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

31°F

-1°C

Humidity 89%
Wind Speed Calm
Barometer 29.80 in (1008.6 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 14 Mar 2:53 am EDT
Extended Forecast for

Princeton Junction NJ

  • Overnight

    Overnight: Mostly clear, with a low around 38. Southwest wind around 10 mph, with gusts as high as 25 mph.

    Low: 38 °F

    Mostly Clear

  • Saturday

    Saturday: 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

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 34. Northwest wind around 5 mph becoming calm after midnight.

    Low: 34 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Cloudy, with a high near 51. Southeast wind 5 to 15 mph.

    High: 51 °F

    Cloudy

  • Sunday Night

    Sunday Night: Rain, mainly after 2am. Low around 43. Southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 43 °F

    Chance Rain
    then Rain

  • Monday

    Monday: Showers, with thunderstorms also possible after 11am. High near 66. Breezy. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 66 °F

    Showers and
    Breezy

  • Monday Night

    Monday Night: Rain showers before 2am, then a chance of rain and snow showers. Some thunder is also possible. Low around 33. Breezy. Chance of precipitation is 90%.

    Low: 33 °F

    Breezy.
    Showers then
    Rain/Snow

  • Tuesday

    Tuesday: A chance of rain and snow showers before 8am. Partly sunny, with a high near 41. Chance of precipitation is 30%.

    High: 41 °F

    Chance
    Rain/Snow
    then Partly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 38. Southwest wind around 10 mph, with gusts as high as 25 mph.
Saturday
Sunny, with a high near 52. Breezy, with a west wind 15 to 20 mph, with gusts as high as 40 mph.
Saturday Night
Increasing clouds, with a low around 34. Northwest wind around 5 mph becoming calm after midnight.
Sunday
Cloudy, with a high near 51. Southeast wind 5 to 15 mph.
Sunday Night
Rain, mainly after 2am. Low around 43. Southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Showers, with thunderstorms also possible after 11am. High near 66. Breezy. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night
Rain showers before 2am, then a chance of rain and snow showers. Some thunder is also possible. Low around 33. Breezy. Chance of precipitation is 90%.
Tuesday
A chance of rain and snow showers before 8am. Partly sunny, with a high near 41. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 22.
Wednesday
Partly sunny, with a high near 40.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
Mostly cloudy, with a high near 49.
Thursday Night
Mostly cloudy, with a low around 33.
Friday
Cloudy, with a high near 51.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Princeton Junction NJ
 40.3°N 74.62°W (Elev. 98 ft)
Last Update:
9:46 pm EDT Mar 13, 2026
Forecast Valid:
3am 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