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

32°F

0°C

Humidity 66%
Wind Speed Calm
Barometer 30.49 in (1032.6 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Last update 29 Nov 11:56 pm EST
Extended Forecast for

Islip Terrace NY

  • Overnight

    Overnight: Cloudy, with a temperature rising to around 37 by 5am. Calm wind becoming southeast around 5 mph.

    Low: 31 °F⇑

    Cloudy

  • Sunday

    Sunday: Rain, mainly after 1pm. High near 52. South wind 8 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 52 °F

    Chance Rain
    then Rain

  • Sunday Night

    Sunday Night: A 20 percent chance of rain before 10pm. Cloudy during the early evening, then gradual clearing, with a low around 33. West wind around 11 mph, with gusts as high as 23 mph.

    Low: 33 °F

    Slight Chance
    Rain then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 43. Wind chill values between 25 and 35. Northwest wind 8 to 13 mph.

    High: 43 °F

    Sunny

  • Monday Night

    Monday Night: A 50 percent chance of rain after 4am. Increasing clouds, with a low around 29. North wind around 5 mph becoming calm in the evening.

    Low: 29 °F

    Partly Cloudy
    then Chance
    Rain

  • Tuesday

    Tuesday: Rain, mainly after 7am. High near 45. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.

    High: 45 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain likely before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 30. Chance of precipitation is 60%.

    Low: 30 °F

    Rain Likely

  • Wednesday

    Wednesday: Sunny, with a high near 42.

    High: 42 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

Detailed Forecast

Overnight
Cloudy, with a temperature rising to around 37 by 5am. Calm wind becoming southeast around 5 mph.
Sunday
Rain, mainly after 1pm. High near 52. South wind 8 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 20 percent chance of rain before 10pm. Cloudy during the early evening, then gradual clearing, with a low around 33. West wind around 11 mph, with gusts as high as 23 mph.
Monday
Sunny, with a high near 43. Wind chill values between 25 and 35. Northwest wind 8 to 13 mph.
Monday Night
A 50 percent chance of rain after 4am. Increasing clouds, with a low around 29. North wind around 5 mph becoming calm in the evening.
Tuesday
Rain, mainly after 7am. High near 45. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Tuesday Night
Rain likely before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 30. Chance of precipitation is 60%.
Wednesday
Sunny, with a high near 42.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
Partly sunny, with a high near 43.
Thursday Night
Partly cloudy, with a low around 23.
Friday
Partly sunny, with a high near 39.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 27.
Saturday
A 30 percent chance of rain. Mostly cloudy, with a high near 41.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
5:44 pm EST Nov 29, 2025
Forecast Valid:
12am EST Nov 30, 2025-6pm EST Dec 6, 2025
 
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