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

37°F

3°C

Humidity 89%
Wind Speed Vrbl 5 mph
Barometer 29.96 in (1014.0 mb)
Dewpoint 34°F (1°C)
Visibility 8.00 mi
Wind Chill33°F (1°C)
Last update 23 Dec 11:53 pm EST
Extended Forecast for

Princeton NJSimilar City Names

  • Overnight

    Overnight: Partly cloudy, with a low around 33. West wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 33 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 44. Northwest wind 5 to 15 mph, with gusts as high as 30 mph.

    High: 44 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 26. Calm wind.

    Low: 26 °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 43. Southwest wind around 5 mph becoming northwest in the afternoon. Chance of precipitation is 20%.

    High: 43 °F

    Slight Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 22. Northwest wind around 5 mph.

    Low: 22 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of snow after 1pm. Mostly cloudy, with a high near 32. Chance of precipitation is 50%.

    High: 32 °F

    Mostly Cloudy
    then Chance
    Snow

  • Friday Night

    Friday Night: Snow before 1am, then snow and freezing rain. Low around 27. Chance of precipitation is 100%.

    Low: 27 °F

    Snow then
    Wintry Mix

  • Saturday

    Saturday: A chance of snow before 1pm, then a chance of rain and snow. Cloudy, with a high near 36. Chance of precipitation is 50%.

    High: 36 °F

    Chance Snow
    then Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: A chance of snow. Cloudy, with a low around 30. Chance of precipitation is 40%.

    Low: 30 °F

    Chance Snow

Detailed Forecast

Overnight
Partly cloudy, with a low around 33. West wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 44. Northwest wind 5 to 15 mph, with gusts as high as 30 mph.
Wednesday Night
Increasing clouds, with a low around 26. 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 43. Southwest wind around 5 mph becoming northwest in the afternoon. Chance of precipitation is 20%.
Thursday Night
Mostly cloudy, with a low around 22. Northwest wind around 5 mph.
Friday
A chance of snow after 1pm. Mostly cloudy, with a high near 32. Chance of precipitation is 50%.
Friday Night
Snow before 1am, then snow and freezing rain. Low around 27. Chance of precipitation is 100%.
Saturday
A chance of snow before 1pm, then a chance of rain and snow. Cloudy, with a high near 36. Chance of precipitation is 50%.
Saturday Night
A chance of snow. Cloudy, with a low around 30. Chance of precipitation is 40%.
Sunday
Rain. High near 43. Chance of precipitation is 80%.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 26. Chance of precipitation is 50%.
Monday
Partly sunny, with a high near 34.
Monday Night
Mostly clear, with a low around 18.
Tuesday
Mostly sunny, with a high near 30.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton NJSimilar City Names
 40.35°N 74.67°W (Elev. 190 ft)
Last Update:
4:12 pm EST Dec 23, 2025
Forecast Valid:
12am EST Dec 24, 2025-6pm EST Dec 30, 2025
 
Forecast Discussion
 
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Additional Resources

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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