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

35°F

2°C

Humidity 67%
Wind Speed N 14 mph
Barometer 30.19 in (1022.2 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 24 Mar 12:56 am EDT
Extended Forecast for

Islip Terrace NY

  • Overnight

    Overnight: Mostly clear, with a low around 30. North wind around 8 mph, with gusts as high as 20 mph.

    Low: 30 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 45. Wind chill values between 20 and 30 early. North wind 3 to 7 mph.

    High: 45 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 34. South wind around 6 mph.

    Low: 34 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 49. Light west wind becoming south 5 to 10 mph in the morning.

    High: 49 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Cloudy, with a low around 40. South wind around 7 mph.

    Low: 40 °F

    Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 55.

    High: 55 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Rain likely, mainly after 2am. Mostly cloudy, with a low around 43. Chance of precipitation is 70%.

    Low: 43 °F

    Chance Rain
    then Rain
    Likely

  • Friday

    Friday: Rain likely, mainly before 8am. Mostly cloudy, with a high near 54. Chance of precipitation is 60%.

    High: 54 °F

    Rain Likely

  • Friday Night

    Friday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 30. North wind around 8 mph, with gusts as high as 20 mph.
Tuesday
Sunny, with a high near 45. Wind chill values between 20 and 30 early. North wind 3 to 7 mph.
Tuesday Night
Increasing clouds, with a low around 34. South wind around 6 mph.
Wednesday
Partly sunny, with a high near 49. Light west wind becoming south 5 to 10 mph in the morning.
Wednesday Night
Cloudy, with a low around 40. South wind around 7 mph.
Thursday
Mostly cloudy, with a high near 55.
Thursday Night
Rain likely, mainly after 2am. Mostly cloudy, with a low around 43. Chance of precipitation is 70%.
Friday
Rain likely, mainly before 8am. Mostly cloudy, with a high near 54. Chance of precipitation is 60%.
Friday Night
Partly cloudy, with a low around 26.
Saturday
Mostly sunny, with a high near 41.
Saturday Night
Mostly clear, with a low around 30.
Sunday
Sunny, with a high near 47.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Mostly sunny, with a high near 52.
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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:
5:10 pm EDT Mar 23, 2026
Forecast Valid:
1am EDT Mar 24, 2026-6pm EDT Mar 30, 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