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

Hazardous Weather Conditions

Current conditions at

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Fair

86°F

30°C

Humidity 63%
Wind Speed Calm
Barometer 30.02 in (1015.9 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 15 Jul 5:53 pm EDT
Extended Forecast for

Princeton North NJ

Flood Watch July 16, 03:00pm until July 17, 03:00am
Click here for hazard details and duration
Flood Watch

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 72. South wind around 5 mph becoming calm. Chance of precipitation is 20%.

    Low: 72 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly after 5pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 91. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 91 °F

    Partly Sunny
    then Heavy
    Rain

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely, mainly before 8pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 73. Southwest wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 73 °F

    Heavy Rain

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 92. Heat index values as high as 102. Southwest 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: 92 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 8pm. Partly cloudy, with a low around 75. Southwest wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 75 °F

    Showers
    Likely then
    Partly Cloudy

  • Friday

    Friday: A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Chance of precipitation is 20%.

    High: 88 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers after 2am. Mostly cloudy, with a low around 68. Chance of precipitation is 40%.

    Low: 68 °F

    Partly Cloudy
    then Chance
    Showers

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 72. South wind around 5 mph becoming calm. Chance of precipitation is 20%.
Wednesday
Showers and thunderstorms likely, mainly after 5pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 91. Calm wind becoming south around 5 mph in the afternoon. 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 and thunderstorms likely, mainly before 8pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 73. Southwest wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 92. Heat index values as high as 102. Southwest 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 75. Southwest wind around 5 mph. 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 88. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 66.
Saturday
Mostly sunny, with a high near 85.
Saturday Night
A chance of showers after 2am. Mostly cloudy, with a low around 68. Chance of precipitation is 40%.
Sunday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 85. Chance of precipitation is 60%.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 30%.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 84. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton North NJ
 40.37°N 74.64°W (Elev. 98 ft)
Last Update:
4:13 pm EDT Jul 15, 2025
Forecast Valid:
6pm EDT Jul 15, 2025-6pm EDT Jul 22, 2025
 
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