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.

Overcast

61°F

16°C

Humidity 46%
Wind Speed S 20 G 33 mph
Barometer 29.78 in (1007.8 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 20 Mar 5:53 pm EDT
Extended Forecast for

Princeton Junction NJ

  • Tonight

    Tonight: Showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Low around 47. Southwest wind 5 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 47 °F

    Showers then
    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 59. North wind 5 to 10 mph.

    High: 59 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 40. Calm wind.

    Low: 40 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 70. Southwest wind 5 to 10 mph.

    High: 70 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 46. Southwest wind around 5 mph becoming northwest after midnight. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 46 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers before 2pm. Partly sunny, with a high near 49. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 49 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 49.

    High: 49 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Low around 47. Southwest wind 5 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Mostly sunny, with a high near 59. North wind 5 to 10 mph.
Saturday Night
Mostly cloudy, with a low around 40. Calm wind.
Sunday
Partly sunny, with a high near 70. Southwest wind 5 to 10 mph.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 46. Southwest wind around 5 mph becoming northwest after midnight. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Monday
A chance of showers before 2pm. Partly sunny, with a high near 49. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Mostly clear, with a low around 30.
Tuesday
Sunny, with a high near 49.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
Partly sunny, with a high near 51.
Wednesday Night
Partly cloudy, with a low around 32.
Thursday
Mostly sunny, with a high near 56.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 39. Chance of precipitation is 50%.
Friday
A chance of rain. Mostly cloudy, with a high near 54. Chance of precipitation is 30%.
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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 EDT Mar 20, 2026
Forecast Valid:
6pm EDT Mar 20, 2026-6pm EDT Mar 27, 2026
 
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Additional Resources

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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