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

57°F

14°C

Humidity 72%
Wind Speed SW 5 mph
Barometer 29.72 in (1006.4 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 30 Apr 4:56 pm EDT
Extended Forecast for

Islip NY

  • This Afternoon

    This Afternoon: A 20 percent chance of showers. Mostly sunny, with a steady temperature around 53. West wind around 5 mph.

    High: 53 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Partly cloudy, with a low around 45. Northwest wind 3 to 6 mph.

    Low: 45 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 62. Northwest wind 7 to 9 mph becoming southwest in the afternoon.

    High: 62 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers. Increasing clouds, with a low around 47. Southwest wind 5 to 7 mph.

    Low: 47 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers, mainly after 2pm. Mostly cloudy, with a high near 57. Light and variable wind becoming south 5 to 7 mph in the morning.

    High: 57 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 50 percent chance of showers. Cloudy, with a low around 45.

    Low: 45 °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 61.

    High: 61 °F

    Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers. Mostly sunny, with a steady temperature around 53. West wind around 5 mph.
Tonight
Partly cloudy, with a low around 45. Northwest wind 3 to 6 mph.
Friday
Sunny, with a high near 62. Northwest wind 7 to 9 mph becoming southwest in the afternoon.
Friday Night
A 20 percent chance of showers. Increasing clouds, with a low around 47. Southwest wind 5 to 7 mph.
Saturday
A 30 percent chance of showers, mainly after 2pm. Mostly cloudy, with a high near 57. Light and variable wind becoming south 5 to 7 mph in the morning.
Saturday Night
A 50 percent chance of showers. Cloudy, with a low around 45.
Sunday
Partly sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 44.
Monday
Sunny, with a high near 61.
Monday Night
Partly cloudy, with a low around 51.
Tuesday
Mostly sunny, with a high near 65.
Tuesday Night
Mostly cloudy, with a low around 53.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 63. Breezy.
Wednesday Night
Showers likely. Mostly cloudy, with a low around 52. Chance of precipitation is 60%.
Thursday
Showers likely. Mostly cloudy, with a high near 63.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
2:27 pm EDT Apr 30, 2026
Forecast Valid:
5pm EDT Apr 30, 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