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

61°F

16°C

Humidity 97%
Wind Speed S 8 mph
Barometer 30.06 in (1017.9 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 4 Nov 8:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly cloudy, with a low around 60. Southwest wind around 6 mph.

    Low: 60 °F

    Mostly Cloudy

  • Thursday

    Thursday: A slight chance of rain between 10am and 1pm. Mostly cloudy, with a high near 69. South wind 7 to 13 mph. Chance of precipitation is 20%.

    High: 69 °F

    Slight Chance
    Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly after 1am. Mostly cloudy, with a steady temperature around 63. Southwest wind 6 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 63 °F

    Chance Rain
    then Rain
    Likely

  • Friday

    Friday: Rain and possibly a thunderstorm. High near 68. Southwest wind 3 to 6 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

    High: 68 °F

    Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain before 1am. Mostly cloudy, with a low around 53. Calm wind.

    Low: 53 °F

    Chance Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 60. Southwest wind around 6 mph.
Thursday
A slight chance of rain between 10am and 1pm. Mostly cloudy, with a high near 69. South wind 7 to 13 mph. Chance of precipitation is 20%.
Thursday Night
Rain likely, mainly after 1am. Mostly cloudy, with a steady temperature around 63. Southwest wind 6 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain and possibly a thunderstorm. High near 68. Southwest wind 3 to 6 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Friday Night
A 50 percent chance of rain before 1am. Mostly cloudy, with a low around 53. Calm wind.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 43.
Sunday
Mostly sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 41.
Monday
Sunny, with a high near 58.
Monday Night
Mostly clear, with a low around 40.
Tuesday
Sunny, with a high near 60.
Tuesday Night
Mostly clear, with a low around 40.
Veterans Day
Sunny, with a high near 58.
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Forecast Area
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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:
8:57 pm EST Nov 4, 2026
Forecast Valid:
9pm EST Nov 4, 2026-6pm EST Nov 11, 2026
 
Forecast Discussion
 
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Additional Resources

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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