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

44°F

7°C

Humidity 83%
Wind Speed N 5 mph
Barometer 30.28 in (1024.7 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 4 Mar 10:53 am EST
Extended Forecast for

Princeton Junction NJ

  • Today

    Today: A slight chance of rain before noon, then a slight chance of rain after 4pm. Mostly cloudy, with a high near 50. Calm wind. Chance of precipitation is 20%.

    High: 50 °F

    Slight Chance
    Rain

  • Tonight

    Tonight: Rain likely, mainly after 5am. Patchy fog after 10pm. Otherwise, cloudy, with a low around 38. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 38 °F

    Rain Likely
    and Patchy
    Fog

  • Thursday

    Thursday: Showers. Areas of fog before 1pm. High near 47. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 47 °F

    Showers and
    Areas Fog

  • Thursday Night

    Thursday Night: Showers. Patchy fog after 1am. Low around 39. East wind around 5 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 39 °F

    Showers and
    Patchy Fog

  • Friday

    Friday: A slight chance of showers before 1pm. Patchy fog before 10am. Otherwise, cloudy, with a high near 47. Northeast wind around 5 mph. Chance of precipitation is 20%.

    High: 47 °F

    Slight Chance
    Showers and
    Patchy Fog

  • Friday Night

    Friday Night: A slight chance of showers after 1am. Cloudy, with a low around 40. Chance of precipitation is 20%.

    Low: 40 °F

    Cloudy then
    Slight Chance
    Showers

  • Saturday

    Saturday: Mostly cloudy, with a high near 66.

    High: 66 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Showers likely before 1am. Mostly cloudy, with a low around 49. Chance of precipitation is 70%.

    Low: 49 °F

    Showers
    Likely

  • Sunday

    Sunday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of rain before noon, then a slight chance of rain after 4pm. Mostly cloudy, with a high near 50. Calm wind. Chance of precipitation is 20%.
Tonight
Rain likely, mainly after 5am. Patchy fog after 10pm. Otherwise, cloudy, with a low around 38. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Showers. Areas of fog before 1pm. High near 47. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Showers. Patchy fog after 1am. Low around 39. East wind around 5 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Friday
A slight chance of showers before 1pm. Patchy fog before 10am. Otherwise, cloudy, with a high near 47. Northeast wind around 5 mph. Chance of precipitation is 20%.
Friday Night
A slight chance of showers after 1am. Cloudy, with a low around 40. Chance of precipitation is 20%.
Saturday
Mostly cloudy, with a high near 66.
Saturday Night
Showers likely before 1am. Mostly cloudy, with a low around 49. Chance of precipitation is 70%.
Sunday
Mostly sunny, with a high near 63.
Sunday Night
Partly cloudy, with a low around 45.
Monday
Sunny, with a high near 68.
Monday Night
Mostly clear, with a low around 47.
Tuesday
Mostly sunny, with a high near 72.
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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:
4:10 am EST Mar 4, 2026
Forecast Valid:
11am EST Mar 4, 2026-6pm EDT Mar 10, 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