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

55°F

13°C

Humidity 40%
Wind Speed Vrbl 7 mph
Barometer 30.48 in (1031.6 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 12 Apr 11:53 am EDT
Extended Forecast for

Princeton Junction NJ

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 63. South wind 5 to 10 mph.

    High: 63 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 47. South wind around 5 mph.

    Low: 47 °F

    Partly Cloudy

  • Monday

    Monday: A slight chance of showers after 2pm. Partly sunny, with a high near 79. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    High: 79 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 58. West wind around 5 mph.

    Low: 58 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 85. Light southwest wind increasing to 5 to 10 mph in the morning.

    High: 85 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 88.

    High: 88 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 63. South wind 5 to 10 mph.
Tonight
Partly cloudy, with a low around 47. South wind around 5 mph.
Monday
A slight chance of showers after 2pm. Partly sunny, with a high near 79. Southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 58. West wind around 5 mph.
Tuesday
Mostly sunny, with a high near 85. Light southwest wind increasing to 5 to 10 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 63.
Wednesday
Mostly sunny, with a high near 89.
Wednesday Night
A chance of showers between 8pm and 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.
Thursday
Partly sunny, with a high near 88.
Thursday Night
Mostly cloudy, with a low around 62.
Friday
Mostly sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 57.
Saturday
Mostly sunny, with a high near 82.
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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 EDT Apr 12, 2026
Forecast Valid:
12pm EDT Apr 12, 2026-6pm EDT Apr 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