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

29°F

-2°C

Humidity 92%
Wind Speed NW 7 mph
Barometer 29.80 in (1008.6 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 14 Mar 4:53 am EDT
Extended Forecast for

Princeton Junction NJ

  • Today

    Today: Sunny, with a high near 52. Breezy, with a west wind 15 to 20 mph, with gusts as high as 40 mph.

    High: 52 °F

    Sunny and
    Breezy

  • Tonight

    Tonight: Increasing clouds, with a low around 33. Northwest wind around 5 mph becoming calm in the evening.

    Low: 33 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 52. Southeast wind 5 to 15 mph.

    High: 52 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A chance of rain before 2am, then showers after 2am. Low around 44. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 44 °F

    Chance Rain
    then Showers

  • Monday

    Monday: Showers, with thunderstorms also possible after 11am. High near 67. Breezy, with a south wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 67 °F

    Showers and
    Breezy

  • Monday Night

    Monday Night: Rain showers before 5am, then a chance of rain and snow showers. Some thunder is also possible. Low around 32. Breezy. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 32 °F

    Showers and
    Breezy then
    Rain/Snow

  • Tuesday

    Tuesday: A chance of snow before 8am. Mostly sunny, with a high near 40. Chance of precipitation is 30%.

    High: 40 °F

    Chance Snow
    then Partly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 52. Breezy, with a west wind 15 to 20 mph, with gusts as high as 40 mph.
Tonight
Increasing clouds, with a low around 33. Northwest wind around 5 mph becoming calm in the evening.
Sunday
Mostly cloudy, with a high near 52. Southeast wind 5 to 15 mph.
Sunday Night
A chance of rain before 2am, then showers after 2am. Low around 44. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Showers, with thunderstorms also possible after 11am. High near 67. Breezy, with a south wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
Rain showers before 5am, then a chance of rain and snow showers. Some thunder is also possible. Low around 32. Breezy. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Tuesday
A chance of snow before 8am. Mostly sunny, with a high near 40. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 23.
Wednesday
Mostly sunny, with a high near 42.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
Partly sunny, with a high near 49.
Thursday Night
Partly cloudy, with a low around 32.
Friday
Mostly sunny, with a high near 53.
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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:
4:12 am EDT Mar 14, 2026
Forecast Valid:
5am EDT Mar 14, 2026-6pm EDT Mar 20, 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