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

48°F

9°C

Humidity 58%
Wind Speed SW 9 mph
Barometer 30.39 in (1028.5 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 25 Mar 11:53 am EDT
Extended Forecast for

Princeton Junction NJ

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 57. Southwest wind around 5 mph.

    High: 57 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 41. South wind around 5 mph.

    Low: 41 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Cloudy, then gradually becoming mostly sunny, with a high near 71. Southwest wind 10 to 15 mph.

    High: 71 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Showers, mainly after 2am. Low around 53. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 53 °F

    Chance
    Showers then
    Showers

  • Friday

    Friday: Showers, mainly before 8am. High near 54. 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

    Showers then
    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 46.

    High: 46 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29.

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 57. Southwest wind around 5 mph.
Tonight
Increasing clouds, with a low around 41. South wind around 5 mph.
Thursday
Cloudy, then gradually becoming mostly sunny, with a high near 71. Southwest wind 10 to 15 mph.
Thursday Night
Showers, mainly after 2am. Low around 53. Southwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Showers, mainly before 8am. High near 54. 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
Partly cloudy, with a low around 28.
Saturday
Sunny, with a high near 46.
Saturday Night
Partly cloudy, with a low around 29.
Sunday
Mostly sunny, with a high near 53.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Partly sunny, with a high near 60.
Monday Night
Mostly cloudy, with a low around 45.
Tuesday
Partly sunny, with a high near 65.
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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:
4:09 am EDT Mar 25, 2026
Forecast Valid:
12pm EDT Mar 25, 2026-6pm EDT Mar 31, 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