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.

Light Snow Fog/Mist Blowing Snow and Windy

30°F

-1°C

Humidity 85%
Wind Speed NW 29 mph
Barometer 29.41 in (995.8 mb)
Dewpoint 26°F (-3°C)
Visibility 0.75 mi
Wind Chill15°F (-9°C)
Last update 23 Feb 11:56 am EST
Extended Forecast for

Ronkonkoma NY

Coastal Flood Advisory until February 23, 06:00pm
Blizzard Warning February 23, 12:10pm until February 23, 06:00pm
Click here for hazard details and duration
Coastal Flood Advisory
Blizzard Warning
  •  
    Coastal Flood Advisory until February 23, 06:00pm
    Blizzard Warning February 23, 12:10pm until February 23, 06:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • This Afternoon

    High: 33 °F

    Heavy Snow
    and Areas
    Blowing Snow

  • Tonight

    Tonight: Cloudy, then gradually becoming partly cloudy, with a low around 21. Wind chill values between 10 and 15. Blustery, with a northwest wind 16 to 21 mph, with gusts as high as 34 mph.

    Low: 21 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 30. Wind chill values between 10 and 20. Northwest wind 11 to 14 mph.

    High: 30 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of snow, mainly after 4am. Mostly cloudy, with a low around 19. West wind 5 to 8 mph becoming light and variable.

    Low: 19 °F

    Partly Cloudy
    then Chance
    Snow

  • Wednesday

    Wednesday: Rain and snow likely, becoming all rain after 10am, then gradually ending. Cloudy, then gradually becoming mostly sunny, with a high near 40. Southwest wind 13 to 16 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 40 °F

    Rain/Snow
    Likely then
    Rain Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of rain and snow after 1pm. Partly sunny, with a high near 40. Chance of precipitation is 50%.

    High: 40 °F

    Partly Sunny
    then Chance
    Rain/Snow

  • Thursday Night

    Thursday Night: Rain likely. Mostly cloudy, with a low around 30. Chance of precipitation is 70%.

    Low: 30 °F

    Rain Likely

Detailed Forecast

This Afternoon
Snow, mainly before 4pm. The snow could be heavy at times. Areas of blowing snow. High near 33. Wind chill values between 15 and 20. Windy, with a northwest wind 25 to 32 mph, with gusts as high as 50 mph. Chance of precipitation is 90%. Total daytime snow accumulation of 3 to 7 inches possible.
Tonight
Cloudy, then gradually becoming partly cloudy, with a low around 21. Wind chill values between 10 and 15. Blustery, with a northwest wind 16 to 21 mph, with gusts as high as 34 mph.
Tuesday
Mostly sunny, with a high near 30. Wind chill values between 10 and 20. Northwest wind 11 to 14 mph.
Tuesday Night
A 50 percent chance of snow, mainly after 4am. Mostly cloudy, with a low around 19. West wind 5 to 8 mph becoming light and variable.
Wednesday
Rain and snow likely, becoming all rain after 10am, then gradually ending. Cloudy, then gradually becoming mostly sunny, with a high near 40. Southwest wind 13 to 16 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Wednesday Night
Partly cloudy, with a low around 28.
Thursday
A chance of rain and snow after 1pm. Partly sunny, with a high near 40. Chance of precipitation is 50%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 30. Chance of precipitation is 70%.
Friday
Partly sunny, with a high near 41.
Friday Night
Mostly clear, with a low around 29.
Saturday
Sunny, with a high near 44.
Saturday Night
Partly cloudy, with a low around 31.
Sunday
Partly sunny, with a high near 42.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Ronkonkoma NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
1:42 am EST Feb 23, 2026
Forecast Valid:
12pm EST Feb 23, 2026-6pm EST Mar 1, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation