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

50°F

10°C

Humidity 57%
Wind Speed S 13 mph
Barometer 30.31 in (1026.4 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 13 Apr 12:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 46. South wind around 7 mph.

    Low: 46 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 69. Southwest wind 10 to 17 mph, with gusts as high as 31 mph.

    High: 69 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly clear, with a low around 53. West wind 5 to 10 mph, with gusts as high as 21 mph.

    Low: 53 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 73. Calm wind becoming south 5 to 8 mph in the morning.

    High: 73 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 54. Southwest wind 5 to 8 mph.

    Low: 54 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 55. Chance of precipitation is 40%.

    Low: 55 °F

    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 46. South wind around 7 mph.
Monday
Mostly cloudy, with a high near 69. Southwest wind 10 to 17 mph, with gusts as high as 31 mph.
Monday Night
Mostly clear, with a low around 53. West wind 5 to 10 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 73. Calm wind becoming south 5 to 8 mph in the morning.
Tuesday Night
A 20 percent chance of showers before 2am. Mostly cloudy, with a low around 54. Southwest wind 5 to 8 mph.
Wednesday
Mostly sunny, with a high near 76.
Wednesday Night
A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 55. Chance of precipitation is 40%.
Thursday
Partly sunny, with a high near 72.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
Mostly sunny, with a high near 71.
Friday Night
Partly cloudy, with a low around 51.
Saturday
Mostly sunny, with a high near 65.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 50.
Sunday
A 40 percent chance of showers. Mostly cloudy, with a high near 65.
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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:
1:48 am EDT Apr 13, 2026
Forecast Valid:
1am EDT Apr 13, 2026-6pm EDT Apr 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation