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

44°F

7°C

Humidity 41%
Wind Speed S 5 mph
Barometer 30.08 in (1018.2 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 27 Feb 2:53 pm EST
Extended Forecast for

Princeton Junction NJ

  • This Afternoon

    This Afternoon: Sunny, with a high near 46. Calm wind.

    High: 46 °F

    Sunny

  • Tonight

    Tonight: Patchy fog after 1am. Otherwise, partly cloudy, with a low around 24. Calm wind.

    Low: 24 °F

    Partly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 51. Calm wind becoming southwest around 5 mph.

    High: 51 °F

    Patchy Fog
    then Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 30. Calm wind becoming northeast around 5 mph.

    Low: 30 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of rain and snow showers before 1pm. Mostly cloudy, with a high near 42. East wind 5 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 50%. Little or no snow accumulation expected.

    High: 42 °F

    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 17.

    Low: 17 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 32.

    High: 32 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A chance of snow after 1am. Mostly cloudy, with a low around 17. Chance of precipitation is 30%.

    Low: 17 °F

    Mostly Cloudy
    then Chance
    Snow

  • Tuesday

    Tuesday: A chance of rain and snow before 1pm, then rain likely. Cloudy, with a high near 41. Chance of precipitation is 60%.

    High: 41 °F

    Rain/Snow
    Likely

Detailed Forecast

This Afternoon
Sunny, with a high near 46. Calm wind.
Tonight
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 24. Calm wind.
Saturday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 51. Calm wind becoming southwest around 5 mph.
Saturday Night
Mostly cloudy, with a low around 30. Calm wind becoming northeast around 5 mph.
Sunday
A chance of rain and snow showers before 1pm. Mostly cloudy, with a high near 42. East wind 5 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 50%. Little or no snow accumulation expected.
Sunday Night
Partly cloudy, with a low around 17.
Monday
Mostly cloudy, with a high near 32.
Monday Night
A chance of snow after 1am. Mostly cloudy, with a low around 17. Chance of precipitation is 30%.
Tuesday
A chance of rain and snow before 1pm, then rain likely. Cloudy, with a high near 41. Chance of precipitation is 60%.
Tuesday Night
Rain. Low around 35. Chance of precipitation is 80%.
Wednesday
A chance of rain. Cloudy, with a high near 50. Chance of precipitation is 30%.
Wednesday Night
A chance of rain. Cloudy, with a low around 34. Chance of precipitation is 30%.
Thursday
A chance of rain. Cloudy, with a high near 54. Chance of precipitation is 40%.
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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:
1:31 pm EST Feb 27, 2026
Forecast Valid:
2pm EST Feb 27, 2026-6pm EST Mar 5, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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