National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Shirley, Brookhaven Airport (KHWV)

Lat: 40.82°NLon: 72.87°WElev: 82ft.

Fair

25°F

-4°C

Humidity 48%
Wind Speed NA
Barometer 30.26 in (1024.7 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Last update 9 Dec 9:56 am EST
Extended Forecast for

Mount Sinai NY

  • Today

    Today: Increasing clouds, with a high near 34. Wind chill values between 20 and 30. Light and variable wind becoming south around 6 mph in the afternoon.

    High: 34 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A 20 percent chance of snow before 10pm. Mostly cloudy, with a low around 31. Wind chill values between 25 and 30. Southwest wind 8 to 10 mph.

    Low: 31 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely, mainly after 1pm. Mostly cloudy, with a high near 47. Wind chill values between 25 and 35 early. South wind 11 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 47 °F

    Slight Chance
    Rain then
    Rain Likely

  • Wednesday Night

    Wednesday Night: A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Southwest wind 11 to 16 mph.

    Low: 31 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 39. West wind 14 to 17 mph, with gusts as high as 29 mph.

    High: 39 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy
    then Chance
    Snow

  • Saturday

    Saturday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 34. Wind chill values between 20 and 30. Light and variable wind becoming south around 6 mph in the afternoon.
Tonight
A 20 percent chance of snow before 10pm. Mostly cloudy, with a low around 31. Wind chill values between 25 and 30. Southwest wind 8 to 10 mph.
Wednesday
Rain likely, mainly after 1pm. Mostly cloudy, with a high near 47. Wind chill values between 25 and 35 early. South wind 11 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
A 30 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 31. Southwest wind 11 to 16 mph.
Thursday
Mostly sunny, with a high near 39. West wind 14 to 17 mph, with gusts as high as 29 mph.
Thursday Night
Partly cloudy, with a low around 27.
Friday
Mostly sunny, with a high near 37.
Friday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 28.
Saturday
Partly sunny, with a high near 40.
Saturday Night
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 26.
Sunday
A 30 percent chance of snow. Partly sunny, with a high near 34.
Sunday Night
Partly cloudy, with a low around 18.
Monday
Mostly sunny, with a high near 29.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Sinai NY
 40.95°N 73°W (Elev. 174 ft)
Last Update:
5:28 am EST Dec 9, 2025
Forecast Valid:
10am EST Dec 9, 2025-6pm EST Dec 15, 2025
 
Forecast Discussion
 
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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