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

34°F

1°C

Humidity 38%
Wind Speed N 5 mph
Barometer 30.33 in (1027.0 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 1 Mar 6:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly clear, with a low around 17. Wind chill values between 5 and 10. North wind 8 to 10 mph.

    Low: 17 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 29. Wind chill values between 10 and 20. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 29 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 21. Calm wind.

    Low: 21 °F

    Mostly Clear

  • Tuesday

    Tuesday: Rain likely, possibly mixed with snow before 1pm, then rain. High near 41. Southeast wind 3 to 7 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    High: 41 °F

    Rain/Snow
    Likely then
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Rain. Low around 35. South wind around 7 mph becoming west after midnight. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 35 °F

    Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 45.

    High: 45 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Cloudy, with a low around 36.

    Low: 36 °F

    Chance Rain

  • Thursday

    Thursday: A 40 percent chance of rain. Cloudy, with a high near 49.

    High: 49 °F

    Chance Rain

  • Thursday Night

    Thursday Night: A 50 percent chance of rain. Cloudy, with a low around 37.

    Low: 37 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly clear, with a low around 17. Wind chill values between 5 and 10. North wind 8 to 10 mph.
Monday
Mostly sunny, with a high near 29. Wind chill values between 10 and 20. North wind 5 to 7 mph becoming calm in the afternoon.
Monday Night
Mostly clear, with a low around 21. Calm wind.
Tuesday
Rain likely, possibly mixed with snow before 1pm, then rain. High near 41. Southeast wind 3 to 7 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Tuesday Night
Rain. Low around 35. South wind around 7 mph becoming west after midnight. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Mostly cloudy, with a high near 45.
Wednesday Night
A 50 percent chance of rain. Cloudy, with a low around 36.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 49.
Thursday Night
A 50 percent chance of rain. Cloudy, with a low around 37.
Friday
A 40 percent chance of rain before 1pm. Cloudy, with a high near 46.
Friday Night
Cloudy, with a low around 36.
Saturday
Cloudy, with a high near 51.
Saturday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 40.
Sunday
Mostly cloudy, with a high near 52.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
6:17 pm EST Mar 1, 2026
Forecast Valid:
7pm EST Mar 1, 2026-6pm EDT Mar 8, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation