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

38°F

3°C

Humidity 83%
Wind Speed SW 9 mph
Barometer 30.14 in (1020.5 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 20 Mar 3:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: A 30 percent chance of rain after 5pm. Mostly sunny, with a high near 50. Light southwest wind becoming south 11 to 16 mph in the morning.

    High: 50 °F

    Mostly Sunny
    then Chance
    Rain

  • Tonight

    Tonight: Rain, mainly before 2am. Low around 40. Southwest wind 10 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 40 °F

    Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 53. Northwest wind around 10 mph.

    High: 53 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 37. North wind around 5 mph becoming light and variable in the evening.

    Low: 37 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 20 percent chance of rain after 2pm. Mostly cloudy, with a high near 53. South wind 6 to 13 mph.

    High: 53 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Sunday Night

    Sunday Night: Rain likely, mainly after 2am. Cloudy, with a low around 40. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F

    Rain Likely

  • Monday

    Monday: Rain likely, mainly before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 47. Chance of precipitation is 60%.

    High: 47 °F

    Rain Likely

  • Monday Night

    Monday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 44.

    High: 44 °F

    Sunny

Detailed Forecast

Today
A 30 percent chance of rain after 5pm. Mostly sunny, with a high near 50. Light southwest wind becoming south 11 to 16 mph in the morning.
Tonight
Rain, mainly before 2am. Low around 40. Southwest wind 10 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Mostly sunny, with a high near 53. Northwest wind around 10 mph.
Saturday Night
Mostly cloudy, with a low around 37. North wind around 5 mph becoming light and variable in the evening.
Sunday
A 20 percent chance of rain after 2pm. Mostly cloudy, with a high near 53. South wind 6 to 13 mph.
Sunday Night
Rain likely, mainly after 2am. Cloudy, with a low around 40. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Rain likely, mainly before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 47. Chance of precipitation is 60%.
Monday Night
Partly cloudy, with a low around 28.
Tuesday
Sunny, with a high near 44.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
Partly sunny, with a high near 48.
Wednesday Night
Mostly cloudy, with a low around 32.
Thursday
A 30 percent chance of rain. Partly sunny, with a high near 48.
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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:
2:26 am EDT Mar 20, 2026
Forecast Valid:
4am EDT Mar 20, 2026-6pm EDT Mar 26, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation