National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fog/Mist

25°F

-4°C

Humidity 88%
Wind Speed Calm
Barometer 30.03 in (1017.0 mb)
Dewpoint 22°F (-6°C)
Visibility 6.00 mi
Last update 15 Feb 2:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Partly cloudy, with a low around 28. Calm wind.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 38. Calm wind becoming northeast 5 to 8 mph in the morning.

    High: 38 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Snow, mainly after 10pm. Low around 28. Northeast wind 7 to 9 mph. Chance of precipitation is 80%. New snow accumulation of around an inch possible.

    Low: 28 °F

    Chance Snow
    then Snow

  • Washington's Birthday

    Washington's Birthday: Snow likely before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 38. Wind chill values between 20 and 30. Northeast wind 6 to 11 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 38 °F

    Snow Likely
    then Partly
    Sunny

  • Monday Night

    Monday Night: A slight chance of rain and snow showers after 1am. Mostly cloudy, with a low around 29. Calm wind. Chance of precipitation is 20%.

    Low: 29 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Tuesday

    Tuesday: Cloudy through mid morning, then gradual clearing, with a high near 43.

    High: 43 °F

    Gradual
    Clearing

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 31.

    Low: 31 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Rain likely after 1pm. Cloudy, with a high near 42. Chance of precipitation is 60%.

    High: 42 °F

    Cloudy then
    Rain Likely

  • Wednesday Night

    Wednesday Night: Rain likely, mainly before 1am. Cloudy, with a low around 33. Chance of precipitation is 70%.

    Low: 33 °F

    Rain Likely

Detailed Forecast

Overnight
Partly cloudy, with a low around 28. Calm wind.
Sunday
Mostly cloudy, with a high near 38. Calm wind becoming northeast 5 to 8 mph in the morning.
Sunday Night
Snow, mainly after 10pm. Low around 28. Northeast wind 7 to 9 mph. Chance of precipitation is 80%. New snow accumulation of around an inch possible.
Washington's Birthday
Snow likely before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 38. Wind chill values between 20 and 30. Northeast wind 6 to 11 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Monday Night
A slight chance of rain and snow showers after 1am. Mostly cloudy, with a low around 29. Calm wind. Chance of precipitation is 20%.
Tuesday
Cloudy through mid morning, then gradual clearing, with a high near 43.
Tuesday Night
Increasing clouds, with a low around 31.
Wednesday
Rain likely after 1pm. Cloudy, with a high near 42. Chance of precipitation is 60%.
Wednesday Night
Rain likely, mainly before 1am. Cloudy, with a low around 33. Chance of precipitation is 70%.
Thursday
Mostly cloudy, with a high near 41.
Thursday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 30.
Friday
Rain likely. Mostly cloudy, with a high near 42. Chance of precipitation is 60%.
Friday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 31.
Saturday
A chance of rain and snow. Partly sunny, with a high near 41. Chance of precipitation is 40%.
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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:
1:46 am EST Feb 15, 2026
Forecast Valid:
3am EST Feb 15, 2026-6pm EST Feb 21, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation