 38.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 25. Chance of precipitation is 50%.
Saturday
A 40 percent chance of rain. Mostly cloudy, with a high near 44.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 29.
Sunday
Partly sunny, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
5:44 pm EST Nov 30, 2025
Forecast Valid:
1am EST Dec 1, 2025-6pm EST Dec 7, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation