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.

Fog/Mist

47°F

8°C

Humidity 97%
Wind Speed SE 8 mph
Barometer 29.87 in (1011.4 mb)
Dewpoint 46°F (8°C)
Visibility 2.50 mi
Wind Chill43°F (6°C)
Last update 19 Apr 2:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

Freeze Watch April 21, 12:00am until April 21, 09:00am
Click here for hazard details and duration
Freeze Watch

  • Overnight

    Overnight: A 30 percent chance of showers, mainly after 5am. Patchy fog. Otherwise, cloudy, with a steady temperature around 48. Light southeast wind.

    Low: 48 °F

    Chance
    Showers and
    Patchy Fog

  • Sunday

    Sunday: Showers, mainly between 11am and 5pm. Patchy fog before 11am. High near 54. South wind 5 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 54 °F

    Showers and
    Patchy Fog

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 8pm. Mostly cloudy during the early evening, then gradual clearing, with a low around 39. West wind around 6 mph becoming calm after midnight.

    Low: 39 °F

    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: A 30 percent chance of showers. Sunny through mid morning, then becoming mostly cloudy, with a high near 51. West wind 5 to 9 mph.

    High: 51 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 32. North wind 6 to 8 mph.

    Low: 32 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 40.

    Low: 40 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 58.

    High: 58 °F

    Partly Sunny

  • Wednesday Night

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

    Low: 44 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers, mainly after 5am. Patchy fog. Otherwise, cloudy, with a steady temperature around 48. Light southeast wind.
Sunday
Showers, mainly between 11am and 5pm. Patchy fog before 11am. High near 54. South wind 5 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 30 percent chance of showers before 8pm. Mostly cloudy during the early evening, then gradual clearing, with a low around 39. West wind around 6 mph becoming calm after midnight.
Monday
A 30 percent chance of showers. Sunny through mid morning, then becoming mostly cloudy, with a high near 51. West wind 5 to 9 mph.
Monday Night
Partly cloudy, with a low around 32. North wind 6 to 8 mph.
Tuesday
Sunny, with a high near 51.
Tuesday Night
Increasing clouds, with a low around 40.
Wednesday
Partly sunny, with a high near 58.
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 59.
Friday Night
Partly cloudy, with a low around 45.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 60.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

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 19, 2026
Forecast Valid:
3am EDT Apr 19, 2026-6pm EDT Apr 25, 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