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

81°F

27°C

Humidity 69%
Wind Speed Calm
Barometer 30.00 in (1015.7 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 28 Aug 11:56 am EDT
Extended Forecast for

Nissequogue NY

  • This Afternoon

    This Afternoon: A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 82. West wind around 5 mph. Chance of precipitation is 40%.

    High: 82 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 63. Light and variable wind becoming north 5 to 9 mph after midnight.

    Low: 63 °F

    Chance
    T-storms then
    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 79. North wind 5 to 8 mph becoming calm in the afternoon.

    High: 79 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. Light south wind.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 81. Light west wind becoming southwest 5 to 10 mph in the morning.

    High: 81 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 68.

    Low: 68 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 83.

    High: 83 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 67.

    Low: 67 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 50 percent chance of showers after 8am. Mostly cloudy, with a high near 80.

    High: 80 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 82. West wind around 5 mph. Chance of precipitation is 40%.
Tonight
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 63. Light and variable wind becoming north 5 to 9 mph after midnight.
Saturday
Mostly sunny, with a high near 79. North wind 5 to 8 mph becoming calm in the afternoon.
Saturday Night
Mostly clear, with a low around 63. Light south wind.
Sunday
Sunny, with a high near 81. Light west wind becoming southwest 5 to 10 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 68.
Monday
Partly sunny, with a high near 83.
Monday Night
Mostly cloudy, with a low around 67.
Tuesday
A 50 percent chance of showers after 8am. Mostly cloudy, with a high near 80.
Tuesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 68.
Wednesday
A 50 percent chance of showers. Partly sunny, with a high near 80.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 67.
Thursday
Partly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Nissequogue NY
 40.9°N 73.18°W (Elev. 7 ft)
Last Update:
4:20 am EDT Aug 28, 2026
Forecast Valid:
12pm EDT Aug 28, 2026-6pm EDT Sep 3, 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