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

42°F

6°C

Humidity 82%
Wind Speed E 13 G 24 mph
Barometer 30.45 in (1031.0 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 2 Apr 5:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: A chance of drizzle or light rain, mainly after midnight. Patchy fog after 10pm. Otherwise, cloudy, with a low around 40. East wind 7 to 11 mph. Chance of precipitation is 30%.

    Low: 40 °F

    Chance Light
    Rain and
    Patchy Fog

  • Friday

    Friday: Areas of fog before noon. Otherwise, mostly cloudy, with a high near 60. Light and variable wind becoming southwest 8 to 13 mph in the morning.

    High: 60 °F

    Areas Fog
    then Partly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 50. Southwest wind 8 to 13 mph.

    Low: 50 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers, mainly after 2pm. Partly sunny, with a high near 62. West wind 5 to 13 mph becoming east in the afternoon.

    High: 62 °F

    Partly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 44. East wind 9 to 13 mph.

    Low: 44 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers. High near 60. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 60 °F

    Showers
    Likely then
    Showers

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 40.

    Low: 40 °F

    Chance
    Showers then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 37.

    Low: 37 °F

    Partly Cloudy

Detailed Forecast

Tonight
A chance of drizzle or light rain, mainly after midnight. Patchy fog after 10pm. Otherwise, cloudy, with a low around 40. East wind 7 to 11 mph. Chance of precipitation is 30%.
Friday
Areas of fog before noon. Otherwise, mostly cloudy, with a high near 60. Light and variable wind becoming southwest 8 to 13 mph in the morning.
Friday Night
Mostly cloudy, with a low around 50. Southwest wind 8 to 13 mph.
Saturday
A 30 percent chance of showers, mainly after 2pm. Partly sunny, with a high near 62. West wind 5 to 13 mph becoming east in the afternoon.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 44. East wind 9 to 13 mph.
Sunday
Showers. High near 60. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 30 percent chance of showers before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 40.
Monday
Mostly sunny, with a high near 52.
Monday Night
Partly cloudy, with a low around 37.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Partly cloudy, with a low around 32.
Wednesday
Sunny, with a high near 48.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
Mostly sunny, with a high near 53.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
2:27 pm EDT Apr 2, 2026
Forecast Valid:
6pm EDT Apr 2, 2026-6pm EDT Apr 9, 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