Briefing for Flash Flood, Severe Thunderstorm, and Heat Risks through Thursday

Scattered showers and thunderstorms with locally heavy rainfall may lead to areas of flash flooding through tonight. There is potential for isolated severe thunderstorms with damaging wind gusts tonight and Thursday. Hot and very humid conditions are expected Thursday. See this briefing for details on these threats. Read More >

Current conditions at

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Thunderstorm Heavy Rain Fog/Mist

76°F

24°C

Humidity 88%
Wind Speed SW 10 G 30 mph
Barometer 29.95 in (1013.5 mb)
Dewpoint 72°F (22°C)
Visibility 1.50 mi
Heat Index76°F (24°C)
Last update 16 Jul 7:53 pm EDT
Extended Forecast for

Princeton Junction NJ

Flood Watch until July 17, 03:00am
Heat Advisory July 17, 10:00am until July 17, 08:00pm
Click here for hazard details and duration
Flood Watch
Heat Advisory
  •  
    Flood Watch until July 17, 03:00am

    NOW until 3:00am Thu

    Flood Watch

  • Tonight

    Low: 73 °F

    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms before noon, then a slight chance of showers and thunderstorms after 3pm.  Mostly cloudy, then gradually becoming sunny, with a high near 92. West wind 5 to 10 mph.  Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 92 °F

    Chance
    T-storms then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 73. Southwest wind around 5 mph.

    Low: 73 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 86. Northwest wind around 5 mph.

    High: 86 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Clear

  • Saturday

    Saturday: A slight chance of showers after 2pm.  Mostly sunny, with a high near 87. Chance of precipitation is 20%.

    High: 87 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of thunderstorms before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then showers likely and possibly a thunderstorm after 2am.  Mostly cloudy, with a low around 70. Chance of precipitation is 60%.

    Low: 70 °F

    Chance
    T-storms then
    Showers
    Likely

  • Sunday

    Sunday: Showers likely, with thunderstorms also possible after 2pm.  Mostly cloudy, with a high near 86. Chance of precipitation is 60%.

    High: 86 °F

    Showers
    Likely

Detailed Forecast

Tonight
A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South wind around 5 mph becoming calm. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
A chance of showers and thunderstorms before noon, then a slight chance of showers and thunderstorms after 3pm. Mostly cloudy, then gradually becoming sunny, with a high near 92. West wind 5 to 10 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Partly cloudy, with a low around 73. Southwest wind around 5 mph.
Friday
Mostly sunny, with a high near 86. Northwest wind around 5 mph.
Friday Night
Mostly clear, with a low around 65. Calm wind.
Saturday
A slight chance of showers after 2pm. Mostly sunny, with a high near 87. Chance of precipitation is 20%.
Saturday Night
A chance of thunderstorms before 8pm, then a chance of showers and thunderstorms between 8pm and 2am, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.
Sunday
Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 86. Chance of precipitation is 60%.
Sunday Night
Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 66. Chance of precipitation is 60%.
Monday
Mostly sunny, with a high near 84.
Monday Night
Partly cloudy, with a low around 64.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
Partly cloudy, with a low around 66.
Wednesday
A chance of showers. Mostly 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)
4:12 pm EDT Jul 16, 2025
8pm EDT Jul 16, 2025-6pm EDT Jul 23, 2025
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database