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.

Fair

56°F

13°C

Humidity 81%
Wind Speed SW 13 mph
Barometer 29.91 in (1012.7 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 1 Apr 4:56 am EDT
Extended Forecast for

Islip Terrace NY

  • Overnight

    Overnight: A 50 percent chance of showers. Mostly cloudy, with a low around 53. Southwest wind around 13 mph.

    Low: 53 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely, then showers and possibly a thunderstorm after 5pm. High near 69. Southwest wind 9 to 11 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 69 °F

    Chance
    Showers then
    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 11pm, then showers likely. Patchy fog after 2am. Low around 40. Light northeast wind increasing to 6 to 11 mph in the evening. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F

    Showers and
    Patchy Fog

  • Thursday

    Thursday: A 40 percent chance of rain, mainly before 2pm. Patchy fog before 2pm. Otherwise, cloudy, with a high near 46. East wind around 15 mph.

    High: 46 °F

    Chance Rain
    and Patchy
    Fog

  • Thursday Night

    Thursday Night: A slight chance of rain or drizzle before 8pm, then a chance of drizzle or light rain, mainly after 2am. Areas of fog after 8pm. Otherwise, cloudy, with a low around 39. East wind 6 to 10 mph. Chance of precipitation is 30%.

    Low: 39 °F

    Chance Light
    Rain and
    Areas Fog

  • Friday

    Friday: A chance of drizzle or light rain before 8am. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 57. Chance of precipitation is 30%.

    High: 57 °F

    Chance Light
    Rain and
    Areas Fog
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 49.

    Low: 49 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 8pm. Mostly cloudy, with a low around 46.

    Low: 46 °F

    Chance
    Showers

Detailed Forecast

Overnight
A 50 percent chance of showers. Mostly cloudy, with a low around 53. Southwest wind around 13 mph.
Wednesday
Showers likely, then showers and possibly a thunderstorm after 5pm. High near 69. Southwest wind 9 to 11 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and possibly a thunderstorm before 11pm, then showers likely. Patchy fog after 2am. Low around 40. Light northeast wind increasing to 6 to 11 mph in the evening. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
A 40 percent chance of rain, mainly before 2pm. Patchy fog before 2pm. Otherwise, cloudy, with a high near 46. East wind around 15 mph.
Thursday Night
A slight chance of rain or drizzle before 8pm, then a chance of drizzle or light rain, mainly after 2am. Areas of fog after 8pm. Otherwise, cloudy, with a low around 39. East wind 6 to 10 mph. Chance of precipitation is 30%.
Friday
A chance of drizzle or light rain before 8am. Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 57. Chance of precipitation is 30%.
Friday Night
Mostly cloudy, with a low around 49.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
A 30 percent chance of showers after 8pm. Mostly cloudy, with a low around 46.
Sunday
Showers likely. Mostly cloudy, with a high near 58. Chance of precipitation is 70%.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 39.
Monday
Mostly sunny, with a high near 52.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Mostly sunny, with a high near 50.
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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:
2:38 am EDT Apr 1, 2026
Forecast Valid:
5am EDT Apr 1, 2026-6pm EDT Apr 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