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.

Fog/Mist

40°F

4°C

Humidity 100%
Wind Speed NE 7 mph
Barometer 30.22 in (1023.0 mb)
Dewpoint 40°F (4°C)
Visibility 1.25 mi
Wind Chill35°F (2°C)
Last update 5 Mar 6:53 pm EST
Extended Forecast for

Princeton Junction NJ

  • Tonight

    Tonight: Rain, mainly before 4am. Areas of fog. Low around 36. East wind around 5 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 36 °F

    Rain and
    Areas Fog

  • Friday

    Friday: Patchy fog before 11am. Otherwise, cloudy, with a high near 44. Northeast wind around 5 mph.

    High: 44 °F

    Patchy Fog
    then Cloudy

  • Friday Night

    Friday Night: A chance of rain, mainly after 1am. Patchy fog after 11pm. Otherwise, cloudy, with a low around 37. East wind around 5 mph becoming calm. Chance of precipitation is 40%.

    Low: 37 °F

    Chance Rain
    and Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 1pm. Otherwise, cloudy, with a high near 58. Calm wind becoming south around 5 mph.

    High: 58 °F

    Patchy Fog

  • Saturday Night

    Saturday Night: Showers likely. Patchy fog before 1am. Otherwise, mostly cloudy, with a low around 50. Southwest wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 50 °F

    Showers
    Likely and
    Patchy Fog

  • Sunday

    Sunday: A slight chance of showers. Partly sunny, with a high near 67. Chance of precipitation is 20%.

    High: 67 °F

    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 67.

    High: 67 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

Detailed Forecast

Tonight
Rain, mainly before 4am. Areas of fog. Low around 36. East wind around 5 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Patchy fog before 11am. Otherwise, cloudy, with a high near 44. Northeast wind around 5 mph.
Friday Night
A chance of rain, mainly after 1am. Patchy fog after 11pm. Otherwise, cloudy, with a low around 37. East wind around 5 mph becoming calm. Chance of precipitation is 40%.
Saturday
Patchy fog before 1pm. Otherwise, cloudy, with a high near 58. Calm wind becoming south around 5 mph.
Saturday Night
Showers likely. Patchy fog before 1am. Otherwise, mostly cloudy, with a low around 50. Southwest wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Sunday
A slight chance of showers. Partly sunny, with a high near 67. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 43.
Monday
Mostly sunny, with a high near 67.
Monday Night
Mostly clear, with a low around 49.
Tuesday
Mostly sunny, with a high near 73.
Tuesday Night
Mostly cloudy, with a low around 53.
Wednesday
A chance of rain. Mostly cloudy, with a high near 73. Chance of precipitation is 30%.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 47. Chance of precipitation is 60%.
Thursday
A chance of rain. Mostly cloudy, with a high near 57. Chance of precipitation is 50%.
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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:
4:09 pm EST Mar 5, 2026
Forecast Valid:
7pm EST Mar 5, 2026-6pm EDT Mar 12, 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