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

Heavy to Excessive Rainfall and Flooding Threats in the Central and Eastern U.S.; Heat and Fire Weather Concerns in the West

Thunderstorms producing excessive rainfall and potential flooding concerns will continue through tonight from the Southern Plains to the East Coast. Areas of greatest concern for flooding are over central Texas and the Mid-Atlantic. Heat will continue to build across the West through Tuesday. Heat Advisories and Extreme Heat Warnings are in effect. Fire Weather concerns continue through Monday. Read More >

Hazardous Weather Conditions

Current conditions at

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Overcast

75°F

24°C

Humidity 90%
Wind Speed S 6 mph
Barometer 30.06 in (1017.3 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 14 Jul 12:53 am EDT
Extended Forecast for

Princeton Junction NJ

Flood Watch July 14, 02:00pm until July 15, 02:00am
Click here for hazard details and duration
Flood Watch

  • Overnight

    Overnight: Mostly cloudy, with a low around 70. South wind around 5 mph.

    Low: 70 °F

    Mostly Cloudy

  • Monday

    Monday: Showers and thunderstorms likely, mainly after 3pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 87. South wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 87 °F

    Patchy Fog
    then T-storms
    Likely

  • Monday Night

    Monday Night: Showers and thunderstorms before 2am, then showers likely and possibly a thunderstorm between 2am and 5am, then a chance of showers and thunderstorms after 5am. Patchy fog before 2am, then patchy fog after 5am. Low around 71. South wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

    Low: 71 °F

    T-storms and
    Patchy Fog
    then Showers
    Likely and
    Patchy Fog

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Some of the storms could produce heavy rainfall. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 86. Calm wind becoming southeast around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 86 °F

    Heavy Rain
    and Patchy
    Fog

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then a chance of showers after 11pm. Mostly cloudy, with a low around 72. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 72 °F

    Showers
    Likely then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 88. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 88 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 60%.

    Low: 73 °F

    Showers
    Likely then
    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 91. Chance of precipitation is 50%.

    High: 91 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 75. Chance of precipitation is 30%.

    Low: 75 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Mostly cloudy, with a low around 70. South wind around 5 mph.
Monday
Showers and thunderstorms likely, mainly after 3pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 87. South wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday Night
Showers and thunderstorms before 2am, then showers likely and possibly a thunderstorm between 2am and 5am, then a chance of showers and thunderstorms after 5am. Patchy fog before 2am, then patchy fog after 5am. Low around 71. South wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Some of the storms could produce heavy rainfall. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 86. Calm wind becoming southeast around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then a chance of showers after 11pm. Mostly cloudy, with a low around 72. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 88. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 60%.
Thursday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 91. Chance of precipitation is 50%.
Thursday Night
A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 75. Chance of precipitation is 30%.
Friday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Chance of precipitation is 40%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Chance of precipitation is 30%.
Saturday
A chance of showers. Mostly sunny, with a high near 89. Chance of precipitation is 40%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 69. Chance of precipitation is 30%.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.3°N 74.62°W (Elev. 98 ft)
Last Update:
1:12 am EDT Jul 14, 2025
Forecast Valid:
1am EDT Jul 14, 2025-6pm EDT Jul 20, 2025
 
Forecast Discussion
 
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Additional Resources

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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