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

64°F

18°C

Humidity 45%
Wind Speed SW 12 mph
Barometer 29.98 in (1015.2 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 9 Mar 4:56 pm EDT
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 38. South wind around 5 mph becoming calm in the evening.

    Low: 38 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 65. Calm wind becoming south around 6 mph in the afternoon.

    High: 65 °F

    Patchy Fog
    then Partly
    Sunny

  • Tuesday Night

    Tuesday Night: Patchy fog. Otherwise, mostly cloudy, with a low around 39. Calm wind.

    Low: 39 °F

    Patchy Fog

  • Wednesday

    Wednesday: A 20 percent chance of showers. Mostly cloudy, with a high near 59. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 59 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 46. South wind around 10 mph, with gusts as high as 24 mph.

    Low: 46 °F

    Chance
    Showers

  • Thursday

    Thursday: Rain likely, mainly before 2pm. Cloudy, with a temperature rising to near 51 by 10am, then falling to around 45 during the remainder of the day. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 51 °F⇓

    Rain Likely

  • Thursday Night

    Thursday Night: A 30 percent chance of rain before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 29.

    Low: 29 °F

    Chance Rain
    then Partly
    Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 44.

    High: 44 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of rain before 2am. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain

Detailed Forecast

Tonight
Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 38. South wind around 5 mph becoming calm in the evening.
Tuesday
Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 65. Calm wind becoming south around 6 mph in the afternoon.
Tuesday Night
Patchy fog. Otherwise, mostly cloudy, with a low around 39. Calm wind.
Wednesday
A 20 percent chance of showers. Mostly cloudy, with a high near 59. 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 showers. Mostly cloudy, with a low around 46. South wind around 10 mph, with gusts as high as 24 mph.
Thursday
Rain likely, mainly before 2pm. Cloudy, with a temperature rising to near 51 by 10am, then falling to around 45 during the remainder of the day. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A 30 percent chance of rain before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 29.
Friday
Mostly sunny, with a high near 44.
Friday Night
A 30 percent chance of rain before 2am. Mostly cloudy, with a low around 35.
Saturday
Partly sunny, with a high near 47.
Saturday Night
Mostly cloudy, with a low around 33.
Sunday
Cloudy, with a high near 50.
Sunday Night
Rain likely. Mostly cloudy, with a low around 38. Chance of precipitation is 60%.
Monday
Rain likely. Cloudy, with a high near 49. Chance of precipitation is 60%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.74°N 73.16°W (Elev. 7 ft)
Last Update:
2:19 pm EDT Mar 9, 2026
Forecast Valid:
5pm EDT Mar 9, 2026-6pm EDT Mar 16, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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