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.

Overcast

34°F

1°C

Humidity 89%
Wind Speed SW 8 mph
Barometer 30.14 in (1020.4 mb)
Dewpoint 31°F (-1°C)
Visibility 7.00 mi
Wind Chill27°F (-3°C)
Last update 17 Feb 4:53 am EST
Extended Forecast for

Princeton Junction NJ

  • Today

    Today: Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 45. Calm wind becoming southwest around 5 mph.

    High: 45 °F

    Patchy Fog
    then Partly
    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 34. Calm wind.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Rain likely, mainly after 1pm. Cloudy, with a high near 47. Calm wind becoming southeast around 5 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 47 °F

    Rain Likely

  • Wednesday Night

    Wednesday Night: A chance of rain before 1am. Mostly cloudy, with a low around 36. West wind around 5 mph becoming north after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 36 °F

    Chance Rain

  • Thursday

    Thursday: A slight chance of rain after 1pm. Mostly cloudy, with a high near 46. North wind around 5 mph becoming east in the afternoon. Chance of precipitation is 20%.

    High: 46 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: A chance of rain before 10pm, then a chance of rain and snow. Cloudy, with a low around 33. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 33 °F

    Chance
    Rain/Snow

  • Friday

    Friday: Rain. High near 44. Chance of precipitation is 90%.

    High: 44 °F

    Rain

  • Friday Night

    Friday Night: A chance of rain. Mostly cloudy, with a low around 35. Chance of precipitation is 40%.

    Low: 35 °F

    Chance Rain

  • Saturday

    Saturday: A chance of rain before 1pm. Partly sunny, with a high near 46. Chance of precipitation is 30%.

    High: 46 °F

    Chance Rain

Detailed Forecast

Today
Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 45. Calm wind becoming southwest around 5 mph.
Tonight
Mostly cloudy, with a low around 34. Calm wind.
Wednesday
Rain likely, mainly after 1pm. Cloudy, with a high near 47. Calm wind becoming southeast around 5 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A chance of rain before 1am. Mostly cloudy, with a low around 36. West wind around 5 mph becoming north after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A slight chance of rain after 1pm. Mostly cloudy, with a high near 46. North wind around 5 mph becoming east in the afternoon. Chance of precipitation is 20%.
Thursday Night
A chance of rain before 10pm, then a chance of rain and snow. Cloudy, with a low around 33. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain. High near 44. Chance of precipitation is 90%.
Friday Night
A chance of rain. Mostly cloudy, with a low around 35. Chance of precipitation is 40%.
Saturday
A chance of rain before 1pm. Partly sunny, with a high near 46. Chance of precipitation is 30%.
Saturday Night
A chance of rain and snow after 1am. Mostly cloudy, with a low around 30. Chance of precipitation is 30%.
Sunday
A chance of rain and snow. Partly sunny, with a high near 40. Chance of precipitation is 50%.
Sunday Night
A chance of snow. Mostly cloudy, with a low around 26. Chance of precipitation is 40%.
Monday
Partly sunny, with a high near 38.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.32°N 74.62°W (Elev. 85 ft)
Last Update:
4:13 am EST Feb 17, 2026
Forecast Valid:
5am EST Feb 17, 2026-6pm EST Feb 23, 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