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.

Fair

41°F

5°C

Humidity 55%
Wind Speed N 6 mph
Barometer 30.44 in (1030.7 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 12 Apr 3:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Increasing clouds, with a high near 54. North wind 6 to 11 mph becoming south in the afternoon.

    High: 54 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, with a low around 43. South wind 6 to 10 mph.

    Low: 43 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 69. Southwest wind 10 to 15 mph, with gusts as high as 29 mph.

    High: 69 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 52. Southwest wind 6 to 10 mph, with gusts as high as 24 mph.

    Low: 52 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 75. Southwest wind 5 to 10 mph.

    High: 75 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 56.

    Low: 56 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers between 8pm and midnight. Mostly cloudy, with a low around 57. Chance of precipitation is 30%.

    Low: 57 °F

    Chance
    Showers then
    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 76.

    High: 76 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 54. North wind 6 to 11 mph becoming south in the afternoon.
Tonight
Mostly cloudy, with a low around 43. South wind 6 to 10 mph.
Monday
A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 69. Southwest wind 10 to 15 mph, with gusts as high as 29 mph.
Monday Night
Partly cloudy, with a low around 52. Southwest wind 6 to 10 mph, with gusts as high as 24 mph.
Tuesday
Mostly sunny, with a high near 75. Southwest wind 5 to 10 mph.
Tuesday Night
Mostly cloudy, with a low around 56.
Wednesday
Mostly sunny, with a high near 80.
Wednesday Night
A chance of showers between 8pm and midnight. Mostly cloudy, with a low around 57. Chance of precipitation is 30%.
Thursday
Partly sunny, with a high near 76.
Thursday Night
Mostly cloudy, with a low around 56.
Friday
Mostly sunny, with a high near 71.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 66.
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Forecast Area
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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:
4:15 am EDT Apr 12, 2026
Forecast Valid:
4am EDT Apr 12, 2026-6pm EDT Apr 18, 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