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.

Light Rain

49°F

9°C

Humidity 90%
Wind Speed E 18 G 29 mph
Barometer 30.24 in (1023.4 mb)
Dewpoint 46°F (8°C)
Visibility 9.00 mi
Wind Chill43°F (6°C)
Last update 2 Apr 2:53 am EDT
Extended Forecast for

Princeton Junction NJ

  • Overnight

    Overnight: A chance of showers before 5am. Cloudy, with a low around 46. East wind around 15 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 46 °F

    Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers between 8am and 2pm. Cloudy, with a high near 50. East wind around 15 mph. Chance of precipitation is 20%.

    High: 50 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: A slight chance of showers between 8pm and 2am. Cloudy, with a low around 42. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 42 °F

    Slight Chance
    Showers

  • Friday

    Friday: Cloudy, then gradually becoming mostly sunny, with a high near 77. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 77 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 59. South wind 5 to 10 mph.

    Low: 59 °F

    Mostly Cloudy

  • Saturday

    Saturday: A slight chance of showers after 2pm. Mostly sunny, with a high near 82. Chance of precipitation is 20%.

    High: 82 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers after 2am. Partly cloudy, with a low around 57. Chance of precipitation is 30%.

    Low: 57 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers, mainly after 8am. High near 71. Chance of precipitation is 90%.

    High: 71 °F

    Showers

  • Sunday Night

    Sunday Night: Showers, mainly before 8pm. Low around 40. Chance of precipitation is 80%.

    Low: 40 °F

    Showers then
    Chance
    Showers

Detailed Forecast

Overnight
A chance of showers before 5am. Cloudy, with a low around 46. East wind around 15 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
A slight chance of showers between 8am and 2pm. Cloudy, with a high near 50. East wind around 15 mph. Chance of precipitation is 20%.
Thursday Night
A slight chance of showers between 8pm and 2am. Cloudy, with a low around 42. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Friday
Cloudy, then gradually becoming mostly sunny, with a high near 77. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Mostly cloudy, with a low around 59. South wind 5 to 10 mph.
Saturday
A slight chance of showers after 2pm. Mostly sunny, with a high near 82. Chance of precipitation is 20%.
Saturday Night
A chance of showers after 2am. Partly cloudy, with a low around 57. Chance of precipitation is 30%.
Sunday
Showers, mainly after 8am. High near 71. Chance of precipitation is 90%.
Sunday Night
Showers, mainly before 8pm. Low around 40. Chance of precipitation is 80%.
Monday
Mostly sunny, with a high near 56.
Monday Night
Partly cloudy, with a low around 36.
Tuesday
Mostly sunny, with a high near 54.
Tuesday Night
Partly cloudy, with a low around 31.
Wednesday
Sunny, with a high near 52.
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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:
8:19 pm EDT Apr 1, 2026
Forecast Valid:
3am EDT Apr 2, 2026-6pm EDT Apr 8, 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