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.

Mostly Cloudy

77°F

25°C

Humidity 66%
Wind Speed SW 13 mph
Barometer 29.88 in (1011.7 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 2 Oct 1:56 pm EDT
Extended Forecast for

Nesconset NY

  • This Afternoon

    This Afternoon: Mostly sunny, with a steady temperature around 78. Southwest wind around 11 mph.

    High: 78 °F

    Mostly Sunny

  • Tonight

    Tonight: Showers likely, mainly before 11pm. Mostly cloudy, with a low around 58. North wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 58 °F

    Showers
    Likely then
    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 68. North wind 7 to 9 mph.

    High: 68 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 55. East wind 3 to 5 mph.

    Low: 55 °F

    Mostly Clear

  • Sunday

    Sunday: A 40 percent chance of showers after 2pm. Partly sunny, with a high near 64. East wind 8 to 10 mph.

    High: 64 °F

    Partly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 55.

    Low: 55 °F

    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a steady temperature around 78. Southwest wind around 11 mph.
Tonight
Showers likely, mainly before 11pm. Mostly cloudy, with a low around 58. North wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
Mostly sunny, with a high near 68. North wind 7 to 9 mph.
Saturday Night
Mostly clear, with a low around 55. East wind 3 to 5 mph.
Sunday
A 40 percent chance of showers after 2pm. Partly sunny, with a high near 64. East wind 8 to 10 mph.
Sunday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 55.
Monday
Mostly sunny, with a high near 68.
Monday Night
Mostly clear, with a low around 47.
Tuesday
Sunny, with a high near 59.
Tuesday Night
Mostly clear, with a low around 46.
Wednesday
Sunny, with a high near 60.
Wednesday Night
Mostly clear, with a low around 51.
Thursday
Sunny, with a high near 65.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Nesconset NY
 40.86°N 73.16°W (Elev. 98 ft)
Last Update:
10:17 am EDT Oct 2, 2026
Forecast Valid:
2pm EDT Oct 2, 2026-6pm EDT Oct 8, 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