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

81°F

27°C

Humidity 24%
Wind Speed S 8 mph
Barometer 30.18 in (1021.8 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 3 Jun 2:56 pm EDT
Extended Forecast for

Nissequogue NY

  • Tonight

    Tonight: Mostly clear, with a low around 61. South wind 5 to 9 mph becoming calm after midnight.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 86. West wind 3 to 6 mph.

    High: 86 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 63. South wind 5 to 8 mph becoming calm after midnight.

    Low: 63 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 91. Calm wind becoming southwest 5 to 7 mph in the afternoon.

    High: 91 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 70. Southwest wind 5 to 7 mph.

    Low: 70 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 93.

    High: 93 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 70%.

    High: 83 °F

    Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.

    Low: 58 °F

    Showers
    Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 61. South wind 5 to 9 mph becoming calm after midnight.
Thursday
Sunny, with a high near 86. West wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 63. South wind 5 to 8 mph becoming calm after midnight.
Friday
Mostly sunny, with a high near 91. Calm wind becoming southwest 5 to 7 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 70. Southwest wind 5 to 7 mph.
Saturday
Mostly sunny, with a high near 93.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 70.
Sunday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 70%.
Sunday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.
Monday
Mostly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 57.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Partly cloudy, with a low around 58.
Wednesday
Mostly sunny, with a high near 79.
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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:
3:03 pm EDT Jun 3, 2026
Forecast Valid:
3pm EDT Jun 3, 2026-6pm EDT Jun 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