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

28°F

-2°C

Humidity 100%
Wind Speed SW 3 mph
Barometer 30.10 in (1019.4 mb)
Dewpoint 28°F (-2°C)
Visibility 9.00 mi
Last update 17 Jan 8:56 pm EST
Extended Forecast for

Bayport NY

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

  • Tonight

    Tonight: A 40 percent chance of rain, mainly after 4am. Mostly cloudy, with a steady temperature around 34. West wind around 6 mph becoming calm in the evening.

    Low: 34 °F

    Mostly Cloudy
    then Chance
    Rain

  • Sunday

    Sunday: Periods of rain and snow, becoming all snow after 11am. High near 35. Calm wind becoming northeast 5 to 8 mph in the morning. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.

    High: 35 °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 24. Wind chill values between 15 and 20. Northwest wind around 7 mph.

    Low: 24 °F

    Chance Snow

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 34. Wind chill values between 15 and 20. West wind 8 to 16 mph, with gusts as high as 28 mph.

    High: 34 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 17. West wind 13 to 16 mph, with gusts as high as 28 mph.

    Low: 17 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 25.

    High: 25 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 16.

    Low: 16 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 40 percent chance of rain, mainly after 4am. Mostly cloudy, with a steady temperature around 34. West wind around 6 mph becoming calm in the evening.
Sunday
Periods of rain and snow, becoming all snow after 11am. High near 35. Calm wind becoming northeast 5 to 8 mph in the morning. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.
Sunday Night
A 40 percent chance of snow before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 24. Wind chill values between 15 and 20. Northwest wind around 7 mph.
M.L.King Day
Mostly sunny, with a high near 34. Wind chill values between 15 and 20. West wind 8 to 16 mph, with gusts as high as 28 mph.
Monday Night
Partly cloudy, with a low around 17. West wind 13 to 16 mph, with gusts as high as 28 mph.
Tuesday
Mostly sunny, with a high near 25.
Tuesday Night
Mostly clear, with a low around 16.
Wednesday
Mostly sunny, with a high near 39.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
Partly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 21.
Friday
Mostly sunny, with a high near 34.
Friday Night
Partly cloudy, with a low around 24.
Saturday
Partly sunny, with a high near 33.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Bayport NY
 40.73°N 73.04°W (Elev. 0 ft)
Last Update:
5:41 pm EST Jan 17, 2026
Forecast Valid:
9pm EST Jan 17, 2026-6pm EST Jan 24, 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