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.

Partly Cloudy

31°F

-1°C

Humidity 59%
Wind Speed SE 6 mph
Barometer 30.02 in (1016.1 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 17 Jan 5:53 am EST
Extended Forecast for

Princeton Junction NJ

  • Today

    Today: Rain and snow, mainly before 3pm. High near 39. Southwest wind 5 to 10 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    High: 39 °F

    Chance Snow
    then
    Rain/Snow

  • Tonight

    Tonight: A chance of snow, mainly after 4am. Mostly cloudy, with a low around 28. Southwest wind around 5 mph becoming calm. Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 28 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: Snow likely, mainly after 7am. Cloudy, with a high near 35. Calm wind becoming west around 5 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.

    High: 35 °F

    Snow Likely

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 19. West wind around 5 mph.

    Low: 19 °F

    Partly Cloudy

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 34. Southwest wind 5 to 15 mph.

    High: 34 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 12.

    Low: 12 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 22.

    High: 22 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 10.

    Low: 10 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

Detailed Forecast

Today
Rain and snow, mainly before 3pm. High near 39. Southwest wind 5 to 10 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Tonight
A chance of snow, mainly after 4am. Mostly cloudy, with a low around 28. Southwest wind around 5 mph becoming calm. Chance of precipitation is 30%. Little or no snow accumulation expected.
Sunday
Snow likely, mainly after 7am. Cloudy, with a high near 35. Calm wind becoming west around 5 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.
Sunday Night
Partly cloudy, with a low around 19. West wind around 5 mph.
M.L.King Day
Sunny, with a high near 34. Southwest wind 5 to 15 mph.
Monday Night
Partly cloudy, with a low around 12.
Tuesday
Sunny, with a high near 22.
Tuesday Night
Mostly clear, with a low around 10.
Wednesday
Mostly sunny, with a high near 34.
Wednesday Night
Mostly cloudy, with a low around 26.
Thursday
Partly sunny, with a high near 39.
Thursday Night
Mostly cloudy, with a low around 21.
Friday
Mostly sunny, with a high near 33.
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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:
4:11 am EST Jan 17, 2026
Forecast Valid:
6am EST Jan 17, 2026-6pm EST Jan 23, 2026
 
Forecast Discussion
 
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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