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

69°F

21°C

Humidity 39%
Wind Speed SW 12 G 23 mph
Barometer 29.90 in (1011.9 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 26 Mar 12:53 pm EDT
Extended Forecast for

Princeton Junction NJ

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 75. Southwest wind 10 to 15 mph.

    High: 75 °F

    Mostly Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 52. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 52 °F

    Chance
    Showers then
    Showers

  • Friday

    Friday: Periods of rain, mainly before 9am. Temperature falling to around 50 by noon. North wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 54 °F⇓

    Rain then
    Chance Rain

  • Friday Night

    Friday Night: A slight chance of rain before 2am. Mostly cloudy, with a low around 29. North wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 29 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: Sunny, with a high near 44. Northwest wind 10 to 15 mph.

    High: 44 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 26.

    Low: 26 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 62.

    High: 62 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 75. Southwest wind 10 to 15 mph.
Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 52. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
Periods of rain, mainly before 9am. Temperature falling to around 50 by noon. North wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
A slight chance of rain before 2am. Mostly cloudy, with a low around 29. North wind 5 to 10 mph. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 44. Northwest wind 10 to 15 mph.
Saturday Night
Mostly clear, with a low around 26.
Sunday
Mostly sunny, with a high near 54.
Sunday Night
Partly cloudy, with a low around 38.
Monday
Mostly cloudy, with a high near 62.
Monday Night
A chance of rain. Mostly cloudy, with a low around 47. Chance of precipitation is 30%.
Tuesday
A chance of rain. Mostly cloudy, with a high near 63. Chance of precipitation is 40%.
Tuesday Night
A chance of rain. Mostly cloudy, with a low around 45. Chance of precipitation is 50%.
Wednesday
A chance of rain. Partly sunny, with a high near 63. Chance of precipitation is 30%.
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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:
12:06 pm EDT Mar 26, 2026
Forecast Valid:
1pm EDT Mar 26, 2026-6pm EDT Apr 1, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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