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

40°F

4°C

Humidity 86%
Wind Speed Calm
Barometer 30.17 in (1021.7 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 19 Nov 6:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Rain likely, mainly before 10am. Mostly cloudy, with a high near 47. Calm wind becoming northeast 5 to 7 mph in the morning. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 47 °F

    Rain Likely
    then Slight
    Chance Rain

  • Tonight

    Tonight: Increasing clouds, with a low around 34. North wind 3 to 5 mph.

    Low: 34 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly sunny, with a high near 48. North wind 3 to 6 mph.

    High: 48 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 37. Calm wind.

    Low: 37 °F

    Increasing
    Clouds

  • Friday

    Friday: A 20 percent chance of rain after 1pm. Mostly cloudy, with a high near 54. Light southwest wind increasing to 5 to 10 mph in the morning.

    High: 54 °F

    Cloudy then
    Slight Chance
    Rain

  • Friday Night

    Friday Night: A 30 percent chance of rain. Mostly cloudy, with a low around 40.

    Low: 40 °F

    Chance Rain

  • Saturday

    Saturday: A 30 percent chance of rain before 1pm. Partly sunny, with a high near 53.

    High: 53 °F

    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 37.

    Low: 37 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

Detailed Forecast

Today
Rain likely, mainly before 10am. Mostly cloudy, with a high near 47. Calm wind becoming northeast 5 to 7 mph in the morning. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Increasing clouds, with a low around 34. North wind 3 to 5 mph.
Thursday
Mostly sunny, with a high near 48. North wind 3 to 6 mph.
Thursday Night
Increasing clouds, with a low around 37. Calm wind.
Friday
A 20 percent chance of rain after 1pm. Mostly cloudy, with a high near 54. Light southwest wind increasing to 5 to 10 mph in the morning.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 40.
Saturday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 53.
Saturday Night
Partly cloudy, with a low around 37.
Sunday
Mostly sunny, with a high near 51.
Sunday Night
Partly cloudy, with a low around 41.
Monday
Mostly sunny, with a high near 55.
Monday Night
Partly cloudy, with a low around 40.
Tuesday
Partly sunny, with a high near 53.
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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:
5:50 am EST Nov 19, 2025
Forecast Valid:
7am EST Nov 19, 2025-6pm EST Nov 25, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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