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 81%
Wind Speed NW 12 mph
Barometer 29.76 in (1007.7 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 27 Mar 6:56 am EDT
Extended Forecast for

Islip Terrace NY

  • Today

    Today: A 30 percent chance of showers before 11am. Mostly cloudy, with a high near 53. North wind 9 to 14 mph.

    High: 53 °F

    Chance
    Showers then
    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 31. North wind 5 to 8 mph.

    Low: 31 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 41. Wind chill values between 25 and 35. Northwest wind 9 to 13 mph.

    High: 41 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29. Northwest wind around 5 mph becoming calm in the evening.

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 47. Light south wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 26 mph.

    High: 47 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 54.

    High: 54 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of rain. Partly sunny, with a high near 55.

    High: 55 °F

    Chance Rain

Detailed Forecast

Today
A 30 percent chance of showers before 11am. Mostly cloudy, with a high near 53. North wind 9 to 14 mph.
Tonight
Mostly cloudy, with a low around 31. North wind 5 to 8 mph.
Saturday
Mostly sunny, with a high near 41. Wind chill values between 25 and 35. Northwest wind 9 to 13 mph.
Saturday Night
Partly cloudy, with a low around 29. Northwest wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 47. Light south wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 26 mph.
Sunday Night
Mostly cloudy, with a low around 39.
Monday
Partly sunny, with a high near 54.
Monday Night
Mostly cloudy, with a low around 42.
Tuesday
A 30 percent chance of rain. Partly sunny, with a high near 55.
Tuesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 43.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 59.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 46.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 59.
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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:
4:46 am EDT Mar 27, 2026
Forecast Valid:
7am EDT Mar 27, 2026-6pm EDT Apr 2, 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