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

41°F

5°C

Humidity 49%
Wind Speed SW 5 mph
Barometer 30.35 in (1027.3 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 24 Mar 9:53 pm EDT
Extended Forecast for

Princeton Junction NJ

  • Tonight

    Tonight: Cloudy, then becoming partly cloudy toward daybreak, with a low around 33. Calm wind.

    Low: 33 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 56. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 56 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Cloudy, with a low around 42. South wind around 5 mph.

    Low: 42 °F

    Cloudy

  • Thursday

    Thursday: Cloudy, then gradually becoming mostly sunny, with a high near 70. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 70 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Rain, mainly after 2am. Low around 51. Southwest wind around 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 51 °F

    Chance Rain
    then Rain

  • Friday

    Friday: Rain, mainly before 8am. High near 61. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 61 °F

    Rain then
    Chance Rain

  • 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

Detailed Forecast

Tonight
Cloudy, then becoming partly cloudy toward daybreak, with a low around 33. Calm wind.
Wednesday
Partly sunny, with a high near 56. Calm wind becoming southwest around 5 mph in the afternoon.
Wednesday Night
Cloudy, with a low around 42. South wind around 5 mph.
Thursday
Cloudy, then gradually becoming mostly sunny, with a high near 70. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Rain, mainly after 2am. Low around 51. Southwest wind around 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain, mainly before 8am. High near 61. 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
Sunny, with a high near 53.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Partly sunny, with a high near 61.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
Partly sunny, with a high near 62.
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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 24, 2026
Forecast Valid:
10pm EDT Mar 24, 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