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

41°F

5°C

Humidity 55%
Wind Speed N 9 mph
Barometer 30.00 in (1015.8 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 26 Mar 7:56 am EDT
Extended Forecast for

Smithtown NY

  • Today

    Today: A 20 percent chance of showers after 2pm. Partly sunny, with a high near 51. Light and variable wind becoming west 5 to 9 mph in the afternoon.

    High: 51 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Tonight

    Tonight: A 20 percent chance of showers before 10pm. Mostly cloudy, then gradually becoming clear, with a low around 32. Northwest wind around 11 mph.

    Low: 32 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 51. Wind chill values between 25 and 35 early. West wind 10 to 13 mph.

    High: 51 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 38. Southwest wind 7 to 9 mph.

    Low: 38 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 58. West wind around 9 mph.

    High: 58 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 67.

    High: 67 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Chance
    Showers

  • Sunday

    Sunday: A 40 percent chance of showers. Mostly cloudy, with a high near 59.

    High: 59 °F

    Chance
    Showers

Detailed Forecast

Today
A 20 percent chance of showers after 2pm. Partly sunny, with a high near 51. Light and variable wind becoming west 5 to 9 mph in the afternoon.
Tonight
A 20 percent chance of showers before 10pm. Mostly cloudy, then gradually becoming clear, with a low around 32. Northwest wind around 11 mph.
Thursday
Sunny, with a high near 51. Wind chill values between 25 and 35 early. West wind 10 to 13 mph.
Thursday Night
Partly cloudy, with a low around 38. Southwest wind 7 to 9 mph.
Friday
Mostly sunny, with a high near 58. West wind around 9 mph.
Friday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 44.
Saturday
Partly sunny, with a high near 67.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 47.
Sunday
A 40 percent chance of showers. Mostly cloudy, with a high near 59.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 46.
Monday
A 50 percent chance of showers. Mostly cloudy, with a high near 60.
Monday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 36.
Tuesday
Partly sunny, with a high near 49.
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ABOUT THIS FORECAST

 
Point Forecast:
Smithtown NY
 40.86°N 73.19°W (Elev. 98 ft)
Last Update:
6:01 am EDT Mar 26, 2025
Forecast Valid:
8am EDT Mar 26, 2025-6pm EDT Apr 1, 2025
 
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