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

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Light Rain

38°F

3°C

Humidity 97%
Wind Speed W 6 mph
Barometer 30.21 in (1022.6 mb)
Dewpoint 37°F (3°C)
Visibility 8.00 mi
Wind Chill33°F (1°C)
Last update 4 Mar 12:53 am EST
Extended Forecast for

Princeton Junction NJ

  • Overnight

    Overnight: Rain likely, mainly before 2am. Cloudy, with a low around 36. Southwest wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 36 °F

    Rain Likely

  • Wednesday

    Wednesday: A slight chance of rain after 3pm. Mostly cloudy, with a high near 54. Calm wind becoming north around 5 mph. Chance of precipitation is 20%.

    High: 54 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after 1am. Mostly cloudy, with a low around 37. Calm wind. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 37 °F

    Chance Rain
    then Rain
    Likely

  • Thursday

    Thursday: Showers likely, mainly before 1pm. Cloudy, with a high near 51. Calm wind becoming east around 5 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 51 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 41. Calm wind becoming east around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 41 °F

    Showers

  • Friday

    Friday: A slight chance of showers before 1pm. Mostly cloudy, with a high near 57. Chance of precipitation is 20%.

    High: 57 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 65.

    High: 65 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.

    Low: 54 °F

    Showers
    Likely

Detailed Forecast

Overnight
Rain likely, mainly before 2am. Cloudy, with a low around 36. Southwest wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
A slight chance of rain after 3pm. Mostly cloudy, with a high near 54. Calm wind becoming north around 5 mph. Chance of precipitation is 20%.
Wednesday Night
Rain likely, mainly after 1am. Mostly cloudy, with a low around 37. Calm wind. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
Showers likely, mainly before 1pm. Cloudy, with a high near 51. Calm wind becoming east around 5 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Showers and possibly a thunderstorm. Low around 41. Calm wind becoming east around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Friday
A slight chance of showers before 1pm. Mostly cloudy, with a high near 57. Chance of precipitation is 20%.
Friday Night
Mostly cloudy, with a low around 41.
Saturday
Mostly cloudy, with a high near 65.
Saturday Night
Showers likely, mainly before 1am. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.
Sunday
Partly sunny, with a high near 67.
Sunday Night
A chance of showers. Partly cloudy, with a low around 48. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 68.
Monday Night
Partly cloudy, with a low around 47.
Tuesday
Mostly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.3°N 74.62°W (Elev. 98 ft)
Last Update:
7:15 pm EST Mar 3, 2026
Forecast Valid:
1am EST Mar 4, 2026-6pm EDT Mar 10, 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