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

52°F

11°C

Humidity 100%
Wind Speed Calm
Barometer 30.12 in (1019.3 mb)
Dewpoint 52°F (11°C)
Visibility 1.00 mi
Last update 4 Apr 5:53 am EDT
Extended Forecast for

Princeton Junction NJ

  • Today

    Today: A chance of showers, mainly between 2pm and 3pm. Patchy fog before 8am. Otherwise, increasing clouds, with a high near 73. Light and variable wind becoming east 5 to 10 mph in the morning. Chance of precipitation is 30%.

    High: 73 °F

    Patchy Fog
    then Chance
    Showers

  • Tonight

    Tonight: A chance of showers and thunderstorms. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 48. East wind 5 to 15 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 48 °F

    Chance
    Showers and
    Patchy Fog

  • Sunday

    Sunday: Showers, mainly before 5pm. Patchy fog before 7am. High near 68. West wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 68 °F

    Showers and
    Patchy Fog

  • Sunday Night

    Sunday Night: A chance of showers before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 39. Northwest wind around 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 39 °F

    Chance
    Showers then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 56. West wind 10 to 15 mph.

    High: 56 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A slight chance of showers. Partly cloudy, with a low around 38. Chance of precipitation is 20%.

    Low: 38 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 27.

    Low: 27 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

Detailed Forecast

Today
A chance of showers, mainly between 2pm and 3pm. Patchy fog before 8am. Otherwise, increasing clouds, with a high near 73. Light and variable wind becoming east 5 to 10 mph in the morning. Chance of precipitation is 30%.
Tonight
A chance of showers and thunderstorms. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 48. East wind 5 to 15 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers, mainly before 5pm. Patchy fog before 7am. High near 68. West wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
A chance of showers before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 39. Northwest wind around 10 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Mostly sunny, with a high near 56. West wind 10 to 15 mph.
Monday Night
A slight chance of showers. Partly cloudy, with a low around 38. Chance of precipitation is 20%.
Tuesday
Mostly sunny, with a high near 52.
Tuesday Night
Clear, with a low around 27.
Wednesday
Sunny, with a high near 52.
Wednesday Night
Mostly clear, with a low around 32.
Thursday
Mostly sunny, with a high near 64.
Thursday Night
Mostly clear, with a low around 42.
Friday
Sunny, with a high near 70.
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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:
4:10 am EDT Apr 4, 2026
Forecast Valid:
6am EDT Apr 4, 2026-6pm EDT Apr 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