Current conditions at

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Overcast

72°F

22°C

Humidity 97%
Wind Speed Calm
Barometer 30.07 in (1017.5 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 15 Jul 6:53 am EDT
Extended Forecast for

Princeton NJ

  • Today

    Today: A chance of showers and thunderstorms before noon, then a chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 86. Calm wind.  Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tonight

    Tonight: A chance of thunderstorms before 8pm.  Partly cloudy, with a low around 72. Calm wind.  Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 72 °F

    Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm.  Partly sunny, with a high near 90. Calm wind becoming southwest around 5 mph in the afternoon.  Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Chance
    Showers then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 2am, then a chance of showers and thunderstorms after 2am.  Mostly cloudy, with a low around 73. Southwest wind around 5 mph.  Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 73 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 11am, then a chance of showers and thunderstorms after 11am.  Partly sunny, with a high near 90. Southwest wind around 5 mph.  Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 90 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy

  • Friday

    Friday: A chance of showers and thunderstorms after 2pm.  Mostly sunny, with a high near 89. Chance of precipitation is 50%.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 8pm.  Partly cloudy, with a low around 67. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    T-storms then
    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

Detailed Forecast

Today
A chance of showers and thunderstorms before noon, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86. Calm wind. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
A chance of thunderstorms before 8pm. Partly cloudy, with a low around 72. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 90. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers likely and possibly a thunderstorm before 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 73. Southwest wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 11am, then a chance of showers and thunderstorms after 11am. Partly sunny, with a high near 90. Southwest wind around 5 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 74.
Friday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89. Chance of precipitation is 50%.
Friday Night
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 67. Chance of precipitation is 30%.
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 30%.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 86. Chance of precipitation is 60%.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 69. Chance of precipitation is 60%.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 30%.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJ
 40.35°N 74.67°W (Elev. 190 ft)
4:13 am EDT Jul 15, 2025
7am EDT Jul 15, 2025-6pm EDT Jul 21, 2025
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database