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.

Overcast

50°F

10°C

Humidity 71%
Wind Speed S 6 mph
Barometer 29.90 in (1012.6 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 12 May 8:56 am EDT
Extended Forecast for

Smithtown NY

  • Today

    Today: A 20 percent chance of showers. Mostly cloudy, with a high near 57. South wind around 6 mph.

    High: 57 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Mostly clear, with a low around 44. Southwest wind 3 to 6 mph.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 64. South wind 5 to 13 mph.

    High: 64 °F

    Sunny then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 52. South wind 8 to 11 mph.

    Low: 52 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 69. South wind 9 to 14 mph.

    High: 69 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers, mainly after 8pm. Low around 57. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 57 °F

    Showers

  • Wednesday

    Wednesday: Showers. High near 63. Chance of precipitation is 80%.

    High: 63 °F

    Showers

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 56.

    Low: 56 °F

    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 71.

    High: 71 °F

    Partly Sunny

Detailed Forecast

Today
A 20 percent chance of showers. Mostly cloudy, with a high near 57. South wind around 6 mph.
Tonight
Mostly clear, with a low around 44. Southwest wind 3 to 6 mph.
Monday
A 20 percent chance of showers after 2pm. Mostly sunny, with a high near 64. South wind 5 to 13 mph.
Monday Night
Mostly cloudy, with a low around 52. South wind 8 to 11 mph.
Tuesday
A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 69. South wind 9 to 14 mph.
Tuesday Night
Showers, mainly after 8pm. Low around 57. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Showers. High near 63. Chance of precipitation is 80%.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 56.
Thursday
Partly sunny, with a high near 71.
Thursday Night
Partly cloudy, with a low around 53.
Friday
Partly sunny, with a high near 71.
Friday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 54.
Saturday
A 40 percent chance of showers. Mostly cloudy, with a high near 66.
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ABOUT THIS FORECAST

 
Point Forecast:
Smithtown NY
 40.86°N 73.19°W (Elev. 98 ft)
Last Update:
7:52 am EDT May 12, 2024
Forecast Valid:
9am EDT May 12, 2024-6pm EDT May 18, 2024
 
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