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.

Overcast

35°F

2°C

Humidity 67%
Wind Speed E 7 mph
Barometer 29.99 in (1015.7 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 19 Feb 5:56 am EST
Extended Forecast for

Islip Terrace NY

  • Today

    Today: Mostly cloudy, with a high near 41. East wind 6 to 8 mph.

    High: 41 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 50 percent chance of rain after 4am. Cloudy, with a low around 33. East wind 5 to 8 mph.

    Low: 33 °F

    Cloudy then
    Chance Rain

  • Friday

    Friday: Rain, mainly after 7am. High near 42. East wind 9 to 14 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 42 °F

    Rain

  • Friday Night

    Friday Night: A 50 percent chance of rain, mainly before 1am. Mostly cloudy, with a low around 32. Northeast wind 5 to 7 mph becoming light and variable after midnight.

    Low: 32 °F

    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain after 1pm. Mostly cloudy, with a high near 43. Light and variable wind becoming northwest 5 to 7 mph in the morning.

    High: 43 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: A chance of rain and snow before 10pm, then a chance of snow. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.

    Low: 28 °F

    Chance
    Rain/Snow
    then Chance
    Snow

  • Sunday

    Sunday: A 40 percent chance of snow. Mostly cloudy, with a high near 37.

    High: 37 °F

    Chance Snow

  • Sunday Night

    Sunday Night: A 50 percent chance of snow. Cloudy, with a low around 27.

    Low: 27 °F

    Chance Snow

  • Monday

    Monday: A 40 percent chance of snow before 1pm. Cloudy, with a high near 36.

    High: 36 °F

    Chance Snow

Detailed Forecast

Today
Mostly cloudy, with a high near 41. East wind 6 to 8 mph.
Tonight
A 50 percent chance of rain after 4am. Cloudy, with a low around 33. East wind 5 to 8 mph.
Friday
Rain, mainly after 7am. High near 42. East wind 9 to 14 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
A 50 percent chance of rain, mainly before 1am. Mostly cloudy, with a low around 32. Northeast wind 5 to 7 mph becoming light and variable after midnight.
Saturday
A 20 percent chance of rain after 1pm. Mostly cloudy, with a high near 43. Light and variable wind becoming northwest 5 to 7 mph in the morning.
Saturday Night
A chance of rain and snow before 10pm, then a chance of snow. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.
Sunday
A 40 percent chance of snow. Mostly cloudy, with a high near 37.
Sunday Night
A 50 percent chance of snow. Cloudy, with a low around 27.
Monday
A 40 percent chance of snow before 1pm. Cloudy, with a high near 36.
Monday Night
Mostly cloudy, with a low around 23.
Tuesday
Sunny, with a high near 35.
Tuesday Night
Partly cloudy, with a low around 22.
Wednesday
Mostly cloudy, with a high near 40.
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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:
6:14 am EST Feb 19, 2026
Forecast Valid:
6am EST Feb 19, 2026-6pm EST Feb 25, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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