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.

Fair

34°F

1°C

Humidity 89%
Wind Speed Calm
Barometer 30.09 in (1018.9 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Last update 20 Apr 1:56 am EDT
Extended Forecast for

Patchogue NY

Frost Advisory April 20, 02:16am 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
  •  
    Frost Advisory April 20, 02:16am until April 20, 08:00am

    NOW until 8:00am Mon

    Frost Advisory

  • Overnight

    Low: 36 °F

    Areas Frost

  • Monday

    Monday: A 40 percent chance of showers, mainly between 8am and 4pm. Areas of frost before 8am. Otherwise, partly sunny, with a high near 51. Light and variable wind becoming northwest 5 to 9 mph in the morning.

    High: 51 °F

    Chance
    Showers

  • Monday Night

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

    Low: 31 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 51. North wind 5 to 7 mph becoming southwest in the afternoon.

    High: 51 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 40. South wind 6 to 8 mph.

    Low: 40 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Cloudy, then gradually becoming mostly sunny, with a high near 55.

    High: 55 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

Detailed Forecast

Overnight
Areas of frost after 5am. Otherwise, clear, with a low around 36. Light west wind.
Monday
A 40 percent chance of showers, mainly between 8am and 4pm. Areas of frost before 8am. Otherwise, partly sunny, with a high near 51. 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. North wind 7 to 9 mph.
Tuesday
Sunny, with a high near 51. North wind 5 to 7 mph becoming southwest in the afternoon.
Tuesday Night
A 20 percent chance of showers after 2am. Mostly cloudy, with a low around 40. South wind 6 to 8 mph.
Wednesday
Cloudy, then gradually becoming mostly sunny, with a high near 55.
Wednesday Night
Partly cloudy, with a low around 43.
Thursday
Mostly sunny, with a high near 62.
Thursday Night
Partly cloudy, with a low around 45.
Friday
Mostly sunny, with a high near 60.
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 57.
Saturday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 44.
Sunday
A 40 percent chance of showers. Mostly cloudy, with a high near 56.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Patchogue NY
 40.77°N 73°W (Elev. 43 ft)
Last Update:
6:50 pm EDT Apr 19, 2026
Forecast Valid:
2am EDT Apr 20, 2026-6pm EDT Apr 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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