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

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across much of northeast Texas into the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Saturday could bring areas of flooding across parts of the central Plains into the upper Midwest/Great Lakes, and Four Corners states. Read More >

Current conditions at

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Overcast

79°F

26°C

Humidity 72%
Wind Speed SW 6 mph
Barometer 30.10 in (1018.5 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 17 Sep 6:53 pm EDT
Extended Forecast for

Rocky Hill NJ

  • Tonight

    Tonight: A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 2am. Mostly cloudy, with a low around 67. South wind around 5 mph becoming calm. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    Chance
    Showers

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 83. North wind around 5 mph.

    High: 83 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 57. North wind around 5 mph.

    Low: 57 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 74. Northeast wind around 5 mph.

    High: 74 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers after 2am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 60. Southeast wind around 5 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 60 °F

    Mostly Cloudy
    then Chance
    Showers and
    Patchy Fog

  • Sunday

    Sunday: Showers likely, then showers and possibly a thunderstorm after 2pm. Patchy fog before 8am. High near 72. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 72 °F

    Showers and
    Patchy Fog

  • Sunday Night

    Sunday Night: Showers, mainly before 2am. Low around 59. Chance of precipitation is 80%.

    Low: 59 °F

    Showers

  • Monday

    Monday: A chance of showers. Mostly cloudy, with a high near 69. Chance of precipitation is 40%.

    High: 69 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 40%.

    Low: 54 °F

    Chance
    Showers

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 2am. Mostly cloudy, with a low around 67. South wind around 5 mph becoming calm. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 83. North wind around 5 mph.
Friday Night
Partly cloudy, with a low around 57. North wind around 5 mph.
Saturday
Mostly sunny, with a high near 74. Northeast wind around 5 mph.
Saturday Night
A chance of showers after 2am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 60. Southeast wind around 5 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
Showers likely, then showers and possibly a thunderstorm after 2pm. Patchy fog before 8am. High near 72. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
Showers, mainly before 2am. Low around 59. Chance of precipitation is 80%.
Monday
A chance of showers. Mostly cloudy, with a high near 69. Chance of precipitation is 40%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 40%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 50%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 50. Chance of precipitation is 30%.
Wednesday
A chance of showers. Partly sunny, with a high near 62. Chance of precipitation is 30%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 51. Chance of precipitation is 30%.
Thursday
A chance of showers. Partly sunny, with a high near 64. 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:
4:09 pm EDT Sep 17, 2026
Forecast Valid:
7pm EDT Sep 17, 2026-6pm EDT Sep 24, 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