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

73°F

23°C

Humidity 46%
Wind Speed W 13 mph
Barometer 29.70 in (1005.6 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 19 Jun 8:56 am EDT
Extended Forecast for

Nissequogue NY

  • Juneteenth

    Juneteenth: Partly sunny, with a high near 83. West wind 11 to 13 mph.

    High: 83 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 64. West wind 9 to 14 mph.

    Low: 64 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 84. West wind 14 to 16 mph.

    High: 84 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64. Northwest wind 6 to 10 mph.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 84. West wind 5 to 7 mph.

    High: 84 °F

    Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of showers after 2am. Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy
    then Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms before 8am, then showers likely and possibly a thunderstorm between 8am and 2pm, then rain and possibly a thunderstorm after 2pm. High near 80. Chance of precipitation is 90%.

    High: 80 °F

    Showers

  • Monday Night

    Monday Night: Rain before 8pm, then showers likely, mainly between 8pm and 2am. Low around 66. Chance of precipitation is 80%.

    Low: 66 °F

    Rain

  • Tuesday

    Tuesday: A 30 percent chance of showers before 8am. Mostly sunny, with a high near 82.

    High: 82 °F

    Chance
    Showers then
    Mostly Sunny

Detailed Forecast

Juneteenth
Partly sunny, with a high near 83. West wind 11 to 13 mph.
Tonight
Mostly clear, with a low around 64. West wind 9 to 14 mph.
Saturday
Sunny, with a high near 84. West wind 14 to 16 mph.
Saturday Night
Mostly clear, with a low around 64. Northwest wind 6 to 10 mph.
Sunday
Sunny, with a high near 84. West wind 5 to 7 mph.
Sunday Night
A 30 percent chance of showers after 2am. Partly cloudy, with a low around 66.
Monday
A chance of showers and thunderstorms before 8am, then showers likely and possibly a thunderstorm between 8am and 2pm, then rain and possibly a thunderstorm after 2pm. High near 80. Chance of precipitation is 90%.
Monday Night
Rain before 8pm, then showers likely, mainly between 8pm and 2am. Low around 66. Chance of precipitation is 80%.
Tuesday
A 30 percent chance of showers before 8am. Mostly sunny, with a high near 82.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 83.
Wednesday Night
Partly cloudy, with a low around 67.
Thursday
Mostly 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:
2:29 am EDT Jun 19, 2026
Forecast Valid:
9am EDT Jun 19, 2026-6pm EDT Jun 25, 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