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

Flash Flooding and Severe Thunderstorms Tuesday, July 28th - Wednesday, July 29th

Scattered to numerous thunderstorms are likely across the region Tuesday, July 28th through Wednesday, July 29th which will bring a risk of flash flooding and severe thunderstorms across the entire region. View this briefing for the details regarding these hazards. Read More >

Hazardous Weather Conditions

Current conditions at

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Mostly Cloudy

69°F

21°C

Humidity 96%
Wind Speed SW 5 mph
Barometer 29.58 in (1001.0 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 28 Jul 11:53 pm EDT
Extended Forecast for

Rocky Hill NJ

Flood Watch July 29, 12:38am until July 29, 08:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch July 29, 12:38am until July 29, 08:00pm

    NOW until 8:00pm Wed

    Flood Watch

  • Overnight

    Low: 64 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 79. Northwest wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.

    High: 79 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Northwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 61 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 79. North wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 61. North wind around 5 mph becoming calm. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 61 °F

    Showers
    Likely then
    Partly Cloudy

  • Friday

    Friday: A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 85. Chance of precipitation is 20%.

    High: 85 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

Detailed Forecast

Overnight
Showers likely and possibly a thunderstorm before 3am, then a chance of showers and thunderstorms after 3am. Cloudy, with a low around 64. South wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 79. Northwest wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Northwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 79. North wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 61. North wind around 5 mph becoming calm. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 85. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 63.
Saturday
Mostly sunny, with a high near 86.
Saturday Night
Mostly cloudy, with a low around 65.
Sunday
A chance of showers after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 30%.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 40%.
Monday
A chance of showers. Partly sunny, with a high near 83. Chance of precipitation is 50%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.
Tuesday
A chance of showers. Mostly sunny, with a high near 85. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Rocky Hill NJ
 40.41°N 74.63°W (Elev. 98 ft)
Last Update:
9:07 pm EDT Jul 28, 2026
Forecast Valid:
12am EDT Jul 29, 2026-6pm EDT Aug 4, 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