National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Trenton-Mercer Airport (KTTN)

Lat: 40.28°NLon: 74.82°WElev: 210ft.

Fog

33°F

1°C

Humidity 96%
Wind Speed Calm
Barometer 30.11 in (1019.0 mb)
Dewpoint 32°F (0°C)
Visibility 0.50 mi
Last update 20 Apr 5:53 am EDT
Extended Forecast for

Princeton Junction NJ

Freeze Warning April 21, 12:00am until April 21, 09:00am
Click here for hazard details and duration
Freeze Warning

  • Today

    Today: A slight chance of showers between noon and 2pm. Patchy frost before 7am. Otherwise, partly sunny, with a high near 51. Light and variable wind becoming northwest 5 to 10 mph in the morning. Chance of precipitation is 20%.

    High: 51 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Mostly clear, with a low around 29. North wind around 5 mph.

    Low: 29 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 55. Calm wind becoming west around 5 mph.

    High: 55 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers after 2am. Increasing clouds, with a low around 42. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 42 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers before 2pm. Partly sunny, with a high near 66. South wind around 5 mph becoming northwest in the afternoon. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 66 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 69.

    High: 69 °F

    Partly Sunny

Detailed Forecast

Today
A slight chance of showers between noon and 2pm. Patchy frost before 7am. Otherwise, partly sunny, with a high near 51. Light and variable wind becoming northwest 5 to 10 mph in the morning. Chance of precipitation is 20%.
Tonight
Mostly clear, with a low around 29. North wind around 5 mph.
Tuesday
Sunny, with a high near 55. Calm wind becoming west around 5 mph.
Tuesday Night
A chance of showers after 2am. Increasing clouds, with a low around 42. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
A chance of showers before 2pm. Partly sunny, with a high near 66. South wind around 5 mph becoming northwest in the afternoon. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Partly cloudy, with a low around 44.
Thursday
Mostly sunny, with a high near 71.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Partly sunny, with a high near 69.
Friday Night
A chance of showers. Mostly cloudy, with a low around 48. Chance of precipitation is 30%.
Saturday
A chance of showers. Mostly cloudy, with a high near 61. Chance of precipitation is 40%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 46. Chance of precipitation is 50%.
Sunday
A chance of showers. Mostly cloudy, with a high near 62. Chance of precipitation is 40%.
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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:
4:10 am EDT Apr 20, 2026
Forecast Valid:
6am EDT Apr 20, 2026-6pm EDT Apr 26, 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