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

33°F

1°C

Humidity 61%
Wind Speed SW 6 mph
Barometer 30.18 in (1021.5 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 13 Mar 8:53 am EDT
Extended Forecast for

Princeton Junction NJ

  • Today

    Today: Partly sunny, with a high near 49. Light south wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 30 mph.

    High: 49 °F

    Partly Sunny

  • Tonight

    Tonight: A slight chance of rain between 10pm and 11pm. Partly cloudy, with a low around 38. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 38 °F

    Slight Chance
    Rain then
    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 53. Breezy, with a west wind 15 to 20 mph, with gusts as high as 35 mph.

    High: 53 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 34. West wind around 5 mph becoming calm in the evening.

    Low: 34 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 52. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 52 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A chance of showers before 2am, then showers and possibly a thunderstorm between 2am and 5am, then showers after 5am. Low around 43. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 43 °F

    Chance
    Showers then
    Showers

  • Monday

    Monday: Showers, with thunderstorms also possible after 2pm. High near 67. Breezy. Chance of precipitation is 90%.

    High: 67 °F

    Showers and
    Breezy

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Low around 35. Breezy. Chance of precipitation is 80%.

    Low: 35 °F

    Showers and
    Breezy

  • Tuesday

    Tuesday: A chance of showers before 8am. Partly sunny, with a high near 45. Chance of precipitation is 30%.

    High: 45 °F

    Chance
    Showers then
    Partly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 49. Light south wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 30 mph.
Tonight
A slight chance of rain between 10pm and 11pm. Partly cloudy, with a low around 38. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 53. Breezy, with a west wind 15 to 20 mph, with gusts as high as 35 mph.
Saturday Night
Increasing clouds, with a low around 34. West wind around 5 mph becoming calm in the evening.
Sunday
Mostly cloudy, with a high near 52. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday Night
A chance of showers before 2am, then showers and possibly a thunderstorm between 2am and 5am, then showers after 5am. Low around 43. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
Showers, with thunderstorms also possible after 2pm. High near 67. Breezy. Chance of precipitation is 90%.
Monday Night
Showers and possibly a thunderstorm. Low around 35. Breezy. Chance of precipitation is 80%.
Tuesday
A chance of showers before 8am. Partly sunny, with a high near 45. Chance of precipitation is 30%.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Sunny, with a high near 41.
Wednesday Night
Mostly cloudy, with a low around 27.
Thursday
Mostly cloudy, with a high near 48.
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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:
4:11 am EDT Mar 13, 2026
Forecast Valid:
9am EDT Mar 13, 2026-6pm EDT Mar 19, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation