National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

43°F

6°C

Humidity 80%
Wind Speed NW 10 mph
Barometer 29.97 in (1014.8 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 19 Apr 6:56 pm EDT
Extended Forecast for

Centereach NY

Frost Advisory April 20, 12:00am until April 20, 08:00am
Freeze Warning April 21, 12:00am until April 21, 09:00am
Click here for hazard details and duration
Frost Advisory
Freeze Warning

  • Tonight

    Tonight: A slight chance of showers between 8pm and 10pm. Areas of frost after 5am. Otherwise, mostly clear, with a low around 36. Northwest wind 6 to 11 mph becoming light west after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 20%.

    Low: 36 °F

    Slight Chance
    Showers then
    Areas Frost

  • Monday

    Monday: A 40 percent chance of showers. Areas of frost before 7am. Otherwise, partly sunny, with a high near 52. Light and variable wind becoming northwest 5 to 9 mph in the morning.

    High: 52 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 31. Wind chill values between 25 and 30. Northwest wind 7 to 9 mph.

    Low: 31 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 53. Wind chill values between 25 and 35 early. North wind 5 to 7 mph becoming southwest in the afternoon.

    High: 53 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 2am. Increasing clouds, with a low around 41. South wind around 7 mph.

    Low: 41 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Cloudy, then gradually becoming mostly sunny, with a high near 57.

    High: 57 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

Detailed Forecast

Tonight
A slight chance of showers between 8pm and 10pm. Areas of frost after 5am. Otherwise, mostly clear, with a low around 36. Northwest wind 6 to 11 mph becoming light west after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 20%.
Monday
A 40 percent chance of showers. Areas of frost before 7am. Otherwise, partly sunny, with a high near 52. Light and variable wind becoming northwest 5 to 9 mph in the morning.
Monday Night
Partly cloudy, with a low around 31. Wind chill values between 25 and 30. Northwest wind 7 to 9 mph.
Tuesday
Sunny, with a high near 53. Wind chill values between 25 and 35 early. North wind 5 to 7 mph becoming southwest in the afternoon.
Tuesday Night
A 20 percent chance of showers after 2am. Increasing clouds, with a low around 41. South wind around 7 mph.
Wednesday
Cloudy, then gradually becoming mostly sunny, with a high near 57.
Wednesday Night
Partly cloudy, with a low around 44.
Thursday
Mostly sunny, with a high near 64.
Thursday Night
Partly cloudy, with a low around 46.
Friday
Mostly sunny, with a high near 62.
Friday Night
A 30 percent chance of showers. Partly cloudy, with a low around 44.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 59.
Saturday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 44.
Sunday
A 30 percent chance of showers. Mostly cloudy, with a high near 59.
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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:
6:50 pm EDT Apr 19, 2026
Forecast Valid:
7pm EDT Apr 19, 2026-6pm EDT Apr 26, 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