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.

Partly Cloudy

76°F

24°C

Humidity 47%
Wind Speed SE 14 mph
Barometer 30.05 in (1017.4 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 25 Jul 4:56 pm EDT
Extended Forecast for

Nesconset NY

  • Tonight

    Tonight: Mostly clear, with a low around 62. Southeast wind 5 to 8 mph becoming calm in the evening.

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 81. Light and variable wind becoming east 5 to 9 mph in the morning.

    High: 81 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63. South wind 5 to 7 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 82. Light south wind increasing to 5 to 10 mph in the afternoon.

    High: 82 °F

    Sunny

  • Monday Night

    Monday Night: A 30 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 68. South wind 6 to 8 mph.

    Low: 68 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Showers likely, then showers and possibly a thunderstorm after 2pm. High near 80. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 80 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 2am, then showers likely. Low around 67. Chance of precipitation is 80%.

    Low: 67 °F

    Showers

  • Wednesday

    Wednesday: Showers likely, mainly after 2pm. Partly sunny, with a high near 80. Chance of precipitation is 60%.

    High: 80 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely then
    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 62. Southeast wind 5 to 8 mph becoming calm in the evening.
Sunday
Sunny, with a high near 81. Light and variable wind becoming east 5 to 9 mph in the morning.
Sunday Night
Mostly clear, with a low around 63. South wind 5 to 7 mph becoming calm in the evening.
Monday
Sunny, with a high near 82. Light south wind increasing to 5 to 10 mph in the afternoon.
Monday Night
A 30 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 68. South wind 6 to 8 mph.
Tuesday
Showers likely, then showers and possibly a thunderstorm after 2pm. High near 80. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
Showers and possibly a thunderstorm before 2am, then showers likely. Low around 67. Chance of precipitation is 80%.
Wednesday
Showers likely, mainly after 2pm. Partly sunny, with a high near 80. Chance of precipitation is 60%.
Wednesday Night
Showers likely, mainly before 8pm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
Partly cloudy, with a low around 67.
Friday
Mostly sunny, with a high near 84.
Friday Night
Partly cloudy, with a low around 68.
Saturday
Mostly sunny, with a high near 85.
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:
2:21 pm EDT Jul 25, 2026
Forecast Valid:
5pm EDT Jul 25, 2026-6pm EDT Aug 1, 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