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

57°F

14°C

Humidity 58%
Wind Speed SW 9 mph
Barometer 29.97 in (1014.4 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 26 Mar 9:53 am EDT
Extended Forecast for

Princeton Junction NJ

  • Today

    Today: Mostly sunny, with a high near 74. Southwest wind 10 to 15 mph.

    High: 74 °F

    Mostly Sunny

  • Tonight

    Tonight: Showers, mainly after 1am. Low around 51. Southwest wind 10 to 15 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 51 °F

    Chance
    Showers then
    Showers

  • Friday

    Friday: Showers, mainly before noon. High near 56. North wind around 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 56 °F

    Showers then
    Chance
    Showers

  • Friday Night

    Friday Night: A chance of rain before 2am, then a slight chance of rain and snow. Cloudy, then gradually becoming partly cloudy, with a low around 31. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 31 °F

    Chance Rain
    then Chance
    Rain/Snow

  • Saturday

    Saturday: Sunny, with a high near 44. Northwest wind 10 to 15 mph.

    High: 44 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 62.

    High: 62 °F

    Mostly Cloudy

Detailed Forecast

Today
Mostly sunny, with a high near 74. Southwest wind 10 to 15 mph.
Tonight
Showers, mainly after 1am. Low around 51. Southwest wind 10 to 15 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Showers, mainly before noon. High near 56. North wind around 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
A chance of rain before 2am, then a slight chance of rain and snow. Cloudy, then gradually becoming partly cloudy, with a low around 31. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 30%. Little or no snow accumulation expected.
Saturday
Sunny, with a high near 44. Northwest wind 10 to 15 mph.
Saturday Night
Partly cloudy, with a low around 28.
Sunday
Mostly sunny, with a high near 54.
Sunday Night
Partly cloudy, with a low around 38.
Monday
Mostly cloudy, with a high near 62.
Monday Night
A chance of rain. Mostly cloudy, with a low around 48. Chance of precipitation is 30%.
Tuesday
A chance of rain. Mostly cloudy, with a high near 64. Chance of precipitation is 40%.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 46. Chance of precipitation is 50%.
Wednesday
A chance of rain. Partly sunny, with a high near 63. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.32°N 74.62°W (Elev. 85 ft)
Last Update:
4:10 am EDT Mar 26, 2026
Forecast Valid:
10am EDT Mar 26, 2026-6pm EDT Apr 1, 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