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

50°F

10°C

Humidity 63%
Wind Speed NW 18 G 31 mph
Barometer 29.78 in (1008.2 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 7 Nov 11:56 pm EST
Extended Forecast for

Smithtown NY

  • Overnight

    Overnight: A slight chance of showers between 1am and 4am. Partly cloudy, with a low around 43. West wind around 16 mph. Chance of precipitation is 20%.

    Low: 43 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 62. West wind 11 to 17 mph, with gusts as high as 28 mph.

    High: 62 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 43. West wind 11 to 14 mph.

    Low: 43 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 58. West wind 11 to 16 mph, with gusts as high as 28 mph.

    High: 58 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 39. Northwest wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 39 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Veterans Day

    Veterans Day: Sunny, with a high near 60.

    High: 60 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

Detailed Forecast

Overnight
A slight chance of showers between 1am and 4am. Partly cloudy, with a low around 43. West wind around 16 mph. Chance of precipitation is 20%.
Sunday
Sunny, with a high near 62. West wind 11 to 17 mph, with gusts as high as 28 mph.
Sunday Night
Mostly clear, with a low around 43. West wind 11 to 14 mph.
Monday
Mostly sunny, with a high near 58. West wind 11 to 16 mph, with gusts as high as 28 mph.
Monday Night
Mostly clear, with a low around 39. Northwest wind 7 to 11 mph, with gusts as high as 21 mph.
Tuesday
Mostly sunny, with a high near 60.
Tuesday Night
Mostly clear, with a low around 42.
Veterans Day
Sunny, with a high near 60.
Wednesday Night
Partly cloudy, with a low around 39.
Thursday
A 30 percent chance of rain after 1pm. Partly sunny, with a high near 57.
Thursday Night
Rain likely. Mostly cloudy, with a low around 36. Chance of precipitation is 60%.
Friday
Rain likely. Partly sunny, with a high near 51. Breezy. Chance of precipitation is 60%.
Friday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 32.
Saturday
Mostly sunny, with a high near 50.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Smithtown NY
 40.86°N 73.22°W (Elev. 82 ft)
Last Update:
4:00 pm EST Nov 7, 2026
Forecast Valid:
12am EST Nov 8, 2026-6pm EST Nov 14, 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