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.

Light Drizzle Fog/Mist

75°F

24°C

Humidity 94%
Wind Speed N 9 mph
Barometer 29.79 in (1008.8 mb)
Dewpoint 73°F (23°C)
Visibility 4.00 mi
Last update 17 Aug 1:56 pm EDT
Extended Forecast for

Nissequogue NY

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 77. Northeast wind around 9 mph.

    High: 77 °F

    Mostly Cloudy

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 70. Northeast wind 3 to 6 mph.

    Low: 70 °F

    Mostly Cloudy
    then 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.

    High: 85 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 69. Light northwest wind.

    Low: 69 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 86. Calm wind becoming west 5 to 7 mph in the afternoon.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.

    Low: 66 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

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

    High: 81 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 77. Northeast wind around 9 mph.
Tonight
Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 70. Northeast wind 3 to 6 mph.
Tuesday
Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 85. North wind around 6 mph.
Tuesday Night
Mostly clear, with a low around 69. Light northwest wind.
Wednesday
Sunny, with a high near 86. Calm wind becoming west 5 to 7 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 70.
Thursday
A 50 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 83.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Chance of precipitation is 50%.
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 66.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 79.
Saturday Night
Showers likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Sunday
Showers likely. Mostly cloudy, with a high near 80. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Nissequogue NY
 40.9°N 73.18°W (Elev. 7 ft)
Last Update:
2:24 pm EDT Aug 17, 2026
Forecast Valid:
2pm EDT Aug 17, 2026-6pm EDT Aug 23, 2026
 
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