National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fair

50°F

10°C

Humidity 52%
Wind Speed NW 13 G 26 mph
Barometer 29.84 in (1010.6 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 6 Nov 4:56 am EST
Extended Forecast for

Smithtown NY

Frost Advisory November 7, 12:00am until November 7, 07:00am
Click here for hazard details and duration
Frost Advisory

  • Today

    Today: Sunny, with a high near 53. Northwest wind 14 to 17 mph, with gusts as high as 32 mph.

    High: 53 °F

    Sunny

  • Tonight

    Tonight: Areas of frost after 3am. Otherwise, mostly clear, with a low around 34. Northwest wind 5 to 8 mph becoming calm after midnight.

    Low: 34 °F

    Mostly Clear
    then Areas
    Frost

  • Friday

    Friday: Areas of frost before 8am. Otherwise, partly sunny, with a high near 60. Light south wind increasing to 12 to 17 mph in the morning. Winds could gust as high as 30 mph.

    High: 60 °F

    Areas Frost
    then Partly
    Sunny

  • Friday Night

    Friday Night: Showers likely. Cloudy, with a low around 51. South wind 9 to 14 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 51 °F

    Showers
    Likely

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 65. West wind 7 to 9 mph.

    High: 65 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 48.

    Low: 48 °F

    Partly Cloudy

  • Sunday

    Sunday: Rain likely. Mostly cloudy, with a high near 63. Chance of precipitation is 70%.

    High: 63 °F

    Rain Likely

  • Sunday Night

    Sunday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 40.

    Low: 40 °F

    Chance
    Showers

  • Monday

    Monday: Partly sunny, with a high near 50.

    High: 50 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 53. Northwest wind 14 to 17 mph, with gusts as high as 32 mph.
Tonight
Areas of frost after 3am. Otherwise, mostly clear, with a low around 34. Northwest wind 5 to 8 mph becoming calm after midnight.
Friday
Areas of frost before 8am. Otherwise, partly sunny, with a high near 60. Light south wind increasing to 12 to 17 mph in the morning. Winds could gust as high as 30 mph.
Friday Night
Showers likely. Cloudy, with a low around 51. South wind 9 to 14 mph, with gusts as high as 29 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 65. West wind 7 to 9 mph.
Saturday Night
Partly cloudy, with a low around 48.
Sunday
Rain likely. Mostly cloudy, with a high near 63. Chance of precipitation is 70%.
Sunday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 40.
Monday
Partly sunny, with a high near 50.
Monday Night
Partly cloudy, with a low around 31.
Veterans Day
Mostly sunny, with a high near 47.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
Partly sunny, with a high near 53.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Smithtown NY
 40.86°N 73.19°W (Elev. 98 ft)
Last Update:
5:09 am EST Nov 6, 2025
Forecast Valid:
5am EST Nov 6, 2025-6pm EST Nov 12, 2025
 
Forecast Discussion
 
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Additional Resources

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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