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.

Mostly Cloudy

32°F

0°C

Humidity 59%
Wind Speed SW 5 mph
Barometer 30.11 in (1019.2 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 14 Feb 9:53 am EST
Extended Forecast for

Princeton Junction NJ

  • Today

    Today: Mostly sunny, with a high near 43. West wind around 5 mph.

    High: 43 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 22. Calm wind.

    Low: 22 °F

    Partly Cloudy

  • Sunday

    Sunday: A slight chance of rain and snow between 1pm and 4pm, then a slight chance of snow after 4pm. Mostly cloudy, with a high near 40. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 40 °F

    Partly Sunny
    then Slight
    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: A chance of snow. Mostly cloudy, with a low around 28. Calm wind becoming northeast around 5 mph. Chance of precipitation is 40%. New snow accumulation of less than one inch possible.

    Low: 28 °F

    Chance Snow

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 42. Northeast wind around 5 mph becoming calm in the afternoon.

    High: 42 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of rain. Cloudy, with a high near 47. Chance of precipitation is 50%.

    High: 47 °F

    Chance Rain

Detailed Forecast

Today
Mostly sunny, with a high near 43. West wind around 5 mph.
Tonight
Partly cloudy, with a low around 22. Calm wind.
Sunday
A slight chance of rain and snow between 1pm and 4pm, then a slight chance of snow after 4pm. Mostly cloudy, with a high near 40. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 20%.
Sunday Night
A chance of snow. Mostly cloudy, with a low around 28. Calm wind becoming northeast around 5 mph. Chance of precipitation is 40%. New snow accumulation of less than one inch possible.
Washington's Birthday
Partly sunny, with a high near 42. Northeast wind around 5 mph becoming calm in the afternoon.
Monday Night
Mostly cloudy, with a low around 27.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
A chance of rain. Cloudy, with a high near 47. Chance of precipitation is 50%.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 35. Chance of precipitation is 50%.
Thursday
A chance of rain. Mostly cloudy, with a high near 50. Chance of precipitation is 30%.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 31. Chance of precipitation is 40%.
Friday
A chance of rain and snow. Mostly cloudy, with a high near 42. Chance of precipitation is 50%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.3°N 74.62°W (Elev. 98 ft)
Last Update:
4:15 am EST Feb 14, 2026
Forecast Valid:
10am EST Feb 14, 2026-6pm EST Feb 20, 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