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

29°F

-2°C

Humidity 82%
Wind Speed SE 3 mph
Barometer 30.16 in (1021.4 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Last update 27 Feb 8:56 pm EST
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Patchy fog after 11pm. Otherwise, mostly clear, with a low around 30. Calm wind.

    Low: 30 °F

    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 45. Calm wind becoming southwest around 5 mph.

    High: 45 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Patchy fog between 10pm and 2am. Otherwise, partly cloudy, with a low around 29. Calm wind.

    Low: 29 °F

    Patchy Fog

  • Sunday

    Sunday: A slight chance of rain and snow showers before 10am, then snow showers likely. Cloudy, then gradually becoming mostly sunny, with a high near 39. Calm wind becoming north 5 to 8 mph in the morning. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 39 °F

    Rain/Snow
    Likely then
    Snow Showers
    Likely

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 17. North wind around 7 mph.

    Low: 17 °F

    Mostly Clear

  • Monday

    Monday: Partly sunny, with a high near 29.

    High: 29 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 20.

    Low: 20 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of rain and snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 41. Chance of precipitation is 50%.

    High: 41 °F

    Chance
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Rain likely. Cloudy, with a low around 36. Chance of precipitation is 70%.

    Low: 36 °F

    Rain Likely

Detailed Forecast

Tonight
Patchy fog after 11pm. Otherwise, mostly clear, with a low around 30. Calm wind.
Saturday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 45. Calm wind becoming southwest around 5 mph.
Saturday Night
Patchy fog between 10pm and 2am. Otherwise, partly cloudy, with a low around 29. Calm wind.
Sunday
A slight chance of rain and snow showers before 10am, then snow showers likely. Cloudy, then gradually becoming mostly sunny, with a high near 39. Calm wind becoming north 5 to 8 mph in the morning. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday Night
Mostly clear, with a low around 17. North wind around 7 mph.
Monday
Partly sunny, with a high near 29.
Monday Night
Partly cloudy, with a low around 20.
Tuesday
A chance of rain and snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 41. Chance of precipitation is 50%.
Tuesday Night
Rain likely. Cloudy, with a low around 36. Chance of precipitation is 70%.
Wednesday
A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 46.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 34.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 45.
Thursday Night
Rain likely. Cloudy, with a low around 34. Chance of precipitation is 60%.
Friday
A 40 percent chance of rain. Cloudy, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
8:51 pm EST Feb 27, 2026
Forecast Valid:
9pm EST Feb 27, 2026-6pm EST Mar 6, 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