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.

Mostly Cloudy

48°F

9°C

Humidity 52%
Wind Speed S 8 mph
Barometer 29.97 in (1015.0 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 23 Nov 10:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Mostly sunny, with a high near 51. Southwest wind 6 to 9 mph.

    High: 51 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 37. West wind 8 to 10 mph, with gusts as high as 22 mph.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 50. Northwest wind 6 to 11 mph, with gusts as high as 23 mph.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 36. Light southwest wind.

    Low: 36 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A 30 percent chance of rain after 1pm. Cloudy, with a high near 55. South wind 5 to 10 mph.

    High: 55 °F

    Cloudy then
    Chance Rain

  • Tuesday Night

    Tuesday Night: Rain, mainly before 1am. Low around 48. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 48 °F

    Rain

  • Wednesday

    Wednesday: A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 59.

    High: 59 °F

    Cloudy then
    Chance Rain

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain before 1am. Mostly cloudy, with a low around 39.

    Low: 39 °F

    Chance Rain

  • Thanksgiving Day

    Thanksgiving Day: Mostly sunny, with a high near 47.

    High: 47 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 51. Southwest wind 6 to 9 mph.
Tonight
Mostly clear, with a low around 37. West wind 8 to 10 mph, with gusts as high as 22 mph.
Monday
Sunny, with a high near 50. Northwest wind 6 to 11 mph, with gusts as high as 23 mph.
Monday Night
Increasing clouds, with a low around 36. Light southwest wind.
Tuesday
A 30 percent chance of rain after 1pm. Cloudy, with a high near 55. South wind 5 to 10 mph.
Tuesday Night
Rain, mainly before 1am. Low around 48. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 59.
Wednesday Night
A 30 percent chance of rain before 1am. Mostly cloudy, with a low around 39.
Thanksgiving Day
Mostly sunny, with a high near 47.
Thursday Night
Partly cloudy, with a low around 31.
Friday
Mostly sunny, with a high near 44.
Friday Night
Mostly clear, with a low around 30.
Saturday
Mostly sunny, with a high near 43.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
4:14 am EST Nov 23, 2025
Forecast Valid:
11am EST Nov 23, 2025-6pm EST Nov 29, 2025
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation