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.

Fair

45°F

7°C

Humidity 86%
Wind Speed NW 5 mph
Barometer 30.09 in (1018.9 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 30 May 11:56 pm EDT
Extended Forecast for

Nissequogue NY

  • Overnight

    Overnight: Mostly clear, with a low around 50. Light north wind.

    Low: 50 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 74. West wind around 7 mph.

    High: 74 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 59. Southwest wind around 6 mph.

    Low: 59 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 74. Northwest wind 5 to 7 mph becoming northeast in the afternoon.

    High: 74 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 54. East wind 5 to 9 mph becoming light after midnight.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 50. Light north wind.
Sunday
Increasing clouds, with a high near 74. West wind around 7 mph.
Sunday Night
Partly cloudy, with a low around 59. Southwest wind around 6 mph.
Monday
Sunny, with a high near 74. Northwest wind 5 to 7 mph becoming northeast in the afternoon.
Monday Night
Mostly clear, with a low around 54. East wind 5 to 9 mph becoming light after midnight.
Tuesday
Sunny, with a high near 72.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 74.
Wednesday Night
Partly cloudy, with a low around 58.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
Partly cloudy, with a low around 64.
Friday
Mostly sunny, with a high near 85.
Friday Night
Partly cloudy, with a low around 69.
Saturday
A 30 percent chance of showers. Mostly sunny, with a high near 87.
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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:
8:38 pm EDT May 30, 2026
Forecast Valid:
12am EDT May 31, 2026-6pm EDT Jun 6, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation