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

Hazardous Weather Conditions

Current conditions at

Shirley, Brookhaven Airport (KHWV)

Lat: 40.82°NLon: 72.87°WElev: 82ft.

Overcast

76°F

24°C

Humidity 82%
Wind Speed S 12 mph
Barometer 29.75 in (1007.1 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 28 Jul 8:56 am EDT
Extended Forecast for

Mount Sinai NY

Flood Watch July 28, 02:00pm until July 29, 08:00pm
Click here for hazard details and duration
Flood Watch

  • Today

    Today: A slight chance of showers, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 81. South wind 9 to 15 mph. Chance of precipitation is 30%.

    High: 81 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 8pm. Low around 68. Southeast wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    Low: 68 °F

    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm before 11am, then showers likely between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 78. Southeast wind around 9 mph. Chance of precipitation is 70%. New rainfall amounts between 1 and 2 inches possible.

    High: 78 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely after 11pm. Mostly cloudy, with a low around 66. East wind 7 to 9 mph becoming north in the evening. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 66 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 78. North wind around 11 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 78 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of showers, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 81. South wind 9 to 15 mph. Chance of precipitation is 30%.
Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 8pm. Low around 68. Southeast wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Wednesday
Showers likely and possibly a thunderstorm before 11am, then showers likely between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 78. Southeast wind around 9 mph. Chance of precipitation is 70%. New rainfall amounts between 1 and 2 inches possible.
Wednesday Night
A chance of showers and thunderstorms, then showers likely after 11pm. Mostly cloudy, with a low around 66. East wind 7 to 9 mph becoming north in the evening. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 78. North wind around 11 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 65.
Friday
Mostly sunny, with a high near 80.
Friday Night
Partly cloudy, with a low around 67.
Saturday
Mostly sunny, with a high near 80.
Saturday Night
Mostly cloudy, with a low around 69.
Sunday
Partly sunny, with a high near 81.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 69.
Monday
A 30 percent chance of showers. Partly sunny, with a high near 81.
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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:
2:31 am EDT Jul 28, 2026
Forecast Valid:
9am EDT Jul 28, 2026-6pm EDT Aug 3, 2026
 
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