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

19°F

-7°C

Humidity 36%
Wind Speed W 17 G 29 mph
Barometer 30.34 in (1027.0 mb)
Dewpoint -4°F (-20°C)
Visibility 10.00 mi
Wind Chill4°F (-16°C)
Last update 20 Jan 1:53 pm EST
Extended Forecast for

Princeton Junction NJ

  • This Afternoon

    This Afternoon: Sunny, with a high near 22. West wind around 15 mph.

    High: 22 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 4. West wind around 5 mph becoming calm in the evening.

    Low: 4 °F

    Mostly Clear

  • Wednesday

    Wednesday: Increasing clouds, with a high near 34. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 34 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Cloudy, then gradually becoming partly cloudy, with a low around 27. Southwest wind 5 to 10 mph.

    Low: 27 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Mostly sunny, with a high near 44. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 44 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 23.

    Low: 23 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 32.

    High: 32 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 8.

    Low: 8 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 18.

    High: 18 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 22. West wind around 15 mph.
Tonight
Mostly clear, with a low around 4. West wind around 5 mph becoming calm in the evening.
Wednesday
Increasing clouds, with a high near 34. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Wednesday Night
Cloudy, then gradually becoming partly cloudy, with a low around 27. Southwest wind 5 to 10 mph.
Thursday
Mostly sunny, with a high near 44. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 23.
Friday
Partly sunny, with a high near 32.
Friday Night
Partly cloudy, with a low around 8.
Saturday
Partly sunny, with a high near 18.
Saturday Night
Snow likely, mainly after 1am. Cloudy, with a low around 10. Chance of precipitation is 60%.
Sunday
Snow likely. Cloudy, with a high near 20. Chance of precipitation is 70%.
Sunday Night
A chance of snow. Mostly cloudy, with a low around 8. Chance of precipitation is 50%.
Monday
A chance of snow. Partly sunny, with a high near 24. Chance of precipitation is 30%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.32°N 74.62°W (Elev. 85 ft)
Last Update:
1:52 pm EST Jan 20, 2026
Forecast Valid:
2pm EST Jan 20, 2026-6pm EST Jan 26, 2026
 
Forecast Discussion
 
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Additional Resources

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Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation