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

35°F

2°C

Humidity 64%
Wind Speed NW 17 G 31 mph
Barometer 29.68 in (1004.7 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 23 Feb 4:53 pm EST
Extended Forecast for

Princeton Junction NJ

  • This Afternoon

    This Afternoon: A slight chance of rain before 5pm, then a slight chance of rain and snow. Cloudy, with a high near 35. Northwest wind around 15 mph. Chance of precipitation is 20%.

    High: 35 °F

    Slight Chance
    Rain/Snow

  • Tonight

    Tonight: Cloudy, then gradually becoming partly cloudy, with a low around 19. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 19 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 29. West wind around 10 mph, with gusts as high as 20 mph.

    High: 29 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Snow likely after 1am. Increasing clouds, with a low around 17. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 17 °F

    Partly Cloudy
    then Snow
    Likely

  • Wednesday

    Wednesday: A chance of snow before 10am, then a chance of rain between 10am and 1pm. Partly sunny, with a high near 44. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

    High: 44 °F

    Chance
    Rain/Snow
    then Chance
    Rain

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Thursday

    Thursday: Rain and snow likely after 1pm. Mostly cloudy, with a high near 41. Chance of precipitation is 60%.

    High: 41 °F

    Partly Sunny
    then
    Rain/Snow
    Likely

  • Thursday Night

    Thursday Night: Rain and snow likely, mainly before 1am. Mostly cloudy, with a low around 28. Chance of precipitation is 70%.

    Low: 28 °F

    Rain/Snow
    Likely

  • Friday

    Friday: Mostly sunny, with a high near 43.

    High: 43 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A slight chance of rain before 5pm, then a slight chance of rain and snow. Cloudy, with a high near 35. Northwest wind around 15 mph. Chance of precipitation is 20%.
Tonight
Cloudy, then gradually becoming partly cloudy, with a low around 19. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 29. West wind around 10 mph, with gusts as high as 20 mph.
Tuesday Night
Snow likely after 1am. Increasing clouds, with a low around 17. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Wednesday
A chance of snow before 10am, then a chance of rain between 10am and 1pm. Partly sunny, with a high near 44. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.
Wednesday Night
Partly cloudy, with a low around 28.
Thursday
Rain and snow likely after 1pm. Mostly cloudy, with a high near 41. Chance of precipitation is 60%.
Thursday Night
Rain and snow likely, mainly before 1am. Mostly cloudy, with a low around 28. Chance of precipitation is 70%.
Friday
Mostly sunny, with a high near 43.
Friday Night
Mostly clear, with a low around 24.
Saturday
Sunny, with a high near 48.
Saturday Night
Mostly clear, with a low around 30.
Sunday
Partly sunny, with a high near 45.
Sunday Night
Mostly cloudy, with a low around 23.
Monday
A chance of rain and snow. Mostly cloudy, with a high near 34.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.32°N 74.62°W (Elev. 85 ft)
Last Update:
4:16 pm EST Feb 23, 2026
Forecast Valid:
4pm EST Feb 23, 2026-6pm EST Mar 2, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation