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.

Light Rain

43°F

6°C

Humidity 89%
Wind Speed N 7 mph
Barometer 29.94 in (1013.4 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 19 Apr 2:53 pm EDT
Extended Forecast for

Princeton Junction NJ

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

  • This Afternoon

    This Afternoon: A slight chance of showers. Mostly cloudy, with a steady temperature around 48. Northwest wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    High: 48 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Mostly clear, with a low around 38. Northwest wind around 5 mph becoming calm in the evening.

    Low: 38 °F

    Mostly Clear

  • Monday

    Monday: A slight chance of showers before 2pm. Partly sunny, with a high near 52. Northwest wind 5 to 15 mph. Chance of precipitation is 20%.

    High: 52 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 28. North wind 5 to 10 mph.

    Low: 28 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 55. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 55 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers after 2am. Mostly cloudy, with a low around 40. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 40 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers before 8am. Partly sunny, with a high near 66. Chance of precipitation is 30%.

    High: 66 °F

    Chance
    Showers then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

Detailed Forecast

This Afternoon
A slight chance of showers. Mostly cloudy, with a steady temperature around 48. Northwest wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Tonight
Mostly clear, with a low around 38. Northwest wind around 5 mph becoming calm in the evening.
Monday
A slight chance of showers before 2pm. Partly sunny, with a high near 52. Northwest wind 5 to 15 mph. Chance of precipitation is 20%.
Monday Night
Mostly clear, with a low around 28. North wind 5 to 10 mph.
Tuesday
Sunny, with a high near 55. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
A chance of showers after 2am. Mostly cloudy, with a low around 40. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday
A chance of showers before 8am. Partly sunny, with a high near 66. Chance of precipitation is 30%.
Wednesday Night
Partly cloudy, with a low around 43.
Thursday
Sunny, with a high near 73.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Mostly sunny, with a high near 73.
Friday Night
Partly cloudy, with a low around 48.
Saturday
A chance of showers. Partly sunny, with a high near 70. Chance of precipitation is 30%.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 48. Chance of precipitation is 50%.
Sunday
A chance of showers. Mostly cloudy, with a high near 64.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.32°N 74.62°W (Elev. 85 ft)
Last Update:
6:03 am EDT Apr 19, 2026
Forecast Valid:
3pm EDT Apr 19, 2026-6pm EDT Apr 26, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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