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.

Mostly Cloudy

56°F

13°C

Humidity 84%
Wind Speed E 7 mph
Barometer 30.05 in (1016.9 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 18 Apr 8:53 am EDT
Extended Forecast for

Princeton Junction NJ

  • Today

    Today: Mostly sunny, with a high near 67. East wind 5 to 10 mph.

    High: 67 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of showers after 1am. Mostly cloudy, with a low around 51. Southeast wind 5 to 10 mph becoming light east after midnight. Chance of precipitation is 20%.

    Low: 51 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: Showers, mainly between 8am and 2pm. High near 57. Northwest wind 5 to 15 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 57 °F

    Showers

  • Sunday Night

    Sunday Night: A chance of showers before 8pm. Partly cloudy, with a low around 38. West wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 38 °F

    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 53. Northwest wind 10 to 15 mph.

    High: 53 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Patchy frost after 1am. Otherwise, mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear
    then Patchy
    Frost

  • Tuesday

    Tuesday: Areas of frost before 9am. Otherwise, sunny, with a high near 56.

    High: 56 °F

    Areas Frost
    then Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 67.

    High: 67 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 67. East wind 5 to 10 mph.
Tonight
A slight chance of showers after 1am. Mostly cloudy, with a low around 51. Southeast wind 5 to 10 mph becoming light east after midnight. Chance of precipitation is 20%.
Sunday
Showers, mainly between 8am and 2pm. High near 57. Northwest wind 5 to 15 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A chance of showers before 8pm. Partly cloudy, with a low around 38. West wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Mostly sunny, with a high near 53. Northwest wind 10 to 15 mph.
Monday Night
Patchy frost after 1am. Otherwise, mostly clear, with a low around 30.
Tuesday
Areas of frost before 9am. Otherwise, sunny, with a high near 56.
Tuesday Night
Partly cloudy, with a low around 41.
Wednesday
Mostly sunny, with a high near 67.
Wednesday Night
Mostly clear, with a low around 43.
Thursday
Sunny, with a high near 71.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Mostly sunny, with a high near 73.
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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 18, 2026
Forecast Valid:
9am EDT Apr 18, 2026-6pm EDT Apr 24, 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