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 48%
Wind Speed N 8 mph
Barometer 30.33 in (1027.1 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 21 Apr 4:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

Freeze Warning until April 21, 09:00am
Click here for hazard details and duration
Freeze Warning
  •  
    Freeze Warning until April 21, 09:00am

    NOW until 9:00am Tue

    Freeze Warning

  • Overnight

    Low: 31 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 50. North wind around 6 mph becoming south in the afternoon.

    High: 50 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Showers likely, mainly after 2am. Increasing clouds, with a low around 39. South wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 39 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely, mainly before 2pm. Cloudy, with a high near 53. South wind around 10 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 53 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

Detailed Forecast

Overnight
Clear, with a low around 31. North wind around 6 mph.
Tuesday
Sunny, with a high near 50. North wind around 6 mph becoming south in the afternoon.
Tuesday Night
Showers likely, mainly after 2am. Increasing clouds, with a low around 39. South wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
Showers likely, mainly before 2pm. Cloudy, with a high near 53. South wind around 10 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
Mostly cloudy, with a low around 44. Calm wind.
Thursday
Mostly sunny, with a high near 66.
Thursday Night
Mostly cloudy, with a low around 45.
Friday
Mostly sunny, with a high near 59.
Friday Night
A 30 percent chance of showers after 2am. Partly cloudy, with a low around 43.
Saturday
A 50 percent chance of showers. Mostly cloudy, with a high near 54.
Saturday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 42.
Sunday
A 30 percent chance of showers. Partly sunny, with a high near 56.
Sunday Night
Mostly cloudy, with a low around 42.
Monday
Mostly sunny, with a high near 58.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
2:19 am EDT Apr 21, 2026
Forecast Valid:
5am EDT Apr 21, 2026-6pm EDT Apr 27, 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