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.

A Few Clouds

55°F

13°C

Humidity 93%
Wind Speed SW 5 mph
Barometer 30.22 in (1023.2 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Wind Chill54°F (12°C)
Last update 3 Nov 11:56 pm EST
Extended Forecast for

Nissequogue NY

  • Overnight

    Overnight: Patchy fog. Otherwise, partly cloudy, with a low around 54. Southwest wind around 5 mph.

    Low: 54 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 8am. Otherwise, sunny, with a high near 71. Light southwest wind increasing to 5 to 10 mph in the morning.

    High: 71 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 59. South wind 6 to 8 mph.

    Low: 59 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers. Increasing clouds, with a high near 70. South wind 7 to 10 mph.

    High: 70 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Showers. Low around 61. South wind 7 to 9 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 61 °F

    Showers

  • Friday

    Friday: Showers, with thunderstorms also possible after 1pm. High near 67. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    High: 67 °F

    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before 1am, then showers likely. Low around 55. Chance of precipitation is 80%.

    Low: 55 °F

    Showers

  • Saturday

    Saturday: A 40 percent chance of showers before 1pm. Partly sunny, with a high near 64.

    High: 64 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

Detailed Forecast

Overnight
Patchy fog. Otherwise, partly cloudy, with a low around 54. Southwest wind around 5 mph.
Wednesday
Patchy fog before 8am. Otherwise, sunny, with a high near 71. Light southwest wind increasing to 5 to 10 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 59. South wind 6 to 8 mph.
Thursday
A 20 percent chance of showers. Increasing clouds, with a high near 70. South wind 7 to 10 mph.
Thursday Night
Showers. Low around 61. South wind 7 to 9 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Showers, with thunderstorms also possible after 1pm. High near 67. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Friday Night
Showers and possibly a thunderstorm before 1am, then showers likely. Low around 55. Chance of precipitation is 80%.
Saturday
A 40 percent chance of showers before 1pm. Partly sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 46.
Sunday
Mostly sunny, with a high near 59.
Sunday Night
Partly cloudy, with a low around 43.
Monday
A 30 percent chance of rain. Mostly sunny, with a high near 58.
Monday Night
A 30 percent chance of rain. Partly cloudy, with a low around 43.
Tuesday
Sunny, with a high near 59.
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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:
3:51 pm EST Nov 3, 2026
Forecast Valid:
12am EST Nov 4, 2026-6pm EST Nov 10, 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