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

49°F

9°C

Humidity 83%
Wind Speed SW 8 mph
Barometer 30.10 in (1019.2 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 30 Mar 11:56 pm EDT
Extended Forecast for

Islip Terrace NY

  • Overnight

    Overnight: A 50 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 48. Southwest wind around 7 mph, with gusts as high as 20 mph.

    Low: 48 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 50 percent chance of showers before 2pm. Partly sunny, with a high near 62. Southwest wind 9 to 15 mph, with gusts as high as 26 mph.

    High: 62 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 2am. Partly cloudy, with a low around 50. Southwest wind 11 to 14 mph, with gusts as high as 28 mph.

    Low: 50 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 62. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 62 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Cloudy, with a low around 43. Southwest wind around 6 mph becoming northeast in the evening. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 43 °F

    Showers
    Likely

  • Thursday

    Thursday: A 30 percent chance of showers before 2pm. Cloudy, with a high near 51.

    High: 51 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers between 8pm and 2am. Cloudy, with a low around 42. Chance of precipitation is 30%.

    Low: 42 °F

    Chance
    Showers

  • Friday

    Friday: Mostly cloudy, with a high near 59.

    High: 59 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Chance
    Showers

Detailed Forecast

Overnight
A 50 percent chance of showers, mainly after 2am. Mostly cloudy, with a low around 48. Southwest wind around 7 mph, with gusts as high as 20 mph.
Tuesday
A 50 percent chance of showers before 2pm. Partly sunny, with a high near 62. Southwest wind 9 to 15 mph, with gusts as high as 26 mph.
Tuesday Night
A 20 percent chance of showers after 2am. Partly cloudy, with a low around 50. Southwest wind 11 to 14 mph, with gusts as high as 28 mph.
Wednesday
A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 62. Southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Cloudy, with a low around 43. Southwest wind around 6 mph becoming northeast in the evening. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
A 30 percent chance of showers before 2pm. Cloudy, with a high near 51.
Thursday Night
A chance of showers between 8pm and 2am. Cloudy, with a low around 42. Chance of precipitation is 30%.
Friday
Mostly cloudy, with a high near 59.
Friday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 49.
Saturday
Mostly cloudy, with a high near 62.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 47.
Sunday
A 40 percent chance of showers. Mostly cloudy, with a high near 60.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 42.
Monday
A 30 percent chance of showers. Partly sunny, with a high near 54.
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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:
5:53 pm EDT Mar 30, 2026
Forecast Valid:
12am EDT Mar 31, 2026-6pm EDT Apr 6, 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