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.

A Few Clouds

37°F

3°C

Humidity 96%
Wind Speed Calm
Barometer 29.99 in (1015.7 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 9 Mar 6:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Patchy fog between 8am and 9am. Otherwise, sunny, with a high near 62. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 62 °F

    Patchy Fog
    then Sunny

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, increasing clouds, with a low around 38. Light southwest wind.

    Low: 38 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 60. Calm wind becoming south around 6 mph in the afternoon.

    High: 60 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog. Otherwise, mostly cloudy, with a low around 40. Calm wind.

    Low: 40 °F

    Patchy Fog

  • Wednesday

    Wednesday: A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 54. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 54 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Chance Rain

  • Thursday

    Thursday: Rain likely before 2pm, then a chance of rain and snow. Mostly cloudy, with a high near 55. Chance of precipitation is 60%.

    High: 55 °F

    Rain Likely
    then
    Rain/Snow
    Likely

  • Thursday Night

    Thursday Night: A chance of rain and snow before 8pm. Partly cloudy, with a low around 29. Chance of precipitation is 30%.

    Low: 29 °F

    Chance
    Rain/Snow
    then Mostly
    Clear

  • Friday

    Friday: Partly sunny, with a high near 44.

    High: 44 °F

    Partly Sunny

Detailed Forecast

Today
Patchy fog between 8am and 9am. Otherwise, sunny, with a high near 62. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Tonight
Patchy fog after 2am. Otherwise, increasing clouds, with a low around 38. Light southwest wind.
Tuesday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 60. Calm wind becoming south around 6 mph in the afternoon.
Tuesday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 40. Calm wind.
Wednesday
A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 54. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 46.
Thursday
Rain likely before 2pm, then a chance of rain and snow. Mostly cloudy, with a high near 55. Chance of precipitation is 60%.
Thursday Night
A chance of rain and snow before 8pm. Partly cloudy, with a low around 29. Chance of precipitation is 30%.
Friday
Partly sunny, with a high near 44.
Friday Night
A chance of rain between 8pm and 2am. Mostly cloudy, with a low around 34. Chance of precipitation is 40%.
Saturday
Mostly sunny, with a high near 47.
Saturday Night
Mostly cloudy, with a low around 32.
Sunday
A 30 percent chance of rain. Cloudy, with a high near 48.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
6:00 am EDT Mar 9, 2026
Forecast Valid:
7am EDT Mar 9, 2026-6pm EDT Mar 15, 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