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

42°F

6°C

Humidity 51%
Wind Speed NW 15 G 30 mph
Barometer 30.10 in (1018.7 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 24 Dec 8:53 am EST
Extended Forecast for

3 Miles S Princeton Junction NJ

  • Today

    Today: Sunny, with a high near 43. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 43 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 25. Calm wind.

    Low: 25 °F

    Increasing
    Clouds

  • Christmas Day

    Christmas Day: A slight chance of rain and snow before 10am, then a slight chance of rain between 10am and 1pm. Mostly cloudy, with a high near 44. South wind 5 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 20%.

    High: 44 °F

    Slight Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 20. North wind around 5 mph.

    Low: 20 °F

    Mostly Cloudy

  • Friday

    Friday: Snow likely after 1pm. Mostly cloudy, with a high near 32. North wind around 5 mph becoming east in the afternoon. Chance of precipitation is 60%. New snow accumulation of around an inch possible.

    High: 32 °F

    Mostly Cloudy
    then Snow
    Likely

  • Friday Night

    Friday Night: Snow. Low around 24. Chance of precipitation is 100%.

    Low: 24 °F

    Snow

  • Saturday

    Saturday: Snow likely before 1pm, then a chance of rain and snow. Cloudy, with a high near 36. Chance of precipitation is 60%.

    High: 36 °F

    Snow Likely
    then
    Rain/Snow
    Likely

  • Saturday Night

    Saturday Night: Cloudy, with a low around 27.

    Low: 27 °F

    Cloudy

  • Sunday

    Sunday: Rain likely, mainly after 1pm. Cloudy, with a high near 42. Chance of precipitation is 70%.

    High: 42 °F

    Chance Rain
    then Rain
    Likely

Detailed Forecast

Today
Sunny, with a high near 43. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Tonight
Increasing clouds, with a low around 25. Calm wind.
Christmas Day
A slight chance of rain and snow before 10am, then a slight chance of rain between 10am and 1pm. Mostly cloudy, with a high near 44. South wind 5 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 20%.
Thursday Night
Mostly cloudy, with a low around 20. North wind around 5 mph.
Friday
Snow likely after 1pm. Mostly cloudy, with a high near 32. North wind around 5 mph becoming east in the afternoon. Chance of precipitation is 60%. New snow accumulation of around an inch possible.
Friday Night
Snow. Low around 24. Chance of precipitation is 100%.
Saturday
Snow likely before 1pm, then a chance of rain and snow. Cloudy, with a high near 36. Chance of precipitation is 60%.
Saturday Night
Cloudy, with a low around 27.
Sunday
Rain likely, mainly after 1pm. Cloudy, with a high near 42. Chance of precipitation is 70%.
Sunday Night
Rain likely, mainly before 1am. Cloudy, with a low around 28. Chance of precipitation is 70%.
Monday
A chance of rain. Partly sunny, with a high near 38. Chance of precipitation is 30%.
Monday Night
Partly cloudy, with a low around 18.
Tuesday
Mostly sunny, with a high near 30.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Princeton Junction NJ
 40.28°N 74.63°W (Elev. 98 ft)
Last Update:
4:14 am EST Dec 24, 2025
Forecast Valid:
9am EST Dec 24, 2025-6pm EST Dec 30, 2025
 
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Additional Resources

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National Digital Forecast Database Weather Element Forecast

Chance of Precipitation