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.

A Few Clouds

36°F

2°C

Humidity 89%
Wind Speed NW 6 mph
Barometer 29.90 in (1012.6 mb)
Dewpoint 33°F (1°C)
Visibility 7.00 mi
Wind Chill31°F (-1°C)
Last update 21 Feb 7:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

Coastal Flood Watch February 22, 10:00pm until February 23, 04:00am
Blizzard Warning February 22, 06:00am until February 23, 06:00pm
Click here for hazard details and duration
Coastal Flood Watch
Blizzard Warning

  • Today

    Today: Mostly sunny, with a high near 44. Northwest wind 6 to 8 mph.

    High: 44 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of snow before 1am, then a chance of snow after 4am. Mostly cloudy, with a low around 32. Calm wind becoming east 5 to 9 mph after midnight. Chance of precipitation is 40%.

    Low: 32 °F

    Chance Snow

  • Sunday

    Sunday: Snow likely, mainly after 10am. Cloudy, with a high near 35. Wind chill values between 20 and 25. Breezy, with an east wind 10 to 15 mph increasing to 17 to 22 mph in the afternoon. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.

    High: 35 °F

    Snow Likely
    and Breezy

  • Sunday Night

    Sunday Night: Snow. The snow could be heavy at times. Areas of blowing snow. Low around 30. Wind chill values between 15 and 20. Windy, with a northeast wind 20 to 29 mph, with gusts as high as 47 mph. Chance of precipitation is 100%. New snow accumulation of 8 to 12 inches possible.

    Low: 30 °F

    Heavy Snow
    and Areas
    Blowing Snow

  • Monday

    Monday: Snow. The snow could be heavy at times. Areas of blowing snow. High near 33. Windy, with a north wind 22 to 31 mph, with gusts as high as 55 mph. Chance of precipitation is 90%. New snow accumulation of 5 to 9 inches possible.

    High: 33 °F

    Heavy Snow
    and Areas
    Blowing Snow

  • Monday Night

    Monday Night: Cloudy, then gradually becoming partly cloudy, with a low around 23.

    Low: 23 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 19.

    Low: 19 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of rain and snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.

    High: 37 °F

    Chance
    Rain/Snow

Detailed Forecast

Today
Mostly sunny, with a high near 44. Northwest wind 6 to 8 mph.
Tonight
A slight chance of snow before 1am, then a chance of snow after 4am. Mostly cloudy, with a low around 32. Calm wind becoming east 5 to 9 mph after midnight. Chance of precipitation is 40%.
Sunday
Snow likely, mainly after 10am. Cloudy, with a high near 35. Wind chill values between 20 and 25. Breezy, with an east wind 10 to 15 mph increasing to 17 to 22 mph in the afternoon. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.
Sunday Night
Snow. The snow could be heavy at times. Areas of blowing snow. Low around 30. Wind chill values between 15 and 20. Windy, with a northeast wind 20 to 29 mph, with gusts as high as 47 mph. Chance of precipitation is 100%. New snow accumulation of 8 to 12 inches possible.
Monday
Snow. The snow could be heavy at times. Areas of blowing snow. High near 33. Windy, with a north wind 22 to 31 mph, with gusts as high as 55 mph. Chance of precipitation is 90%. New snow accumulation of 5 to 9 inches possible.
Monday Night
Cloudy, then gradually becoming partly cloudy, with a low around 23.
Tuesday
Mostly sunny, with a high near 32.
Tuesday Night
Mostly cloudy, with a low around 19.
Wednesday
A chance of rain and snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 31.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 43.
Thursday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 31.
Friday
A 30 percent chance of rain. Mostly sunny, with a high near 42.
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
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
3:41 am EST Feb 21, 2026
Forecast Valid:
8am EST Feb 21, 2026-6pm EST Feb 27, 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