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

52°F

11°C

Humidity 97%
Wind Speed W 14 mph
Barometer 29.84 in (1010.5 mb)
Dewpoint 51°F (11°C)
Visibility 2.50 mi
Wind Chill47°F (8°C)
Last update 5 Apr 12:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Rain and possibly a thunderstorm. High near 57. Southwest wind around 15 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 57 °F

    Rain

  • Tonight

    Tonight: Rain likely before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 38. Southwest wind 6 to 8 mph becoming northwest after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 38 °F

    Rain Likely
    then Mostly
    Clear

  • Monday

    Monday: Sunny, with a high near 53. West wind around 10 mph, with gusts as high as 20 mph.

    High: 53 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of rain. Partly cloudy, with a low around 39. Southwest wind 3 to 5 mph.

    Low: 39 °F

    Slight Chance
    Rain

  • Tuesday

    Tuesday: Mostly sunny, with a high near 51. West wind 7 to 14 mph.

    High: 51 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 45.

    High: 45 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Rain and possibly a thunderstorm. High near 57. Southwest wind around 15 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Rain likely before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 38. Southwest wind 6 to 8 mph becoming northwest after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Sunny, with a high near 53. West wind around 10 mph, with gusts as high as 20 mph.
Monday Night
A 20 percent chance of rain. Partly cloudy, with a low around 39. Southwest wind 3 to 5 mph.
Tuesday
Mostly sunny, with a high near 51. West wind 7 to 14 mph.
Tuesday Night
Mostly clear, with a low around 30.
Wednesday
Sunny, with a high near 45.
Wednesday Night
Mostly clear, with a low around 35.
Thursday
Mostly sunny, with a high near 52.
Thursday Night
Partly cloudy, with a low around 42.
Friday
Mostly sunny, with a high near 60.
Friday Night
Partly cloudy, with a low around 45.
Saturday
Partly sunny, with a high near 59.
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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:
11:20 am EDT Apr 5, 2026
Forecast Valid:
12pm EDT Apr 5, 2026-6pm EDT Apr 11, 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