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

47°F

8°C

Humidity 83%
Wind Speed N 7 mph
Barometer 29.82 in (1009.9 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 1 May 1:56 am EDT
Extended Forecast for

Islip Terrace NY

  • Overnight

    Overnight: Partly cloudy, with a low around 45. Northwest wind around 6 mph.

    Low: 45 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 63. Northwest wind 6 to 8 mph becoming southwest in the afternoon.

    High: 63 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers after 2am. Increasing clouds, with a low around 46. Southwest wind 3 to 6 mph.

    Low: 46 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers, mainly after 2pm. Mostly cloudy, with a high near 57. Southwest wind 3 to 7 mph.

    High: 57 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 50 percent chance of showers. Cloudy, with a low around 44. Calm wind becoming north around 5 mph after midnight.

    Low: 44 °F

    Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 59.

    High: 59 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 51.

    Low: 51 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 45. Northwest wind around 6 mph.
Friday
Sunny, with a high near 63. Northwest wind 6 to 8 mph becoming southwest in the afternoon.
Friday Night
A 20 percent chance of showers after 2am. Increasing clouds, with a low around 46. Southwest wind 3 to 6 mph.
Saturday
A 30 percent chance of showers, mainly after 2pm. Mostly cloudy, with a high near 57. Southwest wind 3 to 7 mph.
Saturday Night
A 50 percent chance of showers. Cloudy, with a low around 44. Calm wind becoming north around 5 mph after midnight.
Sunday
Partly sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 44.
Monday
Sunny, with a high near 62.
Monday Night
Partly cloudy, with a low around 51.
Tuesday
Mostly sunny, with a high near 66.
Tuesday Night
Partly cloudy, with a low around 53.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 64. Breezy.
Wednesday Night
Showers likely. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.
Thursday
Showers likely. Mostly cloudy, with a high near 63. Chance of precipitation is 60%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
7:56 pm EDT Apr 30, 2026
Forecast Valid:
2am EDT May 1, 2026-6pm EDT May 7, 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