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

42°F

6°C

Humidity 76%
Wind Speed SW 7 mph
Barometer 29.37 in (994.1 mb)
Dewpoint 35°F (2°C)
Visibility NA
Wind Chill38°F (3°C)
Last update 15 Jan 2:53 am EST
Extended Forecast for

Princeton Junction NJ

  • Overnight

    Overnight: A chance of rain. Cloudy, with a low around 37. Southwest wind around 5 mph. Chance of precipitation is 50%.

    Low: 37 °F

    Chance Rain

  • Thursday

    Thursday: A chance of rain, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 31 by 5pm. Breezy, with a west wind 15 to 20 mph. Chance of precipitation is 30%.

    High: 39 °F⇓

    Breezy.
    Chance Rain
    then Partly
    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 21. Breezy, with a west wind 15 to 20 mph.

    Low: 21 °F

    Mostly Cloudy
    and Breezy
    then Partly
    Cloudy

  • Friday

    Friday: Sunny, with a high near 35. West wind 10 to 15 mph.

    High: 35 °F

    Sunny

  • Friday Night

    Friday Night: A slight chance of snow after 1am. Mostly cloudy, with a low around 26. South wind around 5 mph. Chance of precipitation is 20%.

    Low: 26 °F

    Partly Cloudy
    then Slight
    Chance Snow

  • Saturday

    Saturday: A chance of snow before 1pm, then a chance of rain and snow between 1pm and 4pm, then a chance of rain after 4pm. Mostly cloudy, with a high near 42. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

    High: 42 °F

    Chance Snow
    then Chance
    Rain/Snow

  • Saturday Night

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

    Low: 27 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of snow. Mostly cloudy, with a high near 34. Chance of precipitation is 30%.

    High: 34 °F

    Chance Snow

  • Sunday Night

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

    Low: 17 °F

    Partly Cloudy

Detailed Forecast

Overnight
A chance of rain. Cloudy, with a low around 37. Southwest wind around 5 mph. Chance of precipitation is 50%.
Thursday
A chance of rain, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 31 by 5pm. Breezy, with a west wind 15 to 20 mph. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 21. Breezy, with a west wind 15 to 20 mph.
Friday
Sunny, with a high near 35. West wind 10 to 15 mph.
Friday Night
A slight chance of snow after 1am. Mostly cloudy, with a low around 26. South wind around 5 mph. Chance of precipitation is 20%.
Saturday
A chance of snow before 1pm, then a chance of rain and snow between 1pm and 4pm, then a chance of rain after 4pm. Mostly cloudy, with a high near 42. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Mostly cloudy, with a low around 27.
Sunday
A chance of snow. Mostly cloudy, with a high near 34. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 17.
M.L.King Day
Sunny, with a high near 30.
Monday Night
Partly cloudy, with a low around 13.
Tuesday
Sunny, with a high near 23.
Tuesday Night
Mostly clear, with a low around 9.
Wednesday
Mostly sunny, with a high near 28.
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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:
2:35 am EST Jan 15, 2026
Forecast Valid:
3am EST Jan 15, 2026-6pm EST Jan 21, 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