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

N/A

Humidity NA
Wind Speed SW 8 mph
Barometer 29.67 in
Dewpoint N/A
Visibility 10.00 mi
Last update 14 Jan 4:56 am EST
Extended Forecast for

Islip NY

  • Overnight

    Overnight: Isolated showers. Cloudy, with a low around 41. Southwest wind around 10 mph. Chance of precipitation is 20%.

    Low: 41 °F

    Isolated
    Showers

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 47. Southwest wind 6 to 9 mph.

    High: 47 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers, mainly after 10pm. Cloudy, with a steady temperature around 42. South wind around 6 mph becoming west after midnight.

    Low: 42 °F

    Chance
    Showers

  • Thursday

    Thursday: A slight chance of rain and snow showers before 10am, then a slight chance of snow showers between 10am and 1pm. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 31 by 5pm. Wind chill values between 20 and 30. West wind 8 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.

    High: 43 °F⇓

    Slight Chance
    Rain/Snow
    then Slight
    Chance Snow
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 20. West wind around 14 mph, with gusts as high as 31 mph.

    Low: 20 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 37.

    High: 37 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 42.

    High: 42 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Isolated showers. Cloudy, with a low around 41. Southwest wind around 10 mph. Chance of precipitation is 20%.
Wednesday
Mostly cloudy, with a high near 47. Southwest wind 6 to 9 mph.
Wednesday Night
A 50 percent chance of showers, mainly after 10pm. Cloudy, with a steady temperature around 42. South wind around 6 mph becoming west after midnight.
Thursday
A slight chance of rain and snow showers before 10am, then a slight chance of snow showers between 10am and 1pm. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 31 by 5pm. Wind chill values between 20 and 30. West wind 8 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 20. West wind around 14 mph, with gusts as high as 31 mph.
Friday
Sunny, with a high near 37.
Friday Night
Mostly cloudy, with a low around 29.
Saturday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 42.
Saturday Night
Mostly cloudy, with a low around 27.
Sunday
Partly sunny, with a high near 34.
Sunday Night
Partly cloudy, with a low around 21.
M.L.King Day
Mostly sunny, with a high near 33.
Monday Night
Mostly cloudy, with a low around 20.
Tuesday
Mostly sunny, with a high near 30.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
1:35 am EST Jan 14, 2026
Forecast Valid:
5am EST Jan 14, 2026-6pm EST Jan 20, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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