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.

Overcast

41°F

5°C

Humidity 45%
Wind Speed W 12 mph
Barometer 30.02 in (1016.6 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 17 Jan 12:56 pm EST
Extended Forecast for

Hauppauge NY

Winter Weather Advisory January 18, 10:00am until January 18, 10:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • This Afternoon

    This Afternoon: Rain before 4pm, then a chance of rain and snow. High near 43. Southwest wind 8 to 10 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 43 °F

    Rain/Snow

  • Tonight

    Tonight: A chance of rain and snow before 1am, then a slight chance of rain between 1am and 4am, then a chance of snow after 4am. Mostly cloudy, with a low around 30. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 30 °F

    Chance
    Rain/Snow

  • Sunday

    Sunday: Periods of rain and snow, becoming all snow after 11am. High near 34. Calm wind becoming north around 6 mph in the afternoon. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

    High: 34 °F

    Rain/Snow
    then Snow

  • Sunday Night

    Sunday Night: A 40 percent chance of snow before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 22. Northwest wind 3 to 6 mph.

    Low: 22 °F

    Chance Snow

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 33. West wind 6 to 14 mph, with gusts as high as 24 mph.

    High: 33 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 16.

    Low: 16 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 24.

    High: 24 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 13.

    Low: 13 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Rain before 4pm, then a chance of rain and snow. High near 43. Southwest wind 8 to 10 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Tonight
A chance of rain and snow before 1am, then a slight chance of rain between 1am and 4am, then a chance of snow after 4am. Mostly cloudy, with a low around 30. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 40%.
Sunday
Periods of rain and snow, becoming all snow after 11am. High near 34. Calm wind becoming north around 6 mph in the afternoon. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.
Sunday Night
A 40 percent chance of snow before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 22. Northwest wind 3 to 6 mph.
M.L.King Day
Mostly sunny, with a high near 33. West wind 6 to 14 mph, with gusts as high as 24 mph.
Monday Night
Partly cloudy, with a low around 16.
Tuesday
Mostly sunny, with a high near 24.
Tuesday Night
Mostly clear, with a low around 13.
Wednesday
Mostly sunny, with a high near 37.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
Partly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 20.
Friday
Mostly sunny, with a high near 32.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hauppauge NY
 40.82°N 73.2°W (Elev. 197 ft)
Last Update:
1:04 pm EST Jan 17, 2026
Forecast Valid:
1pm EST Jan 17, 2026-6pm EST Jan 23, 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