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.

Fair

46°F

8°C

Humidity 44%
Wind Speed W 5 mph
Barometer 30.06 in (1017.4 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 14 Feb 4:53 pm EST
Extended Forecast for

Princeton Junction NJ

  • Tonight

    Tonight: Patchy freezing fog before 11pm, then patchy freezing fog after 1am. Increasing clouds, with a low around 23. Calm wind.

    Low: 23 °F

    Patchy
    Freezing Fog

  • Sunday

    Sunday: A slight chance of rain and snow between 4pm and 5pm, then a slight chance of rain after 5pm. Patchy freezing fog before 9am. Mostly cloudy, with a high near 41. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 41 °F

    Patchy
    Freezing Fog
    then Slight
    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Snow, mainly between 10pm and 1am. Low around 29. Northeast wind 5 to 10 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.

    Low: 29 °F

    Snow

  • Washington's Birthday

    Washington's Birthday: Mostly cloudy, with a high near 40. Northeast wind 5 to 10 mph.

    High: 40 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 28. Calm wind.

    Low: 28 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 45.

    High: 45 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of rain after 1pm. Mostly cloudy, with a high near 45. Chance of precipitation is 40%.

    High: 45 °F

    Cloudy then
    Chance Rain

  • Wednesday Night

    Wednesday Night: A chance of rain before 1am. Mostly cloudy, with a low around 37. Chance of precipitation is 40%.

    Low: 37 °F

    Chance Rain

Detailed Forecast

Tonight
Patchy freezing fog before 11pm, then patchy freezing fog after 1am. Increasing clouds, with a low around 23. Calm wind.
Sunday
A slight chance of rain and snow between 4pm and 5pm, then a slight chance of rain after 5pm. Patchy freezing fog before 9am. Mostly cloudy, with a high near 41. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 20%.
Sunday Night
Snow, mainly between 10pm and 1am. Low around 29. Northeast wind 5 to 10 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Washington's Birthday
Mostly cloudy, with a high near 40. Northeast wind 5 to 10 mph.
Monday Night
Mostly cloudy, with a low around 28. Calm wind.
Tuesday
Partly sunny, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
A chance of rain after 1pm. Mostly cloudy, with a high near 45. Chance of precipitation is 40%.
Wednesday Night
A chance of rain before 1am. Mostly cloudy, with a low around 37. Chance of precipitation is 40%.
Thursday
A chance of rain. Partly sunny, with a high near 51. Chance of precipitation is 30%.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 35. Chance of precipitation is 40%.
Friday
A chance of rain. Mostly cloudy, with a high near 47. Chance of precipitation is 50%.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 33. Chance of precipitation is 40%.
Saturday
A chance of rain and snow. Mostly cloudy, with a high near 46. Chance of precipitation is 30%.
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:
4:17 pm EST Feb 14, 2026
Forecast Valid:
5pm EST Feb 14, 2026-6pm EST Feb 21, 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