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

49°F

9°C

Humidity 74%
Wind Speed SE 12 mph
Barometer 30.01 in (1016.4 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 22 Apr 4:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly cloudy, with a low around 42. Southeast wind 5 to 8 mph becoming calm in the evening.

    Low: 42 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 68. Light northwest wind increasing to 5 to 10 mph in the morning.

    High: 68 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 47. North wind around 5 mph.

    Low: 47 °F

    Increasing
    Clouds

  • Friday

    Friday: Partly sunny, with a high near 59. North wind around 6 mph becoming west in the afternoon.

    High: 59 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers after 2am. Partly cloudy, with a low around 43. Light south wind.

    Low: 43 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers after 8am. Mostly cloudy, with a high near 51.

    High: 51 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 50 percent chance of showers. Cloudy, with a low around 42.

    Low: 42 °F

    Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers before 2pm. Mostly cloudy, with a high near 56.

    High: 56 °F

    Chance
    Showers

  • Sunday Night

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

    Low: 43 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 42. Southeast wind 5 to 8 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 68. Light northwest wind increasing to 5 to 10 mph in the morning.
Thursday Night
Increasing clouds, with a low around 47. North wind around 5 mph.
Friday
Partly sunny, with a high near 59. North wind around 6 mph becoming west in the afternoon.
Friday Night
A 20 percent chance of showers after 2am. Partly cloudy, with a low around 43. Light south wind.
Saturday
A 50 percent chance of showers after 8am. Mostly cloudy, with a high near 51.
Saturday Night
A 50 percent chance of showers. Cloudy, with a low around 42.
Sunday
A 30 percent chance of showers before 2pm. Mostly cloudy, with a high near 56.
Sunday Night
Partly cloudy, with a low around 43.
Monday
Mostly sunny, with a high near 59.
Monday Night
Mostly cloudy, with a low around 44.
Tuesday
A 50 percent chance of showers. Mostly cloudy, with a high near 58.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 46. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers. Mostly cloudy, with a high near 57.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
1:39 pm EDT Apr 22, 2026
Forecast Valid:
5pm EDT Apr 22, 2026-6pm EDT Apr 29, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation