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.

Partly Cloudy

41°F

5°C

Humidity 43%
Wind Speed NW 6 mph
Barometer 30.15 in (1020.3 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 27 Mar 8:53 pm EDT
Extended Forecast for

Princeton Junction NJ

  • Tonight

    Tonight: Mostly cloudy, with a low around 29. North wind around 5 mph.

    Low: 29 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 45. North wind 10 to 15 mph.

    High: 45 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 24. Northwest wind around 5 mph becoming calm in the evening.

    Low: 24 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 55. Light south wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 55 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 41. South wind around 5 mph.

    Low: 41 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 62.

    High: 62 °F

    Partly Sunny

  • Monday Night

    Monday Night: A chance of rain after 2am. Mostly cloudy, with a low around 52. Chance of precipitation is 30%.

    Low: 52 °F

    Mostly Cloudy
    then Chance
    Rain

  • Tuesday

    Tuesday: A chance of rain before 8am. Partly sunny, with a high near 76. Chance of precipitation is 30%.

    High: 76 °F

    Chance Rain
    then Partly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 29. North wind around 5 mph.
Saturday
Sunny, with a high near 45. North wind 10 to 15 mph.
Saturday Night
Mostly clear, with a low around 24. Northwest wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 55. Light south wind becoming southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Sunday Night
Mostly cloudy, with a low around 41. South wind around 5 mph.
Monday
Partly sunny, with a high near 62.
Monday Night
A chance of rain after 2am. Mostly cloudy, with a low around 52. Chance of precipitation is 30%.
Tuesday
A chance of rain before 8am. Partly sunny, with a high near 76. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 61.
Wednesday
A chance of rain after 2pm. Partly sunny, with a high near 80. Chance of precipitation is 40%.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 46. Chance of precipitation is 50%.
Thursday
A chance of rain. Mostly cloudy, with a high near 57. Chance of precipitation is 40%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 40. Chance of precipitation is 60%.
Friday
Rain likely. Cloudy, with a high near 49. Chance of precipitation is 60%.
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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:
4:10 pm EDT Mar 27, 2026
Forecast Valid:
9pm EDT Mar 27, 2026-6pm EDT Apr 3, 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