National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

66°F

19°C

Humidity 54%
Wind Speed W 13 G 23 mph
Barometer 29.73 in (1006.7 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 20 Jun 5:56 am EDT
Extended Forecast for

Islandia NY

  • Today

    Today: Sunny, with a high near 81. Breezy, with a northwest wind 16 to 20 mph.

    High: 81 °F

    Sunny and
    Breezy then
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 63. Northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 81. Light and variable wind becoming west 5 to 8 mph in the morning.

    High: 81 °F

    Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers after 2am. Partly cloudy, with a low around 64. Light and variable wind.

    Low: 64 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Monday

    Monday: Showers likely, then showers and possibly a thunderstorm after 2pm. High near 77. Light southeast wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    High: 77 °F

    Showers

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 64. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 64 °F

    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers before 8am. Mostly sunny, with a high near 79.

    High: 79 °F

    Chance
    Showers then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 81. Breezy, with a northwest wind 16 to 20 mph.
Tonight
Mostly clear, with a low around 63. Northwest wind 5 to 7 mph becoming calm in the evening.
Sunday
Sunny, with a high near 81. Light and variable wind becoming west 5 to 8 mph in the morning.
Sunday Night
A 20 percent chance of showers after 2am. Partly cloudy, with a low around 64. Light and variable wind.
Monday
Showers likely, then showers and possibly a thunderstorm after 2pm. High near 77. Light southeast wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Monday Night
Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 64. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
A 30 percent chance of showers before 8am. Mostly sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Sunny, with a high near 82.
Wednesday Night
Mostly clear, with a low around 65.
Thursday
Sunny, with a high near 81.
Thursday Night
Partly cloudy, with a low around 66.
Friday
A 40 percent chance of showers. Partly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islandia NY
 40.81°N 73.17°W (Elev. 161 ft)
Last Update:
2:19 am EDT Jun 20, 2026
Forecast Valid:
6am EDT Jun 20, 2026-6pm EDT Jun 26, 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