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.

Fair

43°F

6°C

Humidity 87%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 10 Mar 7:53 am EDT
Extended Forecast for

Princeton Junction NJ

  • Today

    Today: Areas of dense fog before 9am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 78. Southwest wind 5 to 10 mph.

    High: 78 °F

    Areas Dense
    Fog then
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 50. South wind around 5 mph.

    Low: 50 °F

    Mostly Clear

  • Wednesday

    Wednesday: A chance of showers after 2pm. Partly sunny, with a high near 76. Light and variable wind becoming south 5 to 10 mph in the morning. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 76 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 56. South wind 10 to 15 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 56 °F

    Chance
    Showers

  • Thursday

    Thursday: Showers likely, mainly before 2pm. Cloudy, with a high near 60. Northwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 60 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers before 8pm. Partly cloudy, with a low around 30. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 30 °F

    Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Partly sunny, with a high near 49.

    High: 49 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

Detailed Forecast

Today
Areas of dense fog before 9am. Otherwise, partly sunny, then gradually becoming sunny, with a high near 78. Southwest wind 5 to 10 mph.
Tonight
Mostly clear, with a low around 50. South wind around 5 mph.
Wednesday
A chance of showers after 2pm. Partly sunny, with a high near 76. Light and variable wind becoming south 5 to 10 mph in the morning. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 56. South wind 10 to 15 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Showers likely, mainly before 2pm. Cloudy, with a high near 60. Northwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
A chance of showers before 8pm. Partly cloudy, with a low around 30. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Partly sunny, with a high near 49.
Friday Night
Mostly cloudy, with a low around 37.
Saturday
Mostly sunny, with a high near 52.
Saturday Night
Mostly cloudy, with a low around 35.
Sunday
Cloudy, with a high near 58.
Sunday Night
Rain. Low around 45. Chance of precipitation is 90%.
Monday
Rain. High near 57. Chance of precipitation is 80%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.3°N 74.62°W (Elev. 98 ft)
Last Update:
4:08 am EDT Mar 10, 2026
Forecast Valid:
8am EDT Mar 10, 2026-6pm EDT Mar 16, 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