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.

Overcast

45°F

7°C

Humidity 83%
Wind Speed SW 7 mph
Barometer 29.39 in (995.3 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 15 Jan 12:56 am EST
Extended Forecast for

Centereach NY

  • Overnight

    Overnight: A 30 percent chance of showers, mainly before 3am. Cloudy, with a steady temperature around 43. South wind around 7 mph.

    Low: 43 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly cloudy, with a temperature rising to near 42 by 10am, then falling to around 35 during the remainder of the day. Southwest wind 6 to 14 mph, with gusts as high as 26 mph.

    High: 42 °F⇓

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 19. Wind chill values between 5 and 15. West wind 11 to 15 mph, with gusts as high as 29 mph.

    Low: 19 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 35. Wind chill values between 5 and 15. West wind 10 to 16 mph, with gusts as high as 30 mph.

    High: 35 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 28. Southwest wind around 6 mph.

    Low: 28 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Saturday

    Saturday: A chance of snow before 10am, then a chance of rain. Mostly cloudy, with a high near 42. Chance of precipitation is 50%.

    High: 42 °F

    Chance
    Rain/Snow
    then Chance
    Rain

  • Saturday Night

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

    Low: 29 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 40 percent chance of snow. Mostly cloudy, with a high near 37.

    High: 37 °F

    Chance Snow

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers, mainly before 3am. Cloudy, with a steady temperature around 43. South wind around 7 mph.
Thursday
Mostly cloudy, with a temperature rising to near 42 by 10am, then falling to around 35 during the remainder of the day. Southwest wind 6 to 14 mph, with gusts as high as 26 mph.
Thursday Night
Mostly cloudy, with a low around 19. Wind chill values between 5 and 15. West wind 11 to 15 mph, with gusts as high as 29 mph.
Friday
Sunny, with a high near 35. Wind chill values between 5 and 15. West wind 10 to 16 mph, with gusts as high as 30 mph.
Friday Night
A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 28. Southwest wind around 6 mph.
Saturday
A chance of snow before 10am, then a chance of rain. Mostly cloudy, with a high near 42. Chance of precipitation is 50%.
Saturday Night
Mostly cloudy, with a low around 29.
Sunday
A 40 percent chance of snow. Mostly cloudy, with a high near 37.
Sunday Night
Mostly cloudy, with a low around 21.
M.L.King Day
Mostly sunny, with a high near 31.
Monday Night
Partly cloudy, with a low around 16.
Tuesday
Mostly sunny, with a high near 25.
Tuesday Night
Mostly clear, with a low around 12.
Wednesday
Mostly sunny, with a high near 29.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Centereach NY
 40.87°N 73.07°W (Elev. 98 ft)
Last Update:
1:15 am EST Jan 15, 2026
Forecast Valid:
1am EST Jan 15, 2026-6pm EST Jan 21, 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