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

37°F

3°C

Humidity 82%
Wind Speed Calm
Barometer 30.26 in (1024.6 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 25 Nov 3:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Rain likely, mainly after 4pm. Cloudy, with a high near 59. South wind 6 to 14 mph. Chance of precipitation is 60%.

    High: 59 °F

    Cloudy then
    Rain Likely

  • Tonight

    Tonight: Rain, mainly before 4am. Steady temperature around 54. South wind 10 to 14 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 54 °F

    Rain

  • Wednesday

    Wednesday: Rain likely, mainly between 7am and 1pm. Cloudy, with a high near 62. Southwest wind 10 to 13 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 62 °F

    Rain Likely

  • Wednesday Night

    Wednesday Night: A 20 percent chance of rain before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 39. West wind 9 to 15 mph.

    Low: 39 °F

    Slight Chance
    Rain

  • Thanksgiving Day

    Thanksgiving Day: Mostly sunny, with a high near 48. Breezy, with a west wind 15 to 20 mph, with gusts as high as 34 mph.

    High: 48 °F

    Mostly Sunny
    and Breezy

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 46. Breezy.

    High: 46 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 44.

    High: 44 °F

    Sunny

Detailed Forecast

Today
Rain likely, mainly after 4pm. Cloudy, with a high near 59. South wind 6 to 14 mph. Chance of precipitation is 60%.
Tonight
Rain, mainly before 4am. Steady temperature around 54. South wind 10 to 14 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday
Rain likely, mainly between 7am and 1pm. Cloudy, with a high near 62. Southwest wind 10 to 13 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
A 20 percent chance of rain before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 39. West wind 9 to 15 mph.
Thanksgiving Day
Mostly sunny, with a high near 48. Breezy, with a west wind 15 to 20 mph, with gusts as high as 34 mph.
Thursday Night
Mostly clear, with a low around 31.
Friday
Mostly sunny, with a high near 46. Breezy.
Friday Night
Mostly clear, with a low around 31.
Saturday
Sunny, with a high near 44.
Saturday Night
Mostly cloudy, with a low around 32.
Sunday
Mostly cloudy, with a high near 51.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 38.
Monday
A 30 percent chance of rain. Mostly cloudy, with a high near 53.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
1:21 am EST Nov 25, 2025
Forecast Valid:
4am EST Nov 25, 2025-6pm EST Dec 1, 2025
 
Forecast Discussion
 
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Additional Resources

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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