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

-2°C

28°F

Humidity 51%
Wind Speed S 7 km/h
Barometer 1017.2 mb (30.05 in)
Dewpoint -11°C (12°F)
Visibility 16 km
Wind Chill-6°C (22°F)
Last update 16 Jan 7:53 pm EST
Extended Forecast for

Princeton Junction NJ

  • Tonight

    Tonight: A chance of snow, mainly after 3am. Increasing clouds, with a low around -3. South wind 5 to 10 km/h. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: -3 °C

    Partly Cloudy
    then Chance
    Snow

  • Saturday

    Saturday: Snow likely, possibly mixed with rain, mainly before 2pm. Mostly cloudy, with a high near 4. Southwest wind 10 to 15 km/h. Chance of precipitation is 70%. New snow accumulation of less than a half centimeter possible.

    High: 4 °C

    Snow Likely
    then
    Rain/Snow
    Likely

  • Saturday Night

    Saturday Night: A chance of snow after 1am. Increasing clouds, with a low around -2. Calm wind. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: -2 °C

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: Snow likely, mainly between 10am and 1pm. Cloudy, with a high near 2. West wind 5 to 10 km/h. Chance of precipitation is 60%. New snow accumulation of 1 to 3 centimeters possible.

    High: 2 °C

    Snow Likely

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around -8. West wind around 10 km/h.

    Low: -8 °C

    Partly Cloudy

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 1.

    High: 1 °C

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around -12.

    Low: -12 °C

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near -6.

    High: -6 °C

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around -14.

    Low: -14 °C

    Mostly Clear

Detailed Forecast

Tonight
A chance of snow, mainly after 3am. Increasing clouds, with a low around -3. South wind 5 to 10 km/h. Chance of precipitation is 30%. Little or no snow accumulation expected.
Saturday
Snow likely, possibly mixed with rain, mainly before 2pm. Mostly cloudy, with a high near 4. Southwest wind 10 to 15 km/h. Chance of precipitation is 70%. New snow accumulation of less than a half centimeter possible.
Saturday Night
A chance of snow after 1am. Increasing clouds, with a low around -2. Calm wind. Chance of precipitation is 30%. Little or no snow accumulation expected.
Sunday
Snow likely, mainly between 10am and 1pm. Cloudy, with a high near 2. West wind 5 to 10 km/h. Chance of precipitation is 60%. New snow accumulation of 1 to 3 centimeters possible.
Sunday Night
Partly cloudy, with a low around -8. West wind around 10 km/h.
M.L.King Day
Sunny, with a high near 1.
Monday Night
Mostly clear, with a low around -12.
Tuesday
Sunny, with a high near -6.
Tuesday Night
Mostly clear, with a low around -14.
Wednesday
Mostly sunny, with a high near 0.
Wednesday Night
Mostly cloudy, with a low around -5.
Thursday
Mostly cloudy, with a high near 4.
Thursday Night
Mostly cloudy, with a low around -7.
Friday
A chance of snow. Partly sunny, with a high near 0. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.3°N 74.62°W (Elev. 98 m)
Last Update:
4:12 pm EST Jan 16, 2026
Forecast Valid:
8pm EST Jan 16, 2026-6pm EST Jan 23, 2026
 
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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