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

32°F

0°C

Humidity 75%
Wind Speed S 3 mph
Barometer 30.10 in (1018.9 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 13 Jan 8:53 am EST
Extended Forecast for

3 Miles SSW Princeton Junction NJ

  • Today

    Today: Increasing clouds, with a high near 48. Southwest wind 5 to 10 mph.

    High: 48 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A slight chance of rain after 1am. Mostly cloudy, with a low around 36. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 36 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: A chance of rain after 1pm. Mostly cloudy, with a high near 50. Southwest wind around 5 mph. Chance of precipitation is 30%.

    High: 50 °F

    Mostly Cloudy
    then Chance
    Rain

  • Wednesday Night

    Wednesday Night: A chance of rain before 1am, then rain and snow likely. Cloudy, with a low around 28. South wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

    Low: 28 °F

    Chance Rain
    then
    Rain/Snow
    Likely

  • Thursday

    Thursday: A slight chance of snow before 10am, then a slight chance of rain between 10am and 1pm. Partly sunny, with a high near 34. West wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

    High: 34 °F

    Slight Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 15.

    Low: 15 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 48. Southwest wind 5 to 10 mph.
Tonight
A slight chance of rain after 1am. Mostly cloudy, with a low around 36. Southwest wind 5 to 10 mph. Chance of precipitation is 20%.
Wednesday
A chance of rain after 1pm. Mostly cloudy, with a high near 50. Southwest wind around 5 mph. Chance of precipitation is 30%.
Wednesday Night
A chance of rain before 1am, then rain and snow likely. Cloudy, with a low around 28. South wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Thursday
A slight chance of snow before 10am, then a slight chance of rain between 10am and 1pm. Partly sunny, with a high near 34. West wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 15.
Friday
Mostly sunny, with a high near 32.
Friday Night
Partly cloudy, with a low around 24.
Saturday
Partly sunny, with a high near 42.
Saturday Night
Mostly cloudy, with a low around 24.
Sunday
Mostly sunny, with a high near 35.
Sunday Night
Partly cloudy, with a low around 19.
M.L.King Day
Mostly sunny, with a high near 31.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Princeton Junction NJ
 40.28°N 74.63°W (Elev. 98 ft)
Last Update:
4:10 am EST Jan 13, 2026
Forecast Valid:
9am EST Jan 13, 2026-6pm EST Jan 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation