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

54°F

12°C

Humidity 35%
Wind Speed SW 5 mph
Barometer 29.90 in (1011.9 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 3 May 8:53 pm EDT
Extended Forecast for

Princeton Junction NJ

  • Tonight

    Tonight: Mostly clear, with a low around 44. Southwest wind around 5 mph.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 74. Southwest wind 10 to 15 mph.

    High: 74 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 55. South wind 5 to 10 mph.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers after 2am. Mostly cloudy, with a low around 61. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 61 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely, then showers and possibly a thunderstorm after 2pm. High near 70. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 70 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers, mainly before 2am. Low around 47. Chance of precipitation is 80%.

    Low: 47 °F

    Showers

  • Thursday

    Thursday: Showers likely, mainly after 8am. Mostly cloudy, with a high near 60. Chance of precipitation is 70%.

    High: 60 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers before 2am. Partly cloudy, with a low around 39. Chance of precipitation is 30%.

    Low: 39 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 44. Southwest wind around 5 mph.
Monday
Sunny, with a high near 74. Southwest wind 10 to 15 mph.
Monday Night
Mostly clear, with a low around 55. South wind 5 to 10 mph.
Tuesday
Sunny, with a high near 84. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.
Tuesday Night
A slight chance of showers after 2am. Mostly cloudy, with a low around 61. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Wednesday
Showers likely, then showers and possibly a thunderstorm after 2pm. High near 70. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Showers, mainly before 2am. Low around 47. Chance of precipitation is 80%.
Thursday
Showers likely, mainly after 8am. Mostly cloudy, with a high near 60. Chance of precipitation is 70%.
Thursday Night
A chance of showers before 2am. Partly cloudy, with a low around 39. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 63.
Friday Night
Partly cloudy, with a low around 46.
Saturday
A chance of showers. Partly sunny, with a high near 64. Chance of precipitation is 40%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 45. Chance of precipitation is 30%.
Sunday
Mostly sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.32°N 74.62°W (Elev. 85 ft)
Last Update:
8:56 pm EDT May 3, 2026
Forecast Valid:
9pm EDT May 3, 2026-6pm EDT May 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