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

56°F

13°C

Humidity 97%
Wind Speed N 14 G 20 mph
Barometer 29.82 in (1009.1 mb)
Dewpoint 55°F (13°C)
Visibility 9.00 mi
Last update 11 Oct 11:53 pm EDT
Extended Forecast for

Princeton Junction NJ

  • Overnight

    Overnight: Showers likely. Cloudy, with a low around 57. Northeast wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 57 °F

    Showers
    Likely

  • Columbus Day

    Columbus Day: A chance of showers before 8am. Patchy fog between 10am and 1pm. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 74. North wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 74 °F

    Chance
    Showers and
    Patchy Fog
    then Patchy
    Fog

  • Monday Night

    Monday Night: Partly cloudy, with a low around 54. Calm wind.

    Low: 54 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 76. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 76 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 62. Southwest wind around 5 mph.

    Low: 62 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers after 2am. Partly cloudy, with a low around 51. Chance of precipitation is 40%.

    Low: 51 °F

    Partly Cloudy
    then Chance
    Showers

Detailed Forecast

Overnight
Showers likely. Cloudy, with a low around 57. Northeast wind around 5 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Columbus Day
A chance of showers before 8am. Patchy fog between 10am and 1pm. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 74. North wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Monday Night
Partly cloudy, with a low around 54. Calm wind.
Tuesday
Mostly cloudy, then gradually becoming sunny, with a high near 76. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 62. Southwest wind around 5 mph.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Mostly cloudy, with a low around 55.
Thursday
Mostly sunny, with a high near 68.
Thursday Night
A chance of showers after 2am. Partly cloudy, with a low around 51. Chance of precipitation is 40%.
Friday
Showers likely, mainly after 8am. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 47. Chance of precipitation is 30%.
Saturday
Partly sunny, with a high near 55.
Saturday Night
Partly cloudy, with a low around 36.
Sunday
Sunny, with a high near 54.
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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:
9:22 pm EDT Oct 11, 2026
Forecast Valid:
12am EDT Oct 12, 2026-6pm EDT Oct 18, 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