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

52°F

11°C

Humidity 83%
Wind Speed SW 10 mph
Barometer 30.23 in (1023.7 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 3 Apr 12:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 60. Southwest wind 9 to 11 mph.

    High: 60 °F

    Mostly Cloudy

  • Tonight

    Tonight: Patchy fog between 3am and 5am. Otherwise, mostly cloudy, with a low around 50. Southwest wind 9 to 13 mph.

    Low: 50 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: A 20 percent chance of showers after 2pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 64. West wind 5 to 11 mph becoming east in the afternoon.

    High: 64 °F

    Patchy Fog
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 40 percent chance of showers, mainly after 8pm. Mostly cloudy, with a low around 43. East wind 9 to 13 mph.

    Low: 43 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers. High near 60. South wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 60 °F

    Showers

  • Sunday Night

    Sunday Night: Cloudy, then gradually becoming partly cloudy, with a low around 39.

    Low: 39 °F

    Decreasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 50.

    High: 50 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 60. Southwest wind 9 to 11 mph.
Tonight
Patchy fog between 3am and 5am. Otherwise, mostly cloudy, with a low around 50. Southwest wind 9 to 13 mph.
Saturday
A 20 percent chance of showers after 2pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 64. West wind 5 to 11 mph becoming east in the afternoon.
Saturday Night
A 40 percent chance of showers, mainly after 8pm. Mostly cloudy, with a low around 43. East wind 9 to 13 mph.
Sunday
Showers. High near 60. South wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
Cloudy, then gradually becoming partly cloudy, with a low around 39.
Monday
Mostly sunny, with a high near 52.
Monday Night
Partly cloudy, with a low around 38.
Tuesday
Partly sunny, with a high near 50.
Tuesday Night
Mostly clear, with a low around 32.
Wednesday
Sunny, with a high near 48.
Wednesday Night
Mostly clear, with a low around 37.
Thursday
Sunny, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
2:20 am EDT Apr 3, 2026
Forecast Valid:
1pm EDT Apr 3, 2026-6pm EDT Apr 9, 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