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.

Fog/Mist

43°F

6°C

Humidity 100%
Wind Speed Calm
Barometer 29.95 in (1014.1 mb)
Dewpoint 43°F (6°C)
Visibility 3.00 mi
Last update 23 Apr 6:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Patchy fog before 8am. Otherwise, sunny, with a high near 73. Light northwest wind increasing to 5 to 10 mph in the morning.

    High: 73 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 46. North wind 3 to 5 mph.

    Low: 46 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 61. Northeast wind around 6 mph becoming west in the afternoon.

    High: 61 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: A 20 percent chance of rain after 2am. Partly cloudy, with a low around 42. Calm wind.

    Low: 42 °F

    Partly Cloudy
    then Slight
    Chance Rain

  • Saturday

    Saturday: Rain likely, mainly after 2pm. Mostly cloudy, with a high near 51. East wind 6 to 10 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    High: 51 °F

    Rain Likely

  • Saturday Night

    Saturday Night: Rain likely, mainly before 2am. Cloudy, with a low around 41. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 41 °F

    Rain Likely

  • Sunday

    Sunday: A 30 percent chance of rain before 8am. Partly sunny, with a high near 56.

    High: 56 °F

    Chance Rain
    then Partly
    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

Detailed Forecast

Today
Patchy fog before 8am. Otherwise, sunny, with a high near 73. Light northwest wind increasing to 5 to 10 mph in the morning.
Tonight
Increasing clouds, with a low around 46. North wind 3 to 5 mph.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 61. Northeast wind around 6 mph becoming west in the afternoon.
Friday Night
A 20 percent chance of rain after 2am. Partly cloudy, with a low around 42. Calm wind.
Saturday
Rain likely, mainly after 2pm. Mostly cloudy, with a high near 51. East wind 6 to 10 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
Rain likely, mainly before 2am. Cloudy, with a low around 41. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Sunday
A 30 percent chance of rain before 8am. Partly sunny, with a high near 56.
Sunday Night
Partly cloudy, with a low around 44.
Monday
Mostly sunny, with a high near 60.
Monday Night
Mostly cloudy, with a low around 45.
Tuesday
Showers likely. Mostly cloudy, with a high near 58. Chance of precipitation is 60%.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 45. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers. Mostly cloudy, with a high near 58.
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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:
5:06 am EDT Apr 23, 2026
Forecast Valid:
7am EDT Apr 23, 2026-6pm EDT Apr 29, 2026
 
Forecast Discussion
 
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Additional Resources

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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