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.

A Few Clouds

47°F

8°C

Humidity 66%
Wind Speed NW 8 G 17 mph
Barometer 29.89 in (1011.7 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 7 Jan 5:53 pm EST
Extended Forecast for

Princeton Junction NJ

  • Tonight

    Tonight: Mostly clear, with a low around 32. West wind around 5 mph becoming calm in the evening.

    Low: 32 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 49. Calm wind.

    High: 49 °F

    Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 31. Calm wind.

    Low: 31 °F

    Increasing
    Clouds

  • Friday

    Friday: A chance of rain after 1pm. Mostly cloudy, with a high near 55. Calm wind becoming south around 5 mph in the morning. Chance of precipitation is 40%.

    High: 55 °F

    Mostly Cloudy
    then Chance
    Rain

  • Friday Night

    Friday Night: Rain likely. Cloudy, with a low around 48. South wind around 5 mph becoming calm after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 48 °F

    Rain Likely

  • Saturday

    Saturday: Rain. High near 60. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 60 °F

    Rain

  • Saturday Night

    Saturday Night: Rain, mainly before 1am. Low around 42. Chance of precipitation is 80%.

    Low: 42 °F

    Rain

  • Sunday

    Sunday: A chance of rain before 1pm. Mostly cloudy, with a high near 51. Chance of precipitation is 30%.

    High: 51 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 32. West wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 49. Calm wind.
Thursday Night
Increasing clouds, with a low around 31. Calm wind.
Friday
A chance of rain after 1pm. Mostly cloudy, with a high near 55. Calm wind becoming south around 5 mph in the morning. Chance of precipitation is 40%.
Friday Night
Rain likely. Cloudy, with a low around 48. South wind around 5 mph becoming calm after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Rain. High near 60. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
Rain, mainly before 1am. Low around 42. Chance of precipitation is 80%.
Sunday
A chance of rain before 1pm. Mostly cloudy, with a high near 51. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 27.
Monday
Sunny, with a high near 40.
Monday Night
Partly cloudy, with a low around 26.
Tuesday
Mostly sunny, with a high near 44.
Tuesday Night
Partly cloudy, with a low around 28.
Wednesday
Mostly cloudy, with a high near 45.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.32°N 74.62°W (Elev. 85 ft)
Last Update:
4:12 pm EST Jan 7, 2026
Forecast Valid:
6pm EST Jan 7, 2026-6pm EST Jan 14, 2026
 
Forecast Discussion
 
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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation