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.

Partly Cloudy

71°F

22°C

Humidity 96%
Wind Speed E 3 mph
Barometer 29.83 in (1010.2 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 17 Aug 11:56 pm EDT
Extended Forecast for

East Setauket NYSimilar City Names

  • Overnight

    Overnight: Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 70. Light north wind.

    Low: 70 °F

    Patchy Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 85. North wind around 6 mph becoming west in the afternoon.

    High: 85 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 68. Light northwest wind.

    Low: 68 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 86. Calm wind becoming west around 6 mph in the afternoon.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 71. South wind 6 to 8 mph.

    Low: 71 °F

    Partly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers before 2pm. Partly sunny, with a high near 81.

    High: 81 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers after 8pm. Mostly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    Showers

Detailed Forecast

Overnight
Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 70. Light north wind.
Tuesday
Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 85. North wind around 6 mph becoming west in the afternoon.
Tuesday Night
Mostly clear, with a low around 68. Light northwest wind.
Wednesday
Sunny, with a high near 86. Calm wind becoming west around 6 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 71. South wind 6 to 8 mph.
Thursday
A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 83.
Thursday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 67.
Friday
A 40 percent chance of showers before 2pm. Partly sunny, with a high near 81.
Friday Night
A 40 percent chance of showers after 8pm. Mostly cloudy, with a low around 67.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 79.
Saturday Night
Showers likely. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Sunday
Showers likely. Mostly cloudy, with a high near 80. Chance of precipitation is 60%.
Sunday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 67.
Monday
Mostly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
East Setauket NYSimilar City Names
 40.94°N 73.11°W (Elev. 52 ft)
Last Update:
4:44 pm EDT Aug 17, 2026
Forecast Valid:
12am EDT Aug 18, 2026-6pm EDT Aug 24, 2026
 
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