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 100%
Wind Speed Calm
Barometer 29.62 in (1002.7 mb)
Dewpoint 33°F (1°C)
Visibility 0.25 mi
Last update 29 Dec 2:53 am EST
Extended Forecast for

Princeton Junction NJ

Wind Advisory December 29, 10:00am until December 30, 01:00pm
Dense Fog Advisory December 29, 03:37am until December 29, 10:00am
Click here for hazard details and duration
Wind Advisory
Dense Fog Advisory
  •  
    Dense Fog Advisory December 29, 03:37am until December 29, 10:00am

    NOW until 10:00am Mon

    Dense Fog Advisory

  • Overnight

    Low: 40 °F

    Patchy Fog

  • Monday

    Monday: Showers, mainly before 2pm. Patchy fog before 7am. High near 53. Breezy, with a southwest wind 10 to 15 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 45 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 53 °F

    Showers and
    Patchy Fog
    then Chance
    Showers and
    Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 25. Breezy, with a west wind around 20 mph, with gusts as high as 45 mph.

    Low: 25 °F

    Partly Cloudy
    and Breezy

  • Tuesday

    Tuesday: Partly sunny, with a high near 33. Breezy, with a west wind 15 to 20 mph, with gusts as high as 45 mph.

    High: 33 °F

    Partly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 23. West wind 5 to 15 mph.

    Low: 23 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 35.

    High: 35 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 21.

    Low: 21 °F

    Mostly Cloudy

  • New Year's Day

    New Year's Day: Partly sunny, with a high near 29.

    High: 29 °F

    Partly Sunny

Detailed Forecast

Overnight
Patchy fog before 4am. Otherwise, cloudy, with a steady temperature around 40. Southwest wind around 10 mph.
Monday
Showers, mainly before 2pm. Patchy fog before 7am. High near 53. Breezy, with a southwest wind 10 to 15 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 45 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday Night
Partly cloudy, with a low around 25. Breezy, with a west wind around 20 mph, with gusts as high as 45 mph.
Tuesday
Partly sunny, with a high near 33. Breezy, with a west wind 15 to 20 mph, with gusts as high as 45 mph.
Tuesday Night
Mostly cloudy, with a low around 23. West wind 5 to 15 mph.
Wednesday
Partly sunny, with a high near 35.
Wednesday Night
Mostly cloudy, with a low around 21.
New Year's Day
Partly sunny, with a high near 29.
Thursday Night
Partly cloudy, with a low around 16.
Friday
Mostly sunny, with a high near 30.
Friday Night
Partly cloudy, with a low around 16.
Saturday
Partly sunny, with a high near 34.
Saturday Night
Mostly cloudy, with a low around 20.
Sunday
Mostly sunny, with a high near 33.
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:
2:33 am EST Dec 29, 2025
Forecast Valid:
3am EST Dec 29, 2025-6pm EST Jan 4, 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