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

13°C

55°F

Humidity 93%
Wind Speed NE 20 km/h
Barometer 1007.3 mb (29.77 in)
Dewpoint 12°C (53°F)
Visibility 16 km
Wind Chill11°C (51°F)
Last update 12 Oct 1:53 am EDT
Extended Forecast for

Princeton NJ

  • Overnight

    Overnight: Showers likely, mainly before 5am. Cloudy, with a low around 13. Northeast wind 10 to 15 km/h. Chance of precipitation is 70%. New precipitation amounts between 2.5 and 5 mm possible.

    Low: 13 °C

    Showers
    Likely

  • Columbus Day

    Columbus Day: A chance of showers, mainly before 7am. Patchy fog between 10am and 1pm. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 23. North wind around 10 km/h. Chance of precipitation is 30%. New precipitation amounts between 1 and 2.5 mm possible.

    High: 23 °C

    Chance
    Showers and
    Patchy Fog
    then Patchy
    Fog

  • Monday Night

    Monday Night: Partly cloudy, with a low around 13. Calm wind.

    Low: 13 °C

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 24. Calm wind becoming south 5 to 10 km/h in the afternoon.

    High: 24 °C

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 17. Southwest wind around 10 km/h.

    Low: 17 °C

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 26.

    High: 26 °C

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 13.

    Low: 13 °C

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 19.

    High: 19 °C

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers after 2am. Partly cloudy, with a low around 11. Chance of precipitation is 40%.

    Low: 11 °C

    Partly Cloudy
    then Chance
    Showers

Detailed Forecast

Overnight
Showers likely, mainly before 5am. Cloudy, with a low around 13. Northeast wind 10 to 15 km/h. Chance of precipitation is 70%. New precipitation amounts between 2.5 and 5 mm possible.
Columbus Day
A chance of showers, mainly before 7am. Patchy fog between 10am and 1pm. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 23. North wind around 10 km/h. Chance of precipitation is 30%. New precipitation amounts between 1 and 2.5 mm possible.
Monday Night
Partly cloudy, with a low around 13. Calm wind.
Tuesday
Mostly cloudy, then gradually becoming sunny, with a high near 24. Calm wind becoming south 5 to 10 km/h in the afternoon.
Tuesday Night
Mostly clear, with a low around 17. Southwest wind around 10 km/h.
Wednesday
Sunny, with a high near 26.
Wednesday Night
Mostly cloudy, with a low around 13.
Thursday
Mostly sunny, with a high near 19.
Thursday Night
A chance of showers after 2am. Partly cloudy, with a low around 11. Chance of precipitation is 40%.
Friday
Showers likely, mainly after 8am. Mostly cloudy, with a high near 20. Chance of precipitation is 60%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 8. Chance of precipitation is 30%.
Saturday
Partly sunny, with a high near 13.
Saturday Night
Partly cloudy, with a low around 2.
Sunday
Sunny, with a high near 12.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJ
 40.37°N 74.67°W (Elev. 256 m)
Last Update:
9:22 pm EDT Oct 11, 2026
Forecast Valid:
2am EDT Oct 12, 2026-6pm EDT Oct 18, 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