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

73°F

23°C

Humidity 90%
Wind Speed SW 13 G 22 mph
Barometer 29.60 in (1002.3 mb)
Dewpoint 70°F (21°C)
Visibility 9.00 mi
Last update 24 Jun 12:56 am EDT
Extended Forecast for

Smithtown NY

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Southwest wind 15 to 17 mph.

    Low: 73 °F

    Slight Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 85. West wind 13 to 15 mph.

    High: 85 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67. Northwest wind 10 to 13 mph.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 89. Northwest wind around 8 mph.

    High: 89 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 71. Southwest wind around 9 mph.

    Low: 71 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 70. Chance of precipitation is 70%.

    Low: 70 °F

    Showers
    Likely

  • Thursday

    Thursday: A 30 percent chance of showers before 2pm. Mostly sunny, with a high near 85.

    High: 85 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Southwest wind 15 to 17 mph.
Monday
Mostly sunny, with a high near 85. West wind 13 to 15 mph.
Monday Night
Mostly clear, with a low around 67. Northwest wind 10 to 13 mph.
Tuesday
Sunny, with a high near 89. Northwest wind around 8 mph.
Tuesday Night
Partly cloudy, with a low around 71. Southwest wind around 9 mph.
Wednesday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 88.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 8pm. Mostly cloudy, with a low around 70. Chance of precipitation is 70%.
Thursday
A 30 percent chance of showers before 2pm. Mostly sunny, with a high near 85.
Thursday Night
Mostly clear, with a low around 64.
Friday
Sunny, with a high near 81.
Friday Night
Partly cloudy, with a low around 64.
Saturday
Mostly sunny, with a high near 81.
Saturday Night
Mostly cloudy, with a low around 68.
Sunday
A 40 percent chance of showers. Partly sunny, with a high near 85.
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ABOUT THIS FORECAST

 
Point Forecast:
Smithtown NY
 40.86°N 73.19°W (Elev. 98 ft)
Last Update:
10:20 pm EDT Jun 23, 2024
Forecast Valid:
1am EDT Jun 24, 2024-6pm EDT Jun 30, 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