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.

Overcast

24°F

-4°C

Humidity 77%
Wind Speed Calm
Barometer 30.61 in (1036.5 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Last update 3 Mar 2:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Mostly cloudy, with a steady temperature around 24. Calm wind.

    Low: 24 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of snow between 7am and 9am, then rain. High near 40. East wind 3 to 8 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.

    High: 40 °F

    Rain/Snow
    then Rain

  • Tuesday Night

    Tuesday Night: Rain, mainly before 4am. Low around 35. Calm wind becoming southwest around 5 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 35 °F

    Rain

  • Wednesday

    Wednesday: Partly sunny, with a high near 46. Light and variable wind.

    High: 46 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 34. Calm wind.

    Low: 34 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday

    Thursday: Rain likely, mainly before 1pm. Cloudy, with a high near 45. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 45 °F

    Rain Likely

  • Thursday Night

    Thursday Night: Rain likely. Cloudy, with a low around 36. Chance of precipitation is 60%.

    Low: 36 °F

    Rain Likely

  • Friday

    Friday: A 50 percent chance of rain before 1pm. Cloudy, with a high near 43.

    High: 43 °F

    Chance Rain

  • Friday Night

    Friday Night: Cloudy, with a low around 34.

    Low: 34 °F

    Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a steady temperature around 24. Calm wind.
Tuesday
A chance of snow between 7am and 9am, then rain. High near 40. East wind 3 to 8 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.
Tuesday Night
Rain, mainly before 4am. Low around 35. Calm wind becoming southwest around 5 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Partly sunny, with a high near 46. Light and variable wind.
Wednesday Night
A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 34. Calm wind.
Thursday
Rain likely, mainly before 1pm. Cloudy, with a high near 45. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
Rain likely. Cloudy, with a low around 36. Chance of precipitation is 60%.
Friday
A 50 percent chance of rain before 1pm. Cloudy, with a high near 43.
Friday Night
Cloudy, with a low around 34.
Saturday
Cloudy, with a high near 50.
Saturday Night
Rain likely. Cloudy, with a low around 42. Chance of precipitation is 60%.
Sunday
Mostly cloudy, with a high near 56.
Sunday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 42.
Monday
Mostly cloudy, with a high near 56.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
12:43 am EST Mar 3, 2026
Forecast Valid:
3am EST Mar 3, 2026-6pm EDT Mar 9, 2026
 
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